13A - Многоточечный впрыск топлива (MPI)

13A - Многоточечный впрыск топлива (MPI)
13A-1
GROUP 13A
MULTIPOINT FUEL
INJECTION (MPI)
CONTENTS
GENERAL INFORMATION . . . . . . . .
13A-5
Code No. P0112: Intake Air Temperature Sensor Circuit
Low Input . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-39
SERVICE SPECIFICATION(S) . . . . .
13A-10
Code No. P0113: Intake Air Temperature Sensor Circuit
High Input . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-40
SEALANT(S) OR ADHESIVE(S) . . . . 13A-10
Code No. P0117: Engine Coolant Temperature Sensor
Circuit Low Input . . . . . . . . . . . . . . . . . . . . . 13A-41
SPECIAL TOOLS. . . . . . . . . . . . . . . .
13A-11
Code No. P0118: Engine Coolant Temperature Sensor
Circuit High Input . . . . . . . . . . . . . . . . . . . . . 13A-42
TROUBLESHOOTING . . . . . . . . . . . .
13A-14
Code No. P0121: Trustful Check Throttle Position
Sensor (main) . . . . . . . . . . . . . . . . . . . . . . . 13A-44
DIAGNOSIS TROUBLESHOOTING FLOW
13A-14
DIAGNOSIS FUNCTION. . . . . . . . . . . . . . .
13A-14
Code No. P0122: Throttle Position Sensor (main)
Circuit Low Input . . . . . . . . . . . . . . . . . . . . . 13A-45
INSPECTION CHART FOR DIAGNOSIS CODE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-23
Code No. P0123: Throttle Position Sensor (main)
Circuit High Input . . . . . . . . . . . . . . . . . . . . . 13A-46
DIAGNOSIS CODE PROCEDURES . . . . .
Code No. P0125: Insufficient Coolant Temperature for
Closed Loop Fuel Control . . . . . . . . . . . . . . 13A-47
13A-25
Code No. P0010: Inlet Oil Feeder Control Valve System
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-25
Code No. P0011: Inlet Variable Valve Timing System
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-27
Code No. P0031: Oxygen Sensor (front) Heater Circuit
Low Input . . . . . . . . . . . . . . . . . . . . . . . . . .
13A-28
Code No. P0032: Oxygen Sensor (front) Heater Circuit
High Input . . . . . . . . . . . . . . . . . . . . . . . . . .
13A-29
Code No. P0037: Oxygen Sensor (rear) Heater Circuit
Low Input . . . . . . . . . . . . . . . . . . . . . . . . . .
13A-30
Code No. P0038: Oxygen Sensor (rear) Heater Circuit
High Input . . . . . . . . . . . . . . . . . . . . . . . . . .
13A-32
Code No. P0068: Trustful Check Air Flow Sensor
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-32
Code No. P0102: Air Flow Sensor Circuit Low Input
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-33
Code No. P0103: Air Flow Sensor Circuit High Input
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-35
Code No. P0107: Manifold Absolute Pressure Sensor
Circuit Low Input . . . . . . . . . . . . . . . . . . . . .
13A-36
Code No. P0108: Manifold Absolute Pressure Sensor
Circuit High Input. . . . . . . . . . . . . . . . . . . . .
13A-37
Code No. P0131: Oxygen Sensor (front) Circuit Low
Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-49
Code No. P0132: Oxygen Sensor (front) Circuit High
Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-50
Code No. P0133: Oxygen Sensor (front) Circuit Slow
Response . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-51
Code No. P0134: Oxygen Sensor (front) Circuit No
Activity Detected . . . . . . . . . . . . . . . . . . . . . 13A-52
Code No. P0137: Oxygen Sensor (rear) Circuit Low
Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-54
Code No. P0138: Oxygen Sensor (rear) Circuit High
Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-55
Code No. P0171: Abnormal Fuel System (lean)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-56
Code No. P0172: Abnormal Fuel System (rich)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-58
Code No. P0221: Trustful Check Throttle Position
Sensor (sub) . . . . . . . . . . . . . . . . . . . . . . . . 13A-59
Code No. P0222: Throttle Position Sensor (sub) Circuit
Low Input . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-60
Code No. P0223: Throttle Position Sensor (sub) Circuit
13A-2
High Input . . . . . . . . . . . . . . . . . . . . . . . . . .
13A-61
Code No. P061F: Fail-safe Control System
13A-91
Code No. P0261: No. 1 Injector Circuit Low Input
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-62
Code No. P0622: Alternator FR Terminal System
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-91
Code No. P0262: No. 1 Injector Circuit High Input
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-63
Code No. P062F: EEPROM Malfunction . . .
Code No. P0264: No. 2 Injector Circuit Low Input
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-64
Code No. P0265: No. 2 Injector Circuit High Input
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-65
Code No. P0267: No. 3 Injector Circuit Low Input
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-66
Code No. P0268: No. 3 Injector Circuit High Input
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-67
Code No. P0270: No. 4 Injector Circuit Low Input
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-68
Code No. P0271: No. 4 Injector Circuit High Input
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-69
Code No. P0300: Random/Multiple Cylinder Misfire
Detected . . . . . . . . . . . . . . . . . . . . . . . . . . .
13A-70
Code No. P0301: No. 1 Cylinder Misfire Detected
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-72
Code No. P0302: No. 2 Cylinder Misfire Detected
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-73
13A-92
Code No. P0630: Chassis Number not Programmed
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-93
Code No. P0638: Throttle Valve Control Servo Circuit
Range/Performance Problem . . . . . . . . . . . 13A-93
Code No. P0642: Throttle Position Sensor Power
Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-94
Code No. P0657: Throttle Valve Control Servo Relay
Circuit Malfunction . . . . . . . . . . . . . . . . . . . . 13A-94
Code No. P1231: Trustful Check Active Stability Control
(ASC) <Vehicles with ASC> . . . . . . . . . . . . 13A-96
Code No. P1238: Air Flow Sensor Trustful For Torque
Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-97
Code No. P1240: Trustful Check Ignition Angle
<Vehicles with ASC> . . . . . . . . . . . . . . . . . . 13A-97
Code No. P1242: Fail-safe Control Monitoring
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-98
Code No. P1243: Inquiry/Response Error . .
13A-98
Code No. P1247: Trustful Check CVT. . . . .
13A-99
Code No. P0303: No. 3 Cylinder Misfire Detected
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-74
Code No. P1590: CVT-ECU to Engine-ECU
Communication Error in Torque Reduction Request
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-99
Code No. P0304: No. 4 Cylinder Misfire Detected
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-75
Code No. P1603: Battery Backup Circuit Malfunction
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-100
Code No. P0327: Detonation Sensor Circuit Low Input
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-77
Code No. P2100: Throttle Valve Control Servo Circuit
(open) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-100
Code No. P0328: Detonation Sensor Circuit High Input
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-78
Code No. P2101: Throttle Valve Control Servo Magneto
Malfunction . . . . . . . . . . . . . . . . . . . . . . . . . 13A-102
Code No. P0335: Crank Angle Sensor System
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-78
Code No. P2122: Accelerator Pedal Position Sensor
(main) Circuit Low Input. . . . . . . . . . . . . . . . 13A-102
Code No. P0340: Inlet Camshaft Position Sensor
System . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13A-80
Code No. P2123: Accelerator Pedal Position Sensor
(main) Circuit High Input . . . . . . . . . . . . . . . 13A-104
Code No. P0421: Catalyst Malfunction . . . .
Code No. P2127: Accelerator Pedal Position Sensor
(sub) Circuit Low Input. . . . . . . . . . . . . . . . . 13A-105
13A-82
Code No. P0458: Purge Control Solenoid Valve Circuit
Low Input . . . . . . . . . . . . . . . . . . . . . . . . . .
13A-83
Code No. P0459: Purge Control Solenoid Valve Circuit
High Input . . . . . . . . . . . . . . . . . . . . . . . . . .
13A-84
Code No. P0513: Immobilizer Malfunction .
13A-85
Code No. P0602: Variant Coding System. .
13A-86
Code No. P0604: RAM Error. . . . . . . . . . . .
13A-87
Code No. P0606: Engine-ECU main processor
malfunction . . . . . . . . . . . . . . . . . . . . . . . . .
13A-87
Code No. P060B: A/D Converter . . . . . . . .
13A-88
Code No. P060D: Trustful Check Accelerator Pedal
Position Sensor . . . . . . . . . . . . . . . . . . . . . .
13A-89
Code No. P061A: Torque Monitoring . . . . .
13A-89
Code No. P061C: Trustful Check Engine Speed
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-90
Code No. P2128: Accelerator Pedal Position Sensor
(sub) Circuit High Input . . . . . . . . . . . . . . . . 13A-106
Code No. P2135: Throttle Position Sensor (main and
sub) Range/Performance Problem . . . . . . . 13A-107
Code No. P2138: Accelerator Pedal Position Sensor
(main and sub) Range/Performance Problem
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-108
Code No. P2228: Barometric Pressure Sensor Circuit
Low Input . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-110
Code No. P2229: Barometric Pressure Sensor Circuit
High Input . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-110
Code No. P2252: Oxygen Sensor Offset Circuit Low
Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-111
Code No. P2253: Oxygen Sensor Offset Circuit High
Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-112
13A-3
Code No. P2530: Ignition Switch-IG1 Circuit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-113
Code No. U0101: CVT-ECU Time-out . . . . 13A-114
Code No. U0121: ABS-ECU <Vehicles with ABS> or
ASC-ECU <Vehicles with ASC> Time-out . 13A-116
Code No. U0131: EPS-ECU Time-out . . . . 13A-117
Code No. U0141: ETACS-ECU Time-out . . 13A-119
Code No. U0167: KOS-ECU Communication Error
<Vehicles with KOS> . . . . . . . . . . . . . . . . . 13A-120
Code No. U0415: ASC-ECU CAN Data Abnormality
<Vehicles with ASC>. . . . . . . . . . . . . . . . . . 13A-121
INSPECTION CHART FOR TROUBLE SYMPTOMS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-123
SYMPTOM PROCEDURES . . . . . . . . . . . . 13A-126
Inspection Procedure 1: The Communication Between
M.U.T.-III and Engine-ECU is Not Possible 13A-126
Inspection Procedure 2: The Engine Warning Lamp
Does Not Illuminate Right after the Ignition Switch is
Turned to the "ON" Position . . . . . . . . . . . . 13A-127
Inspection Procedure 18: Overheating . . . . 13A-146
Inspection Procedure 19: Engine-ECU Power Supply,
Engine Control Relay, Ignition Switch-IG1 System
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-147
Inspection Procedure 20: Fuel Pump System
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-149
Inspection Procedure 21: A/C Compressor Relay
System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-151
Inspection Procedure 22: Ignition Circuit System
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-152
Inspection Procedure 23: Engine Oil Pressure Switch
System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-154
Inspection Procedure 24: In Running, The ECO Mode
Indicator Shows Nothing . . . . . . . . . . . . . . . 13A-155
DATA LIST REFERENCE TABLE . . . . . . . . 13A-155
ACTUATOR TEST REFERENCE TABLE . . 13A-168
CHECK AT THE ECU TERMINALS . . . . . . 13A-168
INSPECTION PROCEDURE USING AN
OSCILLOSCOPE . . . . . . . . . . . . . . . . . . . . 13A-174
Inspection Procedure 3: The Engine Warning Lamp
Remains Illuminating and Never Goes Out. 13A-128
ON-VEHICLE SERVICE . . . . . . . . . . . 13A-179
Inspection Procedure 4: Starting Impossible (starter not
operative) . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-128
THROTTLE BODY (THROTTLE VALVE AREA)
CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . 13A-179
Inspection Procedure 5: Starting Impossible (starter
operative but no initial combustion). . . . . . . 13A-132
FUEL PRESSURE TEST . . . . . . . . . . . . . . 13A-179
Inspection Procedure 6: Starting Impossible (initial
combustion but no complete combustion), Improper
Starting (long time to start) . . . . . . . . . . . . . 13A-133
Inspection Procedure 7: Unstable Idling (rough idling,
hunting), Improper Idling Speed (too high or too low),
Engine Stalls during Idling (die out) . . . . . . 13A-135
Inspection Procedure 8: The Engine Stalls when
Starting the Car (pass out), The Engine Stalls when
Decelerating . . . . . . . . . . . . . . . . . . . . . . . . 13A-137
REDUCE PRESSURIZED FUEL LINES . . . 13A-181
FUEL PUMP OPERATION CHECK . . . . . . 13A-182
COMPONENT LOCATION . . . . . . . . . . . . . 13A-182
ENGINE CONTROL RELAY CONTINUITY CHECK
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-184
FUEL PUMP RELAY CONTINUITY CHECK
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-184
THROTTLE VALVE CONTROL SERVO RELAY
CONTINUITY CHECK . . . . . . . . . . . . . . . . . 13A-185
Inspection Procedure 9: Engine Does Not Revolve Up
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-137
INTAKE AIR TEMPERATURE SENSOR CHECK
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-185
Inspection Procedure 10: Hesitation, Sag, Poor
Acceleration, Stumble or Surge . . . . . . . . . 13A-138
ENGINE COOLANT TEMPERATURE SENSOR
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-186
Inspection Procedure 11: The Feeling of Impact or
Vibration when Accelerating . . . . . . . . . . . . 13A-140
OXYGEN SENSOR CHECK . . . . . . . . . . . . 13A-186
Inspection Procedure 12: The Feeling of Impact or
Vibration when Decelerating . . . . . . . . . . . . 13A-141
THROTTLE VALVE CONTROL SERVO CHECK
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-189
Inspection Procedure 13: Knocking . . . . . . 13A-141
OIL FEEDER CONTROL VALVE CHECK. . 13A-190
Inspection Procedure 14: Ignition Timing Deviation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-142
INJECTOR . . . . . . . . . . . . . . . . . . . . . 13A-191
INJECTOR CHECK . . . . . . . . . . . . . . . . . . . 13A-188
Inspection Procedure 15: Run On (Dieseling)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-143
REMOVAL AND INSTALLATION . . . . . . . . 13A-191
Inspection Procedure 16: Odour, White Smoke, Black
Smoke and High-concentration of CO/HC during Idling
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-143
THROTTLE BODY ASSEMBLY . . . . . 13A-195
Inspection Procedure 17: Battery Run Down
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-145
REMOVAL AND INSTALLATION . . . . . . . . 13A-195
ENGINE-ECU . . . . . . . . . . . . . . . . . . . 13A-197
13A-4
REMOVAL AND INSTALLATION . . . . . . . . 13A-197
MULTIPOINT FUEL INJECTION (MPI)
GENERAL INFORMATION
13A-5
GENERAL INFORMATION
M1131000106680
The Multipoint Fuel Injection System consists of sensors which detect the engine conditions, the
engine-ECU which controls the system based on signals from these sensors, and actuators which operate under the control of the engine-ECU. The
engine-ECU carries out activities such as fuel injection control, idle speed control and ignition timing
control. In addition, the engine-ECU is equipped with
several diagnosis modes which simplify troubleshooting when a problem develops.
FUEL INJECTION CONTROL
The injector drive times and injection timing are controlled so that the optimum air/fuel mixture is supplied to the engine to correspond to the
continually-changing engine operation conditions.
A single injector is mounted at the intake port of each
cylinder. Fuel is sent under pressure from the fuel
tank by the fuel pump, with the pressure being regulated by the fuel pressure regulator. The fuel thus
regulated is distributed to each of the injectors.
Fuel injection is normally carried out once for each
cylinder for every two rotations of the crankshaft. The
firing order is 1-3-4-2. This is called sequential fuel
injection. The engine-ECU provides a richer air/fuel
mixture by carrying out "open-loop" control when the
engine is cold or operating under high load conditions in order to maintain engine performance. In
addition, when the engine is warm or operating under
normal conditions, the engine-ECU controls the
air/fuel mixture by using the oxygen sensor signal to
carry out "closed-loop" control in order to obtain the
theoretical air/fuel mixture ratio that provides the
maximum cleaning performance from the three way
catalyst.
THROTTLE VALVE OPENING CONTROL
This system electronically controls the opening of the
throttle valve. The engine-ECU detects the amount
of travel of the accelerator pedal via the accelerator
pedal position sensor, and controls the actuation of
the throttle valve control servo, which is mounted on
the throttle body, in order to attain the target throttle
valve opening that has been predetermined in
accordance with driving conditions.
IDLE SPEED CONTROL
The idle speed is kept at the optimum speed by controlling the amount of air that passes through the
throttle valve in accordance with changes in idling
conditions and engine load during idling.
IGNITION TIMING CONTROL
The power transistor located in the ignition primary
circuit turns ON and OFF to control the primary current flow to the ignition coil. This controls the ignition
timing in order to provide the optimum ignition timing
with respect to the engine operating conditions. The
ignition timing is determined by the engine-ECU from
the engine speed, intake air volume, engine coolant
temperature and atmospheric pressure.
The engine-ECU drives the throttle valve control
servo to keep the engine running at the pre-set idle
target speed in accordance with the engine coolant
temperature and A/C and other electrical load. In
addition, when the A/C switch is turned off and on
while the engine is idling, the throttle valve control
servo adjusts the throttle valve passes through air
amount according to the engine load conditions to
avoid fluctuations in the engine speed.
MULTIPOINT FUEL INJECTION (MPI)
13A-6
GENERAL INFORMATION
SELF-DIAGNOSIS FUNCTION
• When an abnormality is detected in one of the
sensors or actuators related to emission control,
the engine warning lamp (check engine lamp)
illuminates as a warning to the driver.
• When an abnormality is detected in one of the
sensors or actuators, a diagnosis code corresponding to the abnormality is set.
• The RAM data inside the engine-ECU that is
related to the sensors and actuators can be read
by means of the M.U.T.-III. In addition, the actuators can be force-driven under certain circumstances.
OTHER CONTROL FUNCTIONS
1. Fuel Pump Control
Turns the fuel pump relay ON so that current is supplied to the fuel pump while the engine is cranking or running.
2. A/C Relay Control
Turns the compressor clutch of the A/C ON and OFF.
3. Oil Feeder Control Valve Control
The engine-ECU carries out the duty control of the oil
feeder control valve according to the operation
condition. This varies the phase angle of the
camshaft to optimize the valve timing.
4. Alternator Output Current Control
Prevents alternator output current from increasing
suddenly and idle speed from dropping at times
such as when the headlamp are turned on.
5. Purge Control Solenoid Valve Control
[Refer to GROUP 17 − Emission Control − Evaporative Emission Control System − General Information (Evaporative Emission Control System) ].
GENERAL SPECIFICATIONS
Items
Specifications
Throttle body Throttle bore mm
57
Throttle position sensor
Hall element type
Throttle valve control servo
DC motor type, having brushes
Engine-ECU
Identification No.
E6T79771 <4B11>
E6T79871 <4B12>
Sensors
Air flow sensor
Heat sensitizing type
Barometric pressure sensor
Semiconductor type
Intake air temperature sensor
Thermistor type
Engine coolant temperature sensor
Thermistor type
Oxygen sensor
Zirconia type
Accelerator pedal position sensor
Hall element type
Inlet camshaft position sensor
Magneto resistance element type
Crank angle sensor
Magneto resistance element type
Detonation sensor
Piezoelectric type
Manifold absolute pressure sensor
Semiconductor type
MULTIPOINT FUEL INJECTION (MPI)
GENERAL INFORMATION
Items
Actuators
Specifications
Engine control relay
Contact switch type
Fuel pump relay
Contact switch type
A/C compressor relay
Contact switch type
Starter relay
Contact switch type
Injector relay
Contact switch type
Injector type and number
Electromagnetic type, 4
Injector identification mark
KME 340C
Throttle valve control servo relay
Contact switch type
Inlet oil feeder control valve
Duty cycle type solenoid valve
Purge control solenoid valve
Duty cycle type solenoid valve
Fuel pressure Regulator pressure kPa
regulator
324
13A-7
MULTIPOINT FUEL INJECTION (MPI)
13A-8
GENERAL INFORMATION
1 Air flow sensor
2 Intake air temperature
sensor
3 Throttle position sensor
(main)
4 Throttle position sensor
(sub)
5 Manifold absolute
pressure sensor
6 Inlet camshaft position
sensor
7 Engine coolant
temperature sensor
8 Detonation sensor
9 Crank angle sensor
10 Oxygen sensor (front)
11 Oxygen sensor (rear)
Power supply
Ignition switch-IG
Ignition switch-ST
Accelerator pedal
position
sensor (main)
Accelerator pedal
position
sensor (sub)
Engine oil pressure
switch
Alternator FR terminal
Alternator L terminal
CAN communication
(input signal)
EngineECU
Barometric
pressure
sensor
4 Purge control solenoid valve
1 Injector
2 Inlet oil feeder
control valve
3 Throttle valve control
servo
4 Purge control solenoid
valve
Ignition coil
Engine control relay
Fuel pump relay
Starter relay
Throttle valve control
servo relay
A/C compressor relay
Alternator G terminal
Oxygen sensor (front)
heater
Oxygen sensor (rear)
heater
CAN communication
(input signal)
3 Throttle position sensor (main)
4 Throttle position sensor (sub)
3 Throttle valve control servo
Canister
5 Manifold absolute pressure
sensor
Air
2 Inlet oil feeder control valve
1 Air flow sensor
2 Intake air
temperature
sensor
6 Inlet camshaft
position sensor
From fuel pump
1 Injector
7 Engine coolant
temperature sensor
Catalytic
converter
8 Detonation sensor
9 Crank angle sensor
Catalytic
converter
11 Oxygen sensor (rear)
10 Oxygen sensor (front)
AKB00748AB
BRAKE OVERRIDE CONTROL
A brake override control has been installed. This
enables the brake to override the accelerator if the
accelerator pedal and the brake pedal are depressed
simultaneously during driving.
MULTIPOINT FUEL INJECTION (MPI)
GENERAL INFORMATION
13A-9
System schematic diagram
Accelerator pedal position sensor (APS)
Engine control module
Brake pedal (Stop lamp switch)
CAN input (ETACS-ECU)
ETACS-ECU
Control by substituting
lower value for actual
accelerator opening angle.
Vehicle speed
Throttle valve
opening angle will
be reduced
CAN input (CVT)
CVT-ECU
Direct input (M/T)
ACB00255 AB
Operation condition
Control will be activated when all of the following
conditions are satisfied.
• Voltage at the accelerator pedal position sensor
(APS main) is 1.3 V or more, and the stop lamp
switch remains on
• Vehicle speed is 5 km/h or more
Control will be deactivated when any of the following
conditions is satisfied.
• Voltage at the accelerator pedal position sensor
(APS main) is less than 1.3 V
• The stop lamp switch remains off
MULTIPOINT FUEL INJECTION (MPI)
13A-10
SERVICE SPECIFICATION(S)
SERVICE SPECIFICATION(S)
M1131000303306
Item
Specifications
Intake air temperature sensor
resistance kΩ
Engine coolant temperature
sensor resistance kΩ
at −20°C
13 − 18
at 0 °C
5.3 − 6.7
at 20 °C
2.3 − 3.0
at 80 °C
0.30 − 0.45
at −20°C
14 − 17
at 0 °C
5.1 − 6.5
at 20 °C
2.1 − 2.7
at 40 °C
0.9 − 1.3
at 60 °C
0.48 − 0.68
at 80 °C
0.26 − 0.36
Fuel pressure kPa
Approximately 324
Injector coil resistance (at 20°C) Ω
10.5 − 13.5
Oxygen sensor output voltage (during racing) V
0.6 − 1.0
Oxygen sensor heater resistance (at 20°C) Ω
4.5 − 8.0
Throttle valve control servo coil resistance (at 20°C) Ω
0.3 − 80
Inlet oil feeder control valve resistance (at 20°C) Ω
6.9 − 7.9
SEALANT(S) OR ADHESIVE(S)
M1131000501962
Points of application
Specified sealant
Engine coolant temperature sensor threaded
portion
LOCTITE 262, Three bond 1324N or equivalent
MULTIPOINT FUEL INJECTION (MPI)
13A-11
SPECIAL TOOLS
SPECIAL TOOLS
M1131000604195
Tool
a
MB992744
b
MB992745
c
DO NOT USE
MB992746
d
MB992747
e
MB992748
ACB05421AB
Number
Name
Use
a. MB992744
b. MB992745
c. MB992746
d. MB992747
e. MB992748
a. Vehicle communication
interface-Lite
(V.C.I.-Lite)
b. V.C.I.-Lite main
harness A (for vehicles
with CAN
communication)
c. V.C.I.-Lite main
harness B (for vehicles
without CAN
communication)
d. V.C.I.-Lite USB cable
short
e. V.C.I.-Lite USB cable
long
• MPI system inspection
MULTIPOINT FUEL INJECTION (MPI)
13A-12
SPECIAL TOOLS
Tool
a
MB991824
b
Number
Name
Use
MB991955
a: MB991824
b: MB991827
c: MB991910
d: MB991911
e: MB991825
f: MB991826
M.U.T.-III sub assembly
a: Vehicle communication
interface (V.C.I.)
b: USB cable
c: M.U.T.-III main harness
A (Vehicles with CAN
communication system)
d: M.U.T.-III main harness
B (Vehicles without
CAN communication
system)
e: Adapter for
measurement
f: Trigger harness
• MPI system inspection
• Fuel pressure test
MB992110
Power plant ECU check
harness
• Measurement of voltage
during troubleshooting
• Measure engine-ECU
terminal voltage.
• Inspection using an
oscilloscope
MB991709
Test harness
• Measurement of voltage
during troubleshooting
• Inspection using an
oscilloscope
MB991827
c
CAUTION
For vehicle with CAN
communication, use
M.U.T.-III main harness A to
send simulated vehicle
speed. If you connect
M.U.T.-III main harness B
instead, the CAN
communication does not
function correctly.
MB991910
d
DO NOT USE
MB991911
e
MB991825
f
MB991826
MB991955
MB992110
MULTIPOINT FUEL INJECTION (MPI)
13A-13
SPECIAL TOOLS
Tool
Number
Name
Use
MB991658
Test harness
• Measurement of voltage
during troubleshooting
• Inspection using an
oscilloscope
• Oxygen sensor check
MB992001
Hose adaptor
• Measure fuel pressure
• Check the spray condition
of injectors
MB992076
Injector test set
MD998709
Adapter hose
MB992049
Quick connector
MB991981
Fuel pressure gauge set
MB992042
Engine coolant
temperature sensor
wrench
MB991658
MB992001
MB992076
Measure fuel pressure
MB992049
MB991981
MB992042
Removal and installation of the
engine coolant temperature
sensor.
MULTIPOINT FUEL INJECTION (MPI)
13A-14
TROUBLESHOOTING
Tool
Number
Name
Use
MB992184
Injector holder
Check the spray condition of
injectors
MB992088
Injector test nipple
MB991607
Injector test harness
MB992106
O-ring installer
MB992184
MB992088
MB991607
Installation of O-ring on fuel
injector injection nozzle side
B992106
TROUBLESHOOTING
DIAGNOSIS TROUBLESHOOTING FLOW
M1131150002616
Refer to GROUP 00 − How to Use Troubleshooting/Inspection Service Points − Contents of Troubleshooting .
DIAGNOSIS FUNCTION
M1131155504935
ENGINE WARNING LAMP (CHECK
ENGINE LAMP)
Engine warning lamp
(check engine lamp)
AKC00024AB
When the abnormal condition occurs with respect to
the items of Multipoint Fuel Injection (MPI) system
shown in the table, the engine warning lamp will illuminate or flash. When the lamp remains illuminated
after the engine start, or when the lamp is illuminated
while the engine is running, check the diagnosis
code output. There are two methods for checking the
indicator lamp burn out: When the ignition switch is in
"ON" position, the indicator lamp is illuminated, and
then extinguished few seconds later. When the ignition switch is in "ON" position and the engine starts,
the indicator lamp is extinguished.
NOTE: When the CVT-ECU detects malfunctions
related to the CVT, the engine warning lamp is also
illuminated.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
ENGINE WARNING LAMP INSPECTION ITEMS
CAUTION
The engine warning lamp continuously illuminates when the engine-ECU malfunctions.
P0010
Inlet oil feeder control valve system
P0031
Oxygen sensor (front) heater circuit low input
P0032
Oxygen sensor (front) heater circuit high input
P0037
Oxygen sensor (rear) heater circuit low input
P0038
Oxygen sensor (rear) heater circuit high input
P0068*1
Trustful check air flow sensor
P0102*1
Air flow sensor circuit low input
P0103*1
Air flow sensor circuit high input
P0107
Manifold absolute pressure sensor circuit low input
P0108
Manifold absolute pressure sensor circuit high input
P0112*1
Intake air temperature sensor circuit low input
P0113*1
Intake air temperature sensor circuit high input
P0117*1
Engine coolant temperature sensor circuit low input
P0118*1
Engine coolant temperature sensor circuit high input
P0121*1
Trustful check throttle position sensor (main)
P0122*1
Throttle position sensor (main) circuit low input
P0123*1
Throttle position sensor (main) circuit high input
P0125
Insufficient coolant temperature for closed loop fuel control
P0131
Oxygen sensor (front) circuit low voltage
P0132
Oxygen sensor (front) circuit high voltage
P0133
Oxygen sensor (front) circuit slow response
P0134
Oxygen sensor (front) circuit no activity detected
P0137
Oxygen sensor (rear) circuit low voltage
P0138
Oxygen sensor (rear) circuit high voltage
P0171
Abnormal fuel system (lean)
P0172
Abnormal fuel system (rich)
P0221*1
Trustful check throttle position sensor (sub)
P0222*1
Throttle position sensor (sub) circuit low input
P0223*1
Throttle position sensor (sub) circuit high input
P0261
No. 1 injector circuit low input
P0262
No. 1 injector circuit high input
P0264
No. 2 injector circuit low input
P0265
No. 2 injector circuit high input
P0267
No. 3 injector circuit low input
P0268
No. 3 injector circuit high input
P0270
No. 4 injector circuit low input
13A-15
MULTIPOINT FUEL INJECTION (MPI)
13A-16
TROUBLESHOOTING
P0271
No. 4 injector circuit high input
P0300*2
Random/multiple cylinder misfire detected
P0301*2
No. 1 cylinder misfire detected
P0302*2
No. 2 cylinder misfire detected
P0303*2
No. 3 cylinder misfire detected
P0304*2
No. 4 cylinder misfire detected
P0335*1
Crank angle sensor system
P0340*1
Inlet camshaft position sensor system
P0421
Catalyst malfunction
P0458
Purge control solenoid valve circuit low input
P0459
Purge control solenoid valve circuit high input
P0602*1
Variant coding system
P0606*1
Engine-ECU main processor malfunction
P060B*1
A/D converter
P060D*1
Trustful check accelerator pedal position sensor
P061A*1
Torque monitoring
P061C*1
Trustful check engine speed
P062F*1
EEPROM malfunction
P0630*1
Chassis number not programmed
P0638*1
Throttle valve control servo circuit range/performance problem
P0642*1
Throttle position sensor power supply
P0657*1
Throttle valve control servo relay circuit malfunction
P1238*1
Air flow sensor trustful for torque monitoring
P1590*1
CVT-ECU to engine-ECU communication error in torque reduction request
P1603*1
Battery backup circuit malfunction
P2100*1
Throttle valve control servo circuit (open)
P2101*1
Throttle valve control servo magneto malfunction
P2122*1
Accelerator pedal position sensor (main) circuit low input
P2123*1
Accelerator pedal position sensor (main) circuit high input
P2127*1
Accelerator pedal position sensor (sub) circuit low input
P2128*1
Accelerator pedal position sensor (sub) circuit high input
P2135*1
Throttle position sensor (main and sub) range/performance problem
P2138*1
Accelerator pedal position sensor (main and sub) range/performance problem
P2228*1
Barometric pressure sensor circuit low input
P2229*1
Barometric pressure sensor circuit high input
P2252
Oxygen sensor offset circuit low voltage
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
P2253
Oxygen sensor offset circuit high voltage
U0101*1
CVT-ECU time-out
U0141*1
ETACS-ECU time-out
13A-17
NOTE: After the engine-ECU has detected a malfunction, the engine warning lamp illuminates when the
engine is next turned on and the same malfunction is re-detected. However, for items marked with a "*1" in
the diagnosis code number column, the engine warning lamp illuminates only on the first detection of the malfunction.
NOTE: The codes marked with a "*2" in the diagnosis code number column have the following two conditions
for illuminating the engine warning lamp.
.
• In case that the misfire causing the damaged catalyst is detected, the engine warning lamp will flash until
the condition is corrected. If the system detects the same malfunction after the next engine start and then
the condition is corrected, the engine warning lamp will flash (not illuminate).
• In case that the misfire deteriorating the exhaust gas is detected, the engine warning lamp is illuminated
when the same malfunction is redetected after the next engine start.
NOTE: Even if the malfunction is not detected when the engine-ECU monitors the malfunction three consecutive times* after the engine warning lamp illuminates, turn off the engine warning lamp when the engine
starts next time.
*: In this case, "one time" in monitoring the malfunction means the period from the time of the current engine
start to the time of the next engine start. "One time" in monitoring the misfire or the fuel system malfunction
means the time when the operating conditions (such as the engine speed or the engine coolant temperature)
becomes similar operating conditions of the first detected malfunction.
METHOD OF READING AND ERASING
DIAGNOSIS CODES
Refer to GROUP 00 − How to Use Troubleshooting/Inspection Service Points − Diagnosis Function .
INSPECTION WITH M.U.T.-III DATA LIST
AND ACTUATOR TEST
Reading data list or performing an actuator test using
M.U.T.-III enables you to check the vehicle body harnesses and components for abnormalities. Sensor
input or output to the actuator can be displayed in
numerical values or graphs in the data list while in
the actuator test the actuator can be forced to drive
(ON/OFF driving in the specified time).
DIAGNOSIS PROCEDURE
1. Connect M.U.T.-III to perform inspection with the
data list and actuator test function.
2. If any abnormality is found, inspect and repair
vehicle body harnesses and components.
3. After repair, check that input and output have
returned to normal.
4. If a failure code which is caused by inspection
and repair work is generated, erase the failure
code.
5. Disconnect M.U.T.-III and perform a test run to
check that the malfunction phenomenon is
resolved.
PROVISIONAL DIAGNOSIS CODE CONFIRMED
If detecting the malfunction during the first drive
cycle, the engine-ECU temporarily stores the diagnosis code as the provisional diagnosis code. If detecting the same malfunction during the next drive cycle,
the engine-ECU determines that the malfunction
exists. The engine-ECU outputs the diagnosis code.
On the M.U.T.-III, it is possible to display the stored
provisional diagnosis code which the engine-ECU
had detected during the first drive cycle. This makes
it possible to confirm in one drive cycle whether the
malfunction could happen again after the repair.
CONFIRMATION METHOD
1. After the ignition switch is in "LOCK" (OFF) position, connect the M.U.T.-III to the diagnosis connector.
2. Turn the ignition switch to the "ON" position.
3. Select "MPI/GDI/DIESEL" from System select
Screen of the M.U.T.-III.
4. Select "Special Function" from MPI/GDI/DIESEL
Screen.
MULTIPOINT FUEL INJECTION (MPI)
13A-18
TROUBLESHOOTING
5. Select "Provisional DTCs" from Special Function
Screen.
FREEZE FRAME DATA
When the engine-ECU detects a malfunction and
stores a diagnosis code, it also stores a current status of the engine. This function is called "Freeze
frame data". By analyzing this "Freeze frame" data
with the M.U.T.-III, an effective troubleshooting can
be performed.
The display items of freeze frame data are shown
below.
DISPLAY ITEM LIST
Item No.
Date Item
Unit/Condition
1
Odometer
km
2
Ignition cycle (Warm up cycle)
−
4
Accumulated minute*1
min
AA*2
Air flow sensor
g/s
AB*2
Throttle position sensor (main)
%
BB*2
Barometric pressure sensor
kPa
BC*2
Relative throttle position sensor
%
BD*2
Throttle position sensor (sub)
%
BE*2
Accelerator pedal position sensor (main)
%
BF*2
Accelerator pedal position sensor (sub)
%
C0*2
Fuel system status 1
• CL (closed loop)*3
• OL (open loop)*4
• OL:DRV (condition of open loop
due to acceleration and
deceleration driving)
• OL:SYS (condition of open loop
due to system failure)
• CL:HO2S (condition of closed
loop only using front oxygen
sensor when rear oxygen sensor
is failed)
C1*2*5
Fuel system status 2
N/A
C2*2
Calculated load value
%
C3*2
Engine coolant temperature sensor
°C
C4*2
Short term fuel trim 1
%
C5*2*5
Short term fuel trim 3
****
C6*2
Long term fuel trim 1
%
C7*2*5
Long term fuel trim 3
****
CC*2
Manifold absolute pressure sensor
kPa
CD*2
Crank angle sensor
r/min
CE*2
Vehicle speed
km/h
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
Item No.
Date Item
Unit/Condition
CF*2
Advance ignition
°CA
D0*2
Intake air temperature sensor 1
°C
D1*2
Time since engine running*6
sec
D6*2
Purge solenoid duty
%
D8*2
Power supply voltage
V
D9*2
Absolute load value
%
DA*2
Target equivalence ratio
−
DB*2
Intake air temperature sensor 1
°C
DC*2
Throttle actuator
%
DD*2
Relative accelerator pedal position sensor
%
13A-19
NOTE: *1: Accumulated time of current malfunction from time point when malfunction is detected.
NOTE: *2: The items can be seen by selecting "Freeze Frame Data (OBD)" on Self-diagnosis Screen of
MUT-III. If detecting multiple malfunctions, the engine-ECU stores the data for only the first item that was
detected. If detecting the misfire or fuel system malfunction, the engine-ECU stores the data by giving priority
to the misfire or fuel system malfunction in spite of the chronological order of the detected malfunction.
NOTE: The Freeze Frame Data (OBD) should not be stored for the diagnosis code when the engine warning
lamp does not illuminate.
NOTE: *3: Condition in which oxygen sensor signals are fed back to the engine-ECU for controlling fuel.
NOTE: *4: Condition in which fuel is controlled without oxygen sensor signals being fed back to the
engine-ECU because the condition to shift to the closed loop is not met.
NOTE: *5: Data items are displayed on M.U.T.-III display, but the in-line 4 engine is not applicable and its data
is displayed as "N/A" or "****".
NOTE: *6: Time between engine start and malfunction detection
FAIL-SAFE AND BACKUP FUNCTION
This function exercises control, by predetermined
control logic, to keep a condition in which a vehicle
can be safely driven when main sensor failures are
detected by the diagnosis function.
List of fail-safe and backup function items
Code No. Diagnosis item
Control content during malfunction
P0010
Inlet oil feeder control valve system
V.V.T. phase angle (intake) becomes most
retarded angle.
P0068
Trustful check air flow sensor
Fuel control is carried out using throttle
opening degree and engine speed in
accordance with preset map.
P0102
Air flow sensor circuit low input
Fuel control is carried out using throttle
opening degree and engine speed in
accordance with preset map.
P0103
Air flow sensor circuit high input
Fuel control is carried out using throttle
opening degree and engine speed in
accordance with preset map.
MULTIPOINT FUEL INJECTION (MPI)
13A-20
TROUBLESHOOTING
Code No. Diagnosis item
Control content during malfunction
P0107
Manifold absolute pressure sensor circuit low
input
Control as if the inlet manifold vacuum
pressure is 101 kPa.
P0108
Manifold absolute pressure sensor circuit high Control as if the inlet manifold vacuum
input
pressure is 101 kPa.
P0112
Intake air temperature sensor circuit low input
P0113
Intake air temperature sensor circuit high input Control as if the intake air temperature is 25°C.
P0117
Engine coolant temperature sensor circuit low
input
P0118
Engine coolant temperature sensor circuit high Control as if the engine coolant temperature is
input
80°C.
P0121
Trustful check throttle position sensor (main)
P0122
Throttle position sensor (main) circuit low input • Throttle opening degree is restricted.
• Throttle opening degree position is in
default position if throttle position sensor
(sub) fails.
P0123
Throttle position sensor (main) circuit high
input
P0125
Insufficient coolant temperature for closed loop Control as if the engine coolant temperature is
fuel control
80°C.
P0221
Trustful check throttle position sensor (sub)
• Throttle opening degree is restricted.
• Throttle opening degree position is in
default position if throttle position sensor
(main) fails.
P0222
Throttle position sensor (sub) circuit low input
• Throttle opening degree is restricted.
• Throttle opening degree position is in
default position if throttle position sensor
(main) fails.
P0223
Throttle position sensor (sub) circuit high input
• Throttle opening degree is restricted.
• Throttle opening degree position is in
default position if throttle position sensor
(main) fails.
P0300
Random/multiple cylinder misfire detected
The supply of fuel to the misfiring cylinder can
possibly be cut.
P0301
No. 1 cylinder misfire detected
The supply of fuel to the misfiring cylinder can
possibly be cut.
P0302
No. 2 cylinder misfire detected
The supply of fuel to the misfiring cylinder can
possibly be cut.
P0303
No. 3 cylinder misfire detected
The supply of fuel to the misfiring cylinder can
possibly be cut.
P0304
No. 4 cylinder misfire detected
The supply of fuel to the misfiring cylinder can
possibly be cut.
Control as if the intake air temperature is 25°C.
Control as if the engine coolant temperature is
80°C.
• Throttle opening degree is restricted.
• Throttle opening degree position is in
default position if throttle position sensor
(sub) fails.
• Throttle opening degree is restricted.
• Throttle opening degree position is in
default position if throttle position sensor
(sub) fails.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
13A-21
Code No. Diagnosis item
Control content during malfunction
P0327
Detonation sensor circuit low input
Fix the ignition timing with an allowance
against detonation.
P0328
Detonation sensor circuit high input
Fix the ignition timing with an allowance
against detonation.
P0340
Inlet camshaft position sensor system
• Engine runs in learned pattern until engine
stops.
• Does not control variable valve timing
(V.V.T.).
P0513
Immobilizer malfunction
Engine start is prohibited.
P0604
RAM error
• Microcomputer is reset.
or
• Throttle opening degree position is in
default position.
P0606
Engine-ECU main processor malfunction
Throttle opening degree position is in default
position.
P060B
A/D converter
Throttle opening degree position is in default
position.
P060D
Trustful check accelerator pedal position
sensor
Throttle opening degree position is in default
position.
P061A
Torque monitoring
Throttle opening degree position is in default
position.
P061C
Trustful check engine speed
Throttle opening degree position is in default
position.
P061F
Fail-safe control system
Microcomputer is reset.
P0622
Alternator FR terminal system
Prohibits alternator output suppression control
against current consumers. (Operates as a
normal alternator.)
P0638
Throttle valve control servo circuit
range/performance problem
Throttle opening degree position is in default
position.
P0642
Throttle position sensor power supply
Throttle opening degree position is in default
position.
P0657
Throttle valve control servo relay circuit
malfunction
Throttle opening degree position is in default
position.
P1231
Trustful check active stability control (ASC)
Torque requested by active stability control
(ASC) is ignored.
P1238
Air flow sensor trustful for torque monitoring
Throttle opening degree position is in default
position.
P1240
Trustful check ignition angle
Ignition retard is not carried out.
P1242
Fail safe control monitoring
Throttle opening degree position is in default
position.
P1243
Inquiry/response error
Microcomputer is reset.
P1247
Trustful Check CVT
Torque requested by CVT-ECU is ignored.
P1590
CVT-ECU to engine-ECU communication error Engine output is restricted.
in torque reduction request
P1603
Battery backup circuit malfunction
All diagnosis codes are stored once failure
judgment is completed.
MULTIPOINT FUEL INJECTION (MPI)
13A-22
TROUBLESHOOTING
Code No. Diagnosis item
Control content during malfunction
P2100
Throttle valve control servo circuit (open)
Throttle opening degree position is in default
position.
P2101
Throttle valve control servo magneto
malfunction
Throttle opening degree position is in default
position.
P2122
Accelerator pedal position sensor (main) circuit
low input
• Throttle opening degree is restricted.
• Throttle opening degree position is in
default position if accelerator pedal position
sensor (sub) fails.
P2123
Accelerator pedal position sensor (main) circuit
high input
• Throttle opening degree is restricted.
• Throttle opening degree position is in
default position if accelerator pedal position
sensor (sub) fails.
P2127
Accelerator pedal position sensor (sub) circuit
low input
• Throttle opening degree is restricted.
• Throttle opening degree position is in
default position if accelerator pedal position
sensor (main) fails.
P2128
Accelerator pedal position sensor (sub) circuit
high input
• Throttle opening degree is restricted.
• Throttle opening degree position is in
default position if accelerator pedal position
sensor (main) fails.
P2135
Throttle position sensor (main and sub) circuit
range/performance problem
Throttle opening degree position is in default
position.
P2138
Accelerator pedal position sensor (main and
sub) circuit range/performance
• Throttle opening degree is restricted.
• Throttle opening degree position is in
default position if accelerator pedal position
sensor (sub) fails.
P2228
Barometric pressure sensor circuit low input
Control as if the barometric pressure is 101
kPa.
P2229
Barometric pressure sensor circuit high input
Control as if the barometric pressure is 101
kPa.
P2253
Oxygen sensor offset circuit high voltage
Does not control air-fuel ratio closed loop.
U0167
KOS-ECU communication error
Engine start is prohibited.
U0415
ASC-ECU CAN data abnormality
Torque requested by active stability control
(ASC) is ignored.
MULTIPOINT FUEL INJECTION (MPI)
13A-23
TROUBLESHOOTING
INSPECTION CHART FOR DIAGNOSIS CODE
M1131151006224
WARNING
When touching the throttle valve, surely shut off the driving circuits of the throttle valve. In
the event that the throttle valve is operated, a finger might be injured as the result of being
caught by the throttle valve.
CAUTION
When the ignition switch is turned ON with the connector disconnected in proceeding with troubleshooting, the diagnosis code may be stored in other systems. Erase codes if diagnosis codes of all
the systems are checked and the codes are output after completion of the troubleshooting.
Code No. Diagnosis item
Reference page
P0010
Inlet oil feeder control valve system
P.13A-25
P0011
Intake variable valve timing system
P.13A-27
P0031
Oxygen sensor (front) heater circuit low input
P.13A-28
P0032
Oxygen sensor (front) heater circuit high input
P.13A-29
P0037
Oxygen sensor (rear) heater circuit low input
P.13A-30
P0038
Oxygen sensor (rear) heater circuit high input
P.13A-32
P0068
Trustful check air flow sensor
P.13A-32
P0102
Air flow sensor circuit low input
P.13A-33
P0103
Air flow sensor circuit high input
P.13A-35
P0107
Manifold absolute pressure sensor circuit low input
P.13A-36
P0108
Manifold absolute pressure sensor circuit high input
P.13A-37
P0112
Intake air temperature sensor circuit low input
P.13A-39
P0113
Intake air temperature sensor circuit high input
P.13A-40
P0117
Engine coolant temperature sensor circuit low input
P.13A-41
P0118
Engine coolant temperature sensor circuit high input
P.13A-42
P0121
Trustful check throttle position sensor (main)
P.13A-44
P0122
Throttle position sensor (main) circuit low input
P.13A-45
P0123
Throttle position sensor (main) circuit high input
P.13A-46
P0125
Insufficient coolant temperature for closed loop fuel control
P.13A-47
P0131
Oxygen sensor (front) circuit low voltage
P.13A-49
P0132
Oxygen sensor (front) circuit high voltage
P.13A-50
P0133
Oxygen sensor (front) circuit slow response
P.13A-51
P0134
Oxygen sensor (front) circuit no activity detected
P.13A-52
P0137
Oxygen sensor (rear) circuit low voltage
P.13A-54
P0138
Oxygen sensor (rear) circuit high voltage
P.13A-55
P0171
Abnormal fuel system (lean)
P.13A-56
P0172
Abnormal fuel system (rich)
P.13A-58
P0221
Trustful check throttle position sensor (sub)
P.13A-59
P0222
Throttle position sensor (sub) circuit low input
P.13A-60
MULTIPOINT FUEL INJECTION (MPI)
13A-24
TROUBLESHOOTING
Code No. Diagnosis item
Reference page
P0223
Throttle position sensor (sub) circuit high input
P.13A-61
P0261
No. 1 injector circuit low input
P.13A-62
P0262
No. 1 injector circuit high input
P.13A-63
P0264
No. 2 injector circuit low input
P.13A-64
P0265
No. 2 injector circuit high input
P.13A-65
P0267
No. 3 injector circuit low input
P.13A-66
P0268
No. 3 injector circuit high input
P.13A-67
P0270
No. 4 injector circuit low input
P.13A-68
P0271
No. 4 injector circuit high input
P.13A-69
P0300
Random/multiple cylinder misfire detected
P.13A-70
P0301
No. 1 cylinder misfire detected
P.13A-72
P0302
No. 2 cylinder misfire detected
P.13A-73
P0303
No. 3 cylinder misfire detected
P.13A-74
P0304
No. 4 cylinder misfire detected
P.13A-75
P0327
Detonation sensor circuit low input
P.13A-77
P0328
Detonation sensor circuit high input
P.13A-78
P0335
Crank angle sensor system
P.13A-78
P0340
Inlet camshaft position sensor system
P.13A-80
P0421
Catalyst malfunction
P.13A-82
P0458
Purge control solenoid valve circuit low input
P.13A-83
P0459
Purge control solenoid valve circuit high input
P.13A-84
P0513
Immobilizer malfunction
P.13A-85
P0602
Variant coding system
P.13A-86
P0604
RAM error
P.13A-87
P0606
Engine-ECU main processor malfunction
P.13A-87
P060B
A/D converter
P.13A-88
P060D
Trustful check accelerator pedal position sensor
P.13A-89
P061A
Torque monitoring
P.13A-89
P061C
Trustful check engine speed
P.13A-90
P061F
Fail-safe control system
P.13A-91
P0622
Alternator FR terminal system
P.13A-91
P062F
EEPROM malfunction
P.13A-92
P0630
Chassis number not programmed
P.13A-93
P0638
Throttle valve control servo circuit range/performance problem
P.13A-93
P0642
Throttle position sensor power supply
P.13A-94
P0657
Throttle valve control servo relay circuit malfunction
P.13A-94
P1231
Trustful check active stability control (ASC) <Vehicles with ASC>
P.13A-96
MULTIPOINT FUEL INJECTION (MPI)
13A-25
TROUBLESHOOTING
Code No. Diagnosis item
Reference page
P1238
Air flow sensor trustful for torque monitoring
P.13A-97
P1240
Trustful check ignition angle <Vehicles with ASC>
P.13A-97
P1242
Fail safe control monitoring
P.13A-98
P1243
Inquiry/response error
P.13A-98
P1247
Trustful check CVT
P.13A-99
P1590
CVT-ECU to engine-ECU communication error in torque reduction
request
P.13A-99
P1603
Battery backup circuit malfunction
P.13A-100
P2100
Throttle valve control servo circuit (open)
P.13A-100
P2101
Throttle valve control servo magneto malfunction
P.13A-102
P2122
Accelerator pedal position sensor (main) circuit low input
P.13A-102
P2123
Accelerator pedal position sensor (main) circuit high input
P.13A-104
P2127
Accelerator pedal position sensor (sub) circuit low input
P.13A-105
P2128
Accelerator pedal position sensor (sub) circuit high input
P.13A-106
P2135
Throttle position sensor (main and sub) range/performance problem
P.13A-107
P2138
Accelerator pedal position sensor (main and sub) range/performance
problem
P.13A-108
P2228
Barometric pressure sensor circuit low input
P.13A-110
P2229
Barometric pressure sensor circuit high input
P.13A-110
P2252
Oxygen sensor offset circuit low voltage
P.13A-111
P2253
Oxygen sensor offset circuit high voltage
P.13A-112
P2530
Ignition switch-IG1 circuit
P.13A-113
U0101
CVT-ECU time-out
P.13A-114
U0121
ABS-ECU <Vehicles with ABS> or ASC-ECU <Vehicles with ASC>
time-out
P.13A-116
U0131
EPS-ECU time-out
P.13A-117
U0141
ETACS-ECU time-out
P.13A-119
U0167
KOS-ECU communication error <Vehicles with KOS>
P.13A-120
U0415
ASC-ECU CAN data abnormality <Vehicles with ASC>
P.13A-121
DIAGNOSIS CODE PROCEDURES
Code No. P0010: Inlet Oil Feeder Control Valve System
OPERATION
• Power is supplied to the inlet oil feeder control
valve connector terminal from the engine control
relay connector terminal.
• The engine-ECU connector terminal OCVI makes
the power transistor in the unit be in ON position,
and that makes currents go on the inlet oil feeder
control valve connector terminal.
13A-26
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
FUNCTION
• The engine-ECU controls the spool valve position
of the inlet oil feeder control valve corresponding
to the driving condition of the engine and continuously changes the angle of the intake camshaft.
TROUBLE JUDGMENT
Check Condition
• Ignition switch is "ON" position.
• Inlet oil feeder control valve is OFF.
• Battery positive voltage is more than 10 V and is
less than 16.5 V.
Judgement Criterion
• The engine-ECU terminal current value of inlet oil
feeder control valve circuit is less than 0.1 A for 2
seconds.
• The engine-ECU terminal current value of inlet oil
feeder control valve circuit is more than 2.9 A.
FAIL-SAFE AND BACKUP FUNCTION
• V.V.T. phase angle (inlet) becomes most retarded
angle.
PROBABLE CAUSES
• Failed inlet oil feeder control valve
• Open/short circuit or harness damage in inlet oil
feeder control valve circuit or loose connector
contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check inlet oil feeder control valve itself.
• Inlet oil feeder control valve connector check.
• Oil feeder control valve check (Refer to
P.13A-190).
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair or replace the connector, or replace
the inlet oil feeder control valve.
YES : Go to Step 4.
NO : Go to Step 3.
STEP 3. Connector check: engine control relay
connector
Q: Is the check result normal?
YES : Check intermediate connector, and repair if
necessary. If intermediate connector is
normal, check and repair harness between
engine control relay connector terminal and
inlet oil feeder control valve connector
terminal power supply line.
• Check power supply line for
open/short circuit.
NO : Repair or replace the connector.
STEP 4. Perform voltage measurement at
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal OCVI and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or check
and repair harness between inlet oil feeder
control valve connector terminal and
engine-ECU connector terminal OCVI.
• Check output line for open/short
circuit.
STEP 5. Check harness between engine control
relay connector terminal and inlet oil feeder
control valve connector terminal power supply
line.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 2. Perform voltage measurement at inlet oil
feeder control valve connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal power supply line and
body earth.
OK: System voltage
Q: Is the check result normal?
STEP 6. Check harness between inlet oil feeder
control valve connector terminal and engine-ECU
connector terminal OCVI.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair the damaged harness wire.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 7. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
13A-27
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P0011: Inlet Variable Valve Timing System
OPERATION
• Check code No. P0010: inlet oil feeder control
valve system (Refer to P.13A-25).
FUNCTION
• The engine-ECU controls the spool valve position
of the inlet oil feeder control valve corresponding
to the driving condition of the engine and continuously changes the phase of the inlet camshaft.
• The phase angle of the inlet camshaft is computed from the signal patterns of the crank angle
sensor and inlet camshaft position sensor.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 36: V.V.T. phase angle (inlet)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
TROUBLE JUDGMENT
Check Conditions
• More than 20 seconds have passed since the
engine starting sequence was completed.
• Engine speed is more than 1,188 r/min.
• Engine coolant temperature is more than 76°C.
Judgment Criterion
• Difference between inlet valve open timing and
target inlet valve open timing is more than 5°CA
for 5 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed inlet oil feeder control valve
• Damage in inlet oil feeder control valve circuit or
loose connector contact
• Failed inlet timing sprocket operation
• Clogged oil passage
• Failed inlet camshaft
• Failed engine-ECU
STEP 2. Check inlet oil feeder control valve itself.
• Oil feeder control valve check (Refer to
P.13A-190).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Replace the inlet oil feeder control valve.
STEP 3. Check harness between inlet oil feeder
control valve connector terminal and engine-ECU
connector terminal OCVI.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. Check harness between engine control
relay connector terminal and inlet oil feeder
control valve connector terminal.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 5. Check inlet camshaft sensing portion.
Q: Is the check result normal?
13A-28
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Go to Step 6.
NO : Replace the inlet camshaft.
STEP 6. Check inlet variable valve timing
sprocket operation mechanism for being stuck.
• Check inlet variable valve timing sprocket
(Refer to GROUP 11B − Timing Chain − Inspection ).
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair it.
STEP 7. Check oil passage of inlet variable valve
timing control system for being clogged.
YES : Go to Step 8.
NO : Repair it.
STEP 8. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Q: Is the check result normal?
Code No. P0031: Oxygen Sensor (front) Heater Circuit Low Input
OPERATION
• Power is supplied to the heater power terminal of
the oxygen sensor (front) connector from the
engine control relay connector terminal.
• The heater of the oxygen sensor (front) connector terminal is controlled by the power transistor
in the engine-ECU connector terminal OHFL.
FUNCTION
• The power supply to the oxygen sensor (front)
heater is controlled by the ON/OFF control of the
power transistor in the engine-ECU.
• Heating the oxygen sensor (front) heater enables
the oxygen sensor (front) to provide good
response even when the exhaust emission temperature is low.
TROUBLE JUDGMENT
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• While the oxygen sensor (front) heater is on.
• Battery positive voltage is more than 11 V and is
less than 16.5 V.
Judgement Criterion
• The oxygen sensor (front) heater current is less
than 0.17 A for 2 seconds.
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• While the oxygen sensor (front) heater is off.
• Battery positive voltage is more than 11 V and is
less than 16.5 V.
Judgement Criterion
• The oxygen sensor (front) heater voltage is less
than 2.0 V for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed oxygen sensor (front) heater
• Open/short circuit or harness damage in oxygen
sensor (front) heater circuit or loose connector
contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Perform resistance measurement at
oxygen sensor (front) connector.
• Disconnect connector, and measure at sensor
side.
• Resistance between terminal power supply line
and engine-ECU OHFL line.
OK: 4.5 − 8.0 Ω (at 20°C)
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair or replace the connector, or replace
the oxygen sensor (front).
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 2. Perform voltage measurement at oxygen
sensor (front) connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal power supply line and
body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or check
and repair harness between oxygen sensor
(front) connector terminal and engine
control relay connector terminal.
• Check power supply line for
open/short circuit.
13A-29
STEP 4. Check harness between oxygen sensor
(front) connector terminal and engine-ECU
connector terminal OHFL.
• Check earthing line for damage.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 5. Check harness between oxygen sensor
(front) connector terminal and engine control
relay connector terminal.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 3. Perform voltage measurement at
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal OHFL and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or check
intermediate connector, and repair if
necessary. If intermediate connector is
normal, check and repair harness between
oxygen sensor (front) connector terminal
and engine-ECU connector terminal OHFL.
• Check earthing line for open/short
circuit.
STEP 6. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P0032: Oxygen Sensor (front) Heater Circuit High Input
OPERATION
• Power is supplied to the heater power terminal of
the oxygen sensor (front) connector from the
engine control relay connector terminal.
• The heater of the oxygen sensor (front) connector terminal is controlled by the power transistor
in the engine-ECU connector terminal OHFL.
FUNCTION
• The power supply to the oxygen sensor (front)
heater is controlled by the ON/OFF control of the
power transistor in the engine-ECU.
• Heating the oxygen sensor (front) heater enables
the oxygen sensor (front) to provide good
response even when the exhaust emission temperature is low.
TROUBLE JUDGMENT
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• While the oxygen sensor (front) heater is on.
• Battery positive voltage is more than 11 V and is
less than 16.5 V.
13A-30
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
Judgement Criterion
• The oxygen sensor (front) heater current is more
than 10.5 A for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed oxygen sensor (front) heater
• Short circuit in oxygen sensor (front) heater circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Perform resistance measurement at
oxygen sensor (front) connector.
• Disconnect connector, and measure at sensor
side.
• Resistance between terminal power supply line
and engine-ECU OHFL line.
OK: 4.5 − 8.0 Ω (at 20°C)
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair or replace the connector, or replace
the oxygen sensor (front).
STEP 2. Check harness between engine control
relay connector terminal and oxygen sensor
(front) connector terminal.
• Check power supply line for short circuit.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 3. Check harness between oxygen sensor
(front) connector terminal and engine-ECU
connector terminal OHFL.
• Check earthing line for short circuit.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P0037: Oxygen Sensor (rear) Heater Circuit Low Input
OPERATION
• Power is supplied to the heater power connector
terminal of the oxygen sensor (rear) connector
from the engine control relay connector terminal.
• The heater of the oxygen sensor (rear) connector
terminal is controlled by the power transistor in
the engine-ECU connector terminal OHRL.
FUNCTION
• The power supply to the oxygen sensor (rear)
heater is controlled by the ON/OFF control of the
power transistor in the engine-ECU.
• Heating the oxygen sensor (rear) heater enables
the oxygen sensor (rear) to provide good
response even when the exhaust emission temperature is low.
Judgement Criterion
• The oxygen sensor (rear) heater voltage is less
TROUBLE JUDGMENT
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• While the oxygen sensor (rear) heater is on.
• Battery positive voltage is more than 11 V and is
less than 16.5 V.
Judgement Criterion
• The oxygen sensor (rear) heater current is less
than 0.17 A for 2 seconds.
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• While the oxygen sensor (rear) heater is off.
• Battery positive voltage is more than 11 V and is
less than 16.5 V.
than 2.0 V for 2 seconds.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed oxygen sensor (rear) heater
• Open/short circuit or harness damage in oxygen
sensor (rear) heater circuit or loose connector
contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Perform resistance measurement at
oxygen sensor (rear) connector.
• Disconnect connector, and measure at sensor
side.
• Resistance between terminals.
OK: 4.5 − 8.0 Ω (at 20°C)
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair or replace the connector, or replace
the oxygen sensor (rear).
STEP 2. Perform voltage measurement at oxygen
sensor (rear) connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal power supply line and
body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or check
intermediate connector, and repair if
necessary. If intermediate connector is
normal, check and repair harness between
oxygen sensor (rear) connector terminal
and engine control relay connector terminal.
• Check power supply line for
open/short circuit.
13A-31
STEP 3. Perform voltage measurement at
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal OHRL and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or check
intermediate connectors, and repair if
necessary. If intermediate connectors are
normal, check and repair harness between
oxygen sensor (rear) connector terminal
and engine-ECU connector terminal OHRL.
• Check earthing line for open/short
circuit.
STEP 4. Check harness between oxygen sensor
(rear) connector terminal and engine-ECU
connector terminal OHRL.
• Check earthing line for damage.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 5. Check harness between oxygen sensor
(rear) connector terminal and engine control
relay connector terminal.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 6. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
13A-32
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
Code No. P0038: Oxygen Sensor (rear) Heater Circuit High Input
OPERATION
• Power is supplied to the heater power connector
terminal of the oxygen sensor (rear) connector
from the engine control relay connector terminal.
• The heater the oxygen sensor (rear) connector
terminal is controlled by the power transistor in
the engine-ECU connector terminal OHRL.
FUNCTION
• The power supply to the oxygen sensor (rear)
heater is controlled by the ON/OFF control of the
power transistor in the engine-ECU.
• Heating the oxygen sensor (rear) heater enables
the oxygen sensor (rear) to provide good
response even when the exhaust emission temperature is low.
TROUBLE JUDGMENT
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• While the oxygen sensor (rear) heater is on.
• Battery positive voltage is more than 11 V and is
less than 16.5 V.
Judgement Criterion
• The oxygen sensor (rear) heater current is more
than 10.5 A for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed oxygen sensor (rear) heater
• Short circuit in oxygen sensor (rear) heater circuit
or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Perform resistance measurement at
oxygen sensor (rear) connector.
• Disconnect connector, and measure at sensor
side.
• Resistance between terminals.
OK: 4.5 − 8.0 Ω (at 20°C)
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair or replace the connector, or replace
the oxygen sensor (rear).
STEP 2. Check harness between engine control
relay connector terminal and oxygen sensor
(rear) connector terminal.
• Check power supply line for short circuit.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 3. Check harness between oxygen sensor
(rear) connector terminal and engine-ECU
connector terminal OHRL.
• Check earthing line for short circuit.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P0068: Trustful Check Air Flow Sensor
FUNCTION
• Compare the actual measurement of volumetric
efficiency by an air flow sensor signal with volu-
metric efficiency estimated from a throttle position
sensor (main and sub) signal.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
TROUBLE JUDGMENT
Check Condition
• Plausibility error of the throttle position sensor
(main) is detected.
• Plausibility error of the throttle position sensor
(sub) is detected.
Judgement Criterion
• Difference between the volumetric efficiency estimated by the throttle position sensor (main) and
the volumetric efficiency estimated by the throttle
position sensor (sub) is less than 8.8 %.
FAIL-SAFE AND BACKUP FUNCTION
• Fuel control is carried out using throttle opening
degree and engine speed in accordance with preset map.
13A-33
STEP 2. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 10: Air flow sensor
Q: Is the check result normal?
YES : Go to Step 3.
NO : Check air flow sensor system. Check code
No. P0102: air flow sensor circuit low input
(Refer to P.13A-33). Check code No.
P0103: air flow sensor circuit high input
(Refer to P.13A-35).
STEP 3. Check air intake from inlet hose and inlet
manifold.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair.
PROBABLE CAUSES
• Failed air flow sensor
• Harness damage in air flow sensor circuit or
loose connector contact
• There is some foreign matter around air flow sensor
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is any other diagnosis code than P0068 set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 4. Check air flow sensor.
• Check that there is not foreign matter around air
flow sensor.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair.
STEP 5. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P0102: Air Flow Sensor Circuit Low Input
OPERATION
• Power is supplied by the engine control relay
connector terminal to the air flow sensor connector terminal.
• Power is supplied by the engine-ECU connector
terminal AFS5 to the air flow sensor connector
terminal, and the air flow sensor connector terminal is earthed through the engine-ECU connector
terminal AFSE.
• The air flow sensor connector terminal outputs a
sensor signal, which is input into the engine-ECU
connector terminal AFS.
FUNCTION
• The air flow sensor outputs current that varies in
accordance with the intake air volume.
• The engine-ECU uses the amperage output by
the air flow sensor and the engine speed signal in
order to determine the basic injection duration of
the injector.
TROUBLE JUDGMENT
Check Condition
• More than 3 seconds have passed since the ignition switch was turned to "ON" position.
13A-34
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
Judgement Criterion
• Air flow sensor output voltage is less than 0.2 V
(corresponding to an air flow rate of 0 g/sec or
less) for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• Fuel control is carried out using throttle opening
degree and engine speed in accordance with preset map.
PROBABLE CAUSES
• Failed air flow sensor
• Open/short circuit or harness damage in air flow
sensor circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 10: Air flow sensor
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Perform voltage measurement at air flow
sensor connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal power supply line and
body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or check
and repair harness between engine control
relay connector terminal and air flow sensor
connector terminal.
• Check power supply line for
open/short circuit.
STEP 3. Perform voltage measurement at air flow
sensor connector.
• Use special tool test harness (MB991709) to connect connector, and measure at pick-up harness.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU AFS5 line
and body earth.
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Perform voltage measurement at
engine-ECU connector.
• Measure engine-ECU connector terminal voltage.
• Ignition switch: "ON"
• Voltage between terminal AFS5 and body earth.
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or check
and repair harness between engine-ECU
connector terminal AFS5 and air flow
sensor connector terminal No. 2.
• Check power supply line for
open/short circuit.
STEP 5. Check harness between air flow sensor
connector terminal and engine-ECU connector
terminal AFS.
• Check output line for open/short circuit and damage.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 6. Check harness between engine control
relay connector terminal and air flow sensor
connector terminal.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 7. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 10: Air flow sensor
Q: Is the check result normal?
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 8.
13A-35
STEP 8. Replace the air flow sensor
• After replacing the air flow sensor, reconfirm
whether the diagnosis code is set.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
Code No. P0103: Air Flow Sensor Circuit High Input
OPERATION
• Power is supplied by the engine control relay
connector terminal to the air flow sensor connector terminal.
• Power is supplied by the engine-ECU connector
terminal AFS5 to the air flow sensor connector
terminal, and the air flow sensor connector terminal is earthed through the engine-ECU connector
terminal AFSE.
• The air flow sensor connector terminal outputs a
sensor signal, which is input into the engine-ECU
connector terminal AFS.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 10: Air flow sensor
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
FUNCTION
• The air flow sensor outputs current that varies in
accordance with the intake air volume.
• The engine-ECU uses the amperage output by
the air flow sensor and the engine speed signal in
order to determine the basic injection duration of
the injector.
TROUBLE JUDGMENT
Check Condition
• More than 3 seconds have passed since the ignition switch was turned to "ON" position.
STEP 2. Perform resistance measurement at air
flow sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal engine-ECU AFSE
line and body earth.
OK: Continuity (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 3.
Judgement Criterion
• Air flow sensor output voltage is more than 4.9 V
(corresponding to an air flow rate of 300 g/sec or
more) for 2 seconds.
STEP 3. Check harness between air flow sensor
connector terminal and engine-ECU connector
terminal AFSE.
• Check earthing line for open circuit and damage.
FAIL-SAFE AND BACKUP FUNCTION
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
• Fuel control is carried out using throttle opening
degree and engine speed in accordance with preset map.
PROBABLE CAUSES
• Failed air flow sensor
• Open circuit or harness damage in air flow sensor
circuit or loose connector contact
• Failed engine-ECU
the damaged harness wire.
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 10: Air flow sensor
Q: Is the check result normal?
13A-36
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 6.
STEP 5. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 10: Air flow sensor
STEP 6. Replace the air flow sensor
• After replacing the air flow sensor, reconfirm
whether the diagnosis code is set.
Q: Is the check result normal?
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
Code No. P0107: Manifold Absolute Pressure Sensor Circuit Low Input
OPERATION
• A power voltage of 5 V is applied to the manifold
absolute pressure sensor power terminal from
the engine-ECU connector terminal MAP5 and
earthed to the engine-ECU connector terminal
MAPE from the manifold absolute pressure sensor connector terminal.
• The sensor signal is inputted to the engine-ECU
connector terminal MAP from the manifold absolute pressure sensor output terminal.
FUNCTION
• The manifold absolute pressure sensor detects a
change in inlet manifold pressure and inputs the
signal to the engine-ECU.
• In response to the signal, the engine-ECU corrects the fuel injection amount, etc.
TROUBLE JUDGMENT
Check Conditions
• More than 8 minutes have passed since the
engine starting sequence was completed, when
the engine coolant temperature at engine start is
less than 0°C.
• Volumetric efficiency is more than 20 %.
Judgement Criterion
• Manifold absolute pressure sensor output voltage
is less than 0.2 V (corresponding to a manifold
absolute pressure of 5 kPa or less) for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• Control as if the inlet manifold vacuum pressure
is 101 kPa.
PROBABLE CAUSES
• Failed manifold absolute pressure sensor
• Open/short circuit or harness damage in manifold
absolute pressure sensor circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 8: Manifold absolute pressure sensor
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Perform voltage measurement at
manifold absolute pressure sensor connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU MAP5 line
and body earth.
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 3.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 3. Check harness between manifold
absolute pressure sensor connector terminal
and engine-ECU connector terminal MAP5.
• Check power supply line for open/short circuit.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 8: Manifold absolute pressure sensor
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
STEP 5. Check harness between manifold
absolute pressure sensor connector terminal
and engine-ECU connector terminal MAP5.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 6. Perform voltage measurement at
manifold absolute pressure sensor connector.
• Use special tool test harness (MB991709) to connect connector, and measure at pick-up harness.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU MAP line
and body earth.
Altitude 0 m: 3.8 − 4.2 V
Altitude 600 m: 3.5 − 3.9 V
Altitude 1,200 m: 3.3 − 3.7 V
Altitude 1,800 m: 3.0 − 3.4 V
13A-37
YES : Go to Step 8.
NO : Go to Step 7.
STEP 7. Check harness between manifold
absolute pressure sensor connector terminal
and engine-ECU connector terminal MAP.
• Check output line for short circuit.
Q: Is the check result normal?
YES : Replace the manifold absolute pressure
sensor.
NO : Repair the damaged harness wire.
STEP 8. Perform voltage measurement at
engine-ECU connector.
• Disconnect engine-ECU harness, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspection.
• Ignition switch: "ON"
• Voltage between terminal MAP and body earth.
Altitude 0 m: 3.8 − 4.2 V
Altitude 600 m: 3.5 − 3.9 V
Altitude 1,200 m: 3.3 − 3.7 V
Altitude 1,800 m: 3.0 − 3.4 V
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or check
and repair harness between manifold
absolute pressure sensor connector
terminal and engine-ECU connector
terminal MAP.
• Check output line for open circuit and
damage.
Q: Is the check result normal?
Code No. P0108: Manifold Absolute Pressure Sensor Circuit High Input
OPERATION
• A power voltage of 5 V is applied to the manifold
absolute pressure sensor power terminal from
the engine-ECU connector terminal MAP5 and
earthed to the engine-ECU connector terminal
MAPE from the manifold absolute pressure sensor connector terminal.
• The sensor signal is inputted to the engine-ECU
connector terminal MAP from the manifold absolute pressure sensor output terminal.
13A-38
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
FUNCTION
• The manifold absolute pressure sensor detects a
change in inlet manifold pressure and inputs the
signal to the engine-ECU.
• In response to the signal, the engine-ECU corrects the fuel injection amount, etc.
TROUBLE JUDGMENT
Check Condition
• More than 8 minutes have passed since the
engine starting sequence was completed, when
the engine coolant temperature at engine start is
less than 0°C.
Judgement Criterion
• Manifold absolute pressure sensor output voltage
is more than 4.6 V (corresponding to a manifold
absolute pressure of 117 kPa or more) for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• Control as if the inlet manifold vacuum pressure
is 101 kPa.
PROBABLE CAUSES
• Failed manifold absolute pressure sensor
• Open circuit or harness damage in manifold
absolute pressure sensor circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 2. Perform resistance measurement at
manifold absolute pressure sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal engine-ECU MAPE
line and body earth.
OK: Continuity (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 3.
STEP 3. Check harness between manifold
absolute pressure sensor connector terminal
and engine-ECU connector terminal MAPE.
• Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 8: Manifold absolute pressure sensor
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 8: Manifold absolute pressure sensor
STEP 5. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 8: Manifold absolute pressure sensor
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 6.
STEP 6. Replace the manifold absolute pressure
sensor
• After replacing the manifold absolute pressure
sensor, reconfirm whether the diagnosis code is
set.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
13A-39
Code No. P0112: Intake Air Temperature Sensor Circuit Low Input
OPERATION
• A power voltage of 5 V is applied to the intake air
temperature sensor power terminal of air flow
sensor from the engine-ECU connector terminal
AFS5, ATS.
• The power voltage is earthed to the engine-ECU
connector terminal AFSE from the intake air temperature sensor connector terminal.
FUNCTION
• The intake air temperature sensor converts the
intake air temperature into a voltage and inputs
the voltage signal to the engine-ECU.
• In response to the signal, the engine-ECU corrects the fuel injection amount, etc.
• The intake air temperature sensor is a kind of
resistor, which has characteristics to reduce its
resistance as the intake air temperature rises.
Therefore, the sensor output voltage varies with
the intake air temperature, and becomes lower as
the intake air temperature rises.
TROUBLE JUDGMENT
Check Condition
• More than 2 seconds have passed since the
engine starting sequence was completed.
Judgement Criterion
• Intake air temperature sensor output voltage is
less than 0.2 V (corresponding to an intake air
temperature of 115°C or more) for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• Control as if the intake air temperature is 25°C.
PROBABLE CAUSES
• Failed intake air temperature sensor
• Short circuit in intake air temperature sensor circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Item 5: Intake air temperature sensor
OK: At ambient temperature (atmospheric
temperature) or equivalent.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Check intake air temperature sensor
itself.
• Air flow sensor connector check.
• Intake air temperature sensor check (Refer to
P.13A-185).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
the air flow sensor.
STEP 3. Perform voltage measurement at air flow
sensor connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU AFS5 or
ATS line and body earth.
OK: 4.5 − 4.9 V
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Check harness between air flow sensor
connector terminal and engine-ECU connector
terminal AFS5, ATS.
• Check power line for short circuit.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 5. M.U.T.-III data list
• Item 5: Intake air temperature sensor
OK: At ambient temperature (atmospheric
temperature) or equivalent.
Q: Is the check result normal?
13A-40
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
Code No. P0113: Intake Air Temperature Sensor Circuit High Input
OPERATION
• A power voltage of 5 V is applied to the intake air
temperature sensor power terminal of air flow
sensor connector from the engine-ECU connector terminal AFS5, ATS.
• The power voltage is earthed to the engine-ECU
connector terminal AFSE from the intake air temperature sensor connector terminal.
FUNCTION
• The intake air temperature sensor converts the
intake air temperature into a voltage and inputs
the voltage signal to the engine-ECU.
• In response to the signal, the engine-ECU corrects the fuel injection amount, etc.
• The intake air temperature sensor is a kind of
resistor, which has characteristics to reduce its
resistance as the intake air temperature rises.
Therefore, the sensor output voltage varies with
the intake air temperature, and becomes lower as
the intake air temperature rises.
TROUBLE JUDGMENT
Check Condition
• More than 2 seconds have passed since the
engine starting sequence was completed.
Judgement Criterion
• Intake air temperature sensor output voltage is
more than 4.6 V (corresponding to an intake air
temperature of −40°C or less) for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• Control as if the intake air temperature is 25°C.
PROBABLE CAUSES
• Failed intake air temperature sensor
• Open circuit or harness damage in intake air temperature sensor circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Item 5: Intake air temperature sensor
OK: At ambient temperature (atmospheric
temperature) or equivalent.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Check intake air temperature sensor
itself.
• Air flow sensor connector check.
• Intake air temperature sensor check (Refer to
P.13A-185).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
the air flow sensor.
STEP 3. Perform voltage measurement at air flow
sensor connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU AFS5 or
ATS line and body earth.
OK: 4.5 − 4.9 V
Q: Is the check result normal?
YES : Go to Step 6.
NO : Go to Step 4.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 4. Check harness between air flow sensor
connector terminal and engine-ECU connector
terminal AFS5, ATS.
• Check power line for open circuit.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 5. M.U.T.-III data list
• Item 5: Intake air temperature sensor
OK: At ambient temperature (atmospheric
temperature) or equivalent.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
13A-41
STEP 6. Perform resistance measurement at air
flow sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal engine-ECU AFSE
line and body earth.
OK: Continuity (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 8.
NO : Go to Step 7.
STEP 7. Check harness between air flow sensor
connector terminal and engine-ECU connector
terminal AFSE.
• Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 8. Check harness between air flow sensor
connector terminal and engine-ECU connector
terminal AFS5, ATS.
• Check power line for damage.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
Code No. P0117: Engine Coolant Temperature Sensor Circuit Low Input
OPERATION
• A power voltage of 5 V is applied to the engine
coolant temperature sensor power terminal from
the engine-ECU connector terminal WTS.
• The power voltage is earthed to the engine-ECU
connector terminal WTSE from the engine coolant temperature sensor connector terminal.
FUNCTION
• The engine coolant temperature sensor converts
the engine coolant temperature into a voltage signal, and inputs the voltage to the engine-ECU.
• In response to the signal, the engine-ECU controls the fuel injection amount and the fast idle
speed when the engine is cold state.
• The engine coolant temperature sensor is a kind
of resistor, which has characteristics to reduce its
resistance as the engine coolant temperature
rises. Therefore, the sensor output voltage varies
with the engine coolant temperature, and
becomes lower as the engine coolant temperature rises.
TROUBLE JUDGMENT
Check Condition
• More than 2 seconds have passed since the
engine starting sequence was completed.
Judgement Criterion
• Engine coolant temperature sensor output voltage is less than 0.1 V (corresponding to an
engine coolant temperature of 140°C or more) for
2 seconds.
13A-42
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
FAIL-SAFE AND BACKUP FUNCTION
• Control as if the engine coolant temperature is
80°C.
PROBABLE CAUSES
• Failed engine coolant temperature sensor
• Short circuit in engine coolant temperature sensor circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Item 6: Engine coolant temperature sensor
OK:
Engine cold state: At ambient temperature
(atmospheric temperature) or equivalent.
Engine hot state: At 80 − 120°C
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Perform resistance measurement at
engine coolant temperature sensor connector.
• Disconnect connector, and measure at sensor
side.
• Resistance between terminals.
OK:
Engine coolant temperature at −20°C: 14 − 17
kΩ
Engine coolant temperature at 0°C: 5.1 − 6.5
kΩ
Engine coolant temperature at 20°C: 2.1 − 2.7
kΩ
Engine coolant temperature at 40°C: 0.9 − 1.3
kΩ
Engine coolant temperature at 60°C: 0.48 −
0.68 kΩ
Engine coolant temperature at 80°C: 0.26 −
0.36 kΩ
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
the engine coolant temperature sensor.
STEP 3. Perform voltage measurement at engine
coolant temperature sensor connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU WTS line
and body earth.
OK: 4.5 − 4.9 V
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Check harness between engine coolant
temperature sensor connector terminal and
engine-ECU connector terminal WTS.
• Check power line for short circuit.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 5. M.U.T.-III data list
• Item 6: Engine coolant temperature sensor
OK:
Engine cold state: At ambient temperature
(atmospheric temperature) or equivalent.
Engine hot state: At 80 − 120 °C
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
Q: Is the check result normal?
Code No. P0118: Engine Coolant Temperature Sensor Circuit High Input
OPERATION
• A power voltage of 5 V is applied to the engine
coolant temperature sensor power terminal from
the engine-ECU connector terminal WTS.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
• The power voltage is earthed to the engine-ECU
connector terminal WTSE from the engine coolant temperature sensor connector terminal.
FUNCTION
• The engine coolant temperature sensor converts
the engine coolant temperature into a voltage signal, and inputs the voltage to the engine-ECU.
• In response to the signal, the engine-ECU controls the fuel injection amount and the fast idle
speed when the engine is cold state.
• The engine coolant temperature sensor is a kind
of resistor, which has characteristics to reduce its
resistance as the engine coolant temperature
rises. Therefore, the sensor output voltage varies
with the engine coolant temperature, and
becomes lower as the engine coolant temperature rises.
TROUBLE JUDGMENT
Check Condition
• More than 2 seconds have passed since the
engine starting sequence was completed.
Judgement Criterion
• Engine coolant temperature sensor output voltage is more than 4.6 V (corresponding to an
engine coolant temperature of −45°C or less) for
2 seconds.
13A-43
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Perform resistance measurement at
engine coolant temperature sensor connector.
• Disconnect connector, and measure at sensor
side.
• Resistance between terminals.
OK:
Engine coolant temperature at −20°C: 14 − 17
kΩ
Engine coolant temperature at 0°C: 5.1 − 6.5
kΩ
Engine coolant temperature at 20°C: 2.1 − 2.7
kΩ
Engine coolant temperature at 40°C: 0.9 − 1.3
kΩ
Engine coolant temperature at 60°C: 0.48 −
0.68 kΩ
Engine coolant temperature at 80°C: 0.26 −
0.36 kΩ
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
the engine coolant temperature sensor.
FAIL-SAFE AND BACKUP FUNCTION
• Control as if the engine coolant temperature is
80°C.
PROBABLE CAUSES
• Failed engine coolant temperature sensor
• Open circuit or harness damage in engine coolant temperature sensor circuit or loose connector
contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Item 6: Engine coolant temperature sensor
OK:
Engine cold state: At ambient temperature
(atmospheric temperature) or equivalent.
Engine hot state: At 80 − 120°C
Q: Is the check result normal?
STEP 3. Perform voltage measurement at engine
coolant temperature sensor connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU WTS line
and body earth.
OK: 4.5 − 4.9 V
Q: Is the check result normal?
YES : Go to Step 6.
NO : Go to Step 4.
STEP 4. Check harness between engine coolant
temperature sensor connector terminal and
engine-ECU connector terminal WTS.
• Check output line for open circuit.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
13A-44
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 5. M.U.T.-III data list
• Item 6: Engine coolant temperature sensor
OK:
Engine cold state: At ambient temperature
(atmospheric temperature) or equivalent.
Engine hot state: At 80 − 120 °C
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
STEP 6. Perform resistance measurement at
engine coolant temperature sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal engine-ECU WTSE
line and body earth.
OK: Continuity (2 Ω or less)
YES : Go to Step 8.
NO : Go to Step 7.
STEP 7. Check harness between engine coolant
temperature sensor connector terminal and
engine-ECU connector terminal WTSE.
• Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 8. Check harness between engine coolant
temperature sensor connector terminal and
engine-ECU connector terminal WTS.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
Q: Is the check result normal?
Code No. P0121: Trustful Check Throttle Position Sensor (main)
FUNCTION
• Compare the actual measurement of volumetric
efficiency by an air flow sensor signal with volumetric efficiency estimated from a throttle position
sensor (main) signal.
TROUBLE JUDGMENT
Check Conditions
• Difference between the actual volumetric efficiency and the volumetric efficiency estimated by
the throttle position sensor (main) is more than 0
%. Or, the volumetric efficiency is less than 60 %.
• Engine speed is more than 750 r/min and is less
than 3,000r/min. Or, the throttle position sensor
(main) output voltage is less than 3 V.
Judgement Criterion
• Difference between the actual volumetric efficiency and the volumetric efficiency estimated by
the throttle position sensor (main) is more than 33
%.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree is restricted.
• Throttle opening degree position is in default
position if throttle position sensor (sub) fails.
PROBABLE CAUSES
• Failed throttle position sensor (main)
• Harness damage in throttle position sensor
(main) circuit or loose connector contact
• Failed intake air system
• There is some foreign matter around air flow sensor
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is any other diagnosis code than P0121 set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 2. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 13: Throttle position sensor (main)
Q: Is the check result normal?
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Go to Step 3.
NO : Check throttle position sensor (main)
system. Check code No. P0122: throttle
position sensor (main) circuit low input
(Refer to P.13A-45). Check code No.
P0123: throttle position sensor (main) circuit
high input (Refer to P.13A-46).
13A-45
STEP 4. Check air flow sensor.
• Check that there is not foreign matter around air
flow sensor.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair.
STEP 3. Check air intake from inlet hose and inlet
manifold.
STEP 5. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P0122: Throttle Position Sensor (main) Circuit Low Input
OPERATION
• A power voltage of 5 V is applied to the electronic-controlled throttle valve connector terminal
from the engine-ECU connector terminal TPS5.
• The power voltage is earthed to the engine-ECU
connector terminal TPSE from the electronic-controlled throttle valve connector terminal.
• The sensor signal is inputted to the engine-ECU
connector terminal TPSM from the electronic-controlled throttle valve output terminal.
FUNCTION
• The throttle position sensor converts the throttle
valve position into voltage and inputs it into the
engine-ECU.
• The engine-ECU controls the throttle valve opening angle.
TROUBLE JUDGMENT
Check Condition
• Ignition switch is "ON" position.
Judgement Criterion
• Throttle position sensor (main) output voltage is
less than 0.2 V.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree is restricted.
• Throttle opening degree position is in default
position if throttle position sensor (sub) fails.
PROBABLE CAUSES
• Failed throttle position sensor (main)
• Short circuit or harness damage in throttle position sensor circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 13: Throttle position sensor (main)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
TPS5.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or repair
the damaged harness wire.
13A-46
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 3. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
TPSM.
• Check output line for short circuit.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 13: Throttle position sensor (main)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 5.
STEP 5. Replace the electronic-controlled
throttle valve
• After replacing the electronic-controlled throttle
valve, reconfirm whether the diagnosis code is
set.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
Code No. P0123: Throttle Position Sensor (main) Circuit High Input
OPERATION
• A power voltage of 5 V is applied to the electronic-controlled throttle valve connector terminal
from the engine-ECU connector terminal TPS5.
• The power voltage is earthed to the engine-ECU
connector terminal TPSE from the electronic-controlled throttle valve connector terminal.
• The sensor signal is inputted to the engine-ECU
connector terminal TPSM from the electronic-controlled throttle valve output terminal.
FUNCTION
• The throttle position sensor converts the throttle
valve position into voltage and inputs it into the
engine-ECU.
• The engine-ECU controls the throttle valve opening angle.
TROUBLE JUDGMENT
Check Condition
• Ignition switch is "ON" position.
Judgement Criterion
• Throttle position sensor (main) output voltage is
more than 4.8 V.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree is restricted.
• Throttle opening degree position is in default
position if throttle position sensor (sub) fails.
PROBABLE CAUSES
• Failed throttle position sensor (main)
• Open/short circuit or harness damage in throttle
position sensor circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 13: Throttle position sensor (main)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Perform voltage measurement at
electronic-controlled throttle valve connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU TPS5 line
and body earth.
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 3.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
13A-47
STEP 3. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
TPS5.
• Check power supply line for open/short circuit.
STEP 7. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
TPS5.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
Q: Is the check result normal?
YES : Go to Step 8.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 13: Throttle position sensor (main)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
STEP 5. Perform resistance measurement at
electronic-controlled throttle valve connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal engine-ECU TPSE
line and body earth.
OK: Continuity (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
TPSE.
• Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 8. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
TPSM.
• Check output line for open circuit and damage.
Q: Is the check result normal?
YES : Go to Step 9.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 9. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 13: Throttle position sensor (main)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 10.
STEP 10. Replace the electronic-controlled
throttle valve
• After replacing the electronic-controlled throttle
valve, reconfirm whether the diagnosis code is
set.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
the damaged harness wire.
Code No. P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control
OPERATION
• A power voltage of 5 V is applied to the engine
coolant temperature sensor power terminal from
the engine-ECU connector terminal WTS.
• The power voltage is earthed to the engine-ECU
connector terminal WTSE from the engine coolant temperature sensor connector terminal.
13A-48
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
FUNCTION
• The engine coolant temperature sensor converts
the engine coolant temperature into a voltage signal, and inputs the voltage to the engine-ECU.
• In response to the signal, the engine-ECU controls the fuel injection amount and the fast idle
speed when the engine is cold state.
• The engine coolant temperature sensor is a kind
of resistor, which has characteristics to reduce its
resistance as the engine coolant temperature
rises. Therefore, the sensor output voltage varies
with the engine coolant temperature, and
becomes lower as the engine coolant temperature rises.
TROUBLE JUDGMENT
Check Conditions, Judgement Criteria
• While engine is running.
• Engine coolant temperature decreases from
more than 40°C to less than 40°C.
• Then the engine coolant temperature is less than
40°C for 5 minutes.
FAIL-SAFE AND BACKUP FUNCTION
• Control as if the engine coolant temperature is
80°C.
PROBABLE CAUSES
• Failed engine coolant temperature sensor
• Harness damage in engine coolant temperature
sensor circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Item 6: Engine coolant temperature sensor
OK:
Engine cold state: At ambient temperature
(atmospheric temperature) or equivalent.
Engine hot state: At 80 − 120°C
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Perform resistance measurement at
engine coolant temperature sensor connector.
• Disconnect connector, and measure at sensor
side.
• Resistance between terminals.
OK:
Engine coolant temperature at −20°C: 14 − 17
kΩ
Engine coolant temperature at 0°C: 5.1 − 6.5
kΩ
Engine coolant temperature at 20°C: 2.1 − 2.7
kΩ
Engine coolant temperature at 40°C: 0.9 − 1.3
kΩ
Engine coolant temperature at 60°C: 0.48 −
0.68 kΩ
Engine coolant temperature at 80°C: 0.26 −
0.36 kΩ
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
the engine coolant temperature sensor.
STEP 3. Perform voltage measurement at engine
coolant temperature sensor connector.
• Use special tool test harness (MB991709) to connect connector, and measure at pick-up harness.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU WTS line
and body earth.
OK:
Engine coolant temperature at −20°C: 3.9 − 4.5
V
Engine coolant temperature at 0°C: 3.2 − 3.8 V
Engine coolant temperature at 20°C: 2.3 − 2.9
V
Engine coolant temperature at 40°C: 1.3 − 1.9
V
Engine coolant temperature at 60°C: 0.7 − 1.3
V
Engine coolant temperature at 80°C: 0.3 − 0.9
V
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Check harness between engine coolant
temperature sensor connector terminal and
engine-ECU connector terminal WTS.
• Check power line for damage.
Q: Is the check result normal?
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 5. Check harness between engine coolant
temperature sensor connector terminal and
engine-ECU connector terminal WTSE.
• Check earthing line for damage.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
the damaged harness wire.
13A-49
STEP 6. M.U.T.-III data list
• Item 6: Engine coolant temperature sensor
OK:
Engine cold state: At ambient temperature
(atmospheric temperature) or equivalent.
Engine hot state: At 80 − 120 °C
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
Code No. P0131: Oxygen Sensor (front) Circuit Low Voltage
OPERATION
• The sensor signal is inputted to the engine-ECU
connector terminal O2FL from the oxygen sensor
(front) output terminal.
• The oxygen sensor (front) connector terminal is
earthed with engine-ECU connector terminal
OFLE.
FUNCTION
• The oxygen sensor (front) converts the concentration of oxygen in the exhaust emission into a
voltage and inputs the signal to the engine-ECU.
• When the air-fuel ratio is richer than the theoretical air-fuel ratio, the oxygen sensor (front) outputs a voltage of about 1 V. When it is leaner than
the theoretical air-fuel ratio, it outputs a voltage of
about 0 V.
• In response to the signal, the engine-ECU controls the fuel injection amount so that the air-fuel
ratio can be equivalent to the theoretical air-fuel
ratio.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed oxygen sensor (front)
• Open/short circuit or harness damage in oxygen
sensor (front) circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item AC: Oxygen sensor (front)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
TROUBLE JUDGMENT
Check Conditions
• More than 1 minute have passed since the
engine starting sequence was completed.
• Battery positive voltage is more than 11 V and is
less than 16.5 V.
• Oxygen sensor (front) offset voltage is more than
0.4 V and is less than 0.6 V.
Judgement Criterion
• Oxygen sensor (front) output voltage is less than
0.2 V for 2 seconds.
STEP 2. Perform voltage measurement at oxygen
sensor (front) connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU OFLE line
and body earth.
OK: 0.4 − 0.6 V
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 3.
13A-50
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 3. Check harness between oxygen sensor
(front) connector terminal and engine-ECU
connector terminal OFLE.
• Check earthing line for open/short circuit.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item AC: Oxygen sensor (front)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
STEP 5. Check harness between oxygen sensor
(front) connector terminal and engine-ECU
connector terminal OFLE.
• Check earthing line for damage.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
STEP 6. Perform voltage measurement at oxygen
sensor (front) connector.
• Use special tool test harness (MB991658) to connect connector, and measure at pick-up harness.
• Engine: After warm-up
• Transmission: P range
• Voltage between terminal engine-ECU O2FL line
and earth.
OK:
When the engine is 2,500 r/min, the output
voltage should repeat 0.9 V or less ⇔ 1.1 to
1.5 V alternately.
Q: Is the check result normal?
YES : Go to Step 8.
NO : Go to Step 7.
STEP 7. Check oxygen sensor (front) itself.
• Oxygen sensor check (Refer to P.13A-186).
Q: Is the check result normal?
YES : Repair or replace the connector, or check
intermediate connector, and repair if
necessary. If intermediate connector is
normal, check and repair harness between
oxygen sensor (front) connector terminal
and engine-ECU connector terminal O2FL.
• Check output line for short circuit.
NO : Replace oxygen sensor (front).
the damaged harness wire.
STEP 8. Check harness between oxygen sensor
(front) connector terminal and engine-ECU
connector terminal O2FL.
• Check output line for open circuit and damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair the damaged harness wire.
Code No. P0132: Oxygen Sensor (front) Circuit High Voltage
OPERATION
• The sensor signal is inputted to the engine-ECU
connector terminal O2FL from the oxygen sensor
(front) output terminal.
• The oxygen sensor (front) connector terminal is
earthed with engine-ECU connector terminal
OFLE.
FUNCTION
• The oxygen sensor (front) converts the concentration of oxygen in the exhaust emission into a
voltage and inputs the signal to the engine-ECU.
• When the air-fuel ratio is richer than the theoretical air-fuel ratio, the oxygen sensor (front) outputs a voltage of about 1 V. When it is leaner than
the theoretical air-fuel ratio, it outputs a voltage of
about 0 V.
• In response to the signal, the engine-ECU controls the fuel injection amount so that the air-fuel
ratio can be equivalent to the theoretical air-fuel
ratio.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
TROUBLE JUDGMENT
Check Conditions
• Oxygen sensor (front) offset voltage is more than
0.4 V and is less than 3.8 V.
• More than 2 seconds have passed since the
engine starting sequence was completed.
Judgement Criterion
• Oxygen sensor (front) output voltage is more than
1.2 V for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Short circuit in oxygen sensor (front) circuit or
loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item AC: Oxygen sensor (front)
Q: Are the check results normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
13A-51
STEP 2. Check harness between oxygen sensor
(front) connector terminal and engine-ECU
connector terminal O2FL.
• Check output line for short circuit.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 3. Check harness between oxygen sensor
(front) connector terminal and engine-ECU
connector terminal OFLE.
• Check earthing line for short circuit.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item AC: Oxygen sensor (front)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
Code No. P0133: Oxygen Sensor (front) Circuit Slow Response
OPERATION
• The sensor signal is inputted to the engine-ECU
connector terminal O2FL from the oxygen sensor
(front) output terminal.
• The oxygen sensor (front) connector terminal is
earthed with engine-ECU connector terminal
OFLE.
FUNCTION
• The oxygen sensor (front) converts the concentration of oxygen in the exhaust emission into a
voltage and inputs the signal to the engine-ECU.
• When the air-fuel ratio is richer than the theoretical air-fuel ratio, the oxygen sensor (front) outputs a voltage of about 1 V. When it is leaner than
the theoretical air-fuel ratio, it outputs a voltage of
about 0 V.
• In response to the signal, the engine-ECU controls the fuel injection amount so that the air-fuel
ratio can be equivalent to the theoretical air-fuel
ratio.
TROUBLE JUDGMENT
Check Conditions
• Engine coolant temperature is more than 60°C.
• Engine speed is more than 1,200 r/min and is
less than 3,000 r/min. <4B11>
• Engine speed is more than 1,100 r/min and is
less than 3,000 r/min. <4B12>
• Volumetric efficiency is more than 27 % and is
less than 65 %. <4B11>
• Volumetric efficiency is more than 18 % and is
less than 60 %. <4B12>
• Under the closed loop air/fuel control.
13A-52
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
• The accelerator pedal is open.
• Short-term fuel trim is more than −25 % and is
less than +25 %.
• More than 2 seconds have elapsed after the
above mentioned conditions have been met.
• The engine-ECU monitors for this condition for 7
cycles of 10 seconds each during the drive cycle.
Judgement Criterion
• The average of the oxygen sensor (front)
rich/lean switching frequency is less than 6 times
per 10 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed oxygen sensor (front)
• Loose connector contact
• Failed engine-ECU
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Check oxygen sensor (front) itself.
• Oxygen sensor (front) check (Refer to
P.13A-186).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Replace oxygen sensor (front).
STEP 3. Connector check: oxygen sensor (front)
connector and engine-ECU connector
Q: Are the check results normal?
YES : Go to Step 4.
NO : Repair or replace the connector.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item AC: Oxygen sensor (front)
Q: Is the check result normal?
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item AC: Oxygen sensor (front)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
Code No. P0134: Oxygen Sensor (front) Circuit No Activity Detected
OPERATION
• Check code No. P0131: oxygen sensor (front) circuit low voltage (Refer to P.13A-49).
• Check code No. P0261: No. 1 injector circuit low
input (Refer to P.13A-62).
• Check code No. P0262: No. 1 injector circuit high
input (Refer to P.13A-63).
• Check code No. P0264: No. 2 injector circuit low
input (Refer to P.13A-64).
• Check code No. P0265: No. 2 injector circuit high
input (Refer to P.13A-65).
• Check code No. P0267: No. 3 injector circuit low
input (Refer to P.13A-66).
• Check code No. P0268: No. 3 injector circuit high
input (Refer to P.13A-67).
• Check code No. P0270: No. 4 injector circuit low
input (Refer to P.13A-68).
• Check code No. P0271: No. 4 injector circuit high
input (Refer to P.13A-69).
FUNCTION
• The oxygen sensor (front) converts the concentration of oxygen in the exhaust emission into a
voltage and inputs the signal to the engine-ECU.
• When the air-fuel ratio is richer than the theoretical air-fuel ratio, the oxygen sensor (front) outputs a voltage of about 1 V. When it is leaner than
the theoretical air-fuel ratio, it outputs a voltage of
about 0 V.
• In response to the signal, the engine-ECU controls the fuel injection amount so that the air-fuel
ratio can be equivalent to the theoretical air-fuel
ratio.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
TROUBLE JUDGMENT
Check Conditions
• Typically 20 seconds have passed since the
engine starting sequence was completed.
• Engine coolant temperature is more than 76°C.
<4B11>
• Engine coolant temperature is more than 60°C.
<4B12>
• Engine speed is more than 1,188 r/min.
• Volumetric efficiency is more than 30 %.
• Except while fuel is being shut off.
• Monitoring time: 30 seconds.
Judgement Criterion
• Oxygen sensor (front) output voltage does not
get across lean/rich criteria (about 0.5 V) within
about 30 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
•
•
•
•
•
•
•
•
Failed oxygen sensor (front)
Harness damage in oxygen sensor (front) circuit
Failed injector
Harness damage in injector circuit
Exhaust leak
Air drawn in from gaps in gasket, seal, etc.
Incorrect fuel pressure
Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item AC: Oxygen sensor (front)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Check for exhaust leaks.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair.
YES : Go to Step 4.
NO : Repair.
STEP 4. Check oxygen sensor (front) itself.
• Oxygen sensor (front) connector check.
• Oxygen sensor (front) check (Refer to
P.13A-186).
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or replace
the oxygen sensor (front).
STEP 5. Check injector itself.
• No.1, No.2, No.3, No.4 injector connector check.
• Injector check (Refer to P.13A-188).
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or replace
the injector.
STEP 6. Check harness between oxygen sensor
(front) connector terminal and engine-ECU
connector terminal O2FL.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 7. Check harness between injector
connector and engine-ECU connector.
a. Check and repair harness between No. 1 injector
connector terminal and engine-ECU connector
terminal INJ1.
b. Check and repair harness between No. 2 injector
connector terminal and engine-ECU connector
terminal INJ2.
c. Check and repair harness between No. 3 injector
connector terminal and engine-ECU connector
terminal INJ3.
d. Check and repair harness between No. 4 injector
connector terminal and engine-ECU connector
terminal INJ4.
• Check output line for damage.
Q: Are the check result normal?
YES : Go to Step 8.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 3. Check for intake system vacuum leak.
Q: Is the check result normal?
13A-53
13A-54
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 8. Fuel pressure measurement.
• Fuel pressure test (Refer to P.13A-179).
YES : Replace the engine-ECU.
NO : Repair.
Q: Is the check result normal?
Code No. P0137: Oxygen Sensor (rear) Circuit Low Voltage
OPERATION
• The sensor signal is inputted to the engine-ECU
connector terminal O2RL from the oxygen sensor
(rear) output terminal.
• The oxygen sensor (rear) connector terminal is
earthed with engine-ECU connector terminal
ORLE.
FUNCTION
• The oxygen sensor (rear) converts the concentration of oxygen in the exhaust emission into a voltage and inputs the signal to the engine-ECU.
• When the air-fuel ratio is richer than the theoretical air-fuel ratio, the oxygen sensor (rear) outputs
a voltage of about 1 V. When it is leaner than the
theoretical air-fuel ratio, it outputs a voltage of
about 0 V.
• In response to the signal, the engine-ECU controls the fuel injection amount so that the air-fuel
ratio can be equivalent to the theoretical air-fuel
ratio.
TROUBLE JUDGMENT
Check Conditions
• Oxygen sensor (rear) offset voltage is more than
0.4 V and is less than 0.6 V.
• Battery positive voltage is more than 11 V and is
less than 16.5 V.
• More than 5 minutes have passed since the
engine starting sequence was completed.
Judgement Criterion
• Oxygen sensor (rear) output voltage is less than
0.2 V for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item AD: Oxygen sensor (rear)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Perform voltage measurement at oxygen
sensor (rear) connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU ORLE line
and body earth.
OK: 0.4 − 0.6 V
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 3.
STEP 3. Check harness between oxygen sensor
(rear) connector terminal and engine-ECU
connector terminal ORLE.
• Check earthing line for open circuit.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
• None
PROBABLE CAUSES
• Failed oxygen sensor (rear)
• Open/short circuit or harness damage in oxygen
sensor (rear) circuit or loose connector contact
• Failed engine-ECU
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item AD: Oxygen sensor (rear)
Q: Is the check result normal?
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 5. Check harness between oxygen sensor
(rear) connector terminal and engine-ECU
connector terminal ORLE.
• Check earthing line for damage.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 6. Perform voltage measurement at oxygen
sensor (rear) connector.
• Use special tool test harness (MB991658) to connect connector, and measure at pick-up harness.
• Transmission: 2nd speed
• Drive with wide open throttle
• Engine: 3,500 r/min or more
• Voltage between terminal engine-ECU O2RL line
and body earth.
OK:
The output voltage should be 1.1 − 1.5 V.
Q: Is the check result normal?
13A-55
YES : Go to Step 8.
NO : Go to Step 7.
STEP 7. Check oxygen sensor (rear) itself.
• Oxygen sensor check (Refer to P.13A-186).
Q: Is the check result normal?
YES : Repair or replace the connector, or check
intermediate connectors, and repair if
necessary. If intermediate connectors are
normal, check and repair harness between
oxygen sensor (rear) connector terminal
and engine-ECU connector terminal O2RL.
• Check output line for short circuit.
NO : Replace oxygen sensor (rear).
STEP 8. Check harness between oxygen sensor
(rear) connector terminal and engine-ECU
connector terminal O2RL.
• Check output line for open circuit and damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair the damaged harness wire.
Code No. P0138: Oxygen Sensor (rear) Circuit High Voltage
OPERATION
• The sensor signal is inputted to the engine-ECU
connector terminal O2RL from the oxygen sensor
(rear) output terminal.
• The oxygen sensor (rear) connector terminal is
earthed with engine-ECU connector terminal
ORLE.
FUNCTION
• The oxygen sensor (rear) converts the concentration of oxygen in the exhaust emission into a voltage and inputs the signal to the engine-ECU.
• When the air-fuel ratio is richer than the theoretical air-fuel ratio, the oxygen sensor (rear) outputs
a voltage of about 1 V. When it is leaner than the
theoretical air-fuel ratio, it outputs a voltage of
about 0 V.
• In response to the signal, the engine-ECU controls the fuel injection amount so that the air-fuel
ratio can be equivalent to the theoretical air-fuel
ratio.
TROUBLE JUDGMENT
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• Oxygen sensor (rear) offset voltage is more than
0.4 V and is less than 3.8 V.
Judgement Criterion
• Oxygen sensor (rear) output voltage is more than
1.2 V for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed oxygen sensor (rear)
• Short circuit in oxygen sensor (rear) circuit or
loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item AD: Oxygen sensor (rear)
Q: Are the check results normal?
13A-56
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Check harness between oxygen sensor
(rear) connector terminal and engine-ECU
connector terminal O2RL.
• Check output line for short circuit.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 3. Check harness between oxygen sensor
(rear) connector terminal and engine-ECU
connector terminal ORLE.
• Check earthing line for short circuit.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item AD: Oxygen sensor (rear)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
Code No. P0171: Abnormal Fuel System (lean)
OPERATION
• Check code No. P0261: No. 1 injector circuit low
input (Refer to P.13A-62).
• Check code No. P0262: No. 1 injector circuit high
input (Refer to P.13A-63).
• Check code No. P0264: No. 2 injector circuit low
input (Refer to P.13A-64).
• Check code No. P0265: No. 2 injector circuit high
input (Refer to P.13A-65).
• Check code No. P0267: No. 3 injector circuit low
input (Refer to P.13A-66).
• Check code No. P0268: No. 3 injector circuit high
input (Refer to P.13A-67).
• Check code No. P0270: No. 4 injector circuit low
input (Refer to P.13A-68).
• Check code No. P0271: No. 4 injector circuit high
input (Refer to P.13A-69).
FUNCTION
• If the fuel system goes out of order, the fuel correction value will become larger.
• The engine-ECU checks whether the fuel trim
value is within a specified range.
TROUBLE JUDGMENT
Check Conditions
• Engine coolant temperature is less than 100°C
when the engine is started.
• Intake air temperature is less than 60°C when the
engine is started.
• Under the closed loop air/fuel ratio control.
• Engine coolant temperature is more than 76°C.
• Air flow sensor output is more than 6.4 g/sec.
Judgement Criterion
• Long-term fuel trim is more than +12.5 % for 5
seconds.
or
• Short-term fuel trim is more than +7.0 % for 5
seconds. <4B11>
• Short-term fuel trim is more than +10.0 % for 5
seconds. <4B12>
Check Conditions
• Engine coolant temperature is more than 100°C
when the engine is started.
• Intake air temperature is more than 60°C when
the engine is started.
• Under the closed loop air/fuel ratio control.
• Engine coolant temperature is more than 76°C.
• Air flow sensor output is more than 6.4 g/sec.
Judgement Criterion
• Long-term fuel trim is more than +12.5 % for 5
seconds.
or
• Short-term fuel trim is more than +17.2 % for 5
seconds. <4B11>
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
• Short-term fuel trim is more than +19.9 % for 5
seconds. <4B12>
Check Conditions
• Engine coolant temperature is more than 76°C.
• Under the closed loop air/fuel ratio control.
Judgement Criterion
• Long-term fuel trim is +12.5 % for 2 seconds.
or
• Short-term fuel trim is +25.0 % for 2 seconds.
13A-57
STEP 3. Check for exhaust leaks
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair.
STEP 4. Check for intake system vacuum leaks.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
•
•
•
•
•
•
•
•
•
•
•
Failed intake air temperature sensor
Failed air flow sensor
Failed injector
Air drawn in from gaps in gasket, seals, etc.
Failed engine coolant temperature sensor
Failed manifold absolute pressure sensor
Failed barometric pressure sensor
Exhaust leak
Incorrect fuel pressure
Use of incorrect or contaminated fuel
Harness damage in injector circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is any other diagnosis code than P0171 set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 2. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 5: Intake air temperature sensor
b. Item 6: Engine coolant temperature sensor
c. Item 8: Manifold absolute pressure sensor
d. Item 10: Air flow sensor
e. Item BB: Barometric pressure sensor
Q: Are the check results normal?
YES : Go to Step 3.
NO : Perform the diagnosis code classified check
procedure for the sensor that has shown an
abnormal data value. Inspection chart for
diagnosis code (Refer to P.13A-23).
STEP 5. Check injector itself.
• No. 1 injector connector.
• No. 2 injector connector.
• No. 3 injector connector.
• No. 4 injector connector.
• Injector check (Refer to P.13A-188).
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector or replace
the injector.
STEP 6. Check harness between injector
connector and engine-ECU connector.
a. Check and repair harness between No. 1 injector
connector terminal and engine-ECU connector
terminal INJ1.
b. Check and repair harness between No. 2 injector
connector terminal and engine-ECU connector
terminal INJ2.
c. Check and repair harness between No. 3 injector
connector terminal and engine-ECU connector
terminal INJ3.
d. Check and repair harness between No. 4 injector
connector terminal and engine-ECU connector
terminal INJ4.
• Check output line for damage.
Q: Are the check results normal?
YES : Go to Step 7.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 7. Fuel pressure measurement.
• Fuel pressure test (Refer to P.13A-179).
Q: Is the check result normal?
YES : Go to Step 8.
NO : Repair.
13A-58
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 8. Check fuel.
• Check for entry of foreign matter (water, diesel
fuel, etc.) into fuel.
STEP 9. Replace the injector.
• After replacing the injector, reconfirm whether the
diagnosis code is set.
Q: Is the check result normal?
YES : Go to Step 9.
NO : Replace the fuel.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
Code No. P0172: Abnormal Fuel System (rich)
OPERATION
• Check code No. P0261: No. 1 injector circuit low
input (Refer to P.13A-62).
• Check code No. P0262: No. 1 injector circuit high
input (Refer to P.13A-63).
• Check code No. P0264: No. 2 injector circuit low
input (Refer to P.13A-64).
• Check code No. P0265: No. 2 injector circuit high
input (Refer to P.13A-65).
• Check code No. P0267: No. 3 injector circuit low
input (Refer to P.13A-66).
• Check code No. P0268: No. 3 injector circuit high
input (Refer to P.13A-67).
• Check code No. P0270: No. 4 injector circuit low
input (Refer to P.13A-68).
• Check code No. P0271: No. 4 injector circuit high
input (Refer to P.13A-69).
FUNCTION
• If the fuel system goes out of order, the fuel correction value will become larger.
• The engine-ECU checks whether the fuel trim
value is within a specified range.
TROUBLE JUDGMENT
Check Conditions
• Under the closed loop air/fuel ratio control.
• Engine coolant temperature is more than 76°C.
Judgement Criterion
• Long-term fuel trim is less than −12.5 % for 5 seconds.
or
• Short-term fuel trim is less than −10.2 % for 5
seconds.
Check Conditions
• Engine coolant temperature is more than 76°C.
• Under the closed loop air/fuel ratio control.
Judgement Criterion
• Long-term fuel trim is −12.5 % for 2 seconds.
or
• Short-term fuel trim is −25.0 % for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
•
•
•
•
•
•
•
•
Failed intake air temperature sensor
Failed air flow sensor
Failed injector
Failed engine coolant temperature sensor
Failed manifold absolute pressure sensor
Failed barometric pressure sensor
Incorrect fuel pressure
Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is any other diagnosis code than P0172 set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 2. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 5: Intake air temperature sensor
b. Item 6: Engine coolant temperature sensor
c. Item 8: Manifold absolute pressure sensor
d. Item 10: Air flow sensor
e. Item BB: Barometric pressure sensor
Q: Are the check results normal?
YES : Go to Step 3.
NO : Perform the diagnosis code classified check
procedure for the sensor that has shown an
abnormal data value. Inspection chart for
diagnosis code (Refer to P.13A-23).
STEP 3. Check injector itself.
• Injector check (Refer to P.13A-188).
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the injector.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 4. Fuel pressure measurement.
• Fuel pressure test (Refer to P.13A-179).
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair.
13A-59
STEP 5. Replace the injector.
• After replacing the injector, reconfirm whether the
diagnosis code is set.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
Code No. P0221: Trustful Check Throttle Position Sensor (sub)
FUNCTION
• Compare the actual measurement of volumetric
efficiency by an air flow sensor signal with volumetric efficiency estimated from a throttle position
sensor (sub) signal.
TROUBLE JUDGMENT
Check Conditions
• Difference between the actual volumetric efficiency and the volumetric efficiency estimated by
the throttle position sensor (sub) is more than 0
%. Or, the volumetric efficiency is less than 60 %.
• Engine speed is more than 750 r/min and is less
than 3,000 r/min. Or, the throttle position sensor
(sub) output voltage is less than 3 V.
Judgement Criterion
• Difference between the actual volumetric efficiency and the volumetric efficiency estimated by
the throttle position sensor (sub) is more than 33
%.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree is restricted.
• Throttle opening degree position is in default
position if throttle position sensor (main) fails.
PROBABLE CAUSES
• Failed throttle position sensor (sub)
• Harness damage in throttle position sensor (sub)
circuit or loose connector contact
• Failed intake air system
• There is some foreign matter around air flow sensor.
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is any other diagnosis code than P0221 set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 2. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 15: Throttle position sensor (sub)
Q: Is the check result normal?
YES : Go to Step 3.
NO : Check throttle position sensor (sub) system.
Check code No. P0222: throttle position
sensor (sub) circuit low input (Refer to
P.13A-60). Check code No. P0223: throttle
position sensor (sub) circuit high input
(Refer to P.13A-61).
STEP 3. Check air intake from inlet hose and inlet
manifold.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair.
STEP 4. Check air flow sensor.
• Check that there is not foreign matter around air
flow sensor.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair.
STEP 5. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
13A-60
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
Code No. P0222: Throttle Position Sensor (sub) Circuit Low Input
OPERATION
• A power voltage of 5 V is applied to the electronic-controlled throttle valve connector terminal
from the engine-ECU connector terminal TPS5.
• The power voltage is earthed to the engine-ECU
connector terminal TPSE from the electronic-controlled throttle valve connector terminal.
• The sensor signal is inputted to the engine-ECU
connector terminal TPSS from the electronic-controlled throttle valve output terminal.
FUNCTION
• The throttle position sensor converts the throttle
valve position into voltage and inputs it into the
engine-ECU.
• The engine-ECU controls the throttle valve opening angle.
TROUBLE JUDGMENT
Check Condition
• Ignition switch is "ON" position.
Judgement Criterion
• Throttle position sensor (sub) output voltage is
less than 0.2 V.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree is restricted.
• Throttle opening degree position is in default
position if throttle position sensor (main) fails.
PROBABLE CAUSES
• Failed throttle position sensor (sub)
• Open/short circuit or harness damage in throttle
position sensor (sub) circuit or loose connector
contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 15: Throttle position sensor (sub)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Perform voltage measurement at
electronic-controlled throttle valve connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU TPS5 line
and body earth.
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 3.
STEP 3. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
TPS5.
• Check power supply line for open/short circuit.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 15: Throttle position sensor (sub)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
STEP 5. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
TPS5.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
the damaged harness wire.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 6. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
TPSS.
• Check output line for open/short circuit and damage.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair or replace the connector, or repair
13A-61
STEP 7. Replace the electronic-controlled
throttle valve
• After replacing the electronic-controlled throttle
valve, reconfirm whether the diagnosis code is
set.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
the damaged harness wire.
Code No. P0223: Throttle Position Sensor (sub) Circuit High Input
OPERATION
• A power voltage of 5 V is applied to the electronic-controlled throttle valve connector terminal
from the engine-ECU connector terminal TPS5.
• The power voltage is earthed to the engine-ECU
connector terminal TPSE from the electronic-controlled throttle valve connector terminal.
• The sensor signal is inputted to the engine-ECU
connector terminal TPSS from the electronic-controlled throttle valve output terminal.
FUNCTION
• The throttle position sensor converts the throttle
valve position into voltage and inputs it into the
engine-ECU.
• The engine-ECU controls the throttle valve opening angle.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 15: Throttle position sensor (sub)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
Check Condition
• Ignition switch is "ON" position.
STEP 2. Perform resistance measurement at
electronic-controlled throttle valve connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal engine-ECU TPSE
line and body earth.
OK: Continuity (2 Ω or less)
Judgement Criterion
• Throttle position sensor (sub) output voltage is
more than 4.8 V.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 3.
TROUBLE JUDGMENT
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree is restricted.
• Throttle opening degree position is in default
position if throttle position sensor (main) fails.
PROBABLE CAUSES
• Failed throttle position sensor (sub)
• Open circuit and harness damage in throttle position sensor (sub) circuit or loose connector contact
• Failed engine-ECU
STEP 3. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
TPSE.
• Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
13A-62
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 15: Throttle position sensor (sub)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
STEP 5. Replace the electronic-controlled
throttle valve
• After replacing the electronic-controlled throttle
valve, reconfirm whether the diagnosis code is
set.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
Code No. P0261: No. 1 Injector Circuit Low Input
OPERATION
• Power is supplied to the injector connector terminal from the engine control relay connector terminal.
• The engine-ECU connector terminal INJ1 makes
the power transistor in the unit be in ON position,
and that makes currents go on the injector connector terminal.
FUNCTION
• The engine-ECU controls the power supply interval of the injector.
• The fuel injection amount of the injector depends
on the power supply interval.
TROUBLE JUDGMENT
Check Condition
• Engine is running.
Judgement Criterion
• The supply voltage is less than 3 V without the
injector driving.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed No. 1 injector
• Open/short circuit or harness damage in No. 1
injector circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III actuator test
• Item 1: No. 1 injector
OK: Idling state varies.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Check No. 1 injector itself.
• No. 1 Injector connector check.
• Injector check (Refer to P.13A-188).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
the No. 1 injector.
STEP 3. Perform voltage measurement at No. 1
injector connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal power supply line and
body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Check harness between engine control
relay connector terminal and No. 1 injector
connector terminal power supply line.
• Check power supply line for damage.
Q: Is the check result normal?
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 5. Check harness between No. 1 injector
connector terminal and engine-ECU connector
terminal INJ1.
• Check output line for open/short circuit and damage.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
the damaged harness wire.
13A-63
STEP 6. Perform signal wave pattern
measurement at engine-ECU connector (Using
an oscilloscope).
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspection.
• Engine: Idling
• Transmission: P range
• Voltage between terminal INJ1 and body earth.
OK: Waveforms should be displayed on
inspection procedure using an oscilloscope
(Refer to P.13A-174).
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
Code No. P0262: No. 1 Injector Circuit High Input
OPERATION
• Power is supplied to the injector connector terminal from the engine control relay connector terminal.
• The engine-ECU connector terminal INJ1 makes
the power transistor in the unit be in ON position,
and that makes currents go on the injector connector terminal.
FUNCTION
• The engine-ECU controls the power supply interval of the injector.
• The fuel injection amount of the injector depends
on the power supply interval.
TROUBLE JUDGMENT
Check Condition
• Engine is running.
Judgement Criterion
• The coil current is more than 4.5 A with the injector driving.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed No. 1 injector
• Open/short circuit or harness damage in No. 1
injector circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III actuator test
• Item 1: No. 1 injector
OK: Idling state varies.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Check No. 1 injector itself.
• No. 1 Injector connector check.
• Injector check (Refer to P.13A-188).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Replace the No. 1 injector.
13A-64
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 3. Check harness between No. 1 injector
connector terminal and engine-ECU connector
terminal INJ1.
• Check output line for open/short circuit and damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. Perform signal wave pattern
measurement at engine-ECU connector (Using
an oscilloscope).
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspection.
• Engine: Idling
• Transmission: P range
• Voltage between terminal INJ1 and body earth.
OK: Waveforms should be displayed on
inspection procedure using an oscilloscope
(Refer to P.13A-174).
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
Code No. P0264: No. 2 Injector Circuit Low Input
OPERATION
• Power is supplied to the injector connector terminal from the engine control relay connector terminal.
• The engine-ECU connector terminal INJ2 makes
the power transistor in the unit be in ON position,
and that makes currents go on the injector connector terminal.
FUNCTION
• The engine-ECU controls the power supply interval of the injector.
• The fuel injection amount of the injector depends
on the power supply interval.
TROUBLE JUDGMENT
Check Condition
• Engine is running.
Judgement Criterion
• The supply voltage is less than 3 V without the
injector driving.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed No. 2 injector
• Open/short circuit or harness damage in No. 2
injector circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III actuator test
• Item 1: No. 2 injector
OK: Idling state varies.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Check No. 2 injector itself.
• No. 2 Injector connector check.
• Injector check (Refer to P.13A-188).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
the No. 2 injector.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 3. Perform voltage measurement at No. 2
injector connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal power supply line and
body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Check harness between engine control
relay connector terminal and No. 2 injector
connector terminal power supply line.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 5. Check harness between No. 2 injector
connector terminal and engine-ECU connector
terminal INJ2.
• Check output line for open/short circuit and damage.
13A-65
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 6. Perform signal wave pattern
measurement at engine-ECU connector (Using
an oscilloscope).
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspection.
• Engine: Idling
• Transmission: P range
• Voltage between terminal INJ2 and body earth.
OK: Waveforms should be displayed on
inspection procedure using an oscilloscope
(Refer to P.13A-174).
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
Q: Is the check result normal?
Code No. P0265: No. 2 Injector Circuit High Input
OPERATION
• Power is supplied to the injector connector terminal from the engine control relay connector terminal.
• The engine-ECU connector terminal INJ2 makes
the power transistor in the unit be in ON position,
and that makes currents go on the injector connector terminal.
FUNCTION
• The engine-ECU controls the power supply interval of the injector.
• The fuel injection amount of the injector depends
on the power supply interval.
TROUBLE JUDGMENT
Check Condition
• Engine is running.
Judgement Criterion
• The coil current is more than 4.5 A with the injector driving.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed No. 2 injector
• Open/short circuit or harness damage in No. 2
injector circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III actuator test
• Item 1: No. 2 injector
OK: Idling state varies.
Q: Is the check result normal?
13A-66
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Check No. 2 injector itself.
• No. 2 Injector connector check.
• Injector check (Refer to P.13A-188).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
the No. 2 injector.
STEP 3. Check harness between No. 2 injector
connector terminal and engine-ECU connector
terminal INJ2.
• Check output line for open/short circuit and damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. Perform signal wave pattern
measurement at engine-ECU connector (Using
an oscilloscope).
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspection.
• Engine: Idling
• Transmission: P range
• Voltage between terminal INJ2 and body earth.
OK: Waveforms should be displayed on
inspection procedure using an oscilloscope
(Refer to P.13A-174).
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
Code No. P0267: No. 3 Injector Circuit Low Input
OPERATION
• Power is supplied to the injector connector terminal from the engine control relay connector terminal.
• The engine-ECU connector terminal INJ3 makes
the power transistor in the unit be in ON position,
and that makes currents go on the injector connector terminal.
FUNCTION
• The engine-ECU controls the power supply interval of the injector.
• The fuel injection amount of the injector depends
on the power supply interval.
TROUBLE JUDGMENT
Check Condition
• Engine is running.
Judgement Criterion
• The supply voltage is less than 3 V without the
injector driving.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed No. 3 injector
• Open/short circuit or harness damage in No. 3
injector circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III actuator test
• Item 1: No. 3 injector
OK: Idling state varies.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Check No. 3 injector itself.
• No.3 Injector connector check.
• Injector check (Refer to P.13A-188).
Q: Is the check result normal?
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
the No. 3 injector.
STEP 3. Perform voltage measurement at No. 3
injector connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal power supply line and
body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Check harness between engine control
relay connector terminal and No. 3 injector
connector terminal power supply line.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
13A-67
STEP 5. Check harness between No. 3 injector
connector terminal and engine-ECU connector
terminal INJ3.
• Check output line for open/short circuit and damage.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 6. Perform signal wave pattern
measurement at engine-ECU connector (Using
an oscilloscope).
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspection.
• Engine: Idling
• Transmission: P range
• Voltage between terminal INJ3 and body earth.
OK: Waveforms should be displayed on
inspection procedure using an oscilloscope
(Refer to P.13A-174).
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
Code No. P0268: No. 3 Injector Circuit High Input
OPERATION
• Power is supplied to the injector connector terminal from the engine control relay connector terminal.
• The engine-ECU connector terminal INJ3 makes
the power transistor in the unit be in ON position,
and that makes currents go on the injector connector terminal.
FUNCTION
• The engine-ECU controls the power supply interval of the injector.
• The fuel injection amount of the injector depends
on the power supply interval.
TROUBLE JUDGMENT
Check Condition
• Engine is running.
Judgement Criterion
• The coil current is more than 4.5 A with the injector driving.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed No. 3 injector
• Open/short circuit or harness damage in No. 3
injector circuit or loose connector contact
• Failed engine-ECU
13A-68
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III actuator test
• Item 1: No. 3 injector
OK: Idling state varies.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Check No. 3 injector itself.
• No. 3 Injector connector check.
• Injector check (Refer to P.13A-188).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
the No. 3 injector.
STEP 3. Check harness between No. 3 injector
connector terminal and engine-ECU connector
terminal INJ3.
• Check output line for open/short circuit and damage.
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. Perform signal wave pattern
measurement at engine-ECU connector (Using
an oscilloscope).
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspection.
• Engine: Idling
• Transmission: P range
• Voltage between terminal INJ3 and body earth.
OK: Waveforms should be displayed on
inspection procedure using an oscilloscope
(Refer to P.13A-174).
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
Q: Is the check result normal?
Code No. P0270: No. 4 Injector Circuit Low Input
OPERATION
• Power is supplied to the injector connector terminal from the engine control relay connector terminal.
• The engine-ECU connector terminal INJ4 makes
the power transistor in the unit be in ON position,
and that makes currents go on the injector connector terminal.
FUNCTION
• The engine-ECU controls the power supply interval of the injector.
• The fuel injection amount of the injector depends
on the power supply interval.
TROUBLE JUDGMENT
Check Condition
• Engine is running.
Judgement Criterion
• The supply voltage is less than 3 V without the
injector driving.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed No. 4 injector
• Open/short circuit or harness damage in No. 4
injector circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III actuator test
• Item 1: No. 4 injector
OK: Idling state varies.
Q: Is the check result normal?
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Check No. 4 injector itself.
• No. 4 Injector connector check.
• Injector check (Refer to P.13A-188).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
13A-69
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 5. Check harness between No. 4 injector
connector terminal and engine-ECU connector
terminal INJ4.
• Check output line for open/short circuit and damage.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
the damaged harness wire.
the No. 4 injector.
STEP 3. Perform voltage measurement at No. 4
injector connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal power supply line and
body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Check harness between engine control
relay connector terminal and No. 4 injector
connector terminal power supply line.
• Check power supply line for damage.
Q: Is the check result normal?
STEP 6. Perform signal wave pattern
measurement at engine-ECU connector (Using
an oscilloscope).
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspection.
• Engine: Idling
• Transmission: P range
• Voltage between terminal INJ4 and body earth.
OK: Waveforms should be displayed on
inspection procedure using an oscilloscope
(Refer to P.13A-174).
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
Code No. P0271: No. 4 Injector Circuit High Input
OPERATION
• Power is supplied to the injector connector terminal from the engine control relay connector terminal.
• The engine-ECU connector terminal INJ4 makes
the power transistor in the unit be in ON position,
and that makes currents go on the injector connector terminal.
FUNCTION
• The engine-ECU controls the power supply interval of the injector.
• The fuel injection amount of the injector depends
on the power supply interval.
TROUBLE JUDGMENT
Check Condition
• Engine is running.
Judgement Criterion
• The coil current is more than 4.5 A with the injector driving.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed No. 4 injector
13A-70
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
• Open/short circuit or harness damage in No. 4
injector circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III actuator test
• Item 1: No. 4 injector
OK: Idling state varies.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Check No. 4 injector itself.
• No. 4 Injector connector check.
• Injector check (Refer to P.13A-188).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
the No. 4 injector.
STEP 3. Check harness between No. 4 injector
connector terminal and engine-ECU connector
terminal INJ4.
• Check output line for open/short circuit and damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. Perform signal wave pattern
measurement at engine-ECU connector (Using
an oscilloscope).
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspection.
• Engine: Idling
• Transmission: P range
• Voltage between terminal INJ4 and body earth.
OK: Waveforms should be displayed on
inspection procedure using an oscilloscope
(Refer to P.13A-174).
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
Code No. P0300: Random/Multiple Cylinder Misfire Detected
OPERATION
• Check code No. P0261: No. 1 injector circuit low
input (Refer to P.13A-62).
• Check code No. P0262: No. 1 injector circuit high
input (Refer to P.13A-63).
• Check code No. P0264: No. 2 injector circuit low
input (Refer to P.13A-64).
• Check code No. P0265: No. 2 injector circuit high
input (Refer to P.13A-65).
• Check code No. P0267: No. 3 injector circuit low
input (Refer to P.13A-66).
• Check code No. P0268: No. 3 injector circuit high
input (Refer to P.13A-67).
• Check code No. P0270: No. 4 injector circuit low
input (Refer to P.13A-68).
• Check code No. P0271: No. 4 injector circuit high
input (Refer to P.13A-69).
• Adaptive learning is complete for the vane which
FUNCTION
• If a misfire occurs while the engine is running, the
engine speed changes for an instant.
• The engine-ECU checks for such changes in
engine speed.
TROUBLE JUDGMENT
Check Conditions
• Engine speed is more than 440 r/min and is less
than 4,500 r/min.
• Engine coolant temperature is more than −10°C.
• Barometric pressure is more than 76 kPa.
• Volumetric efficiency is more than 20 % and is
less than 40 %. <4B11>
• Volumetric efficiency is more than 30 % and is
less than 60 %. <4B12>
generates a crankshaft position signal.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
• While the engine is running, excluding gear shifting, deceleration, sudden acceleration/deceleration and A/C compressor switching.
• The throttle deviation is -0.06 V/10 ms to +0.06
V/10 ms.
Judgement Criterion (change in the angular
acceleration of the crankshaft is used for misfire detection).
• Misfire has occurred more frequently than
allowed during the last 200 revolutions (when the
catalyst temperature is more than 1,000°C).
or
• Misfire has occurred in 15 or more of the last
1,000 revolutions (corresponding to 1.5 times the
limit of emission standard).
FAIL-SAFE AND BACKUP FUNCTION
• The supply of fuel to the misfiring cylinder can
possibly be cut.
PROBABLE CAUSES
•
•
•
•
•
•
•
•
•
•
Ignition system related part(s) failed
Failed crank angle sensor
Failed injector
Incorrect air-fuel ratio
Low compression pressure
Failed intake air temperature sensor
Failed engine coolant temperature sensor
Failed air flow sensor
Skipping of timing chain teeth.
Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 2: Crank angle sensor
b. Item 5: Intake air temperature sensor
c. Item 6: Engine coolant temperature sensor
d. Item 10: Air flow sensor
e. Item 26: Long-term fuel trim
f. Item 28: Short-term fuel trim
Q: Are the check results normal?
YES : Go to Step 2.
NO : Perform the diagnosis code classified check
procedure for the sensor that has shown an
abnormal data value. Inspection chart for
diagnosis code (Refer to P.13A-23).
13A-71
STEP 2. Visual check of ignition spark.
• Remove the spark plug and install it to the ignition
coil.
• Connect the ignition coil connector.
• Disconnect all injector connectors.
• At the engine start, check each spark plug produces a spark.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Check Inspection Procedure − ignition
circuit system (Refer to P.13A-152).
STEP 3. Check injector itself.
a. No. 1 injector connector
b. No. 2 injector connector
c. No. 3 injector connector
d. No. 4 injector connector
e. Injector check (Refer to P.13A-188).
Q: Are the check results normal?
YES : Go to Step 4.
NO : Repair or replace the connector or replace
the injector.
STEP 4. Check air intake from inlet hose and inlet
manifold.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair.
STEP 5. Fuel pressure measurement.
• Fuel pressure test (Refer to P.13A-179)
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair.
STEP 6. Check for skipped timing chain teeth.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the timing chain.
STEP 7. Check compression pressure.
• Check the compression pressure (Refer to
GROUP 11A − On-vehicle Service − Compression Pressure Check ).
Q: Is the check result normal?
YES : Go to Step 8.
NO : Repair.
13A-72
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Check for foreign matters (water, diesel fuel,
STEP 8. Replace the engine-ECU.
• After replacing the engine-ECU, reconfirm
whether the diagnosis code is set.
etc.) in fuel and replace if necessary.
NO : Check end.
Q: Is the diagnosis code set?
Code No. P0301: No. 1 Cylinder Misfire Detected
OPERATION
• Check code No. P0261: No. 1 injector circuit low
input (Refer to P.13A-62).
• Check code No. P0262: No. 1 injector circuit high
input (Refer to P.13A-63).
FUNCTION
• If a misfire occurs while the engine is running, the
engine speed changes for an instant.
• The engine-ECU checks for such changes in
engine speed.
TROUBLE JUDGMENT
Check Conditions
• Engine speed is more than 440 r/min and is less
than 4,500 r/min.
• Engine coolant temperature is more than −10°C.
(However, 20°C when the engine coolant temperature at engine start is -10°C or less).
• Barometric pressure is more than 76 kPa.
• Volumetric efficiency is more than 20 % and is
less than 60 %. <4B11>
• Volumetric efficiency is more than 30 % and is
less than 60 %. <4B12>
• Adaptive learning is complete for the vane which
generates a crankshaft position signal.
• While the engine is running, excluding gear shifting, deceleration, sudden acceleration/deceleration and A/C compressor switching.
• The throttle deviation is -0.06 V/10 ms to +0.06
V/10 ms.
Judgement Criterion (change in the angular
acceleration of the crankshaft is used for misfire detection).
• Misfire has occurred more frequently than
allowed during the last 200 revolutions (when the
catalyst temperature is more than 1,000°C).
or
• Misfire has occurred a predetermined value (2%)
or more in the first 1,000 revolutions from engine
start-up (corresponding to 1.5 times the limit of
emission standard).
or
• After the first 1,000 revolutions, the following criterion is safisfied 4 times cumulatively.
• Misfire counts per 1,000 revolutions exceeds a
predetermined value (2%) (corresponding to 1.5
times the limit of emission standard).
FAIL-SAFE AND BACKUP FUNCTION
• The supply of fuel to the misfiring cylinder can
possibly be cut.
PROBABLE CAUSES
•
•
•
•
•
Ignition system related part(s) failed
Failed No. 1 injector
Harness damage in No. 1 injector circuit
Low compression pressure
Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Visual check of ignition spark on No. 1
cylinder.
• Remove the spark plug and install it to the ignition
coil.
• Connect the ignition coil connector.
• Disconnect all injector connectors.
• At the engine start, check spark plug produces a
spark.
Q: Is the check result normal?
YES : Go to Step 2
NO : Check Inspection Procedure − ignition
circuit system (Refer to P.13A-152).
STEP 2. Check No. 1 injector itself.
• Injector connector check.
• Injector check (Refer to P.13A-188).
Q: Is the check result normal?
YES : Go to Step 3
NO : Repair or replace the connector, or replace
the No. 1 injector.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 3. Check harness between engine control
relay connector terminal and No. 1 injector
connector terminal power supply line.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 4
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. Check harness between No. 1 injector
connector terminal and engine-ECU connector
terminal INJ1.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 5
NO : Repair or replace the connector, or repair
13A-73
STEP 5. Check compression pressure of No. 1
cylinder.
• Check the compression pressure (Refer to
GROUP 11A − On-vehicle Service − Compression Pressure Check .
Q: Is the check result normal?
YES : Go to Step 6
NO : Repair.
STEP 6. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
the damaged harness wire.
Code No. P0302: No. 2 Cylinder Misfire Detected
OPERATION
• Check code No. P0264: No. 2 injector circuit low
input (Refer to P.13A-64).
• Check code No. P0265: No. 2 injector circuit high
input (Refer to P.13A-65).
FUNCTION
• If a misfire occurs while the engine is running, the
engine speed changes for an instant.
• The engine-ECU checks for such changes in
engine speed.
TROUBLE JUDGMENT
Check Conditions
• Engine speed is more than 440 r/min and is less
than 4,500 r/min.
• Engine coolant temperature is more than −10°C.
(However, 20°C when the engine coolant temperature at engine start is -10°C or less).
• Barometric pressure is more than 76 kPa.
• Volumetric efficiency is more than 20 % and is
less than 60 %. <4B11>
• Volumetric efficiency is more than 30 % and is
less than 60 %. <4B12>
• Adaptive learning is complete for the vane which
generates a crankshaft position signal.
• While the engine is running, excluding gear shifting, deceleration, sudden acceleration/deceleration and A/C compressor switching.
• The throttle deviation is -0.06 V/10 ms to +0.06
V/10 ms.
Judgement Criterion (change in the angular
acceleration of the crankshaft is used for misfire detection).
• Misfire has occurred more frequently than
allowed during the last 200 revolutions (when the
catalyst temperature is more than 1,000°C).
or
• Misfire has occurred a predetermined value (2%)
or more in the first 1,000 revolutions from engine
start-up (corresponding to 1.5 times the limit of
emission standard).
or
• After the first 1,000 revolutions, the following criterion is safisfied 4 times cumulatively.
• Misfire counts per 1,000 revolutions exceeds a
predetermined value (2%) (corresponding to 1.5
times the limit of emission standard).
FAIL-SAFE AND BACKUP FUNCTION
• The supply of fuel to the misfiring cylinder can
possibly be cut.
PROBABLE CAUSES
•
•
•
•
•
Ignition system related part(s) failed
Failed No. 2 injector
Harness damage in No. 2 injector circuit
Low compression pressure
Failed engine-ECU
13A-74
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
DIAGNOSIS PROCEDURE
STEP 1. Visual check of ignition spark on No. 2
cylinder.
• Remove the spark plug and install it to the ignition
coil.
• Connect the ignition coil connector.
• Disconnect all injector connectors.
• At the engine start, check spark plug produces a
spark.
Q: Is the check result normal?
YES : Go to Step 2
NO : Check Inspection Procedure − ignition
circuit system (Refer to P.13A-152).
YES : Go to Step 4
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. Check harness between No. 2 injector
connector terminal and engine-ECU connector
terminal INJ2.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 5
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 2. Check No. 2 injector itself.
• Injector connector check.
• Injector check (Refer to P.13A-188).
STEP 5. Check compression pressure of No. 2
cylinder.
• Check the compression pressure (Refer to
GROUP 11A − On-vehicle Service − Compression Pressure Check ).
Q: Is the check result normal?
YES : Go to Step 3
NO : Repair or replace the connector, or replace
Q: Is the check result normal?
YES : Go to Step 6
NO : Repair.
the No. 2 injector.
STEP 3. Check harness between engine control
relay connector terminal and No. 2 injector
connector terminal power supply line.
• Check power supply line for damage.
Q: Is the check result normal?
STEP 6. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P0303: No. 3 Cylinder Misfire Detected
OPERATION
• Check code No. P0267: No. 3 injector circuit low
input (Refer to P.13A-66).
• Check code No. P0268: No. 3 injector circuit high
input (Refer to P.13A-67).
FUNCTION
• If a misfire occurs while the engine is running, the
engine speed changes for an instant.
• The engine-ECU checks for such changes in
engine speed.
TROUBLE JUDGMENT
Check Conditions
• Engine speed is more than 440 r/min and is less
than 4,500 r/min.
• Engine coolant temperature is more than −10°C.
(However, 20°C when the engine coolant temperature at engine start is -10°C or less).
• Barometric pressure is more than 76 kPa.
• Volumetric efficiency is more than 20 % and is
less than 60 %. <4B11>
• Volumetric efficiency is more than 30 % and is
less than 60 %. <4B12>
• Adaptive learning is complete for the vane which
generates a crankshaft position signal.
• While the engine is running, excluding gear shifting, deceleration, sudden acceleration/deceleration and A/C compressor switching.
• The throttle deviation is -0.06 V/10 ms to +0.06
V/10 ms.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
Judgement Criterion (change in the angular
acceleration of the crankshaft is used for misfire detection).
• Misfire has occurred more frequently than
allowed during the last 200 revolutions (when the
catalyst temperature is more than 1,000°C).
or
• Misfire has occurred a predetermined value (2%)
or more in the first 1,000 revolutions from engine
start-up (corresponding to 1.5 times the limit of
emission standard).
or
• After the first 1,000 revolutions, the following criterion is safisfied 4 times cumulatively.
• Misfire counts per 1,000 revolutions exceeds a
predetermined value (2%) (corresponding to 1.5
times the limit of emission standard).
13A-75
STEP 2. Check No. 3 injector itself.
• Injector connector check.
• Injector check (Refer to P.13A-188).
Q: Is the check result normal?
YES : Go to Step 3
NO : Repair or replace the connector, replace the
No. 3 injector.
STEP 3. Check harness between engine control
relay connector terminal and No. 3 injector
connector terminal power supply line.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 4
NO : Repair or replace the connector, or repair
the damaged harness wire.
FAIL-SAFE AND BACKUP FUNCTION
• The supply of fuel to the misfiring cylinder can
possibly be cut.
PROBABLE CAUSES
•
•
•
•
•
Ignition system related part(s) failed
Failed No. 3 injector
Harness damage in No. 3 injector circuit
Low compression pressure
Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Visual check of ignition spark on No. 3
cylinder.
• Remove the spark plug and install it to the ignition
coil.
• Connect the ignition coil connector.
• Disconnect all injector connectors.
• At the engine start, check spark plug produces a
spark.
Q: Is the check result normal?
YES : Go to Step 2
NO : Check Inspection Procedure − ignition
circuit system (Refer to P.13A-152).
STEP 4. Check harness between No. 3 injector
connector terminal and engine-ECU connector
terminal INJ3.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 5
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 5. Check compression pressure of No. 3
cylinder.
• Check the compression pressure (Refer to
GROUP 11A − On-vehicle Service − Compression Pressure Check ).
Q: Is the check result normal?
YES : Go to Step 6
NO : Repair.
STEP 6. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P0304: No. 4 Cylinder Misfire Detected
OPERATION
• Check code No. P0270: No. 4 injector circuit low
input (Refer to P.13A-68).
13A-76
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
• Check code No. P0271: No. 4 injector circuit high
input (Refer to P.13A-69).
FUNCTION
• If a misfire occurs while the engine is running, the
engine speed changes for an instant.
• The engine-ECU checks for such changes in
engine speed.
PROBABLE CAUSES
•
•
•
•
•
Ignition system related part(s) failed
Failed No. 4 injector
Harness damage in No. 4 injector circuit
Low compression pressure
Failed engine-ECU
DIAGNOSIS PROCEDURE
TROUBLE JUDGMENT
Check Conditions
• Engine speed is more than 440 r/min and is less
than 4,500 r/min.
• Engine coolant temperature is more than −10°C.
(However, 20°C when the engine coolant temperature at engine start is -10°C or less).
• Barometric pressure is more than 76 kPa.
• Volumetric efficiency is more than 20 % and is
less than 60 %. <4B11>
• Volumetric efficiency is more than 30 % and is
less than 60 %. <4B12>
• Adaptive learning is complete for the vane which
generates a crankshaft position signal.
• While the engine is running, excluding gear shifting, deceleration, sudden acceleration/deceleration and A/C compressor switching.
• The throttle deviation is -0.06 V/10 ms to +0.06
V/10 ms.
Judgement Criterion (change in the angular
acceleration of the crankshaft is used for misfire detection).
• Misfire has occurred more frequently than
allowed during the last 200 revolutions (when the
catalyst temperature is more than 1,000°C).
or
• Misfire has occurred a predetermined value (2%)
or more in the first 1,000 revolutions from engine
start-up (corresponding to 1.5 times the limit of
emission standard).
or
• After the first 1,000 revolutions, the following criterion is safisfied 4 times cumulatively.
• Misfire counts per 1,000 revolutions exceeds a
predetermined value (2%) (corresponding to 1.5
times the limit of emission standard).
FAIL-SAFE AND BACKUP FUNCTION
• The supply of fuel to the misfiring cylinder can
possibly be cut.
STEP 1. Visual check of ignition spark on No. 4
cylinder.
• Remove the spark plug and install it to the ignition
coil.
• Connect the ignition coil connector.
• Disconnect all injector connectors.
• At the engine start, check spark plug produces a
spark.
Q: Is the check result normal?
YES : Go to Step 2
NO : Check Inspection Procedure − ignition
circuit system (Refer to P.13A-152).
STEP 2. Check No. 4 injector itself.
• Injector connector check.
• Injector check (Refer to P.13A-188).
Q: Is the check result normal?
YES : Go to Step 3
NO : Repair or replace the connector, or replace
the No. 4 injector.
STEP 3. Check harness between engine control
relay connector terminal and No. 4 injector
connector terminal power supply line.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 4
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. Check harness between No. 4 injector
connector terminal and engine-ECU connector
terminal INJ4.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 5
NO : Repair or replace the connector, or repair
the damaged harness wire.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 5. Check compression pressure of No. 4
cylinder.
• Check the compression pressure (Refer to
GROUP 11A − On-vehicle Service − Compression Pressure Check ).
13A-77
STEP 6. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Q: Is the check result normal?
YES : Go to Step 6
NO : Repair.
Code No. P0327: Detonation Sensor Circuit Low Input
OPERATION
• A power voltage of 5 V is applied to the detonation sensor terminal from the engine-ECU connector terminal K/S.
• The power voltage is earthed to the engine-ECU
connector terminal K/SE from the detonation sensor connector terminal.
FUNCTION
• The detonation sensor detects the vibration of the
cylinder block caused by detonation waves, and
inputs a signal to the engine-ECU.
• In response to the signal, the engine-ECU provides controls to retard the ignition timing when
the detonation occurs.
DIAGNOSIS PROCEDURE
STEP 1. Check harness between detonation
sensor connector terminal and engine-ECU
connector terminal K/SE.
• Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair or replace the connector, or repair
the damaged harness wire.
TROUBLE JUDGMENT
STEP 2. Check harness between detonation
sensor terminal and engine-ECU connector
terminal K/S.
• Check power line for open/short circuit and damage.
Check Condition
• More than 2 seconds have passed since the
engine starting sequence was completed.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or repair
Judgement Criterion
• Detonation sensor output voltage is less than 0.5
V for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• Fix the ignition timing with an allowance against
detonation.
PROBABLE CAUSES
• Failed detonation sensor
• Open/short circuit or harness damage in detonation sensor circuit or loose connector contact
• Failed engine-ECU
the damaged harness wire.
STEP 3. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Go to Step 4.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 4. Replace the detonation sensor
• After replacing the detonation sensor, reconfirm
whether the diagnosis code is set.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
13A-78
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
Code No. P0328: Detonation Sensor Circuit High Input
OPERATION
• A power voltage of 5 V is applied to the detonation sensor terminal from the engine-ECU connector terminal K/S.
• The power voltage is earthed to the engine-ECU
connector terminal K/SE from the detonation sensor connector terminal.
FUNCTION
• The detonation sensor detects the vibration of the
cylinder block caused by detonation waves, and
inputs a signal to the engine-ECU.
• In response to the signal, the engine-ECU provides controls to retard the ignition timing when
the detonation occurs.
TROUBLE JUDGMENT
Check Condition
• More than 2 seconds have passed since the
engine starting sequence was completed.
Judgement Criterion
• Detonation sensor output voltage is more than
2.25 V for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• Fix the ignition timing with an allowance against
detonation.
PROBABLE CAUSES
• Short circuit in detonation sensor circuit or loose
connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check harness between detonation
sensor connector terminal and engine-ECU
connector terminal K/SE.
• Check earthing line for short circuit.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair or replace the connector, repair the
damaged harness wire.
STEP 2. Check harness between detonation
sensor connector terminal and engine-ECU
connector terminal K/S.
• Check power line for short circuit.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the damaged harness wire.
STEP 3. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P0335: Crank Angle Sensor System
OPERATION
• Output signal is supplied to the engine-ECU connector terminal SGT from the crank angle sensor
connector terminal and is earthed to the
engine-ECU connector terminal SGTE from the
crank angle sensor connector terminal.
• A power voltage of 5 V is applied to the crank
angle sensor connector terminal from the
engine-ECU connector terminal 5V.
FUNCTION
• The crank angle sensor detects the crank angle
and inputs a pulse signal to the engine-ECU.
• In response to the signal, the engine-ECU controls the injector, etc.
TROUBLE JUDGMENT
Check Condition, Judgement Criterion
• Normal signal pattern has not been input for cylinder identification from the crank angle sensor
signal and inlet camshaft position sensor signal
for 2 seconds.
Check Condition
• Engine is being cranked.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
Judgement Criterion
• Crank angle sensor output voltage has not
changed (no pulse signal is input) for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed crank angle sensor
• Open/short circuit or harness damage in crank
angle sensor circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 2: Crank angle sensor
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Perform voltage measurement at crank
angle sensor connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU 5V line
and body earth.
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 3.
STEP 3. Check harness between crank angle
sensor connector terminal and engine-ECU
connector terminal 5V.
• Check power supply line for open/short circuit.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
STEP 5. Perform voltage measurement at crank
angle sensor connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU SGT line
and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Check harness between crank angle
sensor connector terminal and engine-ECU
connector terminal SGT.
• Check output line for open/short circuit.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 7. Perform resistance measurement at
crank angle sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal engine-ECU SGTE
line and body earth.
OK: Continuity (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 9.
NO : Go to Step 8.
STEP 8. Check harness between crank angle
sensor connector terminal and engine-ECU
connector terminal SGTE.
• Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 2: Crank angle sensor
Q: Is the check result normal?
13A-79
13A-80
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 9. Perform output wave pattern
measurement at crank angle sensor connector
(Using an oscilloscope).
• Use special tool test harness (MB991709) to connect connector, and measure at pick-up harness.
• Engine: Idling
• Transmission: P range
• Voltage between terminal engine-ECU 5V line
and earth.
OK: Waveforms should be displayed on
inspection procedure using an oscilloscope
(Refer to P.13A-174), its maximum value
should be 4.8 V or more, and its minimum
value should be 0.6 V or less. There must be
no noise in the output wave pattern.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Go to Step 10.
YES : Go to Step 11.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 11. Check harness between crank angle
sensor connector terminal and engine-ECU
connector terminal SGT.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 12.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 12. Replace the crank angle sensor
• After replacing the crank angle sensor, reconfirm
whether the diagnosis code is set.
Q: Is the diagnosis code set?
YES : Replace the crank angle sensor sensing
ring.
STEP 10. Check harness between crank angle
sensor connector terminal and engine-ECU
connector terminal 5V.
• Check power supply line for damage.
NO : Check end.
Q: Is the check result normal?
Code No. P0340: Inlet Camshaft Position Sensor System
OPERATION
• Output signal is supplied to the engine-ECU connector terminal CPI from the crank angle sensor
connector terminal and is earthed to the
engine-ECU connector terminal CPIE from the
crank angle sensor connector terminal.
• A power voltage of 5 V is applied to the inlet camshaft position sensor output terminal connector
terminal from the engine-ECU connector terminal
5V.
FUNCTION
• The inlet camshaft position sensor detects the
position of the inlet camshaft and inputs the pulse
signal to the engine-ECU.
• In response to the inlet camshaft position sensor
signal and the crank angle sensor signal, the
engine-ECU detects the compression top dead
centre of the No. 1 cylinder.
• Also, in response to the inlet camshaft position
sensor signal, the engine-ECU controls variable
valve timing (V.V.T.).
TROUBLE JUDGMENT
Check Condition, Judgment Criterion
• Normal signal pattern has not been input for cylinder identification from the crank angle sensor
signal and inlet camshaft position sensor signal
for 2 seconds.
Check Condition
• Engine is being cranked.
Judgement Criterion
• Inlet camshaft position sensor output voltage has
not changed (no pulse signal is input) for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• Engine runs is learned pattern until engine stops.
• Does not control variable valve timing (V.V.T.).
PROBABLE CAUSES
• Failed inlet camshaft position sensor
• Open/short circuit or harness damage in inlet
camshaft position sensor circuit or loose connector contact
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Perform voltage measurement at inlet
camshaft position sensor connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU 5V line
and body earth.
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 4.
NO : Go to Step 2.
13A-81
STEP 5. Check harness between inlet camshaft
position sensor connector terminal and
engine-ECU connector terminal CPI.
• Check output line for open/short circuit.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 6. Perform resistance measurement at inlet
camshaft position sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal engine-ECU CPIE
line and earth.
OK: Continuity (2 Ω or less)
STEP 2. Check harness between inlet camshaft
position sensor connector terminal and
engine-ECU connector terminal 5V.
• Check power supply line for open/short circuit.
Q: Is the check result normal?
YES : Go to Step 8.
NO : Go to Step 7.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or repair
STEP 7. Check harness between inlet camshaft
position sensor connector terminal and
engine-ECU connector terminal CPIE.
• Check earthing line for open circuit and damage.
the damaged harness wire.
STEP 3. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 4. Perform voltage measurement at inlet
camshaft position sensor connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU CPI line
and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 6.
NO : Go to Step 5.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 8. Perform output wave pattern
measurement at inlet camshaft position sensor
connector (Using an oscilloscope).
• Use special tool test harness (MB991709) to connect connector, and measure at pick-up harness.
• Engine: Idling
• Transmission: P range
• Voltage between terminal engine-ECU 5V line
and body earth.
OK: Waveforms should be displayed on
inspection procedure using an oscilloscope
(Refer to P.13A-174), its maximum value
should be 4.8 V or more, and its minimum
value should be 0.6 V or less. There must be
no noise in the output wave pattern.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Go to Step 9.
13A-82
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 9. Check harness between inlet camshaft
position sensor connector terminal and
engine-ECU connector terminal 5V.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 10. Check harness between inlet camshaft
position sensor connector terminal and
engine-ECU connector terminal CPI.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 11.
NO : Repair the damaged harness wire.
STEP 11. Check intake camshaft sensing
position.
Q: Is the check result normal?
YES : Go to Step 12.
NO : Replace the intake camshaft.
STEP 12. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES : Replace the inlet camshaft position sensor.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P0421: Catalyst Malfunction
FUNCTION
• The signal from the oxygen sensor (rear) differs
from the oxygen sensor (front). That is because
the catalytic converter purifies exhaust gas.
When the catalytic converter has deteriorated,
the signal from the oxygen sensor (front)
becomes similar to the oxygen sensor (rear).
• The engine-ECU compares the output of the front
and rear oxygen sensor signals.
TROUBLE JUDGMENT
Check Conditions
• Engine speed is less than 3,000 r/min.
• Accelerator pedal is open.
• Air flow sensor output is more than 5 g/sec and is
less than 50 g/sec. <4B11>
• Air flow sensor output is more than 6.4 g/sec and
is less than 65 g/sec. <4B12>
• More than 3 seconds have elapsed after the
above mentioned three conditions have been
met.
• Intake air temperature is more than −10°C.
• Barometric pressure is more than 76 kPa.
• Under the closed loop air/fuel ratio control.
• Vehicle speed is more than 1.5 km/h.
• The engine-ECU monitors for this condition for 5
cycles of 10 seconds each during the drive cycle.
• Short-term fuel trim is more than −25 % and is
less than +25 %.
• The cumulative air flow is more than 3,700 g.
<4B11>
• The cumulative air flow is more than 2,834 g.
<4B12>
Judgement Criterion
• When the monitoring for 10 seconds is carried
out 5 times, the frequency ratio of oxygen sensor
(rear) and oxygen sensor (front) is more than
0.85.
NOTE: The specified value varies depending on the
average air flow rate.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Catalytic converter deteriorated
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Replace the catalytic converter.
• After replacing the catalytic converter, reconfirm
whether the diagnosis code is set.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
13A-83
Code No. P0458: Purge Control Solenoid Valve Circuit Low Input
OPERATION
• Power is supplied to the purge control solenoid
valve connector terminal from the engine control
relay connector terminal.
• The engine-ECU connector terminal PURG
makes the power transistor in the unit be in ON
position, and that makes currents go on the purge
control solenoid valve connector terminal.
FUNCTION
• In response to a signal from the engine-ECU, the
purge control solenoid valve controls the flow rate
of the purge air to be introduced into the inlet
manifold.
TROUBLE JUDGMENT
Check Conditions
• Engine is being cranked.
• Battery positive voltage is more than 10 V and is
less than 16.5 V.
Judgement Criteria
• The solenoid voltage is more than 3 V with the
purge control solenoid driving.
• The engine-ECU monitors this condition once
during the drive cycle.
Check Conditions
• Battery positive voltage is more than 10 V and is
less than 16.5 V.
Judgement Criterion
• The solenoid voltage is more than 3 V for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed purge control solenoid valve
• Open/short circuit or harness damage in purge
control solenoid value circuit or loose connector
contact
• Failed engine-ECU
YES : Check intermediate connector, and repair if
necessary. If intermediate connector is
normal, check and repair harness between
purge control solenoid valve connector
terminal and engine control relay connector
terminal power supply line.
• Check power supply line for
open/short circuit.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III actuator test
• Item 10: Purge control solenoid valve
OK: Operating sound can be heard and the
valve vibrates
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Perform resistance measurement at
purge control solenoid valve connector.
• Disconnect connector, and measure at solenoid
valve side.
• Resistance between terminals.
OK: 22 − 26 Ω (at 20°C)
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
the purge control solenoid valve.
STEP 3. Perform voltage measurement at purge
control solenoid valve connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal power supply line and
body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Connector check: engine control relay
connector
Q: Is the check result normal?
NO : Repair or replace the connector.
13A-84
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 5. Perform voltage measurement at
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal PURG and earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or check
and repair harness between purge control
solenoid valve connector terminal and
engine-ECU connector terminal PURG.
• Check output line for open/short
circuit.
STEP 6. Check harness between purge control
solenoid valve connector terminal and
engine-ECU connector terminal PURG.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair or replace the connector, or repair
STEP 7. Check harness between purge control
solenoid valve connector terminal and engine
control relay connector terminal power supply
line.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 8.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 8. M.U.T.-III actuator test
• Item 10: purge control solenoid valve
OK: Operating sound can be heard and the
valve vibrates
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
the damaged harness wire.
Code No. P0459: Purge Control Solenoid Valve Circuit High Input
OPERATION
• Power is supplied to the purge control solenoid
valve connector terminal from the engine control
relay connector terminal.
• The engine-ECU connector terminal PURG
makes the power transistor in the unit be in ON
position, and that makes currents go on the purge
control solenoid valve connector terminal.
FUNCTION
• In response to a signal from the engine-ECU, the
purge control solenoid valve controls the flow rate
of the purge air to be introduced into the inlet
manifold.
TROUBLE JUDGMENT
Check Conditions
• Engine is being cranked.
• Battery positive voltage is more than 10 V and is
less than 16.5 V.
Judgement Criteria
• The solenoid current is more than 2.3 A with the
purge control solenoid driving.
• The engine-ECU monitors this condition once
during the drive cycle.
Check Conditions
• Battery positive voltage is more than 10 V and is
less than 16.5 V.
Judgement Criterion
• The solenoid current is more than 2.3 A for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed purge control solenoid valve
• Short circuit or harness damage in purge control
solenoid value circuit or loose connector contact
• Failed engine-ECU
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III actuator test
• Item 10: Purge control solenoid valve
OK: Operating sound can be heard and the
valve vibrates
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
13A-85
YES : Go to Step 4.
NO : Repair or replace the connector, or check
and repair harness between purge control
solenoid valve connector terminal and
engine-ECU connector terminal PURG.
• Check output line for short circuit.
STEP 4. Check harness between purge control
solenoid valve connector terminal and
engine-ECU connector terminal PURG.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 2. Perform resistance measurement at
purge control solenoid valve connector.
• Disconnect connector, and measure at solenoid
valve side.
• Resistance between terminals.
OK: 22 − 26 Ω (at 20°C)
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
the purge control solenoid valve.
STEP 3. Perform voltage measurement at
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal PURG and body earth.
OK: System voltage
STEP 5. M.U.T.-III actuator test
• Item 10: purge control solenoid valve
OK: Operating sound can be heard and the
valve vibrates
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
Q: Is the check result normal?
Code No. P0513: Immobilizer Malfunction
CAUTION
• When the ETACS-ECU of vehicles without
KOS is replaced, the encrypted code of the
ignition key needs to be registered to the
ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in
GROUP 54A, Immobilizer System − How to
Register Key ID .)
FUNCTION
• The engine-ECU transmits to and receives from
KOS-ECU <Vehicles with KOS> or ETACS-ECU
<Vehicles without KOS> a control signal to
authenticate the ignition key.
NOTE: .
• This code may be displayed due to radio interference if there are multiple registered ignition keys
nearby during engine start.
• This code may be displayed when the transponder ID code is registered.
• This code is also displayed when the ignition key
code is not recognized.
• When this code is displayed, it is also sent to
KOS-ECU <Vehicles with KOS> or ETACS-ECU
<Vehicles without KOS>
13A-86
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
TROUBLE JUDGMENT
Check Conditions
• Ignition switch is "ON" position.
• After the engine is cranked.
Judgement Criterion
• When it was different in the encrypted code sent
from KOS-ECU <Vehicles with KOS> or
ETACS-ECU <Vehicles without KOS> and operation result by engine-ECU.
FAIL-SAFE AND BACKUP FUNCTION
• Engine start is prohibited.
PROBABLE CAUSES
• Failed KOS-ECU <Vehicles with KOS> or
ETACS-ECU <Vehicles without KOS>
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III other system diagnosis code
• Reconfirmation whether diagnosis code is output
from KOS-ECU <Vehicles with KOS> or
ETACS-ECU <Vehicles without KOS>.
Q: Is the diagnosis code set?
YES : Perform the troubleshooting of KOS-ECU
<Vehicles with KOS> or ETACS-ECU
<Vehicles without KOS> (Refer to GROUP
42B − Troubleshooting − Diagnosis Code
Chart <Vehicles with KOS>, Refer to
GROUP 54A − Troubleshooting − Diagnosis
Code Chart <Vehicles without KOS>).
NO : Go to Step 2.
STEP 2. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES : Replace the KOS-ECU <Vehicles with
KOS> or ETACS-ECU <Vehicles without
KOS>. After the replacement, put the each
identification code into KOS-ECU <Vehicles
with KOS> or ETACS-ECU <Vehicles
without KOS>. Then go to Step 3.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent malfunctions
).
STEP 3. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
Code No. P0602: Variant Coding System
FUNCTION
• The engine-ECU performs proper engine control
based on vehicle information entered.
• A vehicle identification number (VIN) is entered at
a plant before shipment. This diagnosis code
occurs when no vehicle information is entered
during engine-ECU replacement.
or
• The tester write area of EEPROM is abnormal.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSE
• Failed engine-ECU
TROUBLE JUDGMENT
Check Condition
• Ignition switch is "ON" position.
Judgment Criterion
• Vehicle information is not entered into the
engine-ECU.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
13A-87
YES : Replace the engine-ECU with one into
which vehicle information is correctly
entered.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P0604: RAM Error
FUNCTION
• Monitors the computation function of the
engine-ECU periodically.
TROUBLE JUDGMENT
• Throttle opening degree position is in default
position.
PROBABLE CAUSE
• Failed engine-ECU
Check Condition
• Ignition switch is "ON" position.
DIAGNOSIS PROCEDURE
Judgement Criterion
• All RAM data of engine-ECU are defect.
or
• RAM data (engine) is defect.
STEP 1. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
FAIL-SAFE AND BACKUP FUNCTION
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
• Microcomputer is reset.
or
Code No. P0606: Engine-ECU main processor malfunction
OPERATION
• Check Inspection Procedure − engine-ECU
power supply, engine control relay, ignition
switch-IG1 system (Refer to P.13A-147).
FUNCTION
• The engine-ECU check whether the microcomputer, which performs the drive control of the
throttle valve, is normal.
TROUBLE JUDGMENT
Check Condition
• Ignition switch is "ON" position.
Judgement Criterion
• No surveillance pulse signals should be input.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree position is in default
position.
PROBABLE CAUSES
• Failed engine control relay
• Short circuit in the engine control relay circuit or
loose connector contact.
• Open/short circuit or harness damage in the ignition switch (IG) circuit or loose connector contact.
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check battery.
• Battery check (Refer to GROUP 54A − Battery −
On-vehicle Service − Battery Test ).
Q: Is the check result normal?
13A-88
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Go to Step 2.
NO : Replace the battery.
STEP 2. Perform voltage measurement at
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal IGN and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or check
and repair harness between ETACS-ECU
connector terminal IGN and engine-ECU
connector terminal IGN.
• Check signal line for open/short
circuit.
STEP 3. Check harness between ETACS-ECU
connector terminal IGN and engine-ECU
connector terminal IGN.
• Check signal line for damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. Check engine control relay itself.
• Engine control relay connector check.
• Engine control relay continuity check (Refer to
P.13A-184).
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or replace
the engine control relay.
STEP 5. Check harness between engine control
relay connector terminal and engine-ECU
connector terminal C/R.
• Check signal line for short circuit.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair the damaged harness wire.
STEP 6. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P060B: A/D Converter
FUNCTION
• Monitors whether input voltage from the accelerator pedal position sensor (sub) is normally converted into a digital signal in the engine-ECU.
TROUBLE JUDGMENT
Check Condition
• Ignition switch is "ON" position.
Judgement Criterion
• When the input voltage from the accelerator
pedal position sensor (sub) is made 0 V periodically, the digital value of the input voltage indicates more than 0.2 V.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree position is in default
position.
PROBABLE CAUSE
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
13A-89
Code No. P060D: Trustful Check Accelerator Pedal Position Sensor
FUNCTION
• Compare the output value of the accelerator
pedal position sensor (main) with that of the
accelerator pedal position sensor (sub).
TROUBLE JUDGMENT
Check Condition
• Change of accelerator pedal position sensor
(sub) output voltage per 40 milliseconds is less
than 0.06 V.
Judgement Criterion
• Voltage obtained with the formula given below is
more than 0.4 V: accelerator pedal position sensor (main) output voltage − accelerator pedal
position sensor (sub) output voltage.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree position is in default
position.
PROBABLE CAUSES
• Failed accelerator pedal position sensor
• Harness damage in accelerator pedal position
sensor circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is any other diagnosis code than P060D set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 2. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 11: Accelerator pedal position sensor
(main)
b. Item 12: Accelerator pedal position sensor
(sub)
Q: Are the check results normal?
YES : Replace the engine-ECU.
NO : Perform the diagnosis code classified check
procedure for the sensor that has shown an
abnormal data value. Inspection chart for
diagnosis code (Refer to P.13A-23).
Code No. P061A: Torque Monitoring
FUNCTION
• Compares the actual torque signal computed
from an air flow sensor signal with the driver
demand torque signal computed from an accelerator pedal position sensor signal.
TROUBLE JUDGMENT
Check Conditions
• Engine speed is more than 500 r/min.
• Volumetric efficiency is more than 16 %.
Judgement Criterion
• Difference between the actual torque signal and
the requested torque signal is more than 50 N⋅m
for 1 second.
PROBABLE CAUSES
• Failed throttle valve control servo
• Harness damage in throttle valve control servo
circuit or loose connector contact.
• Failed intake air system
• There is some foreign matter around air flow sensor
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is any other diagnosis code than P061A set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree position is in default
position.
NO : Go to Step 2.
13A-90
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 2. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 10: Air flow sensor
b. Item 11: Accelerator pedal position sensor
(main)
c. Item 12: Accelerator pedal position sensor
(sub)
Q: Are the check results normal?
YES : Go to Step 3.
NO : Perform the diagnosis code classified check
procedure for the sensor that has shown an
abnormal data value. Inspection chart for
diagnosis code (Refer to P.13A-23).
STEP 3. Check air intake from inlet hose and inlet
manifold.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair.
STEP 4. Check air flow sensor
• Check that there is not foreign matter around air
flow sensor
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair.
STEP 5. Check throttle valve control servo itself.
• Throttle valve control servo check (Refer to
P.13A-189).
YES : Go to Step 6.
NO : Replace the throttle body assembly.
STEP 6. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
ETV-.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 7. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
ETV+.
• Check signal line for damage.
Q: Is the check result normal?
YES : Go to Step 8.
NO : Repair the damaged harness wire.
STEP 8. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Q: Is the check result normal?
Code No. P061C: Trustful Check Engine Speed
FUNCTION
• Compares the actual engine speed calculated
from the crank angle sensor signal cycle with the
estimated engine speed calculated from the
number of the crank angle sensor signal pulses
after a lapse of the specified time.
Judgement Criterion
• Difference between the engine speed monitored
with a 180 degree-cycle pulse and the engine
speed monitored with a 10 degree-cycle pulse is
more than 500 r/min.
TROUBLE JUDGMENT
Check Condition
• Engine speed monitored with a 180 degree-cycle
pulse is more than 500 r/min.
Check Condition
• Engine speed monitored with a 180 degree-cycle
pulse is more than 500 r/min.
Judgement Criterion
• Engine speed monitored with a 10 degree-cycle
pulse is more than 1,000 r/min.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree position is in default
position.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
PROBABLE CAUSE
• Failed engine-ECU
DIAGNOSIS PROCEDURE
13A-91
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 1. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
Code No. P061F: Fail-safe Control System
FUNCTION
• To judge whether fail-safe control can be performed, check that power supply to the throttle
valve control motor circuit can be stopped by
turning the throttle valve control servo relay to
OFF position momentarily.
TROUBLE JUDGMENT
Check Condition
• Ignition switch is "ON" position.
Judgement Criterion
• Power supply to the throttle valve control servo
cannot be shut down (though power supply is
stopped).
FAIL-SAFE AND BACKUP FUNCTION
• Microcomputer is reset.
PROBABLE CAUSES
• Failed throttle valve control servo relay circuit
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Go to Step 2.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 2. M.U.T.-III diagnosis code
Q: Is diagnosis code of P0657 set?
YES : Check throttle valve control servo power
system. Check code No. P0657: throttle
valve control servo relay circuit malfunction
(Refer to P.13A-94).
NO : Replace the engine-ECU.
Code No. P0622: Alternator FR Terminal System
OPERATION
• The energized state of the alternator field coil is
inputted from the alternator connector terminal to
the engine-ECU connector terminal ALTF.
FUNCTION
• A signal of the power supply duty ratio for the
alternator field coil is inputted to the engine-ECU.
• In response to the signal, the engine-ECU
detects the alternator output current and controls
the idling speed according to the output current
(electric load).
TROUBLE JUDGMENT
Check Condition
• Engine speed is more than 500 r/min.
Judgement Criterion
• Input voltage from the alternator FR terminal is
approximately battery positive voltage for 20 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• Prohibits alternator output suppression control
against current consumers. (operate as a normal
alternator.)
13A-92
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
PROBABLE CAUSES
• Failed alternator
• Open circuit or harness damage in alternator circuit or loose connector contact
• Failed engine-ECU
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
DIAGNOSIS PROCEDURE
STEP 1. Perform voltage measurement at
alternator connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU ALTF line
and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 4.
NO : Go to Step 2.
STEP 2. Check harness between alternator
connector terminal and engine-ECU connector
terminal ALTF.
• Check output line for open circuit.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. Check harness between alternator
connector terminal and engine-ECU connector
terminal ALTF.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair the damaged harness wire.
STEP 5. Perform voltage measurement at
engine-ECU connector.
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspection.
• Engine: Idle operation after warm-up
• Transmission: P range
• Radiator fan: Not operated
• Voltage between terminal ALTF and body earth.
OK: Voltage decreases when the headlamps
are extinguished → illuminated.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Replace the alternator.
STEP 3. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
Code No. P062F: EEPROM Malfunction
FUNCTION
• The engine-ECU checks whether information
such as idling learned value is stored.
TROUBLE JUDGMENT
PROBABLE CAUSE
• Failed engine-ECU
DIAGNOSIS PROCEDURE
Check Condition
• Ignition switch is "ON" position.
STEP 1. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Judgement Criterion
• The latest data that was flashed while the ignition
switch was in "LOCK" (OFF) position are not
stored correctly.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
FAIL-SAFE AND BACKUP FUNCTION
• None
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
13A-93
Code No. P0630: Chassis Number not Programmed
FUNCTION
• An engine-ECU checks whether vehicle chassis
number is stored or not.
TROUBLE JUDGMENT
Check Condition
• Ignition switch is "ON" position.
DIAGNOSIS PROCEDURE
STEP 1. Entered chassis number confirmed.
Q: Is a chassis number entered?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU with one into
which vehicle information is correctly
entered.
Judgement Criterion
• Chassis number has not been written.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSE
• Failed engine-ECU
Code No. P0638: Throttle Valve Control Servo Circuit Range/Performance Problem
OPERATION
• Check code No. P2101: throttle valve control
servo magneto malfunction (Refer to P.13A-102).
FUNCTION
• Engine-ECU checks the electronic controlled
throttle system for abnormal conditions.
TROUBLE JUDGMENT
Check Conditions
• Battery positive voltage is more than 8.3 V.
• Throttle position sensor (main) output voltage is
more than 0.2 V and is less than 4.8 V.
• Drop of throttle position sensor (main) output voltage per 100 milliseconds is more than 0.04 V.
Judgement Criterion
• Throttle position sensor (main) output voltage is
higher than the target throttle position sensor
(main) voltage by 0.5 V or more.
Check Conditions
• Battery positive voltage is more than 8.3 V.
• Throttle position sensor (main) output voltage is
more than 0.2 V and is less than 4.8 V.
• Target throttle position sensor (main) output voltage is less than 1.5 V.
Judgement Criterion
• Difference between throttle position sensor
(main) output voltage and target throttle position
sensor (main) voltage is more than 0.6 V.
Check Conditions
• Battery positive voltage is more than 8.3 V.
• Throttle position sensor (main) output voltage is
more than 0.2 V and is less than 4.8 V.
Judgement Criterion
• Difference between throttle position sensor
(main) output voltage and target throttle position
sensor (main) voltage is more than 1 V.
Check Condition
• Battery positive voltage is more than 8.3 V.
Judgement Criterion
• Throttle position sensor (main) default opening
learnt value is more than 4 V.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree position is in default
position.
PROBABLE CAUSES
•
•
•
•
Failed throttle valve return spring.
Failed throttle valve operation.
Failed throttle valve control servo.
Harness damage in throttle valve control servo
circuit or loose connector contact.
• Failed engine-ECU.
13A-94
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
DIAGNOSIS PROCEDURE
STEP 1. Check throttle body.
• Check whether the throttle valve return spring is
normal.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Replace the throttle body assembly.
STEP 2. Check throttle valve control servo itself.
• Electronic-controlled throttle valve control check.
• Throttle valve control servo check (Refer to
P.13A-189).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
the throttle body assembly.
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
ETV-.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 5. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 3. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
ETV+.
• Check signal line for damage.
Q: Is the check result normal?
Code No. P0642: Throttle Position Sensor Power Supply
PROBABLE CAUSE
FUNCTION
• Engine-ECU checks the throttle position sensor
power voltage for abnormal conditions.
TROUBLE JUDGMENT
Check Condition
• Battery positive voltage is more than 6.3 V.
Judgement Criterion
• Throttle position sensor power voltage is less
than 4.3 V.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree position is in default
position.
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P0657: Throttle Valve Control Servo Relay Circuit Malfunction
OPERATION
• Battery voltage is applied to the throttle valve
control servo relay terminal connector terminal.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
• Battery voltage is applied to the throttle valve
control servo relay terminal connector terminal
from the engine control relay connector terminal.
• Engine-ECU connector terminal C/RL applies
current to the throttle valve control servo relay
coil by turning ON the power transistor in the unit
in order to turn the relay ON.
• When the throttle valve control servo relay turns
ON, battery voltage is supplied by the throttle
valve control servo relay connector terminal to
the engine-ECU connector terminal RSB.
FUNCTION
• When the ignition switch ON signal is input into
the engine-ECU, the engine-ECU turns ON the
throttle valve control servo.
13A-95
TROUBLE JUDGMENT
Check Condition
• Battery positive voltage is more than 8.3 V.
Judgement Criterion
• The power line voltage of the electronic-controlled throttle system is less than 6.0 V.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree position is in default
position.
PROBABLE CAUSES
• Failed throttle valve control servo relay
• Open/short circuit or harness damage in throttle
valve control servo relay circuit or loose connector contact.
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check throttle valve control servo relay
itself.
• Throttle valve control servo relay connector
check.
• Throttle valve control servo relay check (Refer to
P.13A-185).
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair or replace the connector, or replace
the throttle valve control servo relay.
STEP 2. Perform voltage measurement at throttle
valve control servo relay connector.
• Remove relay, and measure at relay box side.
• Voltage between terminal power supply line and
body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or check
and repair harness between throttle valve
control servo relay connector terminal
power supply line and battery.
• Check power supply line for
open/short circuit.
YES : Go to Step 5.
NO : Repair or replace the connector, or check
and repair harness between throttle valve
control servo relay connector terminal and
engine-ECU connector terminal C/RL.
• Check earthing line for open/short
STEP 3. Perform voltage measurement at throttle
valve control servo relay connector.
• Remove relay, and measure at relay box side.
• Ignition switch: ON
• Voltage between terminal engine control relay
line and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or check
and repair harness between engine control
relay connector terminal and throttle valve
control servo relay connector terminal.
• Check power supply line for
open/short circuit.
STEP 4. Perform voltage measurement at
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Short-circuit engine-ECU connector the terminal
C/R to the body earth.
• Voltage between terminal C/RL and body earth.
OK: System voltage
Q: Is the check result normal?
circuit.
13A-96
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 5. Perform voltage measurement at
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Short-circuit engine-ECU connector terminals
C/R and C/RL to the body earth.
• Voltage between terminal RSB and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 8.
NO : Go to Step 6.
STEP 6. Check harness between throttle valve
control servo relay connector terminal and
engine-ECU connector terminal RSB.
• Check output line for open/short circuit.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 7. Check harness between engine control
relay connector terminal and throttle valve
control servo relay connector terminal.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Repair or replace the connector, or check
STEP 8. Check harness between throttle valve
control servo relay connector terminal and
battery.
• Check power supply line for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 9.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 9. Check harness between throttle valve
control servo relay connector terminal and
engine-ECU connector terminal RSB.
• Check output line for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 10.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 10. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
and repair harness between throttle valve
control servo relay connector terminal and
engine-ECU connector terminal C/RL.
• Check earthing line for damage.
NO : Repair or replace the connector, or repair
the damaged harness wire.
Code No. P1231: Trustful Check Active Stability Control (ASC) <Vehicles with ASC>
FUNCTION
• Checks for an abnormal signal of active stability
control (ASC) via the CAN communication.
TROUBLE JUDGMENT
Check Condition
• Ignition switch is "ON" position.
Judgment Criterion
• A torque demand signal from the active stability
control (ASC) is abnormal.
FAIL-SAFE AND BACKUP FUNCTION
• Torque requested by active stability control (ASC)
is ignored.
PROBABLE CAUSES
• Failed active stability control system
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Go to Step 2.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
13A-97
STEP 2. M.U.T.-III diagnosis code
• Confirm the diagnosis code is set from the
ASC-ECU.
Q: Is diagnosis code set?
YES : Perform troubleshooting of the active
stability control system (ASC) (Refer to
GROUP 35C − Troubleshooting − Diagnosis
Code Chart ).
NO : Replace the engine-ECU.
Code No. P1238: Air Flow Sensor Trustful For Torque Monitoring
FUNCTION
• Compare the actual measurement of volumetric
efficiency by an air flow sensor signal with volumetric efficiency estimated from a throttle position
sensor (main and sub) signal.
TROUBLE JUDGMENT
Check Conditions
• Difference between the actual volumetric efficiency and the volumetric efficiency estimated by
the throttle position sensor (main) is more than 0
%. Or, the volumetric efficiency is less than 60 %.
• Engine speed is more than 750 r/min.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree position is in default
position.
PROBABLE CAUSES
• Failed air flow sensor
• Harness damage in air flow sensor circuit or
loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Judgement Criterion
• Difference between the actual volumetric efficiency and the volumetric efficiency estimated by
the throttle position sensor (main) is more than 35
%.
Q: Is any other diagnosis code than P1238 set?
YES : Inspection chart for diagnosis code (Refer
Check Conditions
• Difference between the actual volumetric efficiency and the volumetric efficiency estimated by
the throttle position sensor (sub) is more than 0
%. Or, the volumetric efficiency is less than 60 %.
• Engine speed is more than 750 r/min.
STEP 2. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 10: Air flow sensor
Judgement Criterion
• Difference between the actual volumetric efficiency and the volumetric efficiency estimated by
the throttle position sensor (sub) is more than 35
%.
to P.13A-23).
NO : Go to Step 2.
Q: Is the check result normal?
YES : Replace the engine-ECU.
NO : Check air flow sensor system. Check code
No. P0102: air flow sensor circuit low input
(Refer to P.13A-33. Check code No. P0103:
air flow sensor circuit high input (Refer to
P.13A-35).
Code No. P1240: Trustful Check Ignition Angle <Vehicles with ASC>
FUNCTION
• Checks for an abnormal ignition timing retard
angle demand signal from the active stability control (ASC).
TROUBLE JUDGMENT
Check Condition
• Ignition switch is "ON" position.
13A-98
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
Judgment Criterion
• Ignition timing retard angle demand signal is
abnormal.
FAIL-SAFE AND BACKUP FUNCTION
• Ignition retard is not carried out.
PROBABLE CAUSES
• Failed active stability control system
• Failed engine-ECU
DIAGNOSIS PROCEDURE
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 2. M.U.T.-III diagnosis code
• Confirm the diagnosis code is set from the
ASC-ECU.
Q: Is diagnosis code set?
YES : Perform troubleshooting of the active
stability control system (ASC) (Refer to
GROUP 35C − Troubleshooting − Diagnosis
Code Chart ).
NO : Replace the engine-ECU.
STEP 1. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code related to CAN communication
set?
Code No. P1242: Fail-safe Control Monitoring
FUNCTION
• Monitors the engine speed during fail-safe control.
TROUBLE JUDGMENT
Check Condition
• During fail safe control.
Judgement Criterion
• Engine speed is more than assumed.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree position is default position.
PROBABLE CAUSE
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is any other diagnosis code than P1242 set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 2. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P1243: Inquiry/Response Error
FUNCTION
• Monitors the computation function of the
engine-ECU.
TROUBLE JUDGMENT
Check Condition
• Ignition switch is "ON" position.
Judgement Criterion
• Engine-ECU can not calculate input data.
FAIL-SAFE AND BACKUP FUNCTION
• Microcomputer is reset.
PROBABLE CAUSE
• Failed engine-ECU
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
13A-99
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P1247: Trustful Check CVT
FUNCTION
DIAGNOSIS PROCEDURE
• Checks for an abnormal signal of CVT.
TROUBLE JUDGMENT
Check Condition
• Ignition switch is "ON" position.
Judgement Criterion
• A torque demand signal from CVT-ECU is abnormal.
STEP 1. M.U.T.-III diagnosis code
• Confirm the diagnosis code is set from the
CVT-ECU.
Q: Is diagnosis code set?
YES : Perform troubleshooting of CVT system
(Refer to GROUP 23A − Diagnosis Code
Chart ).
NO : Go to Step 2.
FAIL-SAFE AND BACKUP FUNCTION
• Torque requested by CVT-ECU is ignored.
PROBABLE CAUSE
• Failed engine-ECU
STEP 2. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P1590: CVT-ECU to Engine-ECU Communication Error in Torque Reduction Request
FUNCTION
• The engine-ECU monitors and checks communication with the CVT-ECU.
TROUBLE JUDGMENT
Check Condition
• Ignition switch is "ON" position.
Judgement Criterion
• Engine-ECU detects an error in communication
between engine-ECU and CVT-ECU.
PROBABLE CAUSE
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is diagnosis code of U0101 set?
YES : Perform troubleshooting of CVT-ECU
time-out. Check code No. U0101 CVT-ECU
time-out (Refer to P.13A-114).
NO : Go to Step 2.
FAIL-SAFE AND BACKUP FUNCTION
• Engine output is restricted.
STEP 2. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
13A-100
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P1603: Battery Backup Circuit Malfunction
OPERATION
• Power is directly supplied to the engine-ECU
connector terminal BACK from the battery.
FUNCTION
• The engine-ECU checks open circuit in the battery backup line.
TROUBLE JUDGMENT
Check Conditions
• Engine starting sequence was completed.
• Battery positive voltage is more than 10 V.
Judgment Criterion
• Battery backup line voltage is less than 6 V for 2
seconds.
FAIL-SAFE AND BACKUP FUNCTION
• All diagnosis codes are stored once failure judgment is completed.
PROBABLE CAUSES
• Open/short circuit or harness damage in battery
backup line circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
• Temporarily place the ignition switch in LOCK
(OFF) position, and 10 seconds after that, place it
in ON position again.
STEP 2. Perform voltage measurement at
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Voltage between terminal BACK and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or check
and repair harness between the battery and
engine-ECU connector terminal BACK.
• Check power supply line for
open/short circuit.
STEP 3. Check harness between the battery and
engine-ECU connector terminal BACK.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Q: Is the diagnosis code of P1603 set?
YES : Go to Step 2.
NO : Check end.
Code No. P2100: Throttle Valve Control Servo Circuit (open)
OPERATION
• Controls the current that is applied from the
engine-ECU connector terminals ETV+, ETV- to
the electronic-controlled throttle valve connector
terminals.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
FUNCTION
• Engine-ECU varies the direction and the amperage of the current that is applied to the throttle
valve control servo in order to control the opening
of the throttle valve.
TROUBLE JUDGMENT
Check Conditions
• Battery positive voltage is more than 8.3 V.
• Difference between the throttle position sensor
(main) output voltage and the target throttle position sensor (main) voltage is more than 0.1 V.
• Difference between the throttle position sensor
(sub) output voltage and the target throttle position sensor (sub) voltage is more than 0.1 V.
• The drive duty of the throttle valve control servo
is more than 100 %.
• Except while engine is being cranked.
or
• Battery positive voltage is more than 8.3 V.
• Difference between the target throttle position
sensor (main) voltage and the throttle position
sensor (main) output voltage is more than 0.1 V.
• Difference between the target throttle position
sensor (sub) voltage and the throttle position sensor (sub) output voltage is more than 0.1 V.
• The drive duty of the throttle valve control servo
is more than 100 %.
• Except while engine is being cranked.
Judgement Criterion
• Difference between the throttle position sensor
(main) output voltage and the learning value of
the middle-opened degree is less than 0.2 V.
or
• Difference between the throttle position sensor
(sub) output voltage and the learning value of the
middle-opened degree is less than 0.2 V.
13A-101
DIAGNOSIS PROCEDURE
STEP 1. Check throttle valve control servo itself.
• Electronic-controlled throttle valve control check.
• Throttle valve control servo check (Refer to
P.13A-189).
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair or replace the connector, or replace
the throttle body assembly.
STEP 2. Perform resistance measurement at
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal RSG, RSH and
body earth.
OK: Continuity (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or check
and repair harness between engine-ECU
connector terminal RSG, RSH and body
earth.
• Check earthing line for open circuit
and damage.
STEP 3. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
ETV+.
• Check output line for open circuit and damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree position is in default
position.
PROBABLE CAUSES
• Failed throttle valve control servo.
• Open circuit or harness damage in throttle valve
control servo circuit or lose connector contact.
• Failed engine-ECU
STEP 4. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
ETV-.
• Check signal line for open circuit and damage.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 5. M.U.T-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
13A-102
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P2101: Throttle Valve Control Servo Magneto Malfunction
OPERATION
• Controls the current that is applied from the
engine-ECU connector terminals ETV+, ETV- to
the electronic-controlled throttle valve connector
terminals.
FUNCTION
• Engine-ECU check whether the throttle valve
control servo magneto failed.
TROUBLE JUDGMENT
Check Condition
• Battery positive voltage is more than 8.3 V.
Judgement Criterion
• The coil current of the throttle valve control servo
is more than 8 A.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree position is in default
position.
PROBABLE CAUSES
• Failed throttle valve control servo.
• Short circuit or harness damage in throttle valve
control servo circuit or lose connector contact.
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check throttle valve control servo itself.
• Electronic-controlled throttle valve control check.
• Throttle valve control servo check (Refer to
P.13A-189).
YES : Go to Step 2.
NO : Repair or replace the connector, or replace
the throttle body assembly.
STEP 2. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
ETV+.
• Check output line for short circuit and damage.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 3. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
ETV-.
• Check signal line for short circuit and damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Q: Is the check result normal?
Code No. P2122: Accelerator Pedal Position Sensor (main) Circuit Low Input
OPERATION
• A power voltage of 5 V is applied to the accelerator pedal position sensor connector terminal from
the engine-ECU connector terminal APS5.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
• The power voltage is earthed to the engine-ECU
connector terminal APSE from the accelerator
pedal position sensor connector terminal.
• The sensor signal is inputted to the engine-ECU
connector terminal APSM from the accelerator
pedal position sensor output terminal.
FUNCTION
• The accelerator pedal position sensor (main) outputs voltage which corresponds to the accelerator pedal depression.
• The engine-ECU checks whether the voltage is
within a specified range.
13A-103
STEP 2. Perform voltage measurement at
accelerator pedal position sensor connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU APS5 line
and body earth.
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 3.
Check Condition
• Ignition switch is "ON" position.
STEP 3. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal APS5.
• Check power supply line for open/short circuit.
Judgement Criterion
• Accelerator pedal position sensor (main) output
voltage is less than 0.2 V.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
TROUBLE JUDGMENT
the damaged harness wire.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree is restricted.
• Throttle opening degree position is in default
position if accelerator pedal position sensor (sub)
fails.
PROBABLE CAUSES
• Failed accelerator pedal position sensor
• Open/short circuit or harness damage in accelerator pedal position sensor circuit or loose connector contact
• Failed engine-ECU
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 11: Accelerator pedal position sensor
(main)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 11: Accelerator pedal position sensor
(main)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 5. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal APS5.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 6. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal APSM.
• Check output line for open/short circuit and damage.
Q: Is the check result normal?
13A-104
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Go to Step 7.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 7. Replace the accelerator pedal assembly
• After replacing the accelerator pedal assembly,
reconfirm whether the diagnosis code is set.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
Code No. P2123: Accelerator Pedal Position Sensor (main) Circuit High Input
OPERATION
• A power voltage of 5 V is applied to the accelerator pedal position sensor connector terminal from
the engine-ECU connector terminal APS5.
• The power voltage is earthed to the engine-ECU
connector terminal APSE from the accelerator
pedal position sensor connector terminal.
• The sensor signal is inputted to the engine-ECU
connector terminal APSM from the accelerator
pedal position sensor output terminal.
FUNCTION
• The accelerator pedal position sensor (main) outputs voltage which corresponds to the accelerator pedal depression.
• The engine-ECU checks whether the voltage is
within a specified range.
TROUBLE JUDGMENT
Check Condition
• Ignition switch is "ON" position.
Judgement Criterion
• Accelerator pedal position sensor (main) output
voltage is more than 4.8 V.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 11: Accelerator pedal position sensor
(main)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Perform resistance measurement at
accelerator pedal position sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal engine-ECU APSE
line and body earth.
OK: Continuity (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 3.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree is restricted.
• Throttle opening degree position is in default
position if accelerator pedal position sensor (sub)
fails.
PROBABLE CAUSES
• Failed accelerator pedal position sensor
• Open circuit or harness damage in accelerator
pedal position sensor circuit or loose connector
contact
• Failed engine-ECU
STEP 3. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal APSE.
• Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 11: Accelerator pedal position sensor
(main)
Q: Is the check result normal?
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
13A-105
STEP 5. Replace the accelerator pedal assembly
• After replacing the accelerator pedal assembly,
reconfirm whether the diagnosis code is set.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
Code No. P2127: Accelerator Pedal Position Sensor (sub) Circuit Low Input
OPERATION
• A power voltage of 5 V is applied to the accelerator pedal position sensor connector terminal from
the engine-ECU connector terminal 5VV.
• The power voltage is earthed to the engine-ECU
connector terminal EV from the accelerator pedal
position sensor connector terminal.
• The sensor signal is inputted to the engine-ECU
connector terminal APSS from the accelerator
pedal position sensor output terminal.
FUNCTION
• The accelerator pedal position sensor (sub) outputs voltage which corresponds to the accelerator pedal depression.
• The engine-ECU checks whether the voltage is
within a specified range.
TROUBLE JUDGMENT
Check Condition
• Ignition switch is "ON" position.
Judgement Criterion
• Accelerator pedal position sensor (sub) output
voltage is less than 0.2 V.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree is restricted.
• Throttle opening degree position is in default
position if accelerator pedal position sensor
(main) fails.
PROBABLE CAUSES
• Failed accelerator pedal position sensor
• Open/short circuit or harness damage in accelerator pedal position sensor circuit or loose connector contact
• Failed engine-ECU
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 12: Accelerator pedal position sensor
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 12: Accelerator pedal position sensor
(sub)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Perform voltage measurement at
accelerator pedal position sensor connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU 5VV and
body earth.
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 3.
STEP 3. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal 5VV.
• Check power supply line for open/short circuit.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
(sub)
Q: Is the check result normal?
13A-106
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
STEP 5. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal 5VV.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 6. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal APSS.
• Check output line for open/short circuit and damage.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 7. Replace the accelerator pedal assembly
• After replacing the accelerator pedal assembly,
reconfirm whether the diagnosis code is set.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
Code No. P2128: Accelerator Pedal Position Sensor (sub) Circuit High Input
OPERATION
• A power voltage of 5 V is applied to the accelerator pedal position sensor connector terminal from
the engine-ECU connector terminal 5VV.
• The power voltage is earthed to the engine-ECU
connector terminal EV from the accelerator pedal
position sensor connector terminal.
• The sensor signal is inputted to the engine-ECU
connector terminal APSS from the accelerator
pedal position sensor output terminal.
FUNCTION
• The accelerator pedal position sensor (sub) outputs voltage which corresponds to the accelerator pedal depression.
• The engine-ECU checks whether the voltage is
within a specified range.
TROUBLE JUDGMENT
Check Condition
• Ignition switch is "ON" position.
Judgement Criterion
• Accelerator pedal position sensor (sub) output
voltage is more than 2.5 V.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree is restricted.
• Throttle opening degree position is in default
position if accelerator pedal position sensor
(main) fails.
YES : Go to Step 5.
PROBABLE CAUSES
• Failed accelerator pedal position sensor
• Open circuit or harness damage in accelerator
pedal position sensor circuit or loose connector
contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 12: Accelerator pedal position sensor
(sub)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Perform resistance measurement at
accelerator pedal position sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal engine-ECU EV
line and body earth.
OK: Continuity (2 Ω or less)
Q: Is the check result normal?
NO : Go to Step 3.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 3. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal EV.
• Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 12: Accelerator pedal position sensor
(sub)
13A-107
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
STEP 5. Replace the accelerator pedal assembly
• After replacing the accelerator pedal assembly,
reconfirm whether the diagnosis code is set.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
Q: Is the check result normal?
Code No. P2135: Throttle Position Sensor (main and sub) Range/Performance Problem
OPERATION
• Check code No. P0122: throttle position sensor
(main) circuit low input (Refer to P.13A-45).
• Check code No. P0222: throttle position sensor
(sub) circuit low input (Refer to P.13A-60).
FUNCTION
• Engine-ECU checks the throttle position sensor
output signal characteristics for abnormal conditions.
TROUBLE JUDGMENT
Check Conditions
• Ignition switch is "ON" position.
• Throttle position sensor (main) output voltage is
more than 0.2 V and is less than 4.8 V.
• Throttle position sensor (sub) output voltage is
more than 0.2 V and is less than 4.8 V.
Judgement Criterion
• The sum of the output voltage of the throttle position sensors (main and sub) is less than 4.5 V, or
more than 5.5 V.
Check Conditions
• Throttle position sensor (main) output voltage is
more than 0.2 V and is less than 4.8 V.
• Throttle position sensor (sub) output voltage is
more than 0.2 V and is less than 4.8 V.
• Ignition switch is "ON" position.
• Throttle position sensor (main and sub) output
voltage is less than the target throttle position
sensor (main) voltage by 0.9 V or less.
Judgement Criterion
• Voltage obtained with the formula given below is
more than 0.3 V: throttle position sensor (main)
voltage − throttle position sensor (sub) voltage
NOTE: The throttle position sensor voltage used for
the judgment is converted into the throttle position
sensor voltage for the internal processing by the
engine-ECU.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree position is in default
position.
PROBABLE CAUSES
• Failed throttle position sensor
• Harness damage in throttle position sensor circuit
or loose connector contact
DIAGNOSIS PROCEDURE
STEP 1. Perform resistance measurement at
electronic-controlled throttle valve connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal engine-ECU TPSE
line and body earth.
OK: Continuity (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 4.
NO : Go to Step 2.
13A-108
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 2. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
TPSE.
• Check earthing line for damage.
STEP 5. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
TPSM.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, repair the
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector repair the
damaged harness wire.
STEP 3. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 4. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
TPS5.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector repair the
damaged harness wire.
STEP 6. Check harness between
electronic-controlled throttle valve connector
terminal and engine-ECU connector terminal
TPSS.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair or replace the connector repair the
damaged harness wire.
STEP 7. Replace throttle body assembly.
• After replacing the throttle body assembly, reconfirm whether the diagnosis code is set.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
damaged harness wire.
Code No. P2138: Accelerator Pedal Position Sensor (main and sub) Range/Performance Problem
OPERATION
• Check code No. P2122: accelerator pedal position sensor (main) circuit low input (Refer to
P.13A-102).
• Check code No. P2127: accelerator pedal position sensor (sub) circuit low input (Refer to
P.13A-105).
FUNCTION
• Engine-ECU checks the accelerator pedal position sensor output signal characteristics for
abnormal conditions.
TROUBLE JUDGMENT
Check Conditions
• Ignition switch is "ON" position.
• Change of accelerator pedal position sensor
(sub) output voltage per 25 milliseconds is less
than 0.06 V.
Judgement Criterion
• Voltage obtained with the formula given below is
more than 0.4 V: accelerator pedal position sensor (sub) voltage − accelerator pedal position
sensor (main) voltage
NOTE: The accelerator pedal position sensor voltage used for the judgment is converted into the
accelerator pedal position sensor voltage for the
internal processing by the engine-ECU.
Check Conditions
• Ignition switch is "ON" position.
• Change of accelerator pedal position sensor
(main) output voltage per 25 milliseconds is less
than 0.06 V.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
Judgement Criterion
• Voltage obtained with the formula given below is
more than 0.4 V: accelerator pedal position sensor (main) voltage − accelerator pedal position
sensor (sub) voltage
NOTE: The accelerator pedal position sensor voltage used for the judgment is converted into the
accelerator pedal position sensor voltage for the
internal processing by the engine-ECU.
FAIL-SAFE AND BACKUP FUNCTION
• Throttle opening degree is restricted.
• Throttle opening degree position is in default
position if accelerator pedal position sensor (sub)
fails.
PROBABLE CAUSES
• Failed accelerator pedal position sensor
• Harness damage in accelerator pedal position
sensor circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Perform resistance measurement at
accelerator pedal position sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal engine-ECU APSE
line and body earth.
OK: Continuity (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 4.
NO : Go to Step 2.
STEP 2. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal APSE.
• Check earthing line for damage.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 3. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is diagnosis code set?
13A-109
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 4. Perform resistance measurement at
accelerator pedal position sensor connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal engine-ECU EV
line and body earth.
OK: Continuity (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 6.
NO : Go to Step 5.
STEP 5. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal EV.
• Check earthing line for damage.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 6. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal APS5.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 7. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal 5VV.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 8.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 8. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal APSM.
• Check output line for damage.
Q: Is the check result normal?
13A-110
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Go to Step 9.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 9. Check harness between accelerator
pedal position sensor connector terminal and
engine-ECU connector terminal APSS.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 10. Replace the accelerator pedal assembly
• After replacing the accelerator pedal assembly,
reconfirm whether the diagnosis code is set.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
Code No. P2228: Barometric Pressure Sensor Circuit Low Input
FUNCTION
• The barometric pressure sensor converts the barometric pressure into a voltage signal and inputs
the signal to the engine-ECU.
• In response to the signal, the engine-ECU corrects the fuel injection amount, etc.
TROUBLE JUDGMENT
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• Battery positive voltage is more than 8 V.
Judgement Criterion
• Barometric pressure sensor output signal is less
than 49 kPa (approximately 4,600m above sea
level) for 10 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• Control as if the barometric pressure is 101 kPa.
PROBABLE CAUSE
• Failed barometric pressure sensor
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Code No. P2229: Barometric Pressure Sensor Circuit High Input
FUNCTION
• The barometric pressure sensor converts the barometric pressure into a voltage signal and inputs
the signal to the engine-ECU.
• In response to the signal, the engine-ECU corrects the fuel injection amount, etc.
TROUBLE JUDGMENT
Check Conditions
• More than 2 seconds have passed since the
engine starting sequence was completed.
• Battery positive voltage is more than 8 V.
Judgement Criterion
• Barometric pressure sensor output signal is more
than 113 kPa (approximately 1,200 m below sea
level) for 10 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• Control as if the barometric pressure is 101 kPa.
PROBABLE CAUSE
• Failed barometric pressure sensor
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
DIAGNOSIS PROCEDURE
13A-111
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 1. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
Code No. P2252: Oxygen Sensor Offset Circuit Low Voltage
OPERATION
• Check code No. P0131: oxygen sensor (front) circuit low voltage (Refer to P.13A-49).
• Check code No. P0137: oxygen sensor (rear) circuit low voltage (Refer to P.13A-54).
FUNCTION
• The engine-ECU watches and checks whether
the offset voltage of the oxygen sensor is normal
or not.
TROUBLE JUDGMENT
Check Condition
• More than 2 seconds have passed since the
engine starting sequence was completed.
Judgement Criterion
• Oxygen sensor offset voltage is less than 0.4 V
for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed oxygen sensor (front)
• Failed oxygen sensor (rear)
• Short circuit in oxygen sensor (front) circuit or
loose connector contact
• Short circuit in oxygen sensor (rear) circuit or
loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check oxygen sensor (front) itself.
• Oxygen sensor (front) connector check.
• Oxygen sensor check (Refer to P.13A-186).
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair or replace the connector, or replace
the oxygen sensor.
STEP 2. Check oxygen sensor (rear) itself.
• Oxygen sensor (rear) connector check.
• Oxygen sensor check (Refer to P.13A-186).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
the oxygen sensor (rear).
STEP 3. Perform voltage measurement at oxygen
sensor (front) connector.
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspection.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU OFLE line
and body earth.
OK: 0.4 − 0.6 V
Q: Is the check result normal?
YES : Go to Step 6.
NO : Go to Step 4.
STEP 4. Check harness between oxygen sensor
(front) connector terminal and engine-ECU
connector terminal OFLE.
• Check earthing line for short circuit.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 5. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
13A-112
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 6. Perform voltage measurement at oxygen
sensor (rear) connector.
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspection.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU ORLE line
and body earth.
OK: 0.4 − 0.6 V
YES : Go to Step 5.
NO : Go to Step 7.
STEP 7. Check harness between oxygen sensor
(rear) connector terminal and engine-ECU
connector terminal ORLE.
• Check earthing line for short circuit.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
Q: Is the check result normal?
Code No. P2253: Oxygen Sensor Offset Circuit High Voltage
OPERATION
• Check code No. P0131: oxygen sensor (front) circuit low voltage (Refer to P.13A-49).
• Check code No. P0137: oxygen sensor (rear) circuit low voltage (Refer to P.13A-54).
FUNCTION
• The engine-ECU watches and checks whether
the offset voltage of the oxygen sensor is normal
or not.
TROUBLE JUDGMENT
Check Condition
• More than 2 seconds have passed since the
engine starting sequence was completed.
Judgement Criterion
• Oxygen sensor offset voltage is more than 0.6 V
for 2 seconds.
FAIL-SAFE AND BACKUP FUNCTION
• Does not control air-fuel ratio closed loop.
PROBABLE CAUSES
• Failed oxygen sensor (front)
• Failed oxygen sensor (rear)
• Short circuit in oxygen sensor (front) circuit or
loose connector contact
• Short circuit in oxygen sensor (rear) circuit or
loose connector contact
• Failed engine-ECU
STEP 4. Check harness between oxygen sensor
(front) connector terminal and engine-ECU
connector terminal OFLE.
• Check earthing line for short circuit.
DIAGNOSIS PROCEDURE
STEP 1. Check oxygen sensor (front) itself.
• Oxygen sensor (front) connector check.
• Oxygen sensor check (Refer to P.13A-186).
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair or replace the connector, or replace
the oxygen sensor (front).
STEP 2. Check oxygen sensor (rear) itself.
• Oxygen sensor (rear) connector check.
• Oxygen sensor check (Refer to P.13A-186).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
the oxygen sensor (rear).
STEP 3. Perform voltage measurement at
engine-ECU connector.
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspection.
• Ignition switch: "ON"
• Voltage between terminal OFLE and body earth.
OK: 0.4 − 0.6 V
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 4.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 5. Check harness between oxygen sensor
(front) connector terminal and engine-ECU
connector terminal O2FL.
• Check output line for short circuit.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 6. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 7. Perform voltage measurement at
engine-ECU connector.
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspection.
• Ignition switch: "ON"
• Voltage between terminal ORLE and body earth.
OK: 0.4 − 0.6 V
13A-113
YES : Go to Step 6.
NO : Go to Step 8.
STEP 8. Check harness between oxygen sensor
(rear) connector terminal and engine-ECU
connector terminal ORLE.
• Check earthing line for short circuit.
Q: Is the check result normal?
YES : Go to Step 9.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 9. Check harness between oxygen sensor
(rear) connector terminal and engine-ECU
connector terminal O2RL.
• Check output line for short circuit.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
the damaged harness wire.
Q: Is the check result normal?
Code No. P2530: Ignition Switch-IG1 Circuit
CAUTION
• When the ETACS-ECU of vehicles without
KOS is replaced, the encrypted code of the
ignition key needs to be registered to the
ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in
GROUP 54A, Immobilizer System − How to
Register Key ID .)
OPERATION
• When the ignition switch is turned on, the ignition
switch ON signal is input into the engine-ECU
connector terminal IGN and also into the
ETACS-ECU.
FUNCTION
• The engine-ECU compares the ignition switch
ON signal sent from the ignition switch <Vehicles
without KOS> or OSS-ECU <Vehicles with KOS>
with ignition switch information sent from
ETACS-ECU. The engine-ECU checks for the
abnormality.
TROUBLE JUDGMENT
Check Condition
• Ignition switch: "ON" → "LOCK" (OFF)
Judgement Criterion
• While the ignition switch ON signal is input into
the engine-ECU, the ignition switch information,
sent from the ETACS-ECU via CAN, is turned to
OFF from ON. This allows the CAN to be
stopped.
13A-114
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Short circuit in ignition switch-IG1 circuit or loose
connector contact
• Failed CAN
• Failed ETACS-ECU
• Failed engine-ECU
STEP 3. Check harness between engine-ECU
connector terminal IGN and ETACS-ECU
connector terminal IGN.
• Check signal line for short circuit.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
DIAGNOSIS PROCEDURE
STEP 4. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
STEP 1. M.U.T.-III CAN bus diagnosis
• Use M.U.T.-III to perform CAN bus line diagnosis.
Q: Is diagnosis code set?
YES : Go to Step 5.
NO : Intermittent malfunction (Refer to GROUP
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair CAN bus line (Refer to GROUP 54C
− Troubleshooting − CAN Bus Diagnostics
Table ).
STEP 2. M.U.T.-III diagnosis code
• Confirm the diagnosis code is set from
ETACS-ECU.
Q: Is diagnosis code set?
YES : Perform troubleshooting of ETACS (Refer to
GROUP 54A − ETACS − Diagnosis Code
Chart ).
NO : Go to Step 3.
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 5. Replace the ETACS-ECU
• After replacing the ETACS-ECU, reconfirm
whether the diagnosis code is set.
Q: Is the diagnosis code set?
YES : Replace the engine-ECU.
NO : Check end.
Code No. U0101: CVT-ECU Time-out
CAUTION
If diagnosis code U0101 is set from engine-ECU,
surely perform CAN bus line diagnosis.
CAUTION
Replace ECU after certainly confirming that the
communication circuits are normal.
TROUBLE JUDGMENT
Check Conditions
• More than 2 seconds have passed since the ignition switch was turned to "ON" position.
• Battery positive voltage is more than 10 V and is
less than 16 V.
Judgement Criterion
• Unable to receive CVT-ECU signals through the
CAN bus line for 4 seconds.
COMMENTS ON TROUBLE SYMPTOM
Current malfunction
• The failure is possibly caused by malfunction of
the harness and connector in CAN bus line
between engine-ECU and CVT-ECU, by malfunction in the power supply system of CVT-ECU, in
CVT-ECU itself, in engine-ECU.
Past malfunction
• Proceed with troubleshooting focusing on malfunction of the harness and connector in CAN
bus line between engine-ECU and CVT-ECU and
malfunction in the power supply system of
CVT-ECU. For diagnosis procedure, refer to how
to cope with past malfunctions. (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points − How to Treat Past Trouble ).
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
NOTE: In the case of past malfunctions, M.U.T.-III
CAN bus line diagnosis cannot detect a malfunction even if there is a malfunction in CAN bus.
Therefore, check CAN bus line as in the case of
response to intermittent malfunctions (Refer to
GROUP 00 − How to Use Troubleshooting/Inspection Service Points − How to Cope with
Intermittent Malfunctions ). It is possible to narrow down areas with a high possibility of malfunctions from diagnosis codes set to each ECU that
performs CAN communication (Refer to GROUP
54C − Explanation about the M.U.T.-III CAN Bus
Diagnostics ).
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed harness and connector
• Failed CVT-ECU
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
• Use M.U.T.-III to perform CAN bus line diagnosis.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair CAN bus line (Refer to GROUP 54C
− Troubleshooting − CAN Bus Diagnostics
Table ). After repairing CAN bus line, go to
Step 6 .
STEP 2. M.U.T.-III diagnosis code
• Confirm the diagnosis code is set from the
CVT-ECU.
Q: Is diagnosis code set?
YES : Perform troubleshooting of CVT (Refer to
GROUP 23A − Diagnosis Code Chart ).
NO : Go to Step 3.
STEP 3. M.U.T.-III diagnosis code
Check that the other ECU performing CAN communication with CVT-ECU sets diagnosis code No. U0101
[Refer to GROUP 54C − CAN Communication-related Diagnosis Code (U-code) Table ].
Q: Is diagnosis code set?
13A-115
YES : Go to Step 4.
NO : Go to Step 5.
STEP 4. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the
engine-ECU.
1. Erase the set diagnosis code.
2. Ignition switch: "LOCK" (OFF) → "ON"
3. Confirm whether the diagnosis code is set.
Q: Is diagnosis code set?
YES : After replacing CVT-ECU, go to Step 6.
NO : Intermittent malfunction in CAN bus line
between engine-ECU and CVT-ECU (Refer
to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 5. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the
engine-ECU.
1. Erase the set diagnosis code.
2. Ignition switch: "LOCK" (OFF) → "ON"
3. Confirm whether the diagnosis code is set.
Q: Is diagnosis code set?
YES : Replace engine-ECU, go to Step 6.
NO : Intermittent malfunction in CAN bus line
between engine-ECU and CVT-ECU (Refer
to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 6. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the
engine-ECU.
1. Erase the set diagnosis code.
2. Ignition switch: "LOCK" (OFF) → "ON"
3. Confirm whether the diagnosis code is set.
Q: Is diagnosis code set?
YES : Go to Step 1.
NO : Check end.
13A-116
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
Code No. U0121: ABS-ECU <Vehicles with ABS> or ASC-ECU <Vehicles with ASC> Time-out
CAUTION
If diagnosis code U0121 is set from engine-ECU,
surely perform CAN bus line diagnosis.
CAUTION
Replace ECU after certainly confirming that the
communication circuits are normal.
TROUBLE JUDGMENT
Check Conditions
• More than 2 seconds have passed since the ignition switch was turned to "ON" position.
• Battery positive voltage is more than 10 V and is
less than 16 V.
Judgement Criterion
• Unable to receive ABS-ECU <Vehicles with
ABS> or ASC-ECU <Vehicles with ASC> signals
through the CAN bus line for 4 seconds.
COMMENTS ON TROUBLE SYMPTOM
Current malfunction
• The failure is possibly caused by malfunction of
the harness and connector in CAN bus line
between engine-ECU and ABS-ECU <Vehicles
with ABS> or ASC-ECU <Vehicles with ASC>, by
malfunction in the power supply system of
ABS-ECU <Vehicles with ABS> or ASC-ECU
<Vehicles with ASC>, in ABS-ECU <Vehicles
with ABS> or ASC-ECU <Vehicles with ASC>
itself, in engine-ECU.
Past malfunction
• Proceed with troubleshooting focusing on malfunction of the harness and connector in CAN
bus line between engine-ECU and ABS-ECU
<Vehicles with ABS> or ASC-ECU <Vehicles with
ASC> and malfunction in the power supply system of ABS-ECU <Vehicles with ABS> or
ASC-ECU <Vehicles with ASC>.For diagnosis
procedure, refer to how to cope with past malfunctions. (Refer to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points − How
to Treat Past Trouble ).
NOTE: In the case of past malfunctions, M.U.T.-III
CAN bus line diagnosis cannot detect a malfunction even if there is a malfunction in CAN bus.
Therefore, check CAN bus line as in the case of
response to intermittent malfunctions (Refer to
GROUP 00 − How to Use Troubleshooting/Inspection Service Points − How to Cope with
Intermittent Malfunctions ). It is possible to nar-
row down areas with a high possibility of malfunctions from diagnosis codes set to each ECU that
performs CAN communication (Refer to GROUP
54C − Explanation about the M.U.T.-III CAN Bus
Diagnostics ).
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed harness and connector
• Failed ABS-ECU <Vehicles with ABS> or
ASC-ECU <Vehicles with ASC>
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
• Use M.U.T.-III to perform CAN bus line diagnosis.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair CAN bus line (Refer to GROUP 54C
− Troubleshooting − CAN Bus Diagnostics
Table ). After repairing CAN bus line, go to
Step 6 .
STEP 2. M.U.T.-III diagnosis code
• Confirm the diagnosis code is set from the
ABS-ECU <Vehicles with ABS> or ASC-ECU
<Vehicles with ASC>.
Q: Is diagnosis code set?
YES : Perform troubleshooting of the anti-lock
brake system (ABS) or the active stability
control (ASC) system (Refer to GROUP 35B
− Troubleshooting <Vehicles with ABS>,
Refer to GROUP 35C − Troubleshooting −
Diagnosis Code Chart <Vehicles with
ASC>).
NO : Go to Step 3.
STEP 3. M.U.T.-III diagnosis code
Check that the other ECU performing CAN communication with ABS-ECU <Vehicles with ABS> or
ASC-ECU <Vehicles with ASC> sets diagnosis code
No. U0121 [Refer to GROUP 54C − CAN Communication-related Diagnosis Code (U-code) Table ].
Q: Is diagnosis code set?
YES : Go to Step 4.
NO : Go to Step 5.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
13A-117
STEP 4. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the
engine-ECU.
1. Erase the set diagnosis code.
2. Ignition switch: "LOCK" (OFF) → "ON"
3. Confirm whether the diagnosis code is set.
STEP 5. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the
engine-ECU.
1. Erase the set diagnosis code.
2. Ignition switch: "LOCK" (OFF) → "ON"
3. Confirm whether the diagnosis code is set.
Q: Is diagnosis code set?
YES : After replacing ABS-ECU <Vehicles with
Q: Is diagnosis code set?
YES : After replacing engine-ECU, go to Step 6.
NO : Intermittent malfunction in CAN bus line
ABS> or ASC-ECU <Vehicles with ASC>,
go to Step 6.
NO : Intermittent malfunction in CAN bus line
between engine-ECU and ABS-ECU
<Vehicles with ABS> or ASC-ECU
<Vehicles with ASC> (Refer to GROUP 00 −
How to Use Troubleshooting/Inspection
Service Points − How to Cope with
Intermittent Malfunctions ).
between engine-ECU and ABS-ECU
<Vehicles with ABS> or ASC-ECU
<Vehicles with ASC> (Refer to GROUP 00 −
How to Use Troubleshooting/Inspection
Service Points − How to Cope with
Intermittent Malfunctions ).
STEP 6. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the
engine-ECU.
1. Erase the set diagnosis code.
2. Ignition switch: "LOCK" (OFF) → "ON"
3. Confirm whether the diagnosis code is set.
Q: Is diagnosis code set?
YES : Go to Step 1.
NO : Check end.
Code No. U0131: EPS-ECU Time-out
CAUTION
If diagnosis code U0131 is set from engine-ECU,
surely perform CAN bus line diagnosis.
CAUTION
Replace ECU after certainly confirming that the
communication circuits are normal.
TROUBLE JUDGMENT
Check Condition
• More than 2 seconds have passed since the ignition switch was turned to "ON" position.
• Battery positive voltage is more than 10 V.
Judgement Criterion
• Unable to receive EPS-ECU signals through the
CAN bus line for 4 seconds.
COMMENTS ON TROUBLE SYMPTOM
Current malfunction
• The failure is possibly caused by malfunction of
the harness and connector in CAN bus line
between engine-ECU and EPS-ECU, by malfunction in the power supply system of EPS-ECU, in
EPS-ECU itself, in engine-ECU.
Past malfunction
• Proceed with troubleshooting focusing on malfunction of the harness and connector in CAN
bus line between engine-ECU and EPS-ECU and
malfunction in the power supply system of
EPS-ECU. For diagnosis procedure, refer to how
to cope with past malfunctions. (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points − How to Treat Past Trouble ).
13A-118
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
NOTE: In the case of past malfunctions, M.U.T.-III
CAN bus line diagnosis cannot detect a malfunction even if there is a malfunction in CAN bus.
Therefore, check CAN bus line as in the case of
response to intermittent malfunctions (Refer to
GROUP 00 − How to Use Troubleshooting/Inspection Service Points − How to Cope with
Intermittent Malfunctions ). It is possible to narrow down areas with a high possibility of malfunctions from diagnosis codes set to each ECU that
performs CAN communication (Refer to GROUP
54C − Explanation about the M.U.T.-III CAN Bus
Diagnostics ).
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed harness and connector
• Failed EPS-ECU
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
• Use M.U.T.-III to perform CAN bus line diagnosis.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair CAN bus line (Refer to GROUP 54C
− Troubleshooting − CAN Bus Diagnostics
Table ). After repairing CAN bus line, go to
Step 6.
STEP 2. M.U.T.-III diagnosis code
• Confirm the diagnosis code is set from the
EPS-ECU.
Q: Is diagnosis code set?
YES : Perform troubleshooting of EPS (Refer to
GROUP 37 − Diagnosis Code Chart ).
NO : Go to Step 3.
STEP 3. M.U.T.-III diagnosis code
Check that the other ECU performing CAN communication with EPS-ECU sets diagnosis code No.
U0131 [Refer to GROUP 54C − CAN Communication-related Diagnosis Code (U-code) Table ].
Q: Is diagnosis code set?
YES : Go to Step 4.
NO : Go to Step 5.
STEP 4. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the
engine-ECU.
1. Erase the set diagnosis code.
2. Ignition switch: "LOCK" (OFF) → "ON"
3. Confirm whether the diagnosis code is set.
Q: Is diagnosis code set?
YES : After replacing EPS-ECU, go to Step 6.
NO : Intermittent malfunction in CAN bus line
between engine-ECU and EPS-ECU (Refer
to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 5. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the
engine-ECU.
1. Erase the set diagnosis code.
2. Ignition switch: "LOCK" (OFF) → "ON"
3. Confirm whether the diagnosis code is set.
Q: Is diagnosis code set?
YES : Replace engine-ECU, go to Step 6.
NO : Intermittent malfunction in CAN bus line
between engine-ECU and EPS-ECU (Refer
to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 6. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the
engine-ECU.
1. Erase the set diagnosis code.
2. Ignition switch: "LOCK" (OFF) → "ON"
3. Confirm whether the diagnosis code is set.
Q: Is diagnosis code set?
YES : Go to Step 1.
NO : Check end.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
13A-119
Code No. U0141: ETACS-ECU Time-out
CAUTION
• If diagnosis code U0141 is set from
engine-ECU, surely perform CAN bus line
diagnosis.
• Replace ECU after certainly confirming that
the communication circuits are normal.
• When the ETACS-ECU of vehicles without
KOS is replaced, the encrypted code of the
ignition key needs to be registered to the
ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in
GROUP 54A, Immobilizer System − How to
Register Key ID .)
TROUBLE JUDGMENT
Check Conditions
• More than 2 seconds have passed since the ignition switch was turned to "ON" position.
• Battery positive voltage is more than 10 V and is
less than 16 V.
Judgement Criterion
• Unable to receive ETACS-ECU signals through
the CAN bus line for 4 seconds.
COMMENTS ON TROUBLE SYMPTOM
Current malfunction
• The failure is possibly caused by malfunction of
the harness and connector in CAN bus line
between engine-ECU and ETACS-ECU, by malfunction in the power supply system of
ETACS-ECU, in ETACS-ECU itself, in
engine-ECU.
Past malfunction
• Proceed with troubleshooting focusing on malfunction of the harness and connector in CAN
bus line between engine-ECU and ETACS-ECU
and malfunction in the power supply system of
ETACS-ECU. For diagnosis procedure, refer to
how to cope with past malfunctions. (Refer to
GROUP 00 − How to Use Troubleshooting/Inspection Service Points − How to Treat Past
Trouble ).
NOTE: In the case of past malfunctions, M.U.T.-III
CAN bus line diagnosis cannot detect a malfunction even if there is a malfunction in CAN bus.
Therefore, check CAN bus line as in the case of
response to intermittent malfunctions (Refer to
GROUP 00 − How to Use Troubleshooting/Inspection Service Points − How to Cope with
Intermittent Malfunctions ). It is possible to narrow down areas with a high possibility of malfunctions from diagnosis codes set to each ECU that
performs CAN communication (Refer to GROUP
54C − Explanation about the M.U.T.-III CAN Bus
Diagnostics ).
FAIL-SAFE AND BACKUP FUNCTION
• None
PROBABLE CAUSES
• Failed harness and connector
• Failed ETACS-ECU
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
• Use M.U.T.-III to perform CAN bus line diagnosis.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair CAN bus line (Refer to GROUP 54C
− Troubleshooting − CAN Bus Diagnostics
Table ). After repairing CAN bus line, go to
Step 6.
STEP 2. M.U.T.-III diagnosis code
• Confirm the diagnosis code is set from
ETACS-ECU.
Q: Is diagnosis code set?
YES : Perform troubleshooting of ETACS (Refer to
GROUP 54A − ETACS − Diagnosis Code
Chart ).
NO : Go to Step 3.
STEP 3. M.U.T.-III diagnosis code
Check that the other ECU performing CAN communication with ETACS-ECU sets diagnosis code No.
U0141 [Refer to GROUP 54C − CAN Communication-related Diagnosis Code (U-code) Table ].
Q: Is diagnosis code set?
YES : Go to Step 4.
NO : Go to Step 5.
13A-120
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 4. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the
engine-ECU.
1. Erase the set diagnosis code.
2. Ignition switch: "LOCK" (OFF) → "ON"
3. Confirm whether the diagnosis code is set.
Q: Is diagnosis code set?
YES : After replacing the ETACS-ECU, go to Step
6.
NO : Intermittent malfunction in CAN bus line
between engine-ECU and ETACS-ECU
(Refer to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 5. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the
engine-ECU.
1. Erase the set diagnosis code.
2. Ignition switch: "LOCK" (OFF) → "ON"
3. Confirm whether the diagnosis code is set.
YES : After replacing the engine-ECU, go to Step
6.
NO : Intermittent malfunction in CAN bus line
between engine-ECU and ETACS-ECU
(Refer to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 6. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the
engine-ECU.
1. Erase the set diagnosis code.
2. Ignition switch: "LOCK" (OFF) → "ON"
3. Confirm whether the diagnosis code is set.
Q: Is diagnosis code set?
YES : Go to Step 1.
NO : Check end.
Q: Is diagnosis code set?
Code No. U0167: KOS-ECU Communication Error <Vehicles with KOS>
CAUTION
If diagnosis code U0167 is set from engine-ECU,
surely perform CAN bus line diagnosis.
CAUTION
Replace ECU after certainly confirming that the
communication circuits are normal.
TROUBLE JUDGMENT
Check Condition
• After the engine is cranked.
• Ignition switch is "ON" position.
Judgement Criterion
• Unable to receive KOS-ECU signals through the
CAN bus line.
COMMENTS ON TROUBLE SYMPTOM
Current malfunction
• The failure is possibly caused by malfunction of
the harness and connector in CAN bus line
between engine-ECU and KOS-ECU, by malfunction in the power supply system of
KOS-ECU, in KOS-ECU itself, in engine-ECU.
Past malfunction
• Proceed with troubleshooting focusing on malfunction of the harness and connector in CAN
bus line between engine-ECU and KOS-ECU and
malfunction in the power supply system of
KOS-ECU. For diagnosis procedure, refer to how
to cope with past malfunctions. (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points − How to Treat Past Trouble ).
NOTE: In the case of past malfunctions, M.U.T.-III
CAN bus line diagnosis cannot detect a malfunction even if there is a malfunction in CAN bus.
Therefore, check CAN bus line as in the case of
response to intermittent malfunctions (Refer to
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
GROUP 00 − How to Use Troubleshooting/Inspection Service Points − How to Cope with
Intermittent Malfunctions ). It is possible to narrow down areas with a high possibility of malfunctions from diagnosis codes set to each ECU that
performs CAN communication (Refer to GROUP
54C − Explanation about the M.U.T.-III CAN Bus
Diagnostics ).
FAIL-SAFE AND BACKUP FUNCTION
• Engine start is prohibited.
PROBABLE CAUSES
• Failed harness and connector
• Failed KOS-ECU
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
• Use M.U.T.-III to perform CAN bus line diagnosis.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP
54C − Troubleshooting − CAN Bus
Diagnostics Table ). After repairing the CAN
bus line, go to Step 4.
STEP 2. M.U.T.-III diagnosis code
• Confirm the diagnosis code is set from the
KOS-ECU.
Q: Is diagnosis code set?
13A-121
YES : Perform troubleshooting of KOS-system
(Refer to GROUP 42B − Troubleshooting −
Diagnosis Code Chart ).
NO : Go to Step 3.
STEP 3. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the
engine-ECU.
1. Erase the set diagnosis code.
2. Ignition switch: "LOCK" (OFF) → "ON"
3. Confirm whether the diagnosis code is set.
Q: Is diagnosis code set?
YES : After replacing engine-ECU, go to Step 4.
NO : Intermittent malfunction in CAN bus line
between engine-ECU and KOS-ECU (Refer
to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 4. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the
engine-ECU.
1. Erase the set diagnosis code.
2. Ignition switch: "LOCK" (OFF) → "ON"
3. Confirm whether the diagnosis code is set.
Q: Is diagnosis code set?
YES : Go to Step 1.
NO : Check end.
Code No. U0415: ASC-ECU CAN Data Abnormality <Vehicles with ASC>
CAUTION
If diagnosis code U0415 is set from engine-ECU,
surely perform CAN bus line diagnosis.
Judgement Criterion
• When the communication error is judged
between the engine-ECU and the ASC-ECU
CAUTION
Replace ECU after certainly confirming that the
communication circuits are normal.
COMMENTS ON TROUBLE SYMPTOM
TROUBLE JUDGMENT
Check Conditions
• More than 5 seconds have passed since the ignition switch was turned to "ON" position.
• During engine running.
Current malfunction
• The failure is possibly caused by malfunction of
the harness and connector in CAN bus line
between engine-ECU and ASC-ECU, by malfunction in ASC-ECU signals, in ASC-ECU itself,
in engine-ECU.
13A-122
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
Past malfunction
• Proceed with troubleshooting focusing on malfunction of the harness and connector in CAN
bus line between engine-ECU and ASC-ECU and
malfunction in ASC-ECU signals. For diagnosis
procedure, refer to how to cope with past malfunctions. (Refer to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points − How
to Treat Past Trouble ).
NOTE: In the case of past malfunctions, M.U.T.-III
CAN bus line diagnosis cannot detect a malfunction even if there is a malfunction in CAN bus.
Therefore, check CAN bus line as in the case of
response to intermittent malfunctions (Refer to
GROUP 00 − How to Use Troubleshooting/Inspection Service Points − How to Cope with
Intermittent Malfunctions ). It is possible to narrow down areas with a high possibility of malfunctions from diagnosis codes set to each ECU that
performs CAN communication (Refer to GROUP
54C − Explanation about the M.U.T.-III CAN Bus
Diagnostics ).
FAIL-SAFE AND BACKUP FUNCTION
• Torque requested by active stability control (ASC)
is ignored.
PROBABLE CAUSES
• Failed harness and connector
• Signal failure input into engine-ECU sent from
ASC-ECU through CAN communication
• Failed ASC-ECU
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
• Use M.U.T.-III to perform CAN bus line diagnosis.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair CAN bus line (Refer to GROUP 54C
− Troubleshooting − CAN Bus Diagnosis
Table ). After repairing CAN bus line, go to
Step 6.
STEP 2. M.U.T.-III diagnosis code
• Confirm the diagnosis code is set from the
ASC-ECU.
Q: Is diagnosis code set?
YES : Perform troubleshooting of the active
stability control (ASC) system (Refer to
GROUP 35C − Troubleshooting − Diagnosis
Code Chart ).
NO : Go to Step 3.
STEP 3. M.U.T.-III diagnosis code
Check that the other ECU performing CAN communication with ASC-ECU sets diagnosis code No.
U0415 [Refer to GROUP 54C − CAN Communication-related Diagnosis Code (U-code) Table ].
Q: Is diagnosis code set?
YES : Go to Step 4.
NO : Go to Step 5.
STEP 4. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the
engine-ECU.
1. Erase the set diagnosis code.
2. Ignition switch: "LOCK" (OFF) → "ON"
3. Confirm whether the diagnosis code is set.
Q: Is diagnosis code set?
YES : After replacing ASC-ECU, go to Step 6.
NO : Intermittent malfunction in CAN bus line
between engine-ECU and ASC-ECU (Refer
to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 5. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the
engine-ECU.
1. Erase the set diagnosis code.
2. Ignition switch: "LOCK" (OFF) → "ON"
3. Confirm whether the diagnosis code is set.
Q: Is diagnosis code set?
YES : After replacing engine-ECU, go to Step 6.
NO : Intermittent malfunction in CAN bus line
between engine-ECU and ASC-ECU (Refer
to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 6. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Confirm again the diagnosis code is set from the
engine-ECU.
1. Erase the set diagnosis code.
2. Ignition switch: "LOCK" (OFF) → "ON"
3. Confirm whether the diagnosis code is set.
13A-123
YES : Go to Step 1.
NO : Check end.
Q: Is diagnosis code set?
INSPECTION CHART FOR TROUBLE SYMPTOMS
M1131151504267
Item
Trouble Symptom
Inspectio
n
Procedur
e No.
Communication
with M.U.T.-III is
impossible
Communication between M.U.T.-III and engine-ECU is not possible.
1
Engine warning
lamp
The engine warning lamp does not illuminate right after the ignition switch
is turned to "ON".
2
The engine warning lamp remains illuminating and never goes out.
3
Starting impossible (starter not
operative)
The starter is not operable.
4
Starting impossible
(Starter operative but no initial
combustion)
The starter is operative and cranks
the engine, but no initial combustion
occurs in the cylinders to start the
engine.
5
Starting impossible (Initial
combustion but no complete
combustion)
Initial combustion occurs, but the
engine stalls soon due to the
incomplete combustion.
6
Engine does not start properly
(Long time to start)
The engine starts, but it takes too
long for cranking.
Unstable idling
(Rough idling, hunting)
The engine speed is not constant and 7
fluctuates during the idling. Usually,
this malfunction can be judged from
the shaking tachometer pointer or
vibrations transmitted to the steering
wheel, shift lever, vehicle body and so
on.
Improper idling speed (Too high or
too low)
The idling speed is not within the
normal range.
Engine stalls during idling
(Die out)
The engine stalls during the idling in
no relation to the vehicle movement.
Starting
Improper idling
Engine stalls
The engine stalls when starting the The engine stalls when the
8
car (pass out)
accelerator pedal is depressed in the
idling speed, or during the operation.
Engine stalls at deceleration
The engine stalls at the deceleration.
MULTIPOINT FUEL INJECTION (MPI)
13A-124
TROUBLESHOOTING
Item
Trouble Symptom
Inspectio
n
Procedur
e No.
Driving
Engine does not revolve up
The engine speed does not increase
even when the accelerator pedal is
depressed.
9
Hesitation, sag
The response of vehicle speed
(engine speed) is delayed when the
accelerator pedal is depressed to
accelerate vehicle speed, or the
vehicle speed (engine speed) is
temporarily dropped during the
acceleration.
This phenomenon is called
"hesitation" and a serious hesitation
is called "sag".
10
Poor acceleration
The engine operates smoothly at a
constant-speed run, but the vehicle
does not accelerate properly as the
throttle valve opening changes. In
addition, vehicle will not run in the
specified maximum speed.
Stumble
The engine speed increase is
delayed when the accelerator pedal is
initially depressed at the starting.
Surge
At a constant-speed or acceleration
the vehicle is subject to repeated
jerking (in terms of the drive speed) in
the driving direction.
The feeling of impact or vibration
when accelerating
The driver feels a sudden impact
when the vehicle is accelerated.
11
The feeling of impact or vibration
when decelerating
The driver feels a sudden impact
when the vehicle is decelerated.
12
Knocking
Sharp sound like a hammer striking
on the cylinder walls during the
driving can be heard and wrongly
affects the driving.
13
Ignition timing deviation
The basic ignition timing is deviated
from the datum value.
14
Stopping
Run on (Dieseling)
The engine continues to run after the 15
ignition switch is in "LOCK " (OFF)
position.
Exhaust gas
Odour, white smoke, black smoke The exhaust has an abnormal odour. 16
The concentration of CO/HC is high Either white or black exhaust gas
during the idling.
comes out. The concentration of
CO/HC is high during the idling.
Charging
performance
Battery run down
The battery is soon rundown.
Or, the charging ability of battery is
small.
17
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
Item
Trouble Symptom
Cooling
performance
Overheating
ECO mode
indicator
In running, the ECO mode indicator shows nothing.
13A-125
Inspectio
n
Procedur
e No.
The temperature of engine cooling
water is extremely high.
18
24
PROBLEM SYMPTOMS TABLE
WARNING
When touching the throttle valve, surely shut off the driving circuits of the throttle valve. In
the event that the throttle valve is operated, a finger might be injured as the result of being
caught by the throttle valve.
CAUTION
During troubleshooting if the ignition switch is turned to ON with the connectors, etc. disconnected,
some diagnosis code may be saved in other system. After the troubleshooting is completed, always
make sure the diagnosis codes of the entire systems. If it is found that some diagnosis codes have
been outputted, erase them.
NOTE: When the racing (2,000 to 5,000 r/min or more) continues on the vehicle stopped with no load during
the specified time or more, the increase in the engine speed might be limited. This comes from the engine
protection and control functions and is not a malfunction.
Inspection Inspection Item
Procedure
No.
Reference
Page
1
The communication between M.U.T.-III and engine-ECU is not possible
P.13A-126
2
The engine warning lamp does not illuminate right after the ignition switch is
turned the ON position
P.13A-127
3
The engine warning lamp remains illuminating and never goes out
P.13A-128
4
Starting impossible (starter not operative)
P.13A-128
5
Starting impossible (starter operative but no initial combustion)
P.13A-132
6
Starting impossible (initial combustion but no complete combustion)
P.13A-133
Improper starting (long time to start)
7
Unstable idling (rough idling, hunting)
P.13A-135
Improper idling speed (too high or too low)
Engine stalls during idling (die out)
8
The engine stalls when starting the car (pass out)
P.13A-137
The engine stalls when decelerating
9
Engine does not revolve up
P.13A-137
10
Hesitation, sag
P.13A-138
Poor acceleration
Stumble
Surge
11
The feeling of impact or vibration when accelerating
P.13A-140
12
The feeling of impact or vibration when decelerating
P.13A-141
MULTIPOINT FUEL INJECTION (MPI)
13A-126
TROUBLESHOOTING
Inspection Inspection Item
Procedure
No.
Reference
Page
13
Knocking
P.13A-141
14
Ignition timing deviation
P.13A-142
15
Run on (dieseling)
P.13A-143
16
Odour, white smoke, black smoke, and high-concentration CO/HC during idling P.13A-143
17
Battery run down
P.13A-145
18
Overheating
P.13A-146
19
Engine-ECU power supply, engine control relay, ignition switch−IG1 system
P.13A-147
20
Fuel pump system
P.13A-149
21
A/C compressor relay system
P.13A-151
22
Ignition circuit system
P.13A-152
23
Engine oil pressure switch system
P.13A-154
24
In running, the ECO mode indicator shows nothing
P.13A-155
SYMPTOM PROCEDURES
Inspection Procedure 1: The Communication Between M.U.T.-III and Engine-ECU is Not Possible
OPERATION
• Battery voltage is applied to the diagnosis connector terminal.
• The diagnosis connector terminal is earthed to
the vehicle body.
COMMENTS ON TROUBLE SYMPTOM
• When the communication between M.U.T.-III and
the engine-ECU is impossible, the CAN bus line,
power supply circuit of the diagnosis connector,
and/or earthing circuit could possibly be defective. The communication cannot be achieved
either if the wrong vehicle type is selected on
M.U.T.-III.
PROBABLE CAUSES
• Defective diagnosis connector.
• Open/short circuit or harness damage in diagnosis connector circuit or loose connector contact.
• Defective CAN communication.
• Defective M.U.T.-III.
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check the Vehicle Communication
Interface (V.C.I.) operations
• Connect the M.U.T.-III to the diagnosis connector.
• When the power of Vehicle Communication Interface (V.C.I.) is turned to ON, the indicator lamp of
the Vehicle Communication Interface (V.C.I.) illuminates in green.
OK: The indicator lamp of the Vehicle Communication Interface (V.C.I.) illuminates in
green.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Go to Step 2.
STEP 2. Check battery.
• Check battery (Refer to GROUP 54A − Battery −
On-vehicle Service − Battery Test ).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Replace the battery.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 3. Perform voltage measurement at
diagnosis connector.
• Voltage between terminal power supply line and
body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 6.
NO : Go to Step 4.
STEP 4. Check harness between ETACS-ECU
connector terminal MUT and diagnosis
connector terminal.
• Check power supply line for open/short circuit.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 5. Check harness between battery and
ETACS-ECU terminal +B1 connector.
• Check power supply line for open/short circuit.
Q: Is the check result normal?
YES : Check fuse in the ETACS-ECU, and replace
if necessary. If the fuse is normal, replace
the ETACS-ECU.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 6. Perform resistance measurement at
diagnosis connector.
• Resistance between terminals earth lines and
body earth.
OK: Continuity (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 7.
NO : Check intermediate connector, and repair if
necessary. If intermediate connector is
normal, check and repair the harness
between the diagnosis connector terminals
earth lines and body earth.
• Check earthing line for open circuit
and damage.
13A-127
STEP 7. Continuity check on ETACS-ECU
connectors
• Disconnect connectors, and measure at
ETACS-ECU side.
• Continuity check between terminal +B1 and IG1.
OK: Continuity
Q: Is the check result normal?
YES : Go to Step 8.
NO : Repair or replace the connector, or check
fuse in the ETACS-ECU, and replace if
necessary. If the fuse is normal, replace the
ETACS-ECU.
STEP 8. Check harness between battery and
ETACS-ECU connector terminal +B1.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 9.
NO : Repair the damaged harness wire.
STEP 9. Check harness between ETACS-ECU
connector MUT and diagnosis connector
terminal.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Refer to the M.U.T.-III reference manual.
NO : Repair the damaged harness wire.
STEP 10. M.U.T.-III CAN bus diagnosis
• Use M.U.T.-III, perform CAN bus line diagnosis.
Q: Is the check result normal?
YES : Check Inspection Procedure − engine-ECU
power supply, engine control relay, ignition
switch-IG1 system (Refer to P.13A-147).
NO : Perform troubleshooting for CAN (Refer to
GROUP 54C − Troubleshooting − CAN Bus
Diagnostics Table ).
Inspection Procedure 2: The Engine Warning Lamp Does Not Illuminate Right after the Ignition Switch
is Turned to the "ON" Position
COMMENTS ON TROUBLE SYMPTOM
• The combination meter illuminates the engine
warning lamp just after the ignition switch is in the
"ON" position.
13A-128
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
• If the engine warning lamp is not illuminated just
after the ignition switch is in the "ON" position, the
failure could possibly be caused by the defective
engine warning lamp, open/short circuit of the
combination meter and so on.
PROBABLE CAUSE
• Failed combination meter
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 2. Check the trouble symptom.
Q: Does the trouble symptom persist?
YES : Check combination meter system (Refer to
GROUP 54A − Combination Meter −
Trouble Symptom Chart ).
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is diagnosis code set?
Inspection Procedure 3: The Engine Warning Lamp Remains Illuminating and Never Goes Out
YES : Inspection chart for diagnosis code (Refer
COMMENTS ON TROUBLE SYMPTOM
to P.13A-23).
• The engine-ECU detects failures, or the failures
could possibly be caused by the short circuit of
the combination meter and so on.
PROBABLE CAUSE
• Failed combination meter
NO : Go to Step 2.
STEP 2. Check the trouble symptom.
Q: Does the trouble symptom persist?
YES : Check combination meter system (Refer to
GROUP 54A − Combination Meter −
Trouble System Chart ).
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is diagnosis code set?
Inspection Procedure 4: Starting Impossible (starter not operative)
OPERATION
• The power source is supplied from the battery to
the starter connector terminal.
• The battery voltage is applied to the starter relay
connector terminal.
• When the ignition switch-ST signal is input to the
engine-ECU connector terminal STOE, the
engine-ECU connector terminal STRL turns ON
the power transistor inside the unit, and makes
the current flow into the starter relay connector
terminal to turn ON the relay.
• When the starter relay is turned ON, the current
flows into the starter connector terminal from the
starter relay connector terminal to drive the
starter motor.
COMMENTS ON TROUBLE SYMPTOM
• The failure could possibly be caused by the malfunction of the starter or starter system circuits.
PROBABLE CAUSES
•
•
•
•
•
•
Failed battery
Failed ignition switch <Vehicles without KOS>
Failed OSS-ECU <Vehicles with KOS>
Failed starter relay
Failed starter motor
Open/short circuit or harness damage in starter
system circuit or loose connector contact.
• Failed inhibitor switch
• Failed ETACS-ECU
• Failed engine-ECU
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
DIAGNOSIS PROCEDURE
STEP 1. Check battery.
• Check battery (Refer to GROUP 54A − Battery −
On-vehicle Service − Battery Test ).
Q: Is the check result normal?
YES : Go to Step 2.
NO : Replace the battery.
STEP 2. M.U.T.-III data list
• Item 79: Cranking signal
OK:
ON (ignition switch: "ST")
OFF (ignition switch: "ON")
Q: Is the check result normal?
YES : Go to Step 15.
NO : Go to Step 3.
STEP 3. Connector check: engine-ECU
connector
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector.
STEP 4. Perform voltage measurement at
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ST"
• Voltage between terminal STOE and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 10 <Vehicles without KOS>.
YES : Go to Step 11 <Vehicles with KOS>.
NO : Go to Step 5.
STEP 5. Connector check: ETACS-ECU
connectors
Q: Are the check results normal?
YES : Go to Step 6.
NO : Repair or replace the connector.
13A-129
STEP 6. Perform voltage measurement at
ETACS-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ST"
• Voltage between terminal STOE and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 9.
NO : Go to Step 7 <Vehicles without KOS>.
NO : Go to Step 8 <Vehicles with KOS>.
STEP 7. Check ignition switch itself.
• Ignition switch connector check.
• Check ignition switch itself (Refer to GROUP 54A
− Ignition Switch − Inspection − Ignition Switch
Check ).
Q: Is the check result normal?
YES : Repair or replace the connector, or check
and repair the harness between ignition
switch connector terminal and ETACS-ECU
connector terminal ST.
• Check power supply line for
open/short circuit.
NO : Replace the ignition switch.
STEP 8. Check harness between OSS-ECU
connector terminal STO and ETACS-ECU
connector terminal ST.
• Check power supply line for open/short circuit.
Q: Is the check result normal?
YES : Perform troubleshooting of OSS System
(Refer to GROUP 42B − Troubleshooting −
Trouble Symptom Chart ).
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 9. Continuity check on ETACS-ECU
connectors
• Disconnect connectors, and measure at
ETACS-ECU side.
• Continuity check between terminal ST and
STOE.
OK: Continuity
Q: Is the check result normal?
YES : Check and repair the harness between
ETACS-ECU connector terminal STOE and
engine-ECU connector terminal STOE.
• Check power supply line for
open/short circuit.
NO : Replace the ETACS-ECU.
13A-130
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 10. Check harness between ignition switch
connector terminal and ETACS-ECU connector
terminal ST.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 12.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 15. Check starter relay itself.
• Starter relay connector check.
• Check starter relay itself (Refer to GROUP 16 −
Starting System − On-vehicle Service − Starter
Relay Continuity Check ).
Q: Is the check result normal?
YES : Go to Step 16.
NO : Repair or replace the connector, or replace
the starter relay.
STEP 11. Check harness between OSS-ECU
connector terminal STO and ETACS-ECU
connector terminal ST.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 12.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 12. Continuity check on ETACS-ECU
connectors
• Disconnect connectors, and measure at
ETACS-ECU side.
• Continuity check between terminal ST and
STOE.
OK: Continuity
Q: Is the check result normal?
YES : Go to Step 13.
NO : Replace the ETACS-ECU.
STEP 13. Check harness between ETACS-ECU
connector terminal STOE and engine-ECU
connector terminal STOE.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 14.
NO : Repair the damaged harness wire.
STEP 14. M.U.T.-III data list
• Item 79: Cranking signal
OK:
ON (ignition switch: "ST")
OFF (ignition switch: "ON")
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
STEP 16. Perform resistance measurement at
starter relay connector.
• Remove relay, and measure at relay box side.
• Resistance between terminal earth line and body
earth.
OK: Continuity (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 17.
NO : Check and repair harness between starter
relay connector terminal earth line and body
earth.
• Check earthing line for open circuit
and damage.
STEP 17. Perform voltage measurement at starter
relay connector.
• Remove relay, and measure at relay box side.
• Transmission: P or N range
• Ignition switch: "ST"
• Voltage between inhibitor switch connector terminal, its terminal line and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 23.
NO : Go to Step 18.
STEP 18. Check inhibitor switch
• Inhibitor switch connector check.
• Check inhibitor switch (Refer to GROUP 23A −
On-vehicle Service ).
Q: Is the check result normal?
YES : Go to Step 19.
NO : Repair or replace the connector, or replace
the inhibitor switch.
STEP 19. Check harness between inhibitor
switch connector terminal and starter relay
connector terminal.
• Check power supply line for open/short circuit.
Q: Is the check result normal?
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Go to Step 20.
NO : Repair the damaged harness wire.
STEP 20. Check harness between engine-ECU
connector terminal STRL and inhibitor switch
connector terminal.
• Check power supply line for open/short circuit.
Q: Is the check result normal?
YES : Go to Step 21.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 21. Check harness between engine-ECU
connector terminal NTSW and starter relay
connector terminal.
• Check output line for open/short circuit.
Q: Is the check result normal?
YES : Go to Step 22.
NO : Repair or replace the connector, or repair
the damaged harness wire.
13A-131
STEP 24. Perform voltage measurement at starter
connector.
• Disconnect connector, and measure at harness
side.
• Transmission: P or N range
• Ignition switch: "ST"
• Voltage between terminal power supply line and
body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 29.
NO : Go to Step 25.
STEP 25. Check harness between starter relay
connector terminal and starter connector
terminal.
• Check output line for open/short circuit.
Q: Is the check result normal?
YES : Go to Step 26.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 22. M.U.T.-III data list
• Item 102: Starter relay
OK:
ON (ignition switch: "ST")
OFF (ignition switch: "ON")
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
STEP 23. Perform voltage measurement at starter
relay connector.
• Remove relay, and measure at relay box side.
• Voltage between terminal power supply line and
body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 24.
NO : Check and repair harness between battery
and starter relay connector terminal.
• Check power supply line for
open/short circuit.
STEP 26. Check inhibitor switch
• Check inhibitor switch (Refer to GROUP 23A −
On-vehicle Service ).
Q: Is the check result normal?
YES : Go to Step 27.
NO : Repair or replace the connector, or replace
the inhibitor switch.
STEP 27. Check harness between inhibitor
switch connector terminal and starter relay
connector terminal.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 28.
NO : Repair the damaged harness wire.
STEP 28. Connector check: engine-ECU
connector
Q: Is the check result normal?
YES : Check intermediate connector, and repair if
necessary. If intermediate connector is
normal, check and repair harness between
engine-ECU connector terminal STRL and
inhibitor switch connector terminal.
• Check power supply line for damage.
NO : Repair or replace the connector.
13A-132
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 29. Check harness between battery and
starter relay connector terminal.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 30.
NO : Repair the damaged harness wire.
STEP 30. Check harness between starter relay
connector terminal and starter connector
terminal.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 31.
NO : Repair the damaged harness wire.
STEP 31. Perform voltage measurement at starter
terminal.
• Disconnect terminal, and measure at harness
side.
• Voltage between terminal power supply line and
body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 32.
NO : Repair or replace the terminal, or check and
repair harness between battery and starter
terminal.
• Check power supply line for
open/short circuit.
STEP 32. Check harness between battery and
starter terminal.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Replace the starter.
NO : Repair the damaged harness wire.
Inspection Procedure 5: Starting Impossible (starter operative but no initial combustion)
COMMENTS ON TROUBLE SYMPTOM
• The failure could possibly be caused by the failed
ignition circuit, defective fuel feed and so on.
PROBABLE CAUSES
•
•
•
•
•
•
Failed battery
Timing chain broken
Contamination around the throttle valve
Failed ignition system
Failed fuel system
Failed engine-ECU
DIAGNOSIS PROCEDURE
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 3.
STEP 3. M.U.T.-III actuator test
• Item 9: Fuel pump
OK: Operating sound of fuel pump can be
heard
Q: Is the check result normal?
YES : Go to Step 4.
NO : Check Inspection Procedure − fuel pump
system (Refer to P.13A-149).
STEP 1. Check battery.
• Check battery (Refer to GROUP 54A − Battery −
On-vehicle Service − Battery Test ).
STEP 4. Check timing chain for breakage.
• Engine: Cranking
OK: Camshaft rotates
Q: Is the check result normal?
YES : Go to Step 2.
NO : Replace the battery.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Replace the timing chain.
STEP 2. M.U.T.-III diagnosis code
STEP 5. Check throttle body (throttle valve
portion) contamination.
Q: Is diagnosis code set?
Q: Is the check result normal?
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Go to Step 6.
NO : Throttle body (throttle valve area) cleaning
(Refer to P.13A-179).
STEP 6. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 2: Crank angle sensor
Q: Is the check result normal?
YES : Go to Step 7.
NO : Check code No. P0335: crank angle sensor
system (Refer to P.13A-78).
STEP 7. Visual check of ignition spark.
• Remove the spark plug and install it to the ignition
coil.
• Connect the ignition coil connector.
• Disconnect all injector connectors.
• At the engine start, check each spark plug produces a spark.
Q: Is the check result normal?
YES : Go to Step 9.
NO : Go to Step 8.
13A-133
STEP 9. Check injector for operating sound.
• Injector check (Refer to P.13A-188).
Q: Is operating sound audible?
YES : Go to Step 10.
NO : Check the injector system of the defective
cylinder. Check code No. P0261: No. 1
injector circuit low input (Refer to P.13A-62).
Check code No. P0262: No. 1 injector circuit
high input (Refer to P.13A-63). Check code
No. P0264: No. 2 injector circuit low input
(Refer to P.13A-64). Check code No.
P0265: No. 2 injector circuit high input
(Refer to P.13A-65). Check code No.
P0267: No. 3 injector circuit low input (Refer
to P.13A-66). Check code No. P0268: No. 3
injector circuit high input (Refer to
P.13A-67). Check code No. P0270: No. 4
injector circuit low input (Refer to P.13A-68).
Check code No. P0271: No. 4 injector circuit
high input (Refer to P.13A-69).
STEP 10. Fuel pressure measurement.
• Fuel pressure test (Refer to P.13A-179).
STEP 8. Check spark plug.
• Check spark plug (Refer to GROUP 16 − Ignition
System − On-vehicle Service − Spark Plug Check
and Cleaning ).
Q: Is the check result normal?
YES : Go to Step 11.
NO : Repair.
Q: Is the check result normal?
YES : Check Inspection Procedure − ignition
STEP 11. Replace the engine-ECU.
• After replacing the engine-ECU re-check the trouble symptoms.
circuit system (Refer to P.13A-152).
NO : Replace the spark plug.
Q: Does the trouble symptom persist?
YES : Check for foreign matters (water, diesel fuel,
etc.) in fuel and replace if necessary.
NO : Check end.
Inspection Procedure 6: Starting Impossible (initial combustion but no complete combustion),
Improper Starting (long time to start)
COMMENTS ON TROUBLE SYMPTOM
• The failure could possibly be caused by the poor
ignition, improper air-fuel ratio at cranking, failed
fuel pressure and so on.
• Timing chain in out of place
• Improper compression pressure
• Failed engine-ECU
DIAGNOSIS PROCEDURE
PROBABLE CAUSES
•
•
•
•
•
•
Failed battery
Failed ignition system
Failed fuel system
Failed air-fuel ratio control system
Failed intake air system
Contamination around the throttle valve
STEP 1. Check battery.
• Check battery (Refer to GROUP 54A − Battery −
On-vehicle Service − Battery Test ).
Q: Is the check result normal?
YES : Go to Step 2.
NO : Replace the battery.
13A-134
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 2. M.U.T.-III diagnosis code
Q: Is diagnosis code set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 3.
STEP 3. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 5: Intake air temperature sensor
b. Item 6: Engine coolant temperature sensor
c. Item 8: Manifold absolute pressure sensor
d. Item 10: Air flow sensor
e. Item BB: Barometric pressure sensor
Q: Are the check results normal?
YES : Go to Step 4.
NO : Perform the diagnosis code classified check
procedure for the sensor that has shown an
abnormal data value. Inspection chart for
diagnosis code (Refer to P.13A-23).
STEP 4. Check throttle body (throttle valve
portion) contamination.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Throttle body (throttle valve area) cleaning
(Refer to P.13A-179).
STEP 5. M.U.T.-III actuator test
• Item 9: Fuel pump
OK: Operating sound of fuel pump can be
heard.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Check Inspection Procedure − fuel pump
system (Refer to P.13A-149).
YES : Go to Step 8.
NO : Check the injector system of the defective
cylinder. Check code No. P0261: No. 1
injector circuit low input (Refer to P.13A-62).
Check code No. P0262: No. 1 injector circuit
high input (Refer to P.13A-63). Check code
No. P0264: No. 2 injector circuit low input
(Refer to P.13A-64). Check code No.
P0265: No. 2 injector circuit high input
(Refer to P.13A-65). Check code No.
P0267: No. 3 injector circuit low input (Refer
to P.13A-66). Check code No. P0268: No. 3
injector circuit high input (Refer to
P.13A-67). Check code No. P0270: No. 4
injector circuit low input (Refer to P.13A-68).
Check code No. P0271: No. 4 injector circuit
high input (Refer to P.13A-69).
STEP 8. Check timing mark on the timing chain.
Q: Is the check result normal?
YES : Go to Step 9.
NO : Align the timing marks.
STEP 9. Visual check of ignition spark.
• Remove the spark plug and install it to the ignition
coil.
• Connect the ignition coil connector.
• Disconnect all injector connectors.
• At the engine start, check each spark plug produces a spark.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Check Inspection Procedure − ignition
circuit system (Refer to P.13A-152).
STEP 10. Check injector for spray condition.
• Injector check (Refer to P.13A-188).
STEP 6. Check air intake from inlet hose and inlet
manifold.
Q: Is the check result normal?
YES : Go to Step 11.
NO : Replace the injector.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair.
STEP 11. Fuel pressure measurement.
• Fuel pressure test (Refer to P.13A-179).
STEP 7. Check injector for operating sound.
• Injector check (Refer to P.13A-188).
Q: Is the check result normal?
YES : Go to Step 12.
NO : Repair.
Q: Is operating sound audible?
STEP 12. Check compression pressure.
• Check the compression pressure (Refer to
GROUP 11A − On-vehicle Service − Compres-
sion Pressure Check ).
Q: Is the check result normal?
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Go to Step 13.
NO : Repair.
13A-135
YES : Check for foreign matters (water, diesel fuel,
etc.) in fuel and replace if necessary.
NO : Check end.
STEP 13. Replace the engine-ECU.
• After replacing the engine-ECU re-check the trouble symptoms.
Q: Does the trouble symptom persist?
Inspection Procedure 7: Unstable Idling (rough idling, hunting), Improper Idling Speed (too high or
too low), Engine Stalls during Idling (die out)
COMMENTS ON TROUBLE SYMPTOM
• Probable causes can be widely found in the ignition system, air-fuel ratio control system, electronic-controlled throttle valve system, fuel
system and so on. A sudden engine stall could
possibly be caused by the poor contact at the
connectors.
PROBABLE CAUSES
•
•
•
•
•
•
•
•
•
Failed ignition system
Failed fuel system
Failed air-fuel ratio control system
Failed intake air system
Contamination around the throttle valve
Timing chain in out of place
Improper compression pressure
Failed variable valve timing control system
Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 2. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 5: Intake air temperature sensor
b. Item 6: Engine coolant temperature sensor
c. Item 8: Manifold absolute pressure sensor
d. Item 10: Air flow sensor
e. Item 11: Accelerator pedal position sensor
(main)
f. Item 12: Accelerator pedal position sensor
(sub)
g. Item 13: Throttle position sensor (main)
h. Item 15: Throttle position sensor (sub)
i. Item 36: V.V.T.phase angle (inlet)
j. Item BB: Barometric pressure sensor
Q: Are the check results normal?
YES : Go to Step 3.
NO : Perform the diagnosis code classified check
procedure for the sensor that has shown an
abnormal data value. Inspection chart for
diagnosis code (Refer to P.13A-23).
STEP 1. M.U.T.-III diagnosis code
Q: Is diagnosis code set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 3. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 87: Neutral switch
Q: Is the check result normal?
YES : Go to Step 4.
NO : Carry out checks relating to the system.
STEP 4. Check air intake from inlet hose and inlet
manifold.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair.
STEP 5. Check timing mark on the timing chain.
YES : Go to Step 6.
Q: Is the check result normal?
NO : Align the timing marks.
13A-136
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 6. Check throttle body (throttle valve
portion) contamination.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Throttle body (throttle valve area) cleaning
YES : Replace the alternator.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
(Refer to P.13A-179).
STEP 7. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item AC: Oxygen sensor (front)
b. Item AD: Oxygen sensor (rear)
Q: Are the check results normal?
YES : Go to Step 8.
NO : Perform the diagnosis code classified check
procedure for the sensor that has shown an
abnormal data value. Inspection chart for
diagnosis code (Refer to P.13A-23).
STEP 8. Perform voltage measurement at
engine-ECU connector.
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspection.
• Engine: Idle operation after warm-up
• Transmission: P range
• Radiator fan: Not operated
• Voltage between terminal ALTG and body earth.
OK: The voltage increases when the headlamp switch and the rear window defogger
switch are turned ON from OFF.
Q: Is the check result normal?
YES : Go to Step 11.
NO : Go to Step 9.
STEP 9. Check harness between engine-ECU
connector terminal ALTG and alternator
connector terminal.
• Check output line for open/short circuit and damage.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 10. Check the trouble symptom.
Q: Does the trouble symptom persist?
STEP 11. Visual check of ignition spark.
• Remove the spark plug and install it to the ignition
coil.
• Connect the ignition coil connector.
• Disconnect all injector connectors.
• At the engine start, check each spark plug produces a spark.
Q: Is the check result normal?
YES : Go to Step 12.
NO : Check Inspection Procedure − ignition
circuit system (Refer to P.13A-152).
STEP 12. Check purge control solenoid valve
itself.
• Check purge control solenoid valve itself (Refer
to GROUP 17 − Emission Control − Evaporative
Emission Control System − Purge Control Solenoid Valve Check ).
Q: Is the check result normal?
YES : Go to Step 13.
NO : Replace the purge control solenoid valve.
STEP 13. Check injector for spray condition.
• Injector check (Refer to P.13A-188).
Q: Is the check result normal?
YES : Go to Step 14.
NO : Replace the injector.
STEP 14. Check compression pressure.
• Check the compression pressure (Refer to
GROUP 11A − On-vehicle Service − Compression Pressure Check ).
Q: Is the check result normal?
YES : Go to Step 15.
NO : Repair.
STEP 15. Replace the engine-ECU.
• After replacing the engine-ECU re-check the trouble symptoms.
Q: Does the trouble symptom persist?
YES : Check for foreign matters (water, diesel fuel,
etc.) in fuel and replace if necessary.
NO : Check end.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
13A-137
Inspection Procedure 8: The Engine Stalls when Starting the Car (pass out), The Engine Stalls when
Decelerating
YES : Go to Step 3.
NO : Perform the diagnosis code classified check
COMMENTS ON TROUBLE SYMPTOM
• The failure could possibly be caused by the misfire due to the failed spark plug, improper air-fuel
ratio at the accelerator pedal depression and so
on when the engine stalls at the acceleration.
• The failure could possibly be caused by the
improper air-fuel ratio due to the insufficient
amount of intake air and so on when the engine
stalls at the deceleration.
PROBABLE CAUSES
•
•
•
•
•
Failed ignition system
Failed intake air system
Contamination around the throttle valve
Improper compression pressure
Failed engine-ECU
DIAGNOSIS PROCEDURE
procedure for the sensor that has shown an
abnormal data value. Inspection chart for
diagnosis code (Refer to P.13A-23).
STEP 3. Check air inlet from inlet hose and inlet
manifold.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair.
STEP 4. Check throttle body (throttle valve
portion) contamination.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Throttle body (throttle valve area) cleaning
(Refer to P.13A-179).
STEP 1. M.U.T.-III diagnosis code
Q: Is diagnosis code set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 2. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 11: Accelerator pedal position sensor
(main)
b. Item 12: Accelerator pedal position sensor
(sub)
c. Item 13: Throttle position sensor (main)
d. Item 15: Throttle position sensor (sub)
Q: Are the check results normal?
STEP 5. Visual check of ignition spark.
• Remove the spark plug and install it to the ignition
coil.
• Connect the ignition coil connector.
• Disconnect all injector connectors.
• At the engine start, check each spark plug produces a spark.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Check Inspection Procedure − ignition
circuit system (Refer to P.13A-152).
STEP 6. Check compression pressure.
• Check the compression pressure (Refer to
GROUP 11A − On-vehicle Service − Compression Pressure Check ).
Q: Is the check result normal?
YES : Replace the engine-ECU.
NO : Repair.
Inspection Procedure 9: Engine Does Not Revolve Up
COMMENTS ON TROUBLE SYMPTOM
• The failure could possibly be caused by the failed
electronic-controlled throttle valve system, faulty
fuel system, defective ignition system and so on.
PROBABLE CAUSES
•
•
•
•
Failed ignition system
Failed fuel system
Failed electronic-controlled throttle valve system
Timing chain in out of place
13A-138
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
• Failed CVT
• Failed engine-ECU
DIAGNOSIS PROCEDURE
NOTE: To protect the CVT, the CVT-ECU outputs,
into the engine-ECU, the request signal to reduce the
engine torque according to the operation condition.
Based on the signal, the engine-ECU closes the
throttle valve, retards the ignition or carries out fuel
cut. At that time, the engine output seems to temporarily reduce, but there is no malfunction.
STEP 3. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 11: Accelerator pedal position sensor
(main)
b. Item 12: Accelerator pedal position sensor
(sub)
c. Item 13: Throttle position sensor (main)
d. Item 15: Throttle position sensor (sub)
Q: Are the check results normal?
YES : Go to Step 4.
NO : Perform the diagnosis code classified check
procedure for the sensor that has shown an
abnormal data value. Inspection chart for
diagnosis code (Refer to P.13A-23).
STEP 1. M.U.T.-III diagnosis code
Q: Is diagnosis code set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 2. M.U.T.-III diagnosis code
NOTE: When the CVT has a malfunction, the
CVT-ECU might output the request signal of reducing
the engine torque in order to protect the CVT.
• Confirm the diagnosis code is set from CVT-ECU
Q: Is the diagnosis code set?
YES : Perform troubleshooting of CVT System
(Refer to GROUP 23A − Diagnosis Code
Chart ).
NO : Go to Step 3.
STEP 4. Check timing mark on the timing chain.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Align the timing marks.
STEP 5. Visual check of ignition spark.
• Remove the spark plug and install it to the ignition
coil.
• Connect the ignition coil connector.
• Disconnect all injector connectors.
• At the engine start, check each spark plug produces a spark.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Check Inspection Procedure − ignition
circuit system (Refer to P.13A-152).
STEP 6. Fuel pressure measurement.
• Fuel pressure test (Refer to P.13A-179).
Q: Is the check result normal?
YES : Replace the engine-ECU.
NO : Repair.
Inspection Procedure 10: Hesitation, Sag, Poor Acceleration, Stumble or Surge
COMMENTS ON TROUBLE SYMPTOM
• The failure could possibly be caused by the failed
ignition system, improper air-fuel ratio, faulty
compression pressure and so on.
PROBABLE CAUSES
• Failed air-fuel ratio control system
• Failed ignition system
•
•
•
•
•
•
•
Failed fuel system
Failed intake and exhaust air system
Failed electronic-controlled throttle valve system
Contamination around the throttle valve
Improper compression pressure
Failed CVT
Failed engine-ECU
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
DIAGNOSIS PROCEDURE
NOTE: To protect the CVT, the CVT-ECU outputs,
into the engine-ECU, the request signal to reduce the
engine torque according to the operation condition.
Based on the signal, the engine-ECU closes the
throttle valve, retards the ignition or carries out fuel
cut. At that time, the engine output seems to temporarily reduce, but there is no malfunction.
STEP 1. M.U.T.-III diagnosis code
Q: Is diagnosis code set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 2. M.U.T.-III diagnosis code
NOTE: When the CVT has a malfunction, the
CVT-ECU might output the request signal of reducing
the engine torque in order to protect the CVT.
• Confirm the diagnosis code is set from CVT-ECU.
Q: Is the diagnosis code set?
YES : Perform troubleshooting of CVT System
(Refer to GROUP 23A − Diagnosis Code
Chart ).
NO : Go to Step 3.
STEP 3. Check injector for operating sound.
• Injector check (Refer to P.13A-188).
Q: Is operating sound audible?
YES : Go to Step 4.
NO : Check the injector system of the defective
cylinder. Check code No. P0261: No. 1
injector circuit low input (Refer to P.13A-62).
Check code No. P0262: No. 1 injector circuit
high input (Refer to P.13A-63). Check code
No. P0264: No. 2 injector circuit low input
(Refer to P.13A-64). Check code No.
P0265: No. 2 injector circuit high input
(Refer to P.13A-65). Check code No.
P0267: No. 3 injector circuit low input (Refer
to P.13A-66). Check code No. P0268: No. 3
injector circuit high input (Refer to
P.13A-67). Check code No. P0270: No. 4
injector circuit low input (Refer to P.13A-68).
Check code No. P0271: No. 4 injector circuit
high input (Refer to P.13A-69).
13A-139
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 5: Intake air temperature sensor
b. Item 6: Engine coolant temperature sensor
c. Item 11: Accelerator pedal position sensor
(main)
d. Item 12: Accelerator pedal position sensor
(sub)
e. Item 13: Throttle position sensor (main)
f. Item 15: Throttle position sensor (sub)
g. Item BB: Barometric pressure sensor
Q: Are the check results normal?
YES : Go to Step 5.
NO : Perform the diagnosis code classified check
procedure for the sensor that has shown an
abnormal data value. Inspection chart for
diagnosis code (Refer to P.13A-23).
STEP 5. Check purge control solenoid valve
itself.
• Check purge control solenoid valve itself (Refer
to GROUP 17− Emission Control − Evaporative
Emission Control System − Purge Control Solenoid Valve Check ).
Q: Is the check result normal?
YES : Go to Step 6.
NO : Replace the purge control solenoid valve.
STEP 6. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item AC: Oxygen sensor (front)
b. Item AD: Oxygen sensor (rear)
Q: Are the check results normal?
YES : Go to Step 7.
NO : Perform the diagnosis code classified check
procedure for the sensor that has shown an
abnormal data value. Inspection chart for
diagnosis code (Refer to P.13A-23).
STEP 7. Visual check of ignition spark.
• Remove the spark plug and install it to the ignition
coil.
• Connect the ignition coil connector.
• Disconnect all injector connectors.
• At the engine start, check each spark plug produces a spark.
Q: Is the check result normal?
YES : Go to Step 8.
NO : Check Inspection Procedure − ignition
circuit system (Refer to P.13A-152).
13A-140
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 8. Check throttle body (throttle valve
portion) contamination.
STEP 10. Fuel pressure measurement.
• Fuel pressure test (Refer to P.13A-179).
Q: Is the check result normal?
YES : Go to Step 9.
NO : Throttle body (throttle valve area) cleaning
Q: Is the check result normal?
YES : Go to Step 11.
NO : Repair.
(Refer to P.13A-179).
STEP 9. Check compression pressure.
• Check the compression pressure (Refer to
GROUP 11A − On-vehicle Service − Compression Pressure Check ).
Q: Is the check result normal?
YES : Go to Step 10.
NO : Repair.
STEP 11. Check air intake from inlet hose and
inlet manifold.
Q: Is the check result normal?
YES : Go to Step 12.
NO : Repair.
STEP 12. Check exhaust leak from exhaust
manifold.
Q: Is the check result normal?
YES : Replace the engine-ECU.
NO : Repair.
Inspection Procedure 11: The Feeling of Impact or Vibration when Accelerating
COMMENTS ON TROUBLE SYMPTOM
• The failure could possibly be caused by the ignition leak occurring in association with the
increase in the voltage required by the spark plug
during the acceleration, failed electronic-controlled throttle valve system and so on.
PROBABLE CAUSES
•
•
•
•
•
Failed ignition system
Failed electronic-controlled throttle valve system
Contamination around the throttle valve
Failed CVT
Failed engine-ECU
DIAGNOSIS PROCEDURE
NOTE: To protect the CVT, the CVT-ECU outputs,
into the engine-ECU, the request signal to reduce the
engine torque according to the operation condition,
Based on the signal, the engine-ECU closes the
throttle valve, retards the ignition or carries out fuel
cut. At that time, the engine output seems to temporarily reduce, but there is no malfunction.
STEP 1. M.U.T.-III diagnosis code
Q: Is diagnosis code set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 2. M.U.T.-III diagnosis code
NOTE: When the CVT has a malfunction, the
CVT-ECU might output the request signal of reducing
the engine torque in order to protect the CVT.
• Confirm the diagnosis code is set from CVT-ECU.
Q: Is the diagnosis code set?
YES : Perform troubleshooting of CVT System
(Refer to GROUP 23A − Diagnosis Code
Chart ).
NO : Go to Step 3.
STEP 3. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 11: Accelerator pedal position sensor
(main)
b. Item 12: Accelerator pedal position sensor
(sub)
c. Item 13: Throttle position sensor (main)
d. Item 15: Throttle position sensor (sub)
Q: Are the check results normal?
YES : Go to Step 4.
NO : Perform the diagnosis code classified check
procedure for the sensor that has shown an
abnormal data value. Inspection chart for
diagnosis code (Refer to P.13A-23).
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 4. Check throttle body (throttle valve
portion) contamination.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Throttle body (throttle valve area) cleaning
(Refer to P.13A-179).
13A-141
STEP 5. Visual check of ignition spark.
• Remove the spark plug and install it to the ignition
coil.
• Connect the ignition coil connector.
• Disconnect all injector connectors.
• At the engine start, check each spark plug produces a spark.
Q: Is the check result normal?
YES : Replace the engine-ECU.
NO : Check Inspection Procedure − ignition
circuit system (Refer to P.13A-152).
Inspection Procedure 12: The Feeling of Impact or Vibration when Decelerating
COMMENTS ON TROUBLE SYMPTOM
• Failure is possibly caused by an insufficient
amount of intake air due to failed electronic-controlled throttle valve system.
PROBABLE CAUSES
• Failed electronic control throttle valve system
• Contamination around the throttle valve
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is diagnosis code set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 2. M.U.T.-III data list
• Refer to Data List Reference Table P.13A-155.
a. Item 11: Accelerator pedal position sensor
(main)
b. Item 12: Accelerator pedal position sensor
(sub)
c. Item 13: Throttle position sensor (main)
d. Item 15: Throttle position sensor (sub)
Q: Are the check results normal?
YES : Go to Step 3.
NO : Perform the diagnosis code classified check
procedure for the sensor that has shown an
abnormal data value (Refer to Inspection
Chart for Diagnosis Code P.13A-23).
STEP 3. Check throttle body (throttle valve
portion) contamination.
Q: Is the check result normal?
YES : Replace the engine-ECU.
NO : Clean throttle body (throttle valve portion)
(Refer to Throttle Body (Throttle Valve Area)
Cleaning P.13A-179).
Inspection Procedure 13: Knocking
COMMENTS ON TROUBLE SYMPTOM
• The failure could possibly be caused by the failed
detonation control system, improper thermal
value of the spark plug and so on.
• Failed spark plug
• Failed ignition system
• Failed engine-ECU
DIAGNOSIS PROCEDURE
PROBABLE CAUSES
• Failed detonation sensor
• Failed detonation control system
STEP 1. M.U.T.-III diagnosis code
Q: Is diagnosis code set?
13A-142
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 2. Visual check of ignition spark.
• Remove the spark plug and install it to the ignition
coil.
• Connect the ignition coil connector.
• Disconnect all injector connectors.
• At the engine start, check each spark plug produces a spark.
YES : Check detonation sensor system. Check
code No.P0327: detonation sensor circuit
low input (Refer to P.13A-77). Check code
No.P0328: detonation sensor circuit high
Input (Refer to P.13A-78).
NO : Check Inspection Procedure − ignition
circuit system (Refer to P.13A-152).
Q: Is the check result normal?
Inspection Procedure 14: Ignition Timing Deviation
COMMENTS ON TROUBLE SYMPTOM
• The failure could possibly be caused by the failed
crank angle sensor, faulty inlet camshaft position
sensor, improper assembled timing chain and so
on.
PROBABLE CAUSES
•
•
•
•
Failed crank angle sensor
Failed inlet camshaft position sensor
Timing chain in out of place
Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is diagnosis code set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 2. Perform output wave pattern
measurement at crank angle sensor and inlet
camshaft position sensor (Using an
oscilloscope).
<Crank angle sensor>
• Use the test harness (MB991709) to connect
crank angle sensor connector, and measure at
the pick-up harness.
• Engine: Idling
• Transmission: P range
• Voltage between terminal engine-ECU SGT line
and body earth.
<Inlet camshaft position sensor>
• Use the test harness (MB991709) to connect inlet
camshaft position sensor connector, and measure at pick-up harness.
• Engine: Idling
• Transmission: P range
• Voltage between terminal engine-ECU CPI line
and body earth.
OK: The timings on the output wave pattern
at the both sensors should be the same as
the specification in the inspection procedure
using an oscilloscope (Refer to P.13A-174).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Go to Step 4.
STEP 3. Check the trouble symptom.
Q: Does the trouble symptom persist?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
13A-143
STEP 4. Check crank angle sensor and inlet
camshaft position sensor for correct mounting
condition.
STEP 7. Replace the crank angle sensor.
• After replacing the crank angle sensor, re-check
the trouble symptoms.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair.
Q: Does the trouble symptom persist?
YES : Go to Step 8.
NO : Check end.
STEP 5. Check timing mark on the timing chain.
STEP 8. Replace the inlet camshaft position
sensor.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Align the timing marks on timing chain.
Q: Does the trouble symptom persist?
YES : Go to Step 9.
NO : Check end.
STEP 6. Check inlet camshaft sensing portion.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the inlet camshaft.
STEP 9. Replace the crankshaft sensing ring.
• After replacing the crankshaft sensing ring,
re-check the trouble symptoms.
Q: Does the trouble symptom persist?
YES : Replace the engine-ECU.
NO : Check end.
Inspection Procedure 15: Run On (Dieseling)
COMMENTS ON TROUBLE SYMPTOM
• Failure is possibly caused by leakage from injectors.
PROBABLE CAUSES
• Failed injector
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check injector for its spray condition.
• Check each injector for spray condition (Refer to
Injector Check P.13A-188).
Q: Does the trouble symptom persist?
YES : Replace the engine-ECU.
NO : Replace the injector.
Inspection Procedure 16: Odour, White Smoke, Black Smoke and High-concentration of CO/HC
during Idling
COMMENTS ON TROUBLE SYMPTOM
• The failure could possibly be caused by the
improper air-fuel ratio, deteriorated catalyst,
failed ignition system, defective fuel system,
faulty compression pressure and so on.
PROBABLE CAUSES
•
•
•
•
•
•
•
Failed air-fuel ratio control system
Failed ignition system
Failed fuel system
Failed intake and exhaust air system
Improper compression pressure
Deteriorated catalyst
Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is diagnosis code set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 2. Check injector for operating sound.
• Injector check (Refer to P.13A-188).
Q: Is operating sound audible?
13A-144
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Go to Step 3.
NO : Check the injector system of the defective
cylinder. Check code No. P0261: No. 1
injector circuit low input (Refer to P.13A-62).
Check code No. P0262: No. 1 injector circuit
high input (Refer to P.13A-63). Check code
No. P0264: No. 2 injector circuit low input
(Refer to P.13A-64). Check code No.
P0265: No. 2 injector circuit high input
(Refer to P.13A-65). Check code No.
P0267: No. 3 injector circuit low input (Refer
to P.13A-66). Check code No. P0268: No. 3
injector circuit high input (Refer to
P.13A-67). Check code No. P0270: No. 4
injector circuit low input (Refer to P.13A-68).
Check code No. P0271: No. 4 injector circuit
high input (Refer to P.13A-69).
STEP 3. Check ignition timing.
• Check ignition timing (Refer to GROUP 11A −
On-vehicle Service − Ignition Timing Check ).
Q: Is the check result normal?
YES : Go to Step 4.
NO : Check Inspection Procedure − ignition
timing deviation (Refer to P.13A-142).
STEP 4. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 5: Intake air temperature sensor
b. Item 6: Engine coolant temperature sensor
c. Item 8: Manifold absolute pressure sensor
d. Item 10: Air flow sensor
e. Item BB: Barometric pressure sensor
Q: Are the check results normal?
YES : Go to Step 5.
NO : Perform the diagnosis code classified check
procedure for the sensor that has shown an
abnormal data value. Inspection chart for
diagnosis code (Refer to P.13A-23).
STEP 5. Check air intake from inlet hose and inlet
manifold.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair.
STEP 6. Check exhaust leak from exhaust
manifold.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair.
STEP 7. Check throttle body (throttle valve
portion) contamination.
Q: Is the check result normal?
YES : Go to Step 8.
NO : Throttle body (throttle valve area) cleaning
(Refer to P.13A-179).
STEP 8. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item AC: Oxygen sensor (front)
b. Item AD: Oxygen sensor (rear)
Q: Are the check results normal?
YES : Go to Step 9.
NO : Perform the diagnosis code classified check
procedure for the sensor that has shown an
abnormal data value. Inspection chart for
diagnosis code (Refer to P.13A-23).
STEP 9. Check purge control solenoid valve
itself.
• Check purge control solenoid valve itself (Refer
to GROUP 17− Emission Control − Evaporative
Emission Control System − Purge Control Solenoid Valve Check ).
Q: Is the check result normal?
YES : Go to Step 10.
NO : Replace the purge control solenoid valve.
STEP 10. Fuel pressure measurement.
• Fuel pressure test (Refer to P.13A-179).
Q: Is the check result normal?
YES : Go to Step 11.
NO : Repair.
STEP 11. Check positive crankcase ventilation
valve itself.
• Check positive crankcase ventilation valve itself
(Refer to GROUP 17 − Emission Control − Crankcase Emission Control System − Positive Crankcase Ventilation Valve Check ).
Q: Is the check result normal?
YES : Go to Step 12.
NO : Replace the positive crankcase ventilation
valve.
STEP 12. Check spark plug.
• Check spark plug (Refer to GROUP 16 − Ignition
System − On-vehicle service − Spark Plug Check
and Cleaning ).
Q: Is the check result normal?
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Go to Step 13.
NO : Replace the spark plug.
STEP 13. Check compression pressure.
• Check the compression pressure (Refer to
GROUP 11A − On-vehicle Service − Compression Pressure Check ).
Q: Is the check result normal?
YES : Go to Step 14.
NO : Repair.
13A-145
STEP 14. Check injector for spray condition.
• Injector check (Refer to P.13A-188).
Q: Is the check result normal?
YES : Go to Step 15.
NO : Replace the injector.
STEP 15. Replace the catalytic converter.
• After the replacing the catalytic converter,
re-check the trouble symptoms.
Q: Does the trouble symptom persist?
YES : Replace the engine-ECU.
NO : Check end.
Inspection Procedure 17: Battery Run Down
OPERATION
• The exciting currents of the alternator field coil
are input into the engine-ECU connector terminal
ALTL from the alternator connector.
• The electric generating capacity of the alternator
connector terminal is restricted according to the
signal from the engine-ECU connector terminal
ALTG.
COMMENTS ON TROUBLE SYMPTOM
• The failure could possibly be caused by the failed
alternator, defective alternator control system and
so on.
PROBABLE CAUSES
• Failed battery
• Open/short circuit or harness damage in alternator L terminal circuit
• Short circuit in alternator G terminal
• Failed alternator
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check battery.
• Check battery (Refer to GROUP 54A − Battery −
On-vehicle Service − Battery Test ).
Q: Is the check result normal?
YES : Go to Step 2.
NO : Replace the battery.
STEP 5. Check harness between engine-ECU
connector terminal ALTL and alternator
connector terminal.
STEP 2. Perform voltage measurement at
alternator connector
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU ALTL line
and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 3.
STEP 3. Check harness between engine-ECU
connector terminal ALTL and alternator
connector terminal.
• Check power supply line for open/short circuit.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 4. Check the trouble symptom.
Q: Does the trouble symptom persist?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
• Check power supply line for damage.
Q: Is the check result normal?
13A-146
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
YES : Go to Step 6.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 6. Perform voltage measurement at
alternator connector.
• Disconnect connector, and measure at alternator
side.
• Connect special tool Test Harness (MB991658)
to all terminals except the terminal engine-ECU
ALTG line.
• Ignition switch: "ON"
• Voltage between terminal engine-ECU ALTG line
and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the alternator.
STEP 7. Check harness between engine-ECU
connector terminal ALTG and alternator
connector terminal.
• Check output line for short circuit.
YES : Go to Step 8.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 8. Perform voltage measurement at
engine-ECU connector.
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspection.
• Engine: Idle operation after warm-up
• Transmission: P range
• Cooling fan: Not operated
• Voltage between terminal ALTG and body earth.
OK: The voltage increases when the headlamp switch and the rear window defogger
switch are turned "ON" from "OFF".
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 4.
Q: Is the check result normal?
Inspection Procedure 18: Overheating
COMMENTS ON TROUBLE SYMPTOM
• The failure could possibly be caused by the failed
engine cooling system, defective cooling fan system, faulty engine coolant temperature sensor
and so on.
PROBABLE CAUSES
• Insufficient amount or deteriorated quality of
engine coolant
• Failed cooling fan system
• Failed engine coolant temperature sensor
• Failed thermostat
• Failed water pump
• Failed radiator core
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is the diagnosis code set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2.
STEP 2. Check engine coolant.
NOTE: When the engine coolant level is too low,
check for any section that cases leakage and repair,
if necessary.
• Check engine coolant (Refer to GROUP 14 −
On-vehicle Service − Engine Coolant Leak Check
).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Replace or fill the engine coolant.
STEP 3. M.U.T.-III actuator test
• Item 14: Cooling fan motor
OK: Fan motor rotates at high speed.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Check fan control relay system (Refer to
GROUP 14 − Troubleshooting ).
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 4. M.U.T.-III data list
• Item 6: Engine coolant temperature sensor
OK:
Engine cold state: At ambient temperature
(atmospheric temperature) or equivalent.
Engine hot state: At 80 − 120°C
Q: Is the check result normal?
YES : Go to Step 5.
NO : Check engine coolant temperature sensor
system. Check code No. P0117: engine
coolant temperature sensor circuit low input
(Refer to P.13A-41). Check code No.
P0118: engine coolant temperature sensor
circuit high input (Refer to P.13A-42).
13A-147
STEP 5. Check thermostat.
• Check thermostat (Refer to GROUP 14 − Thermostat − Inspection ).
Q: Is the check result normal?
YES : Go to Step 6.
NO : Replace the thermostat.
STEP 6. Check water pump.
• Check water pump (Refer to GROUP 14 −
On-vehicle Service − Water Pump Coolant Leak
Check ).
Q: Is the check result normal?
YES : Replace the radiator.
NO : Replace the water pump.
Inspection Procedure 19: Engine-ECU Power Supply, Engine Control Relay, Ignition Switch-IG1
System
OPERATION
• Battery voltage is applied to the engine control
relay power supply line.
• Engine-ECU connector terminal C/R applies current to the engine control relay coil by turning ON
the power transistor in the unit in order to turn the
relay ON.
• When the engine control relay is turned ON, the
battery power will be supplied from the engine
control relay to the engine-ECU, sensor and actuator.
FUNCTION
• When the ignition switch ON signal is input into
the engine-ECU via ETACS-ECU, the
engine-ECU turns ON the engine control relay.
This causes battery voltage to be supplied to the
engine-ECU, sensor and actuator.
DIAGNOSIS PROCEDURE
STEP 1. Check battery.
• Battery check (Refer to GROUP 54A − Battery −
On-vehicle Service − Battery Test ).
Q: Is the check result normal?
YES : Go to Step 2.
NO : Replace the battery.
STEP 2. Check engine control relay itself.
• Engine control relay connector check.
• Engine control relay continuity check (Refer to
P.13A-184).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or replace
the engine control relay.
PROBABLE CAUSES
•
•
•
•
•
•
•
•
•
Failed battery
Failed engine control relay
Failed ignition switch <Vehicles without KOS>
Failed OSS-ECU <Vehicles with KOS>
Open/short circuit or harness damage in engine
control relay circuit, or loose connector contact.
Open/short circuit or harness damage in ignition
switch (IG1) circuit, or loose connector contact.
Open circuit or harness damage in engine-ECU
earth circuit, or loose connector contact.
Failed ETACS-ECU
Failed engine-ECU
STEP 3. Perform voltage measurement at engine
control relay connector
• Remove relay, and measure at relay box side.
• Voltage between terminal power supply lines and
body earth
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 4.
NO : Check and repair harness between battery
and engine control relay connector power
supply line.
• Check power supply line for
open/short circuit.
13A-148
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 4. Perform voltage measurement at
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Voltage between terminal C/R and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or check
and repair harness between engine control
relay connector terminal and engine-ECU
connector terminal C/R.
• Check signal line for open/short
circuit.
STEP 8. Check harness between engine-ECU
connector terminal BAT1 and engine control
relay connector terminal.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 9.
NO : Repair the damaged harness wire.
STEP 9. Check harness between battery and
engine control relay connector terminal.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Repair the damaged harness wire.
STEP 5. Perform voltage measurement at
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Short-circuit engine-ECU connector terminal C/R
to the body earth.
• Voltage between terminal BAT1 and body earth.
OK: System voltage
STEP 10. Perform voltage measurement at
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal IGN and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 8.
NO : Go to Step 6.
Q: Is the check result normal?
YES : Go to Step 15 <Vehicles without KOS>.
YES : Go to Step 16 <Vehicles with KOS>.
NO : Go to Step 11.
STEP 6. Check harness between engine control
relay connector terminal and engine-ECU
connector terminal BAT1.
• Check output line for open/short circuit.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 7. Check harness between the battery and
engine control relay connector terminal.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Check and repair harness between engine
control relay connector terminal and
engine-ECU connector terminal C/R.
• Check signal line for damage.
NO : Repair the damaged harness wire.
YES : Check and repair harness between ignition
switch connector terminal IG1 line and
ETACS-ECU connector terminal IG1.
• Check signal line for open/short
circuit.
STEP 11. Perform voltage measurement at
ETACS-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal IGN and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 14.
NO : Go to Step 12 <Vehicles without KOS>.
NO : Go to Step 13 <Vehicles with KOS>.
STEP 12. Check ignition switch itself.
• Check ignition switch connector check.
• Check ignition switch itself (Refer to GROUP 54A
− Ignition switch − Inspection − Ignition Switch
Check ).
Q: Is the check result normal?
NO : Repair or replace the connector, or replace
the ignition switch.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
13A-149
STEP 13. Check harness between OSS-ECU
connector terminal IG1 and ETACS-ECU
connector terminal IG1.
• Check power supply line for open/short circuit.
STEP 16. Check harness between OSS-ECU
connector terminal IG1 and ETACS-ECU
connector terminal IG1.
• Check signal line for damage.
Q: Is the check result normal?
YES : Perform troubleshooting of OSS System
Q: Is the check result normal?
YES : Go to Step 17.
NO : Repair or replace the connector, or repair
(Refer to GROUP 42B − Troubleshooting −
Trouble Symptom Chart ).
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 14. Continuity check on ETACS-ECU
connectors
• Disconnect connectors, and measure at the
ETACS-ECU side.
• Continuity test between terminal IG1 and IGN.
NOTE: Connect the (+) side of circuit tester to terminal IGN.
OK: Continuity
Q: Is the check result normal?
YES : Check and repair harness between
ETACS-ECU connector terminal IGN and
engine-ECU connector terminal IGN.
• Check signal line for open/short
circuit.
NO : Replace the ETACS-ECU.
STEP 15. Check harness between ignition switch
connector terminal IG1 line and ETACS-ECU
connector IG1.
• Check signal line for damage.
Q: Is the check result normal?
YES : Go to Step 17.
NO : Repair or replace the connector, or repair
the damaged harness wire.
the damaged harness wire.
STEP 17. Continuity check on ETACS-ECU
connectors
• Disconnect connectors, and measure at the
ETACS-ECU side.
• Continuity test between terminal IG1 and IGN.
NOTE: Connect the (+) side of circuit tester to terminal IGN.
OK: Continuity
Q: Is the check result normal?
YES : Go to Step 18.
NO : Replace the ETACS-ECU.
STEP 18. Check harness between ETACS-ECU
connector terminal IGN and engine-ECU
connector terminal IGN.
• Check signal line for damage.
Q: Is the check result normal?
YES : Go to Step 19.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 19. Check harness between engine-ECU
connector terminal GNDB, GNDE and body earth.
• Check earthing line for open circuit and damage.
Q: Is the check result normal?
YES : Replace the engine-ECU.
NO : Repair the damaged harness wire.
Inspection Procedure 20: Fuel Pump System
OPERATION
• The fuel pump drive power is supplied from
engine control relay to fuel pump relay
(ETACS-ECU connector terminal F/PB) in the
ETACS-ECU.
• The battery voltage is applied by the ignition
switch <Vehicles without KOS> or the OSS-ECU
<Vehicles with KOS> to the fuel pump relay coil
(ETACS-ECU connector terminal IG1) in the
ETACS-ECU. The engine-ECU turns on the relay
by turning ON the power transistor in the unit so
as to conduct power to the fuel pump relay coil
(via the ETACS-ECU connector terminal FP/R).
13A-150
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
• When the fuel pump relay is turned ON, the battery voltage will be supplied from the fuel pump
relay (ETACS-ECU connector terminal F/PB) to
the fuel pump connector terminal.
FUNCTION
• When the ignition switch ON signal is inputted
into the engine-ECU, the engine-ECU turns ON
the fuel pump relay. This causes the battery voltage to be supplied to the fuel pump.
STEP 4. Perform voltage measurement at
ETACS-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal F/PB and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 6.
NO : Go to Step 5.
PROBABLE CAUSES
• Failed fuel pump relay in the ETACS-ECU
• Failed fuel pump
• Open/short circuit or harness damage in fuel
pump drive circuit, or loose connector contact.
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Connector check: ETACS-ECU
connectors
STEP 5. Connector check: Engine control relay
connector
Q: Is the check result normal?
YES : Check and repair harness between engine
control relay connector terminal and
ETACS-ECU connector terminal F/PB.
• Check power supply line for
open/short circuit.
NO : Repair or replace the connector.
Q: Are the check results normal?
YES : Go to Step 2.
NO : Repair or replace the connector.
STEP 6. Check fuel pump operations.
• Fuel pump connector check.
• Fuel tank pump operation check (Refer to
P.13A-182).
STEP 2. Check fuel pump relay.
• Fuel pump relay continuity check (Refer to
P.13A-184).
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair or replace the connector, or replace
Q: Is the check result normal?
YES : Go to Step 3.
NO : Replace the ETACS-ECU.
STEP 3. Perform voltage measurement at
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal FP/R and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or check
and repair harness between engine-ECU
connector terminal FP/R and ETACS-ECU
connector terminal FP/R.
• Check power supply line for
open/short circuit.
the fuel tank pump and gauge assembly.
STEP 7. Perform resistance measurement at fuel
pump connector.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal earth line and body
earth.
OK: Continuity (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 8.
NO : Check and repair harness between fuel
pump connector terminal earth line and
body earth.
• Check earthing line for open circuit
and damage.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
13A-151
YES : Go to Step 11.
NO : Repair or replace the connector, or repair
STEP 8. Perform voltage measurement at fuel
pump connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal power supply line and
body earth.
OK: System voltage
STEP 11. Check harness between ETACS-ECU
connector terminal F/P and fuel pump connector
terminal.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Go to Step 9.
Q: Is the check result normal?
YES : Go to Step 12.
NO : Repair the damaged harness wire.
STEP 9. Check harness between ETACS-ECU
connector terminal F/P and fuel pump connector.
• Check power supply line for open/short circuit.
STEP 12. M.U.T.-III actuator test
• Item 9: Fuel pump
OK: Operating sound of fuel pump can be
heard.
Q: Is the check result normal?
YES : Check and repair harness between
engine-ECU connector terminal FP/R and
ETACS-ECU connector terminal FP/R.
• Check power supply line for damage.
NO : Repair the damaged harness wire.
STEP 10. Check harness between engine control
relay connector terminal and ETACS-ECU
connector terminal F/PB.
• Check power supply line for damage.
the damaged harness wire.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
Q: Is the check result normal?
Inspection Procedure 21: A/C Compressor Relay System
OPERATION
• Battery voltage is applied to the A/C compressor
relay connector terminal.
• Engine-ECU connector terminal AC/R applies
current to the A/C compressor relay coil by turning ON the power transistor in the unit in order to
turn the relay ON.
• When the A/C compressor relay turns ON, battery voltage is supplied by the A/C compressor
relay connector terminal to the A/C compressor
connector terminal.
FUNCTION
• When the A/C switch ON signal is input into the
engine-ECU, the engine-ECU turns ON the A/C
compressor relay. This causes battery voltage to
be supplied to the A/C compressor assembly and
the A/C compressor clutch actuates.
PROBABLE CAUSES
• Failed A/C compressor relay
• Failed A/C compressor assembly
• Open/short circuit or harness damage in A/C
compressor relay circuit, or loose connector contact.
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check A/C compressor relay itself.
• A/C compressor relay connector check.
• Check A/C compressor relay itself (Refer to
GROUP 55 − On-vehicle Service − Relay Check
).
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair or replace the connector or replace
the A/C compressor relay.
13A-152
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 2. Perform voltage measurement at A/C
compressor relay.
• Disconnect relay, and measure at relay box side.
• Voltage between terminal power supply lines and
body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 3.
NO : Check and repair harness between battery
and A/C compressor relay connector
terminals.
• Check power supply line for
open/short circuit.
STEP 3. Check harness between battery and A/C
compressor relay connector terminal.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair the damaged harness wire.
STEP 4. Perform voltage measurement at
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Voltage between terminal AC/R and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the connector, or check
and repair harness between A/C
compressor relay connector terminal and
engine-ECU connector terminal AC/R.
• Check signal line for open/short
circuit.
STEP 5. Check harness between A/C compressor
relay connector terminal and engine-ECU
connector terminal AC/R.
• Check signal line for damage.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair the damaged harness wire.
STEP 6. Check harness between A/C compressor
relay connector terminal and A/C compressor
assembly connector terminal.
• Check power supply line for open/short circuit
and damage.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 7. Check A/C compressor clutch operating
conditions.
• Disconnect engine-ECU connector, and short-circuit terminal AC/R to the body earth.
OK: A/C compressor clutch operates.
Q: Is the check result normal?
YES : Replace the engine-ECU.
NO : Replace the A/C compressor assembly.
Inspection Procedure 22: Ignition Circuit System
OPERATION
• The battery voltage is applied from the engine
control relay connector terminal to the ignition coil
connector terminal and is earthed to the vehicle
body via the ignition coil connector terminal No.
1.
• A power voltage of 12 V is applied to the ignition
coil connector terminal from the engine-ECU connector terminal CIL1, CIL2, CIL3 and CIL4).
• When the power transistor in the ignition coil is
turned to ON with any signal from the
engine-ECU, the primary voltage will be applied
through the ignition coil. When the power transis-
FUNCTION
• When the engine-ECU turn the power transistor
in the unit to OFF, the battery voltage is applied to
the power transistor in the ignition coil, resulting
that the power transistor is ON. And, when the
engine-ECU turns the power transistor in the unit
to ON, the power transistor in the ignition coil will
be turned OFF.
tor in the ignition coil is turned OFF, the primary
current is blocked and high voltage is generated
in the secondary coil.
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
PROBABLE CAUSES
• Failed spark plug
• Failed ignition coil
• Open/short circuit or harness damage in ignition
system circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Visual check of ignition spark.
• Remove the spark plug and install it to the ignition
coil.
• Connect the ignition coil connector.
• Disconnect all injector connectors.
• At the engine start, check each spark plug produces a spark.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Go to Step 2.
STEP 2. Check spark plug.
• Check spark plug (Refer to GROUP 16 − Ignition
System − On-vehicle Service − Spark Plug Check
and Cleaning ).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Replace the spark plug.
STEP 3. Check ignition coil itself.
• Ignition coil connector check.
• Check ignition coil itself (Refer to GROUP 16 −
Ignition System − On-vehicle Service − Ignition
Coil Check ).
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the connector, or replace
the ignition coil.
STEP 4. Perform voltage measurement at ignition
coil connectors.
• Disconnect connector, and measure at harness
side.
• Ignition switch: "ON"
• Voltage between terminal power supply line and
body earth.
OK: System voltage
Q: Are the check results normal?
13A-153
YES : Go to Step 6.
NO : Go to Step 5.
STEP 5. Connector check: engine control relay
connector
Q: Is the check result normal?
YES : Check intermediate connector, and repair if
necessary. If intermediate connector is
normal, check and repair harness between
engine control relay connector terminal and
ignition coil connector terminal.
• Check power supply line for
open/short circuit.
NO : Repair or replace the connector.
STEP 6. Perform resistance measurement at
ignition coil connectors.
• Disconnect connector, and measure at harness
side.
• Resistance between terminal earth line and body
earth.
OK: Continuity (2 Ω or less)
Q: Are the check results normal?
YES : Go to Step 7.
NO : Check and repair harness between ignition
coil connector terminal earth line and body
earth.
• Check earthing line for open circuit
and damage.
STEP 7. Check harness between ignition coil
connector and engine-ECU connector.
a. Check and repair harness between ignition coil
connector terminal and engine-ECU connector
terminal CIL1.
b. Check and repair harness between ignition coil
connector terminal and engine-ECU connector
terminal CIL2.
c. Check and repair harness between ignition coil
connector terminal and engine-ECU connector
terminal CIL3.
d. Check and repair harness between ignition coil
connector terminal and engine-ECU connector
terminal CIL4.
• Check signal line for open/short circuit and damage.
Q: Are the check results normal?
YES : Go to Step 8.
NO : Repair or replace the connector, or repair
the damaged harness wire.
13A-154
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
STEP 8. Check harness between engine control
relay connector terminal and ignition coil
connector terminal.
• Check power supply line for damage.
Q: Are the check results normal?
YES : Go to Step 9.
NO : Repair the damaged harness wire.
STEP 9. Check the trouble symptom.
Q: Does the trouble symptom persist?
YES : Replace the engine-ECU.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
Inspection Procedure 23: Engine Oil Pressure Switch System
OPERATION
• Battery voltage is applied to the engine oil pressure switch connector terminal from the
engine-ECU connector terminal OPSW.
FUNCTION
• Detect the oil pressure conditions and enter the
result into the engine-ECU. After starting the
engine if the oil pressure rises to higher than the
given pressure, the engine oil pressure switch
turns OFF. Under this condition the engine-ECU
sends the command of turning off the oil warning
lamp to the combination meter via CAN.
PROBABLE CAUSES
• Failed engine oil pressure switch
• Open/short circuit or harness damage in engine
oil pressure switch circuit or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Perform voltage measurement at engine
oil pressure switch connector
• Disconnect connector, and measure at the harness side.
• Ignition switch: "ON"
• Voltage between terminal and body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 4.
NO : Go to Step 2.
STEP 2. Check harness between engine oil
pressure switch connector terminal and
engine-ECU connector terminal OPSW.
• Check output line for open/short circuit.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair or replace the connector, or repair
the damaged harness wire.
STEP 3. M.U.T.-III data list
• Data list reference table (Refer to P.13A-155).
a. Item 90: Engine oil pressure switch
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
NO : Replace the engine-ECU.
STEP 4. Perform voltage measurement at
engine-ECU connector.
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB992110) to measure at connector for inspection.
• Engine: Idling
• Voltage between terminal OPSW and body earth.
OK:
1 V or less (ignition switch: "ON")
System voltage (during idling)
Q: Is the check result normal?
YES : Go to Step 3.
NO : Go to Step 5.
STEP 5. Check harness between engine oil
pressure switch connector terminal and
engine-ECU connector terminal OPSW.
• Check output line for damage.
Q: Is the check result normal?
YES : Replace the engine oil pressure switch.
NO : Repair or replace the connector, or repair
the damaged harness wire.
MULTIPOINT FUEL INJECTION (MPI)
13A-155
TROUBLESHOOTING
Inspection Procedure 24: In Running, The ECO Mode Indicator Shows Nothing
COMMENTS ON TROUBLE SYMPTOM
• Under a good driving conditions of fuel consumption, the engine-ECU shows ECO mode indicator
through the CAN.
• If the engine-ECU does not show ECO mode
indicator no matter how the vehicle runs, the possible causes are a abnormal combination meter,
also abnormal communication between the
engine-ECU and the combination meter.
PROBABLE CAUSES
• Failed ECO mode indicator
• Open/short circuit in combination meter circuit
DIAGNOSIS PROCEDURE
YES : Inspection chart for diagnosis code (Refer
to P.13A-23).
NO : Go to Step 2P.13A-155.
STEP 2. Check the trouble symptom.
Q: Does the trouble symptom persist?
YES : Check combination meter system (Refer to
GROUP 54A − Combination Meter −
Trouble Symptom Chart ).
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunctions
).
STEP 1. M.U.T.-III diagnosis code
Q: Is diagnosis code set?
DATA LIST REFERENCE TABLE
M1131152005462
WARNING
When touching the throttle valve, surely shut off the driving circuits of the throttle valve. In
the event that the throttle valve is operated, a finger might be injured as the result of being
caught by the throttle valve.
Item
No.
Inspection
Item
Inspection condition
Normal condition
Code
Reference
No. or
page
inspecti
on
procedu
re No.
1
Battery
voltage
Ignition switch: "ON"
System voltage
Procedur P.13A-147
e No. 19
MULTIPOINT FUEL INJECTION (MPI)
13A-156
TROUBLESHOOTING
Item
No.
Inspection
Item
Inspection condition
2
Crank angle
sensor
• Engine: Cranking Compare engine
Matched
speed on
• Tachometer:
tachometer with the
Connected
value displayed on
M.U.T.-III
Engine: Idle
operation
Normal condition
Engine coolant
1,400 − 1,600 r/min
temperature: −20°C <4B11>
1,300 − 1,500 r/min
<4B12>
Engine coolant
temperature: 0°C
1,350 − 1,550 r/min
<4B11>
1,300 − 1,500 r/min
<4B12>
Engine coolant
temperature: 20°C
1,200 − 1,400 r/min
<4B11>
1,300 − 1,500 r/min
<4B12>
Engine coolant
temperature: 40°C
950 − 1,150 r/min
<4B11>
1,200 − 1,400 r/min
<4B12>
Engine coolant
temperature: 80°C
600 − 800 r/min
<4B11>
550 − 750 r/min
<4B12>
Code
Reference
No. or
page
inspecti
on
procedu
re No.
Code
No.
P0335
P.13A-78
MULTIPOINT FUEL INJECTION (MPI)
13A-157
TROUBLESHOOTING
Item
No.
Inspection
Item
Inspection condition
3
Target idling Engine: Idle
speed
operation
Normal condition
Code
Reference
No. or
page
inspecti
on
procedu
re No.
Engine coolant
1,400 − 1,600 r/min −
temperature: −20°C <4B11>
−
1,300 − 1,500 r/min
<4B12>
Engine coolant
temperature: 0°C
1,350 − 1,550 r/min
<4B11>
1,300 − 1,500 r/min
<4B12>
Engine coolant
temperature: 20°C
1,200 − 1,400 r/min
<4B11>
1,300 − 1,500 r/min
<4B12>
Engine coolant
temperature: 40°C
950 − 1,150 r/min
<4B11>
1,200 − 1,400 r/min
<4B12>
Engine coolant
temperature: 80°C
600 − 800 r/min
<4B11>
550 − 750 r/min
<4B12>
4
Vehicle
speed
Running at 40 km/h
5
Intake air
Ignition switch:
temperature "ON" or engine
sensor
running
Approximately 40
km/h
Intake air
−20°C
temperature: −20°C
Intake air
temperature: 0°C
0°C
Intake air
temperature: 20°C
20°C
Intake air
temperature: 40°C
40°C
Intake air
temperature: 80°C
80°C
−
−
Code
No.
P0112,
P0113
P.13A-39,
P.13A-40
MULTIPOINT FUEL INJECTION (MPI)
13A-158
TROUBLESHOOTING
Item
No.
Inspection
Item
6
Engine
Ignition switch:
coolant
"ON" or engine
temperature running
sensor
8
10
Manifold
absolute
pressure
sensor
Air flow
sensor *1
Inspection condition
Normal condition
Engine coolant
−20°C
temperature: −20°C
Engine coolant
temperature: 0°C
0°C
Engine coolant
temperature: 20°C
20°C
Engine coolant
temperature: 40°C
40°C
Engine coolant
temperature: 80°C
80°C
Altitude: 0 m
101 kPa
Altitude: 600 m
95 kPa
Altitude: 1,200 m
88 kPa
Altitude: 1,800 m
81 kPa
Set the vehicles to
the pre-inspection
condition
Engine: Idle
operation
28.0 − 41.4 kPa
Engine: Excessive
acceleration
Varies depending
on the negative
pressure at the inlet
manifold
Set the vehicles to
the pre-inspection
condition
Engine: Idle
operation
1,350 − 1,670 mV
<4B11>
Ignition switch:
"ON"
(engine stopped)
1,360 − 1,650 mV
<4B12>
Code
Reference
No. or
page
inspecti
on
procedu
re No.
Code
No.
P0117,
P0118
P.13A-41,
P.13A-42
Code
No.
P0107,
P0108
P.13A-36,
P.13A-37
Code
No.
P0102,
P0103
P.13A-33,
P.13A-35
Code
No.
P2122,
P2123
P.13A-102,
P.13A-104
Engine: 2,500 r/min 1,620 − 2,020 mV
<4B11>
1,800 − 2,100 mV
<4B12>
11
Accelerator
pedal
position
sensor
(main)
Ignition switch:
"ON"
Engine: Excessive
acceleration
Varies depending
on the acceleration
Release the
accelerator pedal
900 − 1,100 mV
Depress the
accelerator pedal
Increases in
response to the
pedal depression
stroke
Depress the
accelerator pedal
fully
4,000 mV or more
MULTIPOINT FUEL INJECTION (MPI)
13A-159
TROUBLESHOOTING
Item
No.
Inspection
Item
12
Accelerator Ignition switch:
pedal
"ON"
position
sensor (sub)
13
Throttle
position
sensor
(main)
Inspection condition
Normal condition
Code
Reference
No. or
page
inspecti
on
procedu
re No.
Release the
accelerator pedal
400 − 600 mV
P.13A-105,
P.13A-106
Depress the
accelerator pedal
Increases in
response to the
pedal depression
stroke
Code
No.
P2127,
P2128
Depress the
accelerator pedal
fully
2,000 mV or more
• Remove the
intake air hose at
the throttle body
• Disconnect the
connector of the
electronic-control
led throttle valve
• With the special
tool test harness
(MB991658)
bridge only the
mating terminals
of No. 3, No. 4,
No. 5, and No. 6
of the
disconnected
connectors
• Ignition switch:
"ON" (engine
stopped)
Fully close the
throttle valve with
your finger
300 − 700 mV
P.13A-45,
P.13A-46
Fully open the
throttle valve with
your finger
4,000 mV or more
Code
No.
P0122,
P0123
• Set the vehicle to
the
pre-inspection
condition
• Engine: Idle
operation
No load
500 − 660 mV
A/C switch:
"OFF" → "ON"
Voltage rises
Transmission: N →
D range
13A-160
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
Item
No.
Inspection
Item
Inspection condition
Normal condition
Code
Reference
No. or
page
inspecti
on
procedu
re No.
15
Throttle
position
sensor (sub)
• Remove the
intake air hose at
the throttle body.
• Disconnect the
connector of the
electronic-control
led throttle valve
• With the special
tool test harness
(MB991658)
bridge only the
mating terminals
of No. 3, No. 4,
No. 5, and No. 6
of the
disconnected
connectors
• Ignition switch:
"ON" (engine
stopped)
Fully close the
throttle valve with
your finger
4,000 mV or more
Fully open the
throttle valve with
your finger
1,000 mV or less
Code
No.
P0222,
P0223
• Set the vehicle to
the
pre-inspection
condition
• Install timing light
(for use to
measure actual
ignition timing)
Engine: Idle
2 − 18 °CA (BTDC) −
operation
(Approximately 1
minute passes after
the engine starting
sequence is
completed, and
then the engine is
in the steady state)
16
Ignition
advance
P.13A-60,
P.13A-61
−
Engine: 2,500 r/min 34 − 50 °CA
(BTDC) <4B11>
30 − 46 °CA
(BTDC) <4B12>
17
Injector drive Set the vehicles to
the pre-inspection
time*2
condition
Engine: Idle
operation
1.3 − 3.3 ms
<4B11>
2.1 − 3.3 ms
<4B12>
Engine: 2,500 r/min 1.0 − 3.0 ms
<4B11>
2.0 − 3.2 ms
<4B12>
Engine: Excessive
acceleration
Increased
−
−
MULTIPOINT FUEL INJECTION (MPI)
13A-161
TROUBLESHOOTING
Item
No.
Inspection
Item
21
Electric
• Engine: Idle operation after warm-up Approximately 110
power
• Turn the steering wheel to the left and A or less
steering
right with a vehicle stationary.
current value
36
V.V.T. phase Engine: Idle operation
angle
(intake)
74
Stop lamp
switch
Inspection condition
Normal condition
−
−6 to 0 °CA (ATDC) Code
No.
<4B11>
P0011
−3 to 3 °CA (ATDC)
<4B12>
Engine: Middle speed and high load
operation
Decreases
(advances)
Ignition switch:
"ON"
ON
Depressed the
brake pedal
Code
Reference
No. or
page
inspecti
on
procedu
re No.
−
P.13A-27
−
−
−
−
Released the brake OFF
pedal
76
79
A/C switch
Cranking
signal
(Ignition
switch-ST)
Engine: Idle
operation after
warm-up
A/C switch: "OFF"
OFF
A/C switch: "ON"
(when the
compressor clutch
is operated)
ON
Ignition switch: "ON"
OFF
Engine: Cranking
ON
Procedur P.13A-128
e No. 4
83
Power
Data items are displayed on M.U.T.-III
OFF
steering fluid display, but this item is not applicable and
pressure
its data is displayed as "OFF".
switch
−
−
84
Idling switch Ignition switch:
"ON"
−
−
ON
−
−
Selector lever: P or ON
N
−
−
−
−
85
Ignition
switch-IG
Ignition switch: "ON"
87
Neutral
switch
Ignition switch:
"ON"
89
Normally
Ignition switch:
closed brake "ON"
switch
Depress the
accelerator pedal.
OFF
Release the
accelerator pedal.
ON
Selector lever:
Other than P or N
OFF
Depress the brake
pedal.
OFF
Release the brake
pedal.
ON
MULTIPOINT FUEL INJECTION (MPI)
13A-162
Item
No.
Inspection
Item
90
93
TROUBLESHOOTING
Inspection condition
Normal condition
Code
Reference
No. or
page
inspecti
on
procedu
re No.
Oil pressure Ignition switch: "ON"
switch
Engine: Idle operation after warm-up
ON
Procedur P.13A-154
e No. 23
A/C
compressor
relay
A/C switch: "OFF"
OFF
A/C switch: "ON"
(when the
compressor clutch
is operated)
ON
Procedur P.13A-151
e No. 21
Engine: Idle
operation after
warm-up
OFF
95
Engine
Ignition switch: "ON"
control relay
ON
−
−
96
Throttle
Ignition switch: "ON"
valve control
servo relay
ON
−
−
97
Fuel pump
relay
Ignition switch: "ON"
OFF
Engine: Idle operation
ON
Procedur P.13A-149
e No. 20
102
Starter relay Ignition switch: "ON"
OFF
Engine: Cranking
AA
Air flow
sensor*1
Set the vehicles to
the pre-inspection
condition
ON
Engine: Idle
operation
1.3 − 5.3 g/s
<4B11>
2.0 − 4.0 g/s
<4B12>
Engine: 2,500 r/min 5.0 − 13.0 g/s
<4B11>
8.0 − 12.0 g/s
<4B12>
Engine: Excessive
acceleration
Varies depending
on the acceleration
Procedur P.13A-128
e No. 4
Code
No.
P0102,
P0103
P.13A-33,
P.13A-35
MULTIPOINT FUEL INJECTION (MPI)
13A-163
TROUBLESHOOTING
Item
No.
Inspection
Item
Inspection condition
Normal condition
Code
Reference
No. or
page
inspecti
on
procedu
re No.
AB
Throttle
position
sensor
(main)
• Remove the
intake air hose at
the throttle body
• Disconnect the
connector of the
electronic-control
led throttle valve
• With the special
tool test harness
(MB991658)
bridge only the
mating terminals
of No. 3, No. 4,
No. 5, and No. 6
of the
disconnected
connectors
• Ignition switch:
"ON" (engine
stopped)
Fully close the
throttle valve with
your finger
6 − 14 %
P.13A-45,
P.13A-46
Fully open the
throttle valve with
your finger
80 − 96 %
Code
No.
P0122,
P0123
Oxygen
sensor
(front)
Engine: After
warm-up (leaner by
deceleration, richer
acceleration)
Engine: Excessive
deceleration from
4,000 r/min
0.2 V or less
Engine: At
excessive
acceleration
0.6 to 1.0 V
P0131,
P0132,
P0133,
P0134
P.13A-49,
P.13A-50,
P.13A-51,
P.13A-52
AC
Engine: After
Engine: Idle
0.4 V or less ⇔ 0.6
warm-up (use
operation
to 1.0 V (varies)
oxygen sensor
Engine: 2,500 r/min
signals, check the
air-fuel ratio and the
conditions under the
control of the
engine-ECU)
AD
Oxygen
• Transmission: Ds range
sensor (rear) • The engine speed is maintained to
3,500 r/min or more during an
accelerated driving with the throttle
full-open
0.6 − 1.0 V
Code
No.
P0137,
P0138
P.13A-54,
P.13A-55
BB
Barometric
pressure
Altitude: 0 m
101 kPa
−
−
Altitude: 600 m
95 kPa
Altitude: 1,200 m
88 kPa
Altitude: 1,800 m
81 kPa
Ignition switch:
"ON"
13A-164
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
Item
No.
Inspection
Item
Inspection condition
Normal condition
Code
Reference
No. or
page
inspecti
on
procedu
re No.
BC
Throttle
position
sensor
(relative
value)
• Remove the
intake air hose at
the throttle body
• Disconnect the
connector of the
electronic-control
led throttle valve
• With the special
tool test harness
(MB991658)
bridge only the
mating terminals
of No. 3, No. 4,
No. 5, and No. 6
of the
disconnected
connectors
• Ignition switch:
"ON" (engine
stopped)
Fully close the
throttle valve with
your finger
0−5%
−
−
Fully open the
throttle valve with
your finger
88 − 100 %
Throttle
position
sensor (sub)
• Remove the
intake air hose at
the throttle body
• Disconnect the
connector of the
electronic-control
led throttle valve
• With the special
tool test harness
(MB991658)
bridge only the
mating terminals
of No. 3, No. 4,
No. 5, and No. 6
of the
disconnected
connectors
• Ignition switch:
"ON" (engine
stopped)
Fully close the
throttle valve with
your finger
6 − 14 %
P.13A-60,
P.13A-61
Fully open the
throttle valve with
your finger
87 − 96 %
Code
No.
P0222,
P0223
BD
MULTIPOINT FUEL INJECTION (MPI)
13A-165
TROUBLESHOOTING
Item
No.
Inspection
Item
Inspection condition
Normal condition
Code
Reference
No. or
page
inspecti
on
procedu
re No.
BE
Accelerator
pedal
position
sensor
(main)
Ignition switch:
"ON"
Release the
accelerator pedal
16 − 24 %
P.13A-102,
P.13A-104
Depress the
accelerator pedal
Increases in
response to the
pedal depression
stroke
Code
No.
P2122,
P2123
Depress the
accelerator pedal
fully
80 % or more
Release the
accelerator pedal
6 − 14 %
P.13A-105,
P.13A-106
Depress the
accelerator pedal
Increases in
response to the
pedal depression
stroke
Code
No.
P2127,
P2128
Depress the
accelerator pedal
fully
40 % or more
Release the
accelerator pedal
0−5%
−
−
Depress the
accelerator pedal
Increases in
response to the
pedal depression
stroke
Depress the
accelerator pedal
fully
95 − 100 %
BF
DD
Accelerator Ignition switch:
pedal
"ON"
position
sensor (sub)
Accelerator
pedal
position
sensor
(relative
value)
Ignition switch:
"ON"
NOTE: *1: On the new vehicle (mileage: 500 km or less), air flow sensor output value may be higher by
approximately 10 %.
NOTE: *2: On the new vehicle (mileage: 500 km or less), injector drive time may be longer by approximately
10 %.
Engine-ECU monitoring items
• This monitor item includes many useful items for understanding the engine conditions controlled by the
engine-ECU.
• However, it is hard to show the definite specification of each item, since its value may vary to a large
extent with a little difference in the measuring conditions, environment, and changes with the lapse of
time, etc. on the objective vehicle. Therefore, this document will describe only the check conditions, display range, and behaviour of numeric values.
13A-166
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
Item INSPECTION ITEM
No.
M.U.T.-III display
descriptions
Standards at each
check
Display range,
and numeric
value
14
Throttle position sensor
(main) learning value
• The following shows
learning values of throttle
valve opening angle at
idling.
Ignition switch: "ON"
500 − 2,000 mV
26
Long-term fuel trim
• Indicates the long-term
air-fuel ratio feedback
amount.
• The negative side shows a
reduction in the injection
amount, while the positive
side shows an increase.
Ignition switch: "ON"
−10 to 10 %
<4B11>
Engine: After warm-up, −25 to 25 %
2,500 r/min without any
load (under the air-fuel
ratio feedback control)
−12.5 to 12.5 %
<4B12>
28
Short-term fuel trim
• Indicates the short-term
air-fuel ratio feedback
amount.
• The negative side shows a
reduction in the injection
amount, while the positive
side shows an increase.
32
Detonation retard
• Indicates the ignition timing Engine: Excessive
retardation angle that is
acceleration after
controlled by the detonation warm-up
sensor output.
Retards
depending on the
degree (angle) of
acceleration
33
Detonation control
learned value
• Indicates the learning value Ignition switch: "ON"
to compensate for the
ignition timing that is
controlled by the detonation
sensor output.
• 0 %side is retardation, and
100 % side is advance.
0 − 100 %
47
Fan motor duty
• Indicates the duty ratio for
the electric cooling fan.
• Engine: After
warm-up
• A/C switch: "ON"
(when the
compressor is
active)
0 − 100 %
49
Purge control solenoid
valve duty
• Indicates the duty ratio for
the purge control solenoid
valve.
Engine: After warm-up
(when 1 minute has
elapsed)
0 − 100 %
58
Throttle valve control
servo
• Indicates the target opening Engine: After warm-up
angle of throttle valve.
0 − 100 %
59
Throttle valve control
servo target value
• Indicates the target opening Engine: After warm-up
angle of throttle valve.
0 − 5.0 V
MULTIPOINT FUEL INJECTION (MPI)
13A-167
TROUBLESHOOTING
Item INSPECTION ITEM
No.
M.U.T.-III display
descriptions
Standards at each
check
Display range,
and numeric
value
68
Idle speed control
learned value (A/C
OFF)
• Indicates the leaning value
to compensate for the
opening angle of idling
speed control (opening
angle of throttle valve).
• The negative side shows
"close" side, while the
positive side shows "open"
side.
Ignition switch: "ON"
−1 to 2.5 L/s
69
Idle speed control
• Indicates the leaning value Ignition switch: "ON"
learned value (A/C ON)
to compensate for the
opening angle of idling
speed control (opening
angle of throttle valve) with
the air conditioner turned
"ON".
• The negative side shows
"close" side, while the
positive side shows "open"
side.
−1 to 2.5 L/s
72
Absolute load value
• Indicates the size of engine Engine: After warm-up
load.
0 − 100 %
73
Calculated load value
• Indicates the size of engine Engine: After warm-up
load.
0 − 100 %
105
Fuel system status
• Indicates the air-fuel ratio
Engine: After warm-up
feedback control
conditions.
OL: Open loop*1
CL: Closed loop*2
OL-DRV: Condition of open
loop due to acceleration
and deceleration driving
OL-SYS: Condition of open
loop due to system
failure.
CL-HO2: Condition of
closed loop only using
front oxygen sensor
when rear oxygen sensor
is failed
Varies depending
on the drive
conditions
106
Fuel system status 2
Data items are displayed on M.U.T.-III display, but the
in-line 4 engine is not applicable and its data is
displayed as "N/A".
N/A
NOTE: *1: Condition in which fuel is controlled without oxygen sensor signals being fed back to the
engine-ECU because the condition to shift to the closed loop is not met.
NOTE: *2: Condition in which oxygen sensor signals are fed back to the engine-ECU for controlling fuel.
MULTIPOINT FUEL INJECTION (MPI)
13A-168
TROUBLESHOOTING
ACTUATOR TEST REFERENCE TABLE
M1131152503557
Item Inspection Drive content
No. Item
Inspection condition
Normal
condition
Code No. Reference
or
page
inspection
procedure
No.
Idle condition is
changed by
stopping
selected
cylinder: this
can cause an
unstable
condition and
the engine may
stall.
Code No.
P0261,
P0262,
P0264,
P0265,
P0267,
P0268,
P0270,
P0271
Procedure P.13A-149
No. 20
1
Injectors
Specified injector is Engine: warm up, idle
stopped
(cut the fuel supply to
each injector in turn and
check cylinders which
don't affect idling.)
9
Fuel pump
Drive fuel pump to
circulate fuel
• Ignition switch: "ON"
• Check for pump
operating noise near
fuel tank
Operating
noise audible
10
Purge
control
solenoid
valve
Switch solenoid
valve from OFF to
ON
Ignition switch: "ON"
When the valve Code No.
is actuated,
P0458,
operating noise P0459
is audible
14
Cooling fan Actuate the fan
motor
motor
Ignition switch: "ON"
Fan motor
rotates at high
speed
−
16
A/C
Switch the A/C
compressor compressor relay
relay
from OFF to ON
Ignition switch: "ON"
The operating
sound of A/C
compressor is
audible
Procedure P.13A-151
No. 21
17
Inlet oil
feeder
control
valve
Ignition switch: "ON"
When the valve Code No.
is actuated,
P0010
operating noise
is audible
Switch the inlet oil
feeder control
valve from OFF to
ON
P.13A-62,
P.13A-63,
P.13A-64,
P.13A-65,
P.13A-66,
P.13A-67,
P.13A-68,
P.13A-69
P.13A-83,
P.13A-84
−
P.13A-25
CHECK AT THE ECU TERMINALS
M1131153502513
Disconnect the engine-ECU connectors, and
connect check harness special tool MB992110
between the engine-ECU connectors.
1. Measure the voltage between each check
harness connector terminal and check harness
connector earth terminal (GNDB or GNDE).
2. Connect a needle-nosed wire probe to a voltmeter
probe.
3. Referring to the check sheet, insert the micromini
probe into the check harness connector and
measure the voltage.
NOTE: .
1. You may find it convenient to pull out the
engine-ECU to make it easier to reach the
connector terminals.
2. The chart procedures do not have the particular order.
MULTIPOINT FUEL INJECTION (MPI)
13A-169
TROUBLESHOOTING
CAUTION
Short-circuiting the positive (+) probe between a
connector terminal and earth could damage the
vehicle wiring, the sensor, engine-ECU or all of
them. Be careful to prevent this!
4. If voltmeter shows any division from standard
value, check the corresponding sensor, actuator
and related electrical wiring, then repair or
replace.
5. After repair or replacement, recheck with the
voltmeter to confirm that the repair has corrected
the problem.
TERMINAL VOLTAGE CHECK CHART
Special Tool Check Harness (MB992110) Connector Terminal Arrangement
82 81 80 79 78 77 76 75 74 73 72 71
16 15 14 13 12 11 10 9 8 7 6 5 4 3
94 93 92 91 90 89 88 87 86 85 84 83
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
106
105 104 103 102 101 100 99 98 97
118
117 116 115 114 113 112 111 110 109 108
96 95
107
2
1
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
AK502614 AO
Termin Termi
al No.
nal
code
Inspection Item
Check condition (Engine condition)
Normal condition
1
Inlet oil feeder control
valve
Ignition switch: "ON"
System voltage
Under the high load operation.
4 − 10 V*1
Engine: While engine is idling after having From 9 − 15 V*1, it
warmed up, suddenly depress the
is slightly reduced
accelerator pedal.
temporarily.
OCVI
2
INJ1
No. 1 injector
3
INJ2
No. 2 injector
18
INJ3
No. 3 injector
19
INJ4
No. 4 injector
4
CIL1
Ignition coil No. 1
5
CIL2
Ignition coil No. 2
20
CIL3
Ignition coil No. 3
21
CIL4
Ignition coil No. 4
6
NTSW Starter active signal
8
9
SGT
5V
Crank angle sensor
Sensor impressed
voltage
Engine: 3,000 r/min
0.3 − 3.0 V*1
Engine: Cranking
System voltage
Engine: Idling
1 V or less
Engine: Cranking
0.4 − 4.0 V*1
Engine: Idle operation
2.0 − 3.0 V*1
Ignition switch: "ON"
System voltage
MULTIPOINT FUEL INJECTION (MPI)
13A-170
TROUBLESHOOTING
Termin Termi
al No.
nal
code
Inspection Item
Check condition (Engine condition)
Normal condition
10
Throttle position sensor
(main)
• Remove the
intake air hose at
the throttle body.
• Disconnect the
connector of the
electronic-controll
ed throttle valve.
• With the special
tool test harness
(MB991658)
bridge only the
mating terminals
of No. 3, No. 4,
No. 5, and No. 6
of the
disconnected
connectors.
• Ignition switch:
"ON" (engine
stopped)
Fully close the
throttle valve with
your finger.
0.3 − 0.7 V
Fully open the
throttle valve with
your finger.
4.0 − 4.8 V
• Remove the
intake air hose at
the throttle body.
• Disconnect the
connector of the
electronic-controll
ed throttle valve.
• With the special
tool test harness
(MB991658)
bridge only the
mating terminals
of No. 3, No. 4,
No. 5, and No. 6
of the
disconnected
connectors.
• Ignition switch:
"ON" (engine
stopped)
Fully close the
throttle valve with
your finger.
4 V or more
Fully open the
throttle valve with
your finger.
1 V or less
11
TPSM
TPSS
Throttle position sensor
(sub)
12
TPS5
Applied voltage to the
throttle position sensor
Ignition switch: "ON"
4.9 − 5.1 V
14
CPI
Inlet camshaft position
sensor
Engine: Cranking
2.0 − 4.8 V*1
Engine: Idle operation
2.0 − 3.0 V*1
Throttle valve control
servo (+)
• Ignition switch: "ON"
• Accelerator pedal: fully closed → fully
opened
Decreases slightly
from the battery
voltage
15
ETV+
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
13A-171
Termin Termi
al No.
nal
code
Inspection Item
Check condition (Engine condition)
Normal condition
16
ETV-
Throttle valve control
servo (−)
• Ignition switch: "ON"
• Accelerator pedal: fully closed → fully
opened
Decreases slightly
from the battery
voltage
26
WTS
Engine coolant
temperature sensor
Ignition switch: "ON" When engine
3.9 − 4.5 V
coolant temperature
is −20°C
When engine
3.2 − 3.8 V
coolant temperature
is 0°C
When engine
2.3 − 2.9 V
coolant temperature
is 20°C
When engine
1.3 − 1.9 V
coolant temperature
is 40°C
When engine
0.7 − 1.3 V
coolant temperature
is 60°C
When engine
0.3 − 0.9 V
coolant temperature
is 80°C
Engine: Idle operation after warm-up
(20 seconds after starting engine)
9 − 11 V*1
Engine: Racing
System voltage
Engine: Idle operation after warm-up
(20 seconds after starting engine)
9 − 11 V*1
Engine: Racing
System voltage
OPSW Engine oil pressure
switch
Ignition switch: "ON"
1 V or less
Engine: Idle operation
System voltage
PURG Purge control solenoid
valve
Ignition switch: "ON"
System voltage
38
O2FL
Oxygen sensor (front)
Engine: Maintain 2,500 r/min after
warm-up
0.6 ⇔ 1.0 V
(repeat the
alteration)
39
OFLE
Oxygen sensor (front)
offset voltage
Ignition switch: "ON"
0.4 − 0.6 V
40
O2RL
Oxygen sensor (rear)
• Transmission: Ds range
• The engine speed is maintained to
3,500 r/min or more during an
accelerated driving with the throttle
full-open
1.0 − 1.5 V
41
ORLE
Oxygen sensor (rear)
offset voltage
Ignition switch: "ON"
0.4 − 0.6 V
34
35
36
37
OHFL
OHRL
Oxygen sensor (front)
heater
Oxygen sensor (rear)
heater
Engine: 3,000 r/min after warm-up (with 4 Voltage decreases
minutes after the engine starting sequence
is completed)
MULTIPOINT FUEL INJECTION (MPI)
13A-172
TROUBLESHOOTING
Termin Termi
al No.
nal
code
Inspection Item
Check condition (Engine condition)
Normal condition
44
MAP5
Applied voltage to the
manifold absolute
pressure sensor
Ignition switch: "ON"
4.9 − 5.1 V
45
MAP
Manifold absolute
pressure sensor
Ignition switch: "ON" At 0 m altitude
3.8 − 4.2 V
At 600 m altitude
3.5 − 3.9 V
At 1,200 m altitude
3.3 − 3.7 V
At 1,800 m altitude
3.0 − 3.4 V
Engine: Idle operation after warm-up
0.6 − 1.4 V
Engine: While the engine is idling after
warm-up, quickly depress the accelerator
pedal
Varies depending
on the negative
pressure at the
inlet manifold
60
ALTG
Alternator G terminal
•
•
•
•
•
Engine: Idle operation after warm-up
Radiator fan: Non-operation
Head lamp switch: "OFF" → "ON"
Stop lamp: "OFF" → "ON"
Rear defogger switch: "OFF" → "ON"
Voltage rises
61
ALTF
Alternator FR terminal
•
•
•
•
•
Engine: Idle operation after warm-up
Radiator fan: Non-operation
Head lamp switch: "OFF" → "ON"
Stop lamp: "OFF" → "ON"
Rear defogger switch: "OFF" → "ON"
Voltage decreases
62
ALTL
Alternator L terminal
Ignition switch: "ON"
0.5 − 2.0 V
Engine: Idle operation
System voltage
72
RBB
Power supply voltage
applied to throttle valve
control servo
Ignition switch: "ON"
System voltage
73
C/R
Engine control relay
Ignition switch: "LOCK" (OFF)
System voltage
Ignition switch: "ON"
1 V or less
Ignition switch: "ON" Release the
accelerator pedal
0.9 − 1.1 V
Depress the
accelerator pedal
fully
4.0 − 4.8 V
74
APSM Accelerator pedal
position sensor (main)
75
APS5
Applied voltage to the
accelerator pedal
position sensor (main)
Ignition switch: "ON"
4.9 − 5.1 V
77
APSS
Accelerator pedal
position sensor (sub)
Ignition switch: "ON" Release the
accelerator pedal.
0.4 − 0.6 V
Depress the
accelerator pedal
fully
2.0 − 2.5 V
78
5VV
Applied voltage to the
accelerator pedal
position sensor (sub)
Ignition switch: "ON"
4.9 − 5.1 V
MULTIPOINT FUEL INJECTION (MPI)
TROUBLESHOOTING
13A-173
Termin Termi
al No.
nal
code
Inspection Item
Check condition (Engine condition)
Normal condition
82
BAT1
Power supply
Ignition switch: "ON"
System voltage
84
C/RL
Throttle valve control
servo relay
Ignition switch: "LOCK" (OFF)
0 − 0.1 V
Ignition switch: "ON"
1 V or less
87
AFS
Air flow sensor
Engine: Gradually increase the speed
Voltage increase in
response to
revving
89
ATS
Intake air temperature
sensor
Ignition switch: "ON" When the intake air
temperature is
−20°C
3.8 − 4.4 V
When the intake air
temperature is 0°C
3.2 − 3.8 V
When the intake air 2.3 − 2.9 V
temperature is 20°C
When the intake air 0.4 − 1.0 V
temperature is 80°C
92
IGN
Ignition switch − IG
Ignition switch: "ON"
System voltage
96
FP/R
Fuel pump relay
Ignition switch: "ON"
System voltage
Engine: Idle operation
1 V or less
97
AFS5
Applied voltage to the
air flow sensor
Ignition switch: "ON"
4.9 − 5.1 V
102
AC/R
A/C compressor relay
• Engine: Idle operation
• A/C switch: "OFF" → "ON"
(when the compressor is active)
System voltage →
1 V or less.
104
BACK
Backup power supply
Ignition switch: "LOCK" (OFF)
System voltage
105
ST
Ignition switch − ST
Engine: Cranking
System voltage
106
STRL
Starter relay
Engine: Cranking
System voltage
Engine: Idle operation
1 V or less
NOTE: *1: The shown voltage is the average value where an analogue voltmeter is used (because a digital
voltmeter may not be able to indicate the average voltage stably).
NOTE: *2: If the battery is fully charged, the output reading may be incorrect.
CHECK CHART FOR RESISTANCE AND
CONTINUITY BETWEEN TERMINALS
1. Turn the ignition switch to "LOCK" (OFF) position.
2. Disconnect the engine-ECU connector.
3. Measure the resistance and check for continuity
between the terminals of the engine-ECU
harness-side connector while referring to the
check chart.
CAUTION
If the terminals that should be checked are mistaken, or if connector terminals are not correctly
shorted to earth, damage may be caused to the
vehicle wiring, sensors, engine-ECU and/or ohm-
NOTE: .
1. When measuring resistance and checking
continuity, a harness for checking contact pin
pressure should be used instead of inserting a
test probe.
2. Checking need not be carried out in the order
given in the chart.
meter. Be careful to prevent this!
4. If the ohmmeter shows any deviation from the
standard value, check the corresponding sensor,
actuator and related electrical wiring, and the
repair or replace.
MULTIPOINT FUEL INJECTION (MPI)
13A-174
TROUBLESHOOTING
5. After repair or replacement, recheck with the
ohmmeter to confirm that the repair or
replacement has corrected the problem.
Engine-ECU Harness Side Connector
82 81 80 79 78 77 76 75 74 73 72 71
16 15 14 13 12 11 10 9 8 7 6 5 4 3
94 93 92 91 90 89 88 87 86 85 84 83
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
106
105 104 103 102 101 100 99 98 97
118
117 116 115 114 113 112 111 110 109 108
96 95
107
2
1
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
AK502911 BA
Terminal No.
Terminal code
Inspection Item
Standard value, normal
condition (Check
condition)
1 − 82
DCV1 − BAT1
Inlet oil feeder control valve
6.9 − 7.9 Ω (at 20°C)
15 − 16
ETV+ − ETV-
Throttle valve control servo
0.3 − 80 Ω (at 20°C)
26 − 27
WTS − WTSE
Engine coolant temperature
sensor
14 − 17 kΩ (at −20°C)
5.1 − 6.5 kΩ (at 0°C)
2.1 − 2.7 kΩ (at 20°C)
0.9 − 1.3 kΩ (at 40°C)
0.48 − 0.68 kΩ (at 60°C)
0.26 − 0.36 kΩ (at 80°C)
34 − 82
OHFL − BAT1
Oxygen sensor (front) heater
4.5 − 8.0 Ω (at 20°C)
35 − 82
OHRL − BAT1
Oxygen sensor (rear) heater
4.5 − 8.0 Ω (at 20°C)
37 − 82
PURG − BAT1
Purge control solenoid valve
22 − 26 Ω (at 20°C)
71 − body earth
RSG − body earth
ECU earth
Continuity (2 Ω or less)
81 − body earth
GNDB − body earth
83 − body earth
RSH − body earth
93 − body earth
GNDE − body earth
88 − 89
AFSE − ATS
Intake air temperature sensor
13 − 18 kΩ (at −20°C)
5.3 − 6.7 kΩ (at 0°C)
2.3 − 3.0 kΩ (at 20°C)
0.30 − 0.45 kΩ (at 80°C)
INSPECTION PROCEDURE USING AN
OSCILLOSCOPE
M1131154503423
The output signals of the sensors and the conditions
of the actuation signals of the actuators can be
inspected visually by observing the waveforms on
the oscilloscope.
MULTIPOINT FUEL INJECTION (MPI)
13A-175
TROUBLESHOOTING
INLET CAMSHAFT POSITION SENSOR
AND CRANK ANGLE SENSOR
Measurement Method
Alternate Method (Measure at the
engine-ECU)
1. Disconnect the engine-ECU connector and
connect the special tool Power plant ECU check
harness (MB992110) in between.
2. Connect the oscilloscope special patterns pickup
to engine-ECU terminal CPI (When checking the
intake camshaft position sensor signal wave
pattern).
3. Connect the oscilloscope special patterns pickup
to engine-ECU terminal SGT (When checking the
crank angle sensor signal wave pattern).
Crank angle sensor
connector
Oscilloscope
1 2 3
CH1
1 2 3
Inlet camshaft
position sensor
connector
CH2
Standard Wave Pattern
AK502608 AK
1. Disconnect the intake camshaft position sensor
connector and insert the special tool test harness
(MB991709) in-between the separated
connectors. (Always mate all the terminals.)
2. Disconnect the crank angle sensor connector and
insert the special tool test harness (MB991709)
in-between the separated connectors.
3. Connect the probe of each channel of the
oscilloscope to terminal No. 3 of the intake
camshaft position sensor connector and terminal
No. 3 of the crank angle sensor connector,
respectively.
Observation condition
Function
Special patterns
Pattern height
Low
Pattern selector
Display
Engine
Idle
Standard wave pattern
(V)
2 engine revolutions (1 camshaft revolution)
No. 1TDC
No. 3TDC
No. 4TDC
No. 2TDC
5
Crank angle sensor
output wave pattern
0
Intake camshaft
position sensor
output ware pattern
5
0
(ms)
AK502609AC
Description of Wave Patterns
• The inlet camshaft position sensor serves as to
detect the compression top dead centre of each
cylinder. By observing this signal simultaneously
with the crank angle sensor signal, it is possible
to identify each cylinder.
MULTIPOINT FUEL INJECTION (MPI)
13A-176
TROUBLESHOOTING
• The crank angle sensor is used to detect the
crank angle of each cylinder. While the engine
revolves for two cycles, 72 pieces of the crank
angle sensor signal (including any missing) will
be outputted.
• The engine ECU carries out the engine control,
using the fall signal (from 5 to 0 V) of the crank
angle sensor. The rise signal (from 0 to 5 V) position does not affect the control.
INJECTOR
Measurement Method
Oscilloscope
Injector
connector
CH1
Wave Pattern Observation Points
• Verify that the sensor signal frequency increases
as the engine speed rises.
Examples of Abnormal Wave Pattern
•
AKC00025 AB
1. Disconnect the injector connector and insert the
special tool Test harness (MB991658) in-between
the separated connectors. (Always mate all the
terminals.)
2. Connect the oscilloscope probe to terminal No. 2
of the injector connector.
Alternate Method (Measure at the
engine-ECU)
AK203243
Example 1
Wave pattern characteristics
Rectangular wave will be outputted while the
engine is not started.
Cause of problem
Failed sensor interface
•
1. Disconnect the engine-ECU connector and
connect the special tool Power plant ECU check
harness (MB992110) in between.
2. Connect the oscilloscope special patterns pickup
to engine-ECU terminal INJ1 (When checking the
No. 1 cylinder).
3. Connect the oscilloscope special patterns pickup
to engine-ECU terminal INJ2 (When checking the
No. 2 cylinder).
4. Connect the oscilloscope special patterns pickup
to engine-ECU terminal INJ3 (When checking the
No. 3 cylinder).
5. Connect the oscilloscope special patterns pickup
to engine-ECU terminal INJ4 (When checking the
No. 4 cylinder).
Standard Wave Pattern
AK203244
Example 2
Wave pattern characteristics
Wave pattern is displaced in the forward or backward direction.
Cause of problem
Loose timing belt
Abnormal sensing section
Observation conditions
Function
Special patterns
Pattern height
Variable
Variable knob
Adjust while viewing the
wave pattern
Pattern selector
Display
Engine
Idle
MULTIPOINT FUEL INJECTION (MPI)
13A-177
TROUBLESHOOTING
Standard wave pattern
(V)
Point A
50
Point B
Injector operation
time
Counter electromotive force
of solenoid coil
Power supply voltage
0
Description of Wave Patterns
• Normally the power supply voltage is shown.
When the engine-ECU outputs the injector drive
signal ON, the voltage falls to approximately 0V
during the period of the signal ON. (See Point B.)
• When the engine-ECU stops the output of the
injector drive signal, the voltage peak appears
due to the counter electromotive force of the coil.
(See Point A.) And then the power supply voltage
returns to its normal value.
• Injector operation time: fuel injection period determined by engine-ECU according to various sensor output values. Injector operation time =
effective injection period + invalid injection period
(invalid injection period: compensation of injector
response delay due to decrease in power supply
voltage)
• Counter electromotive force of solenoid coil: the
counter electromotive force is created in the
injector coil when the engine-ECU stops the output of the injector drive signal.
• Power supply voltage: the power supply voltage
is shown when the engine-ECU stops the output
of the injector drive signal ON. If this supply voltage is low, the injector operation time becomes
longer as the invalid injection time becomes
longer.
Wave Pattern Observation Points
(ms)
AK703483AE
•
When idling
When racing
AK604472AC
Point B: Injector operation time
Operation time
Consistent with the
displayed time on
M.U.T.-III.
Force an excessive
acceleration.
The drive period will
once extend greatly,
then will be settled to
that corresponding to the
engine speed.
IGNITION COIL (POWER TRANSISTOR
CONTROL SIGNAL)
Measurement Method
Ignition coil
connector
Oscilloscope
• Point A: The level of counter electromotive force
of solenoid coil:
Solenoid coil counter
Short-circuit in the
electromotive force is
injector solenoid
low or doesn't appear at
all.
CH1
AKC00026AB
MULTIPOINT FUEL INJECTION (MPI)
13A-178
TROUBLESHOOTING
1. Disconnect the ignition coil connector and insert
the special tool test harness (MB991658)
in-between the separated connectors. (Always
mate all the terminals.)
2. Connect the oscilloscope probe to terminal No. 1
of the ignition coil connector.
3. To verify the ignition advance angle, observe it
simultaneously with the crank angle sensor output
signals.
3. Connect the oscilloscope probe to engine-ECU
terminal CIL2. (When checking the No. 2
cylinder.)
4. Connect the oscilloscope probe to engine-ECU
terminal CIL3. (When checking the No. 3
cylinder.)
5. Connect the oscilloscope probe to engine-ECU
terminal CIL4. (When checking the No. 4
cylinder.)
Alternate Method (Measure at the
engine-ECU)
Standard Wave Pattern
1. Disconnect the engine-ECU connector and
connect the special tool Power plant ECU check
harness (MB992110) in between.
2. Connect the oscilloscope probe to engine-ECU
terminal CIL1. (When checking the No. 1
cylinder.)
Observation condition
Function
Special patterns
Pattern height
Low
Pattern selector
Display
Engine
Idle
Standard wave pattern
(V)
2 engine revolutions (1 camshaft revolution)
TDC
5
Crank angle sensor
output wave pattern
0
Ignition period
5
Power transistor
control signal
wave pattern
(ms)
0
OFF
ON
Dwell section
AK502870AC
Description of Wave Patterns
• Power transistor ON condition:
An interval when the power transistor is ON and the
primary side of ignition coil is conducted (referred
to as "dwell interval") This conduction period gets
longer if the battery voltage is low or vice versa
so that the primary voltage at ignition can be controlled to a constant level.
• Power transistor OFF condition:
This interval corresponds to when the power transistor is OFF and the power transistor drive signal is
not outputted from the engine-ECU.
Wave Pattern Observation Points
• Verify that the power transistor control signal
(ignition timing) advances as the engine speed
increases.
Examples of Abnormal Wave Pattern
Wave pattern characteristics
MULTIPOINT FUEL INJECTION (MPI)
13A-179
ON-VEHICLE SERVICE
Normal wave pattern
Cause of problem
Open-circuit in the ignition primary circuit.
AK203246 AD
The voltage is low.
ON-VEHICLE SERVICE
THROTTLE BODY (THROTTLE VALVE
AREA) CLEANING
M1131001002457
WARNING
When touching the throttle valve, surely shut
off the driving circuits of the throttle valve. In
the event that the throttle valve is operated, a
finger might be injured as the result of being
caught by the throttle valve.
CAUTION
When throttle body is cleaned, use the M.U.T.-III
to initialise the learning value (Refer to GROUP
00 − Precautions Before Service − Initialisation
Procedure for Learning Value in MPI Engine ).
1. Disconnect the electronic-controlled throttle valve
connector.
2. Remove the air intake hose from the throttle body.
3. Remove the throttle body assembly.
CAUTION
Do not spray the cleaning fluid directly to the
throttle valve.
4. Spray the cleaning fluid on a clean cloth.
CAUTION
• Make sure it does not enter the sensor
through the shaft.
• Do not remove molybdenum. which is applied
around the throttle valve of the throttle body.
Areas on throttle valve to
apply molybdenum disulfide
AK502993AC
5. Wipe off the dirt around the throttle valve with the
cloth sprayed with cleaning fluid.
6. Install the throttle body assembly.
7. Install the air intake hose.
8. Connect the electronic-controlled throttle valve
connector.
FUEL PRESSURE TEST
M1131001902999
1. Release residual pressure from the fuel pipe line
to prevent fuel gush out. Reduce pressurized fuel
lines (Refer to P.13A-181).
MULTIPOINT FUEL INJECTION (MPI)
13A-180
ON-VEHICLE SERVICE
CAUTION
Cover the hose connection with rags to prevent
splash of fuel that could be caused by some
residual pressure in the fuel pipe line.
Rocker cover
<Where the fuel pressure gauge is used>
a.
Fuel pressure
gauge set
O-ring or gasket
Delivery pipe
High-pressure
fuel hose
AKA00405 AB
Fuel high pressure hose
AKC00050AB
2. Remove the fuel high-pressure hose at the
delivery pipe.
Install the fuel pressure gauge on the special tool for
measuring the fuel pressure via an appropriate
O-ring or gasket.
<Where the fuel pressure gauge set is used>
a.
MB991981
MB992049
MD998709
MB992001
Gasket
Delivery pipe
High-pressure
fuel hose
MB992076
AKA00404 AB
3. Assemble the special tool called injector test set
(MB992076) as shown in the figure according to
the following procedure.
a. Remove the injector installation adapter from the
hose. Remove another hose together with the
adapter and remove the adopter from the remaining hose.
b. Install the special tool MB992049 (quick connector) and the special tool MB992001 (hose
adapter) to the hose without the adapter.
c. Remove the nipple of the bolt of the special tool
MD998709 (adapter hose).
d. Install the special tool prepared in the procedure
"c" to the nipple that was removed together with
hose in the procedure "a".
4. Install the special tool assembled in Step 3
between the delivery pipe and fuel high-pressure
hose.
AKA00406 AB
Install the special tool fuel pressure gauge set
(MB991981) on the special tool for measuring the
fuel pressure via an appropriate gasket.
b. Connect the leads from the fuel pressure gauge
set to the power supply (cigarette lighter socket)
and special tool vehicle communication interface
(V.C.I.) (MB991824).
CAUTION
Connection and disconnection of M.U.T.-III
should be always performed with the ignition
switch turned to the LOCK (OFF) position.
5. Connect the M.U.T.-III to the diagnosis connector.
6. Turn the ignition switch to the ON position. (But do
not start the engine.)
7. Select "Item No. 9" from the M.U.T.-III actuator
test to drive the fuel pump. Check that there are
no fuel leaks from any parts.
8. Finish the actuator test or turn the ignition switch
to "LOCK" (OFF) position.
9. Start the engine and run at idle.
10.Measure fuel pressure while the engine is running
at idle.
Standard value: Approximately 324 kPa
MULTIPOINT FUEL INJECTION (MPI)
13A-181
ON-VEHICLE SERVICE
11.Check to see that fuel pressure at idle does not
drop even after the engine has been raced
several times.
12.If any of fuel pressure measured in steps 10 and
11 is out of specification, troubleshoot and repair
according to the table below.
Symptom
Probable cause
Remedy
• Fuel pressure is too low.
• Fuel pressure drops after
racing.
Clogged fuel filter
Replace the fuel filter
Fuel pressure is too high.
Fuel leaking to return side due to Replace fuel pressure regulator
poor fuel regulator valve seating or
settled spring.
Low fuel pump delivery pressure
Replace fuel pump
Binding valve in fuel pressure
regulator
Replace fuel pressure regulator
13.Stop the engine and check change of fuel
pressure gauge reading. Normal if the reading
does not drop within 2 minutes. If it does, observe
the rate of drop and troubleshoot and repair
according to the table below.
Symptom
Probable cause
Remedy
Fuel pressure drops gradually
after engine is stopped
Leaky injector
Replace injector
Leaky fuel regulator valve seat
Replace fuel pressure regulator
Fuel pressure drops sharply
immediately after engine is
stopped
Check valve in fuel pump is held
open
Replace fuel pump
14.Release residual pressure from the fuel pipe line.
Reduce pressurized fuel lines (Refer to
P.13A-181).
CAUTION
Cover the hose connection with rags to prevent
splash of fuel that could be caused by some
residual pressure in the fuel pipe line.
15.Remove the fuel pressure gauge and special tool
from the delivery pipe.
16.Install the fuel high-pressure hose over the
delivery pipe.
17.Check for any fuel leaks by following the
procedure in Step 7.
18.Disconnect the M.U.T.-III.
Floor inspection lid (LH)
ACB05828AB
2. Remove the floor inspection lid (LH).
Fuel tank pump and gauge
assembly connector
REDUCE PRESSURIZED FUEL LINES
M1131000902800
When removing the fuel pipes and fuel hoses, follow
the procedure below to release fuel pressure in the
line and prevent fuel from running out, because fuel
pressure in the fuel line is high.
1. Remove the second seat assembly (Refer to
GROUP 52A − Second Seat Assembly ) and turn
up the floor carpet.
AC507336AC
3. Disconnect the fuel tank pump and gauge
assembly connector.
4. Crank the engine for at least two seconds.
5. If the engine does not start, turn the ignition switch
to the "LOCK" (OFF) position.
MULTIPOINT FUEL INJECTION (MPI)
13A-182
ON-VEHICLE SERVICE
6. If the engine is started, turn the ignition switch to
the "LOCK" (OFF) position after the engine
stopped.
7. Connect the fuel tank pump and gauge assembly
connector.
8. Install the floor inspection lid (LH).
9. Return the floor carpet to the original condition
and install the second seat assembly (Refer to
GROUP 52A − Second Seat Assembly ).
Fuel pump and gauge
assembly connector
AC507336AE
FUEL PUMP OPERATION CHECK
M1131002003044
1. Remove the fuel tank cap.
2. Using M.U.T.-III, forcibly drive the fuel pump
(integrated in the fuel pump and gauge assembly)
to check the fuel pump operation.
NOTE: The operating sound of the fuel pump is
difficult to be heard because the pump is in-tank
type. Therefore, remove the fuel filler cap to check
the sound from the fuel filler port.
3. If the fuel pump does not operate, follow the
procedure below to check the pump for operation.
If it is normal, check the driving circuit.
(1) Turn the ignition switch to the "LOCK" (OFF)
position.
(2) Remove the second seat assembly (refer to
GROUP 52A − Second Seat Assembly ) and
turn up the floor carpet.
Floor inspection lid (LH)
ACB05828AB
(3) Remove the floor inspection lid (LH).
(4) Disconnect the fuel pump and gauge
assembly connector.
1 2 3
4 5
Fuel pump and
gauge assembly
connector
AC808654 AC
(5) When the battery is connected to the fuel
pump and gauge assembly connector
terminals No. 4 and 5 (fuel tank pump and
gauge assembly side), check that the pump
operating sound can be heard. When the
pump operating sound cannot be heard,
replace the fuel pump (Refer to GROUP 13B−
On-vehicle Service − Fuel Pump and Gauge
Assembly Replacement ).
NOTE: The operating sound of the fuel pump is
difficult to be heard because the pump is
in-tank type. Therefore, remove the fuel filler
cap to check the sound from the fuel filler port.
(6) Install the fuel tank cap.
(7) Connect the fuel pump and gauge assembly
connector.
(8) Install the floor inspection lid (LH).
(9) Return the floor carpet to the original condition
and install the second seat assembly (Refer to
GROUP 52A − Second Seat Assembly ).
COMPONENT LOCATION
M1131002103870
Name
Symbol
Name
Symbol
Accelerator pedal position sensor
T
ETACS-ECU (fuel pump relay)
Q
A/C compressor relay
P
Ignition coil (with the built-in power
transistor)
C
Injector
B
Air flow sensor (with intake air temperature G
sensor)
MULTIPOINT FUEL INJECTION (MPI)
13A-183
ON-VEHICLE SERVICE
Name
Symbol
Name
Symbol
Crank angle sensor
N
Inlet camshaft position sensor
E
Detonation sensor
L
Inlet oil feeder control valve
I
Diagnosis connector
R
Manifold absolute pressure sensor
J
Electronic-controlled throttle valve (throttle O
position sensor and throttle valve control
servo)
Oxygen sensor (front)
D
Engine control relay
P
Oxygen sensor (rear)
U
Engine coolant temperature sensor
F
Purge control solenoid valve
M
Engine-ECU
H
Starter relay
P
Engine warning lamp
S
Throttle valve control servo relay
P
Engine oil pressure switch
K
A
B
I
Q
R
S
J
C
K
D
L
E
M
F
N
G
O
H
P
T
U
AKC00023AB
MULTIPOINT FUEL INJECTION (MPI)
13A-184
ON-VEHICLE SERVICE
ENGINE CONTROL RELAY CONTINUITY
CHECK
FUEL PUMP RELAY CONTINUITY CHECK
M1131033002100
M1131050002040
Engine control relay
Relay box
ETACS-ECU
AKC00013 AB
ETACS-ECU
1
2
3
2
4
4
Relay equipment
side connector
Connector "A"
1
Connector "C"
3
Connector "B"
Connector "D"
AKC00011AB
Tester
connecti
on
terminal
Battery voltage
Normal
condition
1−3
No voltage
Continuity
2−4
No voltage
No
continuity
Voltage (Connect the
positive (+) terminal of
battery to terminal No. 3
and the negative (−)
terminal of battery to
terminal No. 1.)
Continuity
(2 Ω or less)
Connector "A"
equipment side
connector
Connector "C"
equipment side
connector
Connector "B"
equipment side
connector
Connector "D"
equipment side
connector
Connector "A"
2
ETACSECU
11
Connector "B"
AKC00014AB
Connector "C"
1
Fuel
pump
ON OFF relay
2
Connector "D"
AK701305 AD
MULTIPOINT FUEL INJECTION (MPI)
13A-185
ON-VEHICLE SERVICE
Tester
Battery voltage
connectio
n
terminal
Normal
condition
Connector
"C"
terminal
No. 1 −
Connector
"D"
terminal
No. 2
No
continuity
INTAKE AIR TEMPERATURE SENSOR
CHECK
M1131002802359
No voltage
Voltage (Connect the
Continuity
positive (+) terminal of
(2 Ω or less)
battery to terminal No. 2
of connector "A" and the
negative (−) terminal of
battery to terminal No. 11
of connector "B".)
THROTTLE VALVE CONTROL SERVO
RELAY CONTINUITY CHECK
M1131053501074
Relay box
Air flow sensor
(with built-in intake air
temperature sensor)
Equipment side
connector
AKC00017 AB
1. Disconnect the air flow sensor connector.
2. Measure the resistance between terminal No. 4
and No. 5 of the air flow sensor connector.
Standard value:
13 − 18 kΩ (at −20°C)
5.3 − 6.7 kΩ (at 0°C)
2.3 − 3.0 kΩ (at 20°C)
0.30 − 0.45 kΩ (at 80°C)
3. Remove the air flow sensor.
Throttle valve control
servo relay
1
2
4
3
3
4
2
Intake air temperature sensor
1
AKB00839AB
4. Measure resistance while heating the sensor
using a hair drier.
Normal condition:
Relay equipment
side connector
AKC0012 AB
Tester
connecti
on
terminal
Battery voltage
Normal
condition
1−2
No voltage
Continuity
3−4
No voltage
No
continuity
Voltage (Connect the
positive (+) terminal of
battery to terminal No. 2
and the negative (−)
terminal of battery to
terminal No. 1.)
Continuity
(2 Ω or less)
Temperature (°C)
Resistance (kΩ)
Higher
Smaller
5. If the value deviates from the standard value or
the resistance remains unchanged, replace the air
flow sensor assembly.
6. Install the air flow sensor and tighten it to the
specified torque.
Tightening torque: 1.5 ± 0.3 N⋅m
13A-186
MULTIPOINT FUEL INJECTION (MPI)
ON-VEHICLE SERVICE
ENGINE COOLANT TEMPERATURE
SENSOR CHECK
M1131003102364
1 2
Equipment side
connector
2.1 − 2.7 kΩ (at 20°C)
0.9 − 1.3 kΩ (at 40°C)
0.48 − 0.68 kΩ (at 60°C)
0.26 − 0.36 kΩ (at 80°C)
3. If the resistance deviates from the standard value
greatly, replace the sensor.
Engine coolant
temperature sensor
Radiator upper hose
AKC00018 AB
MB992042
AKX01623AD
4. Apply the sealant over the screw sections on the
engine coolant temperature sensor.
Specified sealant: LOCTITE 262, Three bond
1324N or equivalent
AK503116 AC
1. Remove the engine coolant temperature sensor
using the special tool engine coolant temperature
sensor wrench (MB992042).
5. With the special tool engine coolant temperature
sensor wrench (MB992042) tighten the engine
coolant temperature sensor to the specified
torque.
Tightening torque: 30 ± 9 N⋅m
OXYGEN SENSOR CHECK
M1131005003946
Oxygen sensor (front)
Oxygen sensor
(front) connector
Oxygen sensor (front)
1 2
3 4
AKX01622AD
2. With temperature sensing portion of the engine
coolant temperature sensor immersed in the hot
water, measure the resistance between connector
terminals.
Standard value:
14 − 17 kΩ (at −20°C)
5.1 − 6.5 kΩ (at 0°C)
Equipment side
connector
Exhaust manifold
AKC00015AB
1. Disconnect the oxygen sensor connector and
connect the special tool test harness (MB991658)
to the connector on the oxygen sensor side.
MULTIPOINT FUEL INJECTION (MPI)
13A-187
ON-VEHICLE SERVICE
Oxygen sensor
equipment
side connector
MB991658
AK502625 AC
Oxygen sensor
equipment
side connector
MB991658
AK502626 AC
2. Measure the resistance between terminal No. 1
and No. 3 of the oxygen sensor connector.
Standard value: 4.5 − 8.0 Ω (at 20°C)
3. If the resistance deviates from the standard value,
replace the oxygen sensor.
4. Warm up the engine until the engine coolant
temperature is 80°C or higher.
5. Perform a racing for 5 minutes or more with the
engine speed of 2,000 r/min.
6. Connect the digital voltmeter between terminal
No. 2 and No. 4.
7. While repeatedly racing the engine, measure the
oxygen sensor output voltage.
Standard value:
Engine
When racing
the engine
Oxygen
sensor
output
voltage
Remarks
0.6 − 1.0 V
If you make the
air-fuel ratio rich by
racing the engine
repeatedly, a
normal oxygen
sensor will output a
voltage of 0.6 − 1.0
V.
CAUTION
• Be very careful when connecting the jumper
wire, or incorrect connection can damage the
oxygen sensor.
• Exercise sufficient care so as not to apply
voltage exceeding 8 V onto the oxygen sensor
heater; otherwise the heater may be damaged.
NOTE: If the temperature of sensing area does
not reach the high temperature (of approximately
400°C or more) even though the oxygen sensor is
normal, the output voltage would be possibly low
in spite of the rich air-fuel ratio.
Therefore, if the output voltage is low, use a
jumper wire to connect the terminal No. 1 and No.
3 of the oxygen sensor with the (+) and (−) terminals of 8 V power supply respectively, then check
the voltage again.
8. If the voltage deviates from the standard value,
replace the oxygen sensor.
NOTE: For removal and installation of the oxygen
sensor, refer to GROUP 15 − Exhaust Pipe and
Main Muffler − Removal and Installation .
Oxygen Sensor (rear)
CAUTION
Drive test must be performed, while two persons
are onboard, in a place where a full-throttle accelerating drive can be attempted safely.
Oxygen sensor
(rear) connector
1 2
3 4
Equipment side
connector
Oxygen sensor (rear)
AKC00016 AB
1. Disconnect the oxygen sensor connector and
connect the special tool test harness (MB991658)
to the connector on the oxygen sensor side.
MULTIPOINT FUEL INJECTION (MPI)
13A-188
ON-VEHICLE SERVICE
Oxygen sensor
equipment
side connector
MB991658
AK502625 AC
NOTE: When the vehicle is driven with high loads,
the temperature of the sensing area of the oxygen
sensor is sufficiently high. Thus, it is not necessary to apply the voltage to the heater.
8. If the voltage deviates from the standard value,
replace the oxygen sensor.
NOTE: For removal and installation of the oxygen
sensor, refer to GROUP 15 − Exhaust Pipe and
Main Muffler − Removal and Installation .
INJECTOR CHECK
M1131005202981
CHECK THE OPERATION SOUND
Oxygen sensor
equipment
side connector
CAUTION
Injector
MB991658
1 2
AK502626 AC
2. Measure the resistance between terminal No. 1
and No. 2 of the oxygen sensor connector.
Standard value: 4.5 − 8.0 Ω (at 20°C)
Equipment
side
connector
AKC00021AB
Beware that, even if the injector to be checked is
not operating, the operation sound of other injectors may be heard.
3. If the resistance deviates from the standard value,
replace the oxygen sensor.
4. Warm up the engine until the engine coolant
temperature is 80°C or higher.
5. Drive at 50 km/h or more for 10 minutes.
6. Connect the digital voltmeter between terminal
No. 3 and No. 4.
7. Measure the output voltage of the oxygen sensor
under the following driving.
• Transmission: 2nd
• Drive with wide open throttle
• Engine: 3,500 r/min or more
Standard value:
1. Use a stethoscope to listen to the operation sound
(ticks) from the injectors while the engine is idling
or cranking.
2. Verify that the operation sound increases with the
higher engine speed.
NOTE: If the operating sound cannot be heard,
inspect the injector actuation circuit.
Oxygen sensor output Remarks
voltage
1. Disconnect the injector connector.
2. Measure the resistance between terminals.
Standard value: 10.5 − 13.5 Ω (at 20°C)
0.6 − 1.0 V
High load operation
makes air/fuel ratio
richer and normal
oxygen sensor also can
output voltage of 0.6 −
1.0 V
NOTE: If the temperature of sensing area does
not reach the high temperature (of approximately
400°C or more) even though the oxygen sensor is
normal, the output voltage would be possibly low
in spite of the rich air-fuel ratio.
MEASUREMENT OF RESISTANCE
BETWEEN TERMINALS
3. If the resistance is deviates from the standard
value, replace the injector.
CHECK THE INJECTION CONDITION
1. Release the residual pressure in the fuel pipe line
to prevent the fuel from running out. Reduce
pressurized fuel lines (Refer to P.13A-181).
MULTIPOINT FUEL INJECTION (MPI)
13A-189
ON-VEHICLE SERVICE
CAUTION
Cover the hose connection with rags to prevent
splash of fuel that could be caused by some
residual pressure in the fuel pipe line.
2. Remove the fuel high-pressure hose at the
delivery pipe.
3. Remove the injector.
MB991607
MB992076
AK402080AC
MB992184
MB992088
Injector
AK502628AH
MB992184
MB992088
MB992001
Injector
MB992076
Fuel
high-pressure
hose
AK502629AH
4. Assemble the special tool called injector test set
(MB992076) as shown in the figure according to
the following procedure.
a. Disconnect the injector mounting hose.
b. Remove the adapter for mounting injector and
attach the special tool Injector test nipple
(MB992088) instead.
c. After attaching the injector on the special tool
Injector test nipple (MB992088), secure it with the
special tool injector holder (MB992184).
5. Mount the injector test set (MB992076) prepared
with the special tool hose adapter (MB992001)
onto the fuel high-pressure hose.
6. Connect the M.U.T.-III to the diagnosis connector.
7. Turn the ignition switch to the ON position. (But do
not start the engine.)
8. Select "Item No. 9" of the M.U.T.-III actuator test
to drive the fuel pump.
9. Connect the special tool Injector test harness
(MB991607) between the injector and battery to
drive the injector.
10.Check each injector for spray conditions. The
condition can be considered satisfactory unless it
is extremely poor.
11.Stop the actuation of the injector, and check for
leakage from the injector nozzle.
Standard value: 1 drop or less per minute
12.After turning the ignition switch to the "LOCK"
(OFF) position, remove the M.U.T.-III.
13.Actuate the injector until it does not spray fuel any
longer, then drain the fuel inside the special tool.
14.Remove the special tool.
15.When the spray condition is extremely poor or
any fuel leaks from the injector nozzle, replace the
injector.
16.Replace the injector and fuel high-pressure hose
in the original places.
THROTTLE VALVE CONTROL SERVO
CHECK
M1131051001631
OPERATION CHECK
WARNING
When checking the throttle valve operation,
never insert fingers into the throttle valve.
The extremely strong power of the throttle
valve motor might trap and injure fingers.
1. Remove the air intake hose from the throttle body
assembly.
2. Turn the ignition switch to the ON position.
3. Verify that the throttle valve opens or closes
according to the accelerator pedal operated.
13A-190
MULTIPOINT FUEL INJECTION (MPI)
ON-VEHICLE SERVICE
CHECK THE COIL RESISTANCE
WARNING
When touching the throttle valve, surely shut
off the driving circuits of the throttle valve. In
the event that the throttle valve is operated, a
finger might be injured as the result of being
caught by the throttle valve.
3. If the resistance deviates from the standard value,
replace the throttle body assembly.
OIL FEEDER CONTROL VALVE CHECK
M1131053800458
OPERATION CHECK
1 2
Equipment side
connector
1 2 3 4 5 6
Equipment side connector
Inlet oil feeder
control valve
Electronic-controlled
throttle valve
AKC00019
1. Disconnect the electronic-controlled throttle valve
connector.
2. Measure the resistance between terminal No. 1
and No. 2 of the electronic-controlled throttle
valve connector.
Standard value: 0.3 − 80 Ω (at 20°C)
NOTE: If the measured resistance deviates from the
standard value, fully open the throttle valve with your
finger more than five times, then check the result
again.
If the throttle valve control serve is not used for an
extended period of time, the resistance may be
increased as a result of internal forming of oxide film.
Therefore, it means that the oxide film can be
removed through a self cleaning capability of the
throttle valve control servo, if forcibly moved.
Inlet manifold
AKC00020 AB
1. Disconnect the inlet oil feeder control valve
connector.
CAUTION
To prevent the coil from burning, keep the duration of the voltage application as short as possible.
2. Make sure that the inlet oil feeder control valve
generates a tick sound when the battery voltage is
applied between the connector terminals at the
inlet oil feeder control valve side.
RESISTANCE BETWEEN TERMINALS
1. Disconnect the inlet oil feeder control valve
connector.
2. Measure the resistance between the terminals of
the connector at the inlet oil feeder control valve.
Standard value: 6.9 − 7.9 Ω (at 20°C)
3. If the resistance deviates from the standard value,
replace inlet oil feeder control valve.
MULTIPOINT FUEL INJECTION (MPI)
13A-191
INJECTOR
INJECTOR
REMOVAL AND INSTALLATION
M1131007104191
CAUTION
When the fuel injector is replaced, initialise the learned value using M.U.T.-III (Refer to GROUP 00 −
Precautions before Service, Initialisation Procedure for Learning Value in MPI Engine ).
Pre-removal operation
• Fuel Line Pressure Reduction (Refer to P.13A-181).
• Engine Upper Cover Removal (Refer to GROUP 11A −
Camshaft ).
• Air Cleaner Intake Hose Removal (Refer to GROUP 15 −
Air Cleaner ).
Apply new engine oil
to the O-ring before
installation.
Post-installation operation
• Air Cleaner Intake Hose Installation (Refer to GROUP 15
− Air Cleaner ).
• Fuel Leak Check.
• Engine Upper Cover Installation (Refer to GROUP 11A −
Camshaft ).
3.5 ± 1.5 N·m
20 ± 2 N·m
4
3.5 ± 1.5 N·m
20 ± 2 N·m
1
2
5
12
10 N
11
7
9 N
<<A>>
>>F<<
<<B>>
>>E<<
>>E<<
>>E<<
>>D<<
>>C<<
>>B<<
>>A<<
Removal steps
1. Control wiring harness connection
2. Fuel high-pressure hose
connection
3. Engine oil level gauge
4. Injector protector rear
5. Bracket
6. Fuel delivery pipe and fuel injector
assembly
7. Fuel injector support
8. Fuel injector assembly
9. O-ring
10. O-ring
11. Fuel injector
12. Fuel delivery pipe
6
8
3
ACB05829 AB
REMOVAL SERVICE POINTS
<<A>> FUEL HIGH-PRESSURE HOSE
DISCONNECTION
Fuel high-pressure
hose
Retainer
Fuel delivery
pipe
ACC00112AB
1. Follow the steps below to unlock the fuel
high-pressure hose connector.
MULTIPOINT FUEL INJECTION (MPI)
13A-192
INJECTOR
Flat-tipped
screwdriver
INSTALLATION SERVICE POINTS
>>A<< O-RING INSTALLATION
Retainer
Fuel injector
O-ring
Fuel delivery
pipe
Fuel high-pressure
hose
ACC00113AB
(1) Insert a flat-tipped screwdriver (6 mm wide
and 1 mm thick) into the retainer of the fuel
high-pressure hose connector.
CAUTION
When pushing up the retainer of the fuel
high-pressure hose connector, pay attention to
avoid damage to the retainer.
Flat-tipped
screwdriver
Retainer
Fuel delivery
pipe
(Engine oil)
AC506791AB
1. Apply a small amount of new engine oil to the
O-ring.
2. While turning the fuel injector to right and left,
install the O-ring to the fuel injector with care to
avoid damage to the O-ring.
>>B<< O-RING INSTALLATION
1. Apply a small amount of new engine oil to the
O-ring.
Fuel high-pressure
hose
ACC00114AB
(2) Turn the flat-tipped screwdriver inserted into
the retainer by 90° to push up the retainer and
unlock the fuel high-pressure hose connector.
2. Remove the fuel high-pressure hose.
Fuel injector
MB992106
AC506792AB
<<B>> FUEL DELIVERY PIPE AND FUEL
INJECTOR ASSEMBLY REMOVAL
CAUTION
Do not drop the fuel injector.
Remove the fuel delivery pipe with the fuel injectors
attached to it.
2. Using special tool O-ring installer (MB992106),
install the fuel injector paying attention to avoid
damage to the O-ring.
>>C<< FUEL INJECTOR ASSEMBLY
INSTALLATION
CAUTION
When applying the engine oil, make sure not to
allow the engine oil to enter the fuel delivery pipe
inside.
1. Apply a small amount of new engine oil to the
O-ring.
MULTIPOINT FUEL INJECTION (MPI)
13A-193
INJECTOR
Fuel injector
CAUTION
When installing the fuel delivery pipe and fuel
injector assembly to the inlet manifold, pay attention to avoid damage to the O-ring at the end of
the fuel injector assembly.
2. Install the fuel delivery pipe and fuel injector
assembly to the inlet manifold.
3. Install the bracket and injector protector rear.
Projection
AC506793AB
2. Turning the fuel injector assembly to right and left,
install it to the fuel delivery pipe with care not to
damage the O-ring. After the installation, check
for its smooth rotation. At this time, check that the
projection part of the fuel injector assembly is in
the centre.
3. If the rotation is not smooth, the O-ring may be
caught. Remove the fuel injector assembly and
check the O-ring for damage. After this, re-insert it
to the fuel delivery pipe and check for its smooth
rotation.
>>D<< FUEL INJECTOR SUPPORT
INSTALLATION
Fuel delivery
pipe brim
Fuel injector
support
Fuel injector
groove
AC312109AC
Install the fuel injector support to the fuel injector
groove and fuel delivery pipe brim, and fix the fuel
injector assembly and fuel delivery pipe.
>>E<< FUEL DELIVERY PIPE AND FUEL
INJECTOR
ASSEMBLY/BRACKET/INJECTOR
PROTECTOR REAR INSTALLATION
CAUTION
When applying the engine oil, make sure not to
allow the engine oil to enter the inlet manifold
inside.
1. Apply a small amount of new engine oil to the
O-ring at the end of fuel injector assembly.
6
8
7
5
4
9
3
2
1
11
10
ACB05830AB
4. Loosen the inlet manifold mounting bolts and nuts
(Bolts and nuts 1, 2, 3 and 9 shown in the figure).
5. Loosen the inlet manifold stay mounting bolts
(Refer to GROUP 15 − Inlet Manifold ).
6. Temporarily tighten the mounting bolts and nuts of
the inlet manifold, bracket, fuel delivery pipe and
injector protector rear to the specified torque in
the order of number shown in the figure.
Tightening torque: 3.5 ± 1.5 N⋅m
7. Tighten the mounting bolts of the fuel delivery
pipe, and the mounting bolts and nuts of the
bracket, injector protector rear and inlet manifold
to the specified torque in the order of number
shown in the figure.
Tightening torque: 20 ± 2 N⋅m
8. Tighten the inlet manifold stay mounting bolts to
the specified torque (Refer to GROUP 15 − Inlet
Manifold ).
Tightening torque: 20 ± 2 N⋅m
MULTIPOINT FUEL INJECTION (MPI)
13A-194
INJECTOR
>>F<< FUEL HIGH-PRESSURE HOSE
CONNECTION
Retainer
Fuel high-pressure
hose
Retainer
Fuel delivery pipe
ACC00055AB
Fuel high-pressure hose
ACC00373 AB
1. Pull up the retainer of fuel high-pressure hose to
unlock before installing.
2. Install the fuel high-pressure hose to the fuel
delivery pipe.
CAUTION
• When pushing in the retainer of the fuel
high-pressure hose connector, pay attention
to avoid damage to the retainer.
• After the installation of the fuel high-pressure
hose, slightly pull the fuel high-pressure hose
to check that it is connected securely. At this
time, also check that there is approximately 1
mm play.
3. Push in the retainer of the fuel high-pressure hose
connector to lock the fuel high-pressure hose and
fuel delivery pipe.
MULTIPOINT FUEL INJECTION (MPI)
13A-195
THROTTLE BODY ASSEMBLY
THROTTLE BODY ASSEMBLY
REMOVAL AND INSTALLATION
M1131007703264
CAUTION
• When the throttle body assembly is replaced, initialise the learned value using M.U.T.-III (Refer to
GROUP 00 − Precautions before Service, Initialisation Procedure for Learning Value in MPI Engine
).
• Never loosen the screw fixing the throttle body assembly resin cover. If the screw is loosened, the
sensor incorporated in the resin cover is misaligned and the throttle body assembly does not
work normally.
Pre-removal operation
• Engine Upper Cover Removal (Refer to GROUP 11A −
Camshaft ).
• Engine Coolant Draining (Refer to GROUP 14 − On-vehicle Service, Engine Coolant Replacement ).
• Air Cleaner Intake Hose Removal (Refer to GROUP 15 −
Air Cleaner ).
Post-installation operation
• Air Cleaner Intake Hose Installation (Refer to GROUP 15
− Air Cleaner ).
• Engine Coolant Refilling (Refer to GROUP 14 − On-vehicle Service, Engine Coolant Replacement ).
• Engine Upper Cover Installation (Refer to GROUP 11A −
Camshaft ).
9.5 ± 2.5 N·m
8
3
6
7
9.5 ± 2.5 N·m
2
N
9
4
1
5
ACB05831AB
>>B<<
•
1.
2.
3.
4.
Removal steps
Initialisation operation <only at
installation>
Electronic control throttle valve
connector connection
Control wiring harness clip
connection
Battery cable clip connection
Throttle body water feed hose
connection
5.
6.
7.
>>A<<
8.
9.
Removal steps (Continued)
Throttle body water return hose
connection
Throttle body stay
Throttle body wiring harness
connector bracket
Throttle body assembly
Throttle body gasket
13A-196
MULTIPOINT FUEL INJECTION (MPI)
THROTTLE BODY ASSEMBLY
INSTALLATION SERVICE POINTS
>>A<< THROTTLE BODY GASKET
INSTALLATION
Fit the throttle body gasket in the inlet manifold
groove securely with neither twisting nor damage
given.
>>B<< INITIALISATION OPERATION
Turn the ignition switch to the "ON" position and then
to "LOCK" (OFF) position and hold it for at least 10
seconds.
Inlet manifold
Throttle body
gasket
AC506797AB
MULTIPOINT FUEL INJECTION (MPI)
13A-197
ENGINE-ECU
ENGINE-ECU
REMOVAL AND INSTALLATION
M1131033802258
CAUTION
• If the engine-ECU is replaced, another ECU related to KOS system should not be replaced
together. If at least two ECUs needs to be replaced, replace one ECU and then register its ID with
M.U.T.-III. Then proceed to the replacement of the other ECU.
• If the engine-ECU is replaced, perform the coding for it.
• If the engine-ECU is replaced, use M.U.T.-III to write the Chassis No. (Refer to GROUP 00 − How to
Perform Chassis Number Writing ).
• After the engine-ECU replacement, idling speed may be unstable because the MPI engine learning
is not completed. To make it stable, let the system learn the idling (Refer to GROUP 00 − Precautions before Service, Learning Procedure for Idling in MPI Engine ).
Pre-removal and post-installation operation
• Air Cleaner Assembly Removal and Installation (Refer to
GROUP 15 − Air Cleaner ) .
5.0 ± 2.0 N·m
5.0 ± 2.0 N·m
2
1
12 ± 5 N·m
4
5
3
ACB05832 AB
>>A<<
•
1.
2.
3.
4.
5.
Removal steps
Initialisation operation <only at
installation>
Engine-ECU connector
connection
Engine-ECU stay
Engine-ECU and engine-ECU
bracket
Engine-ECU bracket
Engine-ECU
INSTALLATION SERVICE POINTS
>>A<< INITIALISATION OPERATION
Turn the ignition switch to the "ON" position and then
to "LOCK" (OFF) position and hold it for at least 10
seconds.
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