35C - Система динамической стабилизации (ASC)

35C - Система динамической стабилизации (ASC)
35C-1
GROUP 35C
ACTIVE STABILITY
CONTROL SYSTEM
(ASC)
CONTENTS
SERVICE SPECIFICATIONS. . . . . . .
35C-4
SPECIAL TOOL . . . . . . . . . . . . . . . . .
35C-4
TROUBLESHOOTING . . . . . . . . . . . .
35C-6
DIAGNOSIS TROUBLESHOOTING FLOW
35C-6
PRECAUTIONS FOR DIAGNOSIS. . . . . . .
35C-6
ABS WARNING LAMP, ASC WARNING/OPERATION
LAMP AND BRAKE WARNING LAMP CHECK
......................................
35C-6
DIAGNOSTIC FUNCTION . . . . . . . . . . . . .
35C-7
DIAGNOSIS CODE CHART . . . . . . . . . . . .
35C-15
DIAGNOSIS CODE PROCEDURES . . . . .
35C-18
Code No. C100A FL wheel speed sensor circuit
Code No. C1015 FR wheel speed sensor circuit
Code No. C1020 RL wheel speed sensor circuit
Code No. C102B RR wheel speed sensor circuit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-18
Code No. C1011 FL wheel speed sensor signal
Code No. C101C FR wheel speed sensor signal
Code No. C1027 RL wheel speed sensor signal
Code No. C1032 RR wheel speed sensor signal
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-21
Code No. C1014 FL wheel speed sensor performance
Code No. C101F FR wheel speed sensor performance
Code No. C102A RL wheel speed sensor performance
Code No. C1035 RR wheel speed sensor performance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-24
Code No. C1041 FL wheel speed tone performance
Code No. C1042 FR wheel speed tone performance
Code No. C1043 RL wheel speed tone performance
Code No. C1044 RR wheel speed tone performance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-27
Code No. C1046 FL wheel speed sensor phase
Code No. C1047 FR wheel speed sensor phase
Code No. C1048 RL wheel speed sensor phase
Code No. C1049 RR wheel speed sensor phase
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-29
Code No. C104B FL inlet valve
Code No. C104F FR inlet valve
Code No. C1053 RL inlet valve
Code No. C1057 RR inlet valve
Code No. C105F FL outlet valve
Code No. C1063 FR outlet valve
Code No. C1067 RL outlet valve
Code No. C105B RR outlet valve
Code No. C1200 FL-RR cut valve
Code No. C1204 FR-RL cut valve
Code No. C1208 FL-RR suction valve
Code No. C120C FR-RL suction valve . . . .
35C-32
Code No. C2104 Valve power supply circuit
35C-33
Code No. C1073 Motor drive circuit . . . . . .
35C-35
Code No. C2116 Pump motor voltage low .
35C-37
Code No. C121D Brake fluid pressure sensor circuit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-38
Code No. C121E Brake fluid pressure sensor
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-39
Code No. C1000 Brake SW (stuck) . . . . . . .
35C-41
Code No.C123B: System control too long . .
35C-42
Code No. C2200 ECU internal error . . . . . .
35C-43
Code No. C2101 Power supply high voltage
......................................
35C-44
Code No. C1395 Incomplete Brake fluid filling
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-45
Code No. C121C Torque request signal denied
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-45
Code No.C2206 Re-execution of variant coding
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-46
35C-2
Code No. C1210 Longitudinal G sensor input circuit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-47
pressed for 3 seconds or more to turn the system OFF.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-75
Code No. C1242 Longitudinal G sensor signal
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-48
Inspection Procedure 10: Abnormality in brake
operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-75
Code No. C123C Sensor cluster malfunction
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-49
Inspection Procedure 11: ASC does not operate or
faulty ASC operate. . . . . . . . . . . . . . . . . . . . 35C-76
Code No. C1392 Incomplete learn (Longitudinal G)
Code No. C1393 Incomplete learn neutral(Lateral G)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-51
Inspection Procedure 12: ASC-ECU power supply
circuit system. . . . . . . . . . . . . . . . . . . . . . . . 35C-77
Code No. C2204 Sensor cluster internal error
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-52
Code No. C1219 Steering angle sensor signal
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-53
Code No. C121A SAS initialization . . . . . . .
35C-55
Code No. C2205: SAS internal error. . . . . .
35C-56
Code No.C2002: Valve calibration not completed
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-56
Inspection Procedure 13: Steering wheel sensor power
supply circuit system . . . . . . . . . . . . . . . . . . 35C-79
Inspection Procedure 14: ABS/stability control/TCL
operates too frequently. . . . . . . . . . . . . . . . . 35C-80
Inspection Procedure 15: HSA (Hill Start Assist) does
not work. . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-82
Inspection Procedure 16: HSA (Hill Start Assist) works
on a flat road.. . . . . . . . . . . . . . . . . . . . . . . . 35C-84
Code No. C1608 EEPROM fail . . . . . . . . . .
35C-57
Inspection Procedure 17: The initial check sound of
hydraulic unit is loud. . . . . . . . . . . . . . . . . . . 35C-84
Code No.C1707: Implausible coding data. .
35C-59
DATA LIST REFERENCE TABLE . . . . . . . .
35C-85
ACTUATOR TEST TABLE . . . . . . . . . . . . .
35C-87
CHECK AT ECU TERMINALS . . . . . . . . . .
35C-88
Code No. U0100 Engine CAN timeout
Code No. U0101 T/M CAN timeout
Code No. U0114 4WD CAN timeout
Code No. U0126 SAS CAN timeout
Code No. U0141 ETACS CAN timeout . . . .
35C-60
Code No. U0401 Engine (CAN message). .
35C-61
Code No. U0428 SAS (CAN message). . . .
35C-62
Code No. U1073 Bus-off . . . . . . . . . . . . . . .
35C-63
Code No. U1195 Coding not completed
Code No. U1197 Coding data unavailable .
35C-64
TROUBLE SYMPTOM CHART. . . . . . . . . .
35C-65
SYMPTOM PROCEDURES . . . . . . . . . . . .
35C-66
ALL SENSOR CALIBRATION (G AND YAW RATE
SENSOR, STEERING WHEEL SENSOR, BRAKE
FLUID PRESSURE SENSOR) . . . . . . . . . . 35C-93
Inspection Procedure 1: M.U.T.-III communication with
ABS/ASC system is impossible. . . . . . . . . . 35C-66
G AND YAW RATE SENSOR CALIBRATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-93
Inspection Procedure 2: ASC OFF lamp flashes at a
rate of 2Hz. . . . . . . . . . . . . . . . . . . . . . . . . . 35C-66
STEERING WHEEL SENSOR CALIBRATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-94
Inspection Procedure 3: Brake warning lamp stays ON
with the parking brake lever released (ABS warning
lamp is OFF). . . . . . . . . . . . . . . . . . . . . . . . 35C-67
BRAKE FLUID PRESSURE SENSOR CALIBRATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-94
Inspection Procedure 4: ABS warning lamp does not
illuminate when ignition switch is turned to the ON
position (engine stopped).. . . . . . . . . . . . . . 35C-69
ASC OFF SWITCH . . . . . . . . . . . . . . . 35C-95
Inspection Procedure 5: Brake warning lamp does not
illuminate when the ignition switch is turned to ON
position (engine stopped).. . . . . . . . . . . . . . 35C-70
Inspection Procedure 6: ABS warning lamp stays ON
after the engine is started.. . . . . . . . . . . . . . 35C-71
Inspection Procedure 7: ASC warning lamp stays ON
after the engine is started.. . . . . . . . . . . . . . 35C-72
Inspection Procedure 8: ASC OFF lamp stays ON after
the engine is started.. . . . . . . . . . . . . . . . . . 35C-73
Inspection Procedure 9: The stability control/TCL
system cannot be disabled when ASC OFF switch is
ON-VEHICLE SERVICE . . . . . . . . . . . 35C-90
WHEEL SPEED SENSOR OUTPUT CURRENT
MEASUREMENT. . . . . . . . . . . . . . . . . . . . . 35C-90
HYDRAULIC UNIT (HU) CHECK . . . . . . . .
35C-90
MEASURES FOR DISCHARGED BATTERY
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-93
REMOVAL AND INSTALLATION . . . . . . . .
35C-95
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
35C-95
HYDRAULIC UNIT . . . . . . . . . . . . . . . 35C-95
REMOVAL AND INSTALLATION . . . . . . . .
35C-95
WHEEL SPEED SENSOR . . . . . . . . . 35C-97
REMOVAL AND INSTALLATION <FRONT>
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35C-97
REMOVAL AND INSTALLATION <REAR>.
35C-97
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
35C-97
35C-3
STEERING WHEEL SENSOR . . . . . .
35C-98
REMOVAL AND INSTALLATION . . . . . . . .
35C-98
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-4
SERVICE SPECIFICATIONS
SERVICE SPECIFICATIONS
M1355008200089
Item
Standard value
Wheel speed sensor current mA
5.9 − 8.4 or 11.8 − 16.8
Wheel speed sensor insulation resistance MΩ
5 or more
SPECIAL TOOL
M1355005800372
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
ASC check (Diagnosis
code display, data list
display and calibration by
M.U.T.-III)
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-5
SPECIAL TOOL
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. M.U.T.-III 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. M.U.T.-III
measurement adapter
f. M.U.T.-III trigger
harness
CAUTION
For vehicles with CAN
communication, use
M.U.T.-III main harness
A to send the simulated
vehicle speed. If you
connect M.U.T.-III main
harness B instead, CAN
communication does
not function correctly.
ASC check (Diagnosis
code display, data list
display and calibration by
M.U.T.-III)
MB992006
Extra fine probe
Continuity check and
voltage measurement at
wiring harness or
connector
MB991709
Wiring harness set
Checking the ASC-ECU
and output current
measure at the wheel
speed sensor
MB991827
c
MB991910
d
DO NOT USE
MB991911
e
MB991825
f
MB991826
MB991955
MB992006
35C-6
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
TROUBLESHOOTING
DIAGNOSIS TROUBLESHOOTING FLOW
PRECAUTIONS FOR DIAGNOSIS
M1355000900114
Refer to GROUP 00 − How to Use Troubleshooting/Inspection Service Points .
M1355009500102
1. ASC controls brake pressure by the assistance of
ECU. The symptoms described in the chart below
may occur during the normal ASC operation, and
they do not indicate any sign of malfunction.
Symptoms
Description of symptoms
• When the ASC operates, the operating noise is generated
from the motor. (Squeak noise)
• Noise is generated from the brake pedal together with the
vibration. (Gride noise)
• When ABS operates, the system repeats the activation and
deactivation. At this time, the noise is generated from the
chassis components. (Clonk: Suspension, Squeaky: Tyres)
These noises are generated when the
system and brake pedal operate
normally, and they do not indicate any
sign of malfunction.
• A slight shock may be felt when depressing the brake pedal
lightly during the low speed driving.
• Small clicking noise may be heard from the engine
compartment.
This noise is generated when the system
operation check (startup check
performed at the vehicle speed which is a
few km/h higher than the predetermined
vehicle speed) is performed, and it does
not indicate malfunction.
2. On the snowy or gravelled roads, a vehicle with
ABS would have longer braking distance
compared to the one without ABS. Considering
this characteristics, advise the customer to drive
the vehicle safely at lower speed and not to put
too much confidence in the ABS system when
driving on the above-mentioned roads.
3. The diagnosis code detection condition depends
on each diagnosis code. When the trouble
symptoms are rechecked, conditions described in
the description for the diagnosis code procedures
should be met.
ABS WARNING LAMP, ASC
WARNING/OPERATION LAMP AND
BRAKE WARNING LAMP CHECK
M1352012001327
Check that ABS and brake warning lamps, ASC
warning/operation lamp illuminate as follows.
NOTE: The brake warning lamp is used as a warning
lamp for parking brake, brake fluid level, and EBD
control.
ASC warning/
operation lamp
ASC OFF lamp
Brake warning lamp
ABS warning lamp
Approximately 3s
ABS warning
lamp, Brake
Illuminated
warning lamp,
ASC warning/
Not
operation lamp,
illuminated
ASC OFF lamp
START
Ignition switch
ON
ACC,
LOCK
ACC00034AB
1. When the ignition switch is turned to the ON
position, ABS and brake warning lamps, ASC
warning/operation lamp, ASC OFF lamp
illuminate.
2. The ABS and brake warning lamps, ASC
warning/operation lamp, ASC OFF lamp
illuminate for three seconds*1 and then turn
OFF*2.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-7
TROUBLESHOOTING
3. Otherwise, check the diagnosis code.
NOTE: .
• *1: The ABS warning lamp, ASC warning/operation lamp, ASC OFF lamp may stay ON until the
vehicle speed reaches 10 km/h. As far as
ASC-ECU stores any diagnosis code related to
the wheel speed sensor malfunction or the motor
malfunction as past trouble, ASC-ECU continues
illuminating the ABS warning lamp until it verifies
that the malfunction for that code is resolved
(startup check).
If the steering wheel sensor or the G and yaw rate
sensor system was detected to be defective during ignition switch being ON at the last time, the
ASC warning/operation lamp and the ASC OFF
lamp will illuminate until the vehicle speed
reaches approx. 10 km/h, then the steering
wheel is turned to either right or left and then the
ECU determines that the system is normal.
• *2: The brake warning lamp does not turn OFF
when the parking brake is applied or the brake
fluid level is lowered.
DIAGNOSTIC FUNCTION
M1355001000880
ASC-ECU has the following functions for easier system checks.
• Diagnosis code set (Refer to P.35C-15).
• Service data output (Refer to P.35C-85).
• Actuator test (Refer to P.35C-87).
• Freeze frame data output (Refer to ).
All the above items can be diagnosed using
M.U.T.-III.
CHECK OF FREEZE FRAME DATA
The freeze frame data can be checked by using the
M.U.T.-III.
Display item list
Item No.
Item name
When detecting fault and storing the diagnosis code,
the ECU connected to CAN bus line obtains the data
before the determination of the diagnosis code and
the data when the diagnosis code is determined, and
then stores the ECU status of that time. By analysing
each data from M.U.T.-III, the troubleshooting can be
performed more efficiently. The displayed items are
as the table below.
Data item
Unit
km
1
Odometer
Total driving distance after the diagnosis code is
generated
2
Ignition cycle
Number of times the ignition switch is turned "ON" or Number of
"LOCK (OFF)" after the past failure transition
counts is
displayed.
5
Power supply
voltage
Voltage of power supply when the diagnosis code is V
generated
8
Lateral G sensor
Lateral G of G and yaw rate sensor when the
diagnosis code is generated
G
9
G sensor
Longitudinal G of G and yaw rate sensor when the
diagnosis code is generated
G
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-8
TROUBLESHOOTING
Item No.
Item name
Data item
Unit
10
Master cylinder
pressure
Master cylinder pressure of Master cylinder pressure bar
sensor when the diagnosis code is generated
11
Steering angle
Steering angle of steering wheel sensor when the
diagnosis code is generated
deg
12
Yaw rate sensor
Yaw rate of G and yaw rate sensor when the
diagnosis code is generated
deg/s
13
Stop lamp switch
Stop lamp switch condition when the diagnosis code −
is generated: OFF/ON
21
Pump motor
Pump motor condition when the diagnosis code is
generated: OFF/ON
28
ASC/TCL off switch
ASC OFF switch condition when the diagnosis code −
is generated: OFF/ON
301
ABS control
ABS control when the diagnosis code is generated:
OFF/ON
−
302
Brake TCL control
Traction control operation status (brake control)
when the diagnosis code is generated: OFF/ON
−
303
Engine TCL control
Traction control operation status (engine control)
when the diagnosis code is generated: OFF/ON
−
304
ASC control
ASC control when the diagnosis code is generated: −
OFF/ON
305
Brake TCL operation Traction control operation status (brake control)
status when the diagnosis code is generated:
Permission/Prohibition
−
306
Brake assist control
Brake assist control when the diagnosis code is
generated: OFF/ON
−
401
FL wheel speed
sensor
Wheel speed (FL) when the diagnosis code is
generated
km/h
402
FR wheel speed
sensor
Wheel speed (FR) when the diagnosis code is
generated
km/h
403
RL wheel speed
sensor
Wheel speed (RL) when the diagnosis code is
generated
km/h
404
RR wheel speed
sensor
Wheel speed (RR) when the diagnosis code is
generated
km/h
−
FAIL-SAFE FUNCTIONS
• When a malfunction is determined by the diagnostic function, ASC-ECU illuminates the brake
warning lamp, brake warning display, ABS warning lamp, ABS warning display, ASC warning
lamp, ASC warning display, and ASC OFF lamp.
At the same time, ASC-ECU prohibits the EBD,
ABS, stability control, TCL, brake assist, and
HSA.
NOTE: The brake warning lamp and brake warning
display are used as the EBD control warning
lamp.
• When the brake pad temperature (assumed)
exceeds the specified value, the ASC OFF lamp
flashes (2 Hz).
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-9
TROUBLESHOOTING
Illumination condition of warning lamp and display in case of failure
Diagnosis Item
code No.
Brake
warning
lamp,
brake
warning
display
ABS warning
lamp,
ABS warning
display
ASC warning ASC OFF
lamp
lamp
ASC warning
display
C100A
FL wheel speed sensor circuit
OFF*1
ON
ON
ON
C1015
FR wheel speed sensor circuit
C1020
RL wheel speed sensor circuit
C102B
RR wheel speed sensor circuit
C1011
FL wheel speed sensor signal
OFF*1
ON *2
ON*2
ON*2
C101C
FR wheel speed sensor signal
C1027
RL wheel speed sensor signal
C1032
RR wheel speed sensor signal
C1014
FL wheel speed sensor
performance
OFF*1
ON *2
ON*2
ON*2
C101F
FR wheel speed sensor
performance
C102A
RL wheel speed sensor
performance
C1035
RR wheel speed sensor
performance
C1041
FL wheel speed tone
performance
OFF*1
ON *2
ON*2
ON*2
C1042
FR wheel speed tone
performance
C1043
RL wheel speed tone
performance
C1044
RR wheel speed tone
performance
C1046
FL wheel speed sensor phase
OFF*1
ON *2
ON*2
ON*2
C1047
FR wheel speed sensor phase
C1048
RL wheel speed sensor phase
C1049
RR wheel speed sensor phase
C104B
FL inlet valve
ON
ON
ON
ON
C104F
FR inlet valve
C1053
RL inlet valve
C1057
RR inlet valve
C105F
FL outlet valve
ON
ON
ON
ON
C1063
FR outlet valve
C1067
RL outlet valve
C105B
RR outlet valve
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-10
TROUBLESHOOTING
Diagnosis Item
code No.
Brake
warning
lamp,
brake
warning
display
ABS warning
lamp,
ABS warning
display
ASC warning ASC OFF
lamp
lamp
ASC warning
display
C1200
FL-RR cut valve
ON
ON
ON
ON
C1204
FR-RL cut valve
C1208
FL-RR suction valve
C120C
FR-RL suction valve
C2104
Valve power supply circuit
ON
ON
ON
ON
C1073
Motor drive circuit
OFF
ON *2
ON*2
ON*2
C2116
Pump motor voltage low
OFF
ON *2
ON*2
ON*2
C121D
Brake fluid
pressure
sensor circuit
Only the
OFF
hydraulic brake
assist system is
defective.
OFF
ON
OFF
Other than
above
OFF
ON
ON
ON
C121E
Brake fluid pressure sensor
OFF
ON
ON
ON
C1000
Brake SW (stuck)
OFF
OFF
ON
ON
C123B
System control too long
OFF
OFF
ON*8
ON*8
C2200
ECU internal error
ON*5
ON*6
ON
ON
C2101
Power supply
high voltage
ON
ON
ON
ON
C1395
Incomplete Brake fluid filling
OFF
ABS warning OFF
lamp:
Flashing (2
Hz)
ABS warning
display:
ON
OFF
C121C
Torque request signal rejection
OFF
OFF
ON
ON
C2206
Re-execution of variant coding
OFF
ON
ON
ON
C1210
Longitudinal G Abnormality in
sensor input
longitudinal
circuit
G-sensor
output voltage
OFF
OFF*3, ON*4
ON
OFF*3, ON*4
C1242
Longitudinal G Abnormality in
sensor signal longitudinal
G-sensor
output signal
OFF
OFF*3, ON*2*4 ON*2
OFF*3, ON*2*4
C123C
Sensor cluster Abnormality in OFF
malfunction
lateral G & yaw
rate output
value
OFF
ON*8
18.0 ± 1.0 V or
more
ON*8
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-11
TROUBLESHOOTING
Diagnosis Item
code No.
Brake
warning
lamp,
brake
warning
display
ABS warning
lamp,
ABS warning
display
ASC warning ASC OFF
lamp
lamp
ASC warning
display
C1392
Incomplete learn (Longitudinal
G)
ON
ON
ON
ON
C1393
Incomplete learn neutral(Lateral ON
G)
ON
ON
ON
C2204
Sensor cluster internal error
OFF
OFF*3
ON*4, 6
ON*8
ON*8
C1219
Steering angle sensor signal
OFF
OFF
ON*8
ON*8
C121A
SAS
initialization
ON
ON
ON
ON
C2205
SAS internal error
OFF
OFF
ON
ON
C2002
Valve calibration not completed OFF
ON
ON
ON
C1608
EEPROM fail
OFF
OFF
OFF
OFF
C1707
Implausible coding data
OFF
ON*7
ON
ON*7
U0100
Engine CAN timeout
OFF
OFF
ON
ON
U0101
T/M CAN timeout
OFF
OFF
ON
ON
U0114*4
4WD CAN timeout
OFF
OFF
ON
ON
U0126
SAS CAN timeout
OFF
OFF
ON
ON
U0141
ETACS CAN timeout
OFF
OFF
ON *7
ON
U0401
Engine (CAN message)
OFF
OFF
ON
ON
U0428
SAS (CAN message)
OFF
OFF
ON
ON
U1073
Bus-off
OFF
OFF
ON
ON
U1195
Coding not completed
OFF
ON
ON
ON
U1197
Coding data unavailable
OFF
ON
ON
ON
Steering wheel
sensor neutral
point not
learned
NOTE: .
•
*1
•
*2
•
*3
•
*4
•
*5:
Does not illuminate when there is no effect to the EBD function.
•
*6:
Does not illuminate when there is no effect to the ABS function.
•
*7
•
*8:
: Turns on when two or more wheels are faulty.
: Stays on until the vehicle speed reaches 10 km/h when the ignition switch is turned to ON next time.
: 2WD.
: 4WD.
: May not illuminate in some trouble causes.
Stays on until the vehicle speed 20 km/h or higher and turn left or right when the ignition switch is
turned to on next time.
35C-12
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
Under EBD, ABS, stability control, TCL, brake assist, HSA in case of failure
Diagno
sis
code
No.
Item
EBD
C100A
FL wheel speed
sensor circuit
C1015
FR wheel speed
sensor circuit
C1020
RL wheel speed
sensor circuit
C102B
RR wheel speed
sensor circuit
C1011
FL wheel speed
sensor signal
C101C
FR wheel speed
sensor signal
C1027
RL wheel speed
sensor signal
C1032
RR wheel speed
sensor signal
C1014
FL wheel speed
sensor performance
C101F
FR wheel speed
sensor performance
C102A
RL wheel speed
sensor performance
ABS
Stability
control
TCL
Brake
assist
HSA
Enabled*1 Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Enabled*1 Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Enabled*1 Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C1035
RR wheel speed
sensor performance
C1041
FL wheel speed tone Enabled*1 Prohibited
performance
Prohibited
Prohibited
Prohibited
Prohibited
C1042
FR wheel speed tone
performance
C1043
RL wheel speed tone
performance
C1044
RR wheel speed
tone performance
C1046
FL wheel speed
sensor phase
Prohibited
Prohibited
Prohibited
Prohibited
C1047
FR wheel speed
sensor phase
C1048
RL wheel speed
sensor phase
C1049
RR wheel speed
sensor phase
Enabled*1 Prohibited
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-13
TROUBLESHOOTING
Diagno
sis
code
No.
Item
EBD
C104B
FL inlet valve
C104F
FR inlet valve
C1053
RL inlet valve
C1057
RR inlet valve
C105F
FL outlet valve
C1063
FR outlet valve
C1067
RL outlet valve
C105B
RR outlet valve
C1200
FL-RR cut valve
C1204
FR-RL cut valve
C1208
FL-RR suction valve
C120C
FR-RL suction valve
C2104
ABS
Stability
control
TCL
Brake
assist
HSA
Prohibited Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
Valve power supply
circuit
Prohibited Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C1073
Motor drive circuit
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C2116
Pump motor voltage
low
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C121D
Brake fluid
pressure
sensor
circuit
Only the Enabled
brake
assist is
defectiv
e.
Enabled
Enabled
Enabled
Prohibited
Enabled
Other
than
above
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C121E
Brake fluid pressure
sensor
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C1000
Brake SW (stuck)
Enabled
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
C123B
System control too
long
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
C2200
ECU internal error
Prohibited* Prohibited* Prohibited
Prohibited
Prohibited* Prohibited
4
5
18.0 ±
Prohibited Prohibited
1.0 V or
more
C2101
Power
supply
high
voltage
C1395
Incomplete Brake
fluid filling
Enabled
C121C
Torque request
signal denied
C2206
Re-execution of
variant coding
5
Prohibited
Prohibited
Prohibited
Prohibited
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
35C-14
ACTIVE STABILITY CONTROL SYSTEM (ASC)
Diagno
sis
code
No.
Item
EBD
C1210
Longitudin
al G
sensor
input
circuit
Abnorm Enabled
ality in
longitudi
nal
G-senso
r output
voltage
Enabled*2, Enabled*2, Enabled*2, Enabled*2, Prohibited
Prohibited* Prohibited* Prohibited* Prohibited*
Longitudin
al G
sensor
signal
Abnorm Enabled
ality in
longitudi
nal
G-senso
r output
signal
Enabled*2, Enabled*2, Enabled*2, Enabled*2, Prohibited
Prohibited* Prohibited* Prohibited* Prohibited*
3
3
3
3
C123C
Sensor
cluster
malfunctio
n
Abnorm Enabled
ality in
lateral G
& yaw
rate
output
value
Enabled
Prohibited
Prohibited
Enabled
C1392
Incomplete learn
(Longitudinal G)
C1242
TROUBLESHOOTING
Enabled
ABS
3
Stability
control
3
TCL
3
Brake
assist
HSA
3
Prohibited
Enabled*2, Enabled*2, Enabled*2, Enabled*2, Prohibited
Prohibited* Prohibited* Prohibited* Prohibited*
3
3
3
3
Prohibited
Prohibited
Enabled
C1393
Incomplete learn
neutral(Lateral G)
Enabled
Enabled
C2204
Sensor cluster
internal error
Enabled
Enabled*2, Enabled*2, Enabled*2, Enabled*2, Prohibited
Prohibited* Prohibited* Prohibited* Prohibited*
3, 6
3
3
3
Prohibited
C1219
Steering angle
sensor signal
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
C121A
SAS
Steering Enabled
initializatio wheel
n
sensor
neutral
point not
learned
Enabled
Prohibited
Prohibited
Enabled
Prohibited
C2205
SAS internal error
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
C2002
Valve calibration not
completed
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
C1608
EEPROM fail
Enabled
Enabled
Enabled
Enabled
Enabled
Enabled
C1707
Implausible coding
data
Enabled
Prohibited* Prohibited* Prohibited* Prohibited* Prohibited
U0100
Engine CAN timeout Enabled
6
6
6
6
Enabled
Prohibited
Prohibited
Enabled
Prohibited
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-15
TROUBLESHOOTING
Diagno
sis
code
No.
Item
EBD
ABS
Stability
control
TCL
Brake
assist
HSA
U0101
T/M CAN timeout
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
U0114*3 4WD CAN timeout
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
U0126
SAS CAN timeout
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
U0141
ETACS CAN timeout Enabled
Enabled
Prohibited* Prohibited* Prohibited* Prohibited*
6
6
6
6
U0401
Engine (CAN
message)
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
U0428
SAS (CAN message) Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
U1073
Bus-off
Enabled
Enabled
Prohibited
Prohibited
Enabled
Prohibited
U1195
Coding not
completed
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
U1197
Coding data
unavailable
Enabled
Prohibited
Prohibited
Prohibited
Prohibited
Prohibited
NOTE: .
•
*1
•
*2
•
*3:
4WD.
•
*4:
Not prohibited when the brake warning lamp is not illuminated.
•
*5:
Not prohibited when the ABS warning lamp is not illuminated.
•
*6:
Enabled in some cases.
: Prohibited when two or more wheels are faulty.
: 2WD.
DIAGNOSIS CODE CHART
M1355001101385
CAUTION
During diagnosis, a diagnosis code associated with other system may be set when the ignition switch
is turned on with connector(s) disconnected. On completion, confirm all systems for diagnosis
code(s). If diagnosis code(s) are set, erase them all.
Diagnosis code Item
No.
Reference page
C100A
FL wheel speed sensor circuit
P.35C-18
C1015
FR wheel speed sensor circuit
C1020
RL wheel speed sensor circuit
C102B
RR wheel speed sensor circuit
C1011
FL wheel speed sensor signal
C101C
FR wheel speed sensor signal
C1027
RL wheel speed sensor signal
C1032
RR wheel speed sensor signal
P.35C-21
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-16
TROUBLESHOOTING
Diagnosis code Item
No.
Reference page
C1014
FL wheel speed sensor performance
P.35C-24
C101F
FR wheel speed sensor performance
C102A
RL wheel speed sensor performance
C1035
RR wheel speed sensor performance
C1041
FL wheel speed tone performance
C1042
FR wheel speed tone performance
C1043
RL wheel speed tone performance
C1044
RR wheel speed tone performance
C1046
FL wheel speed sensor phase
C1047
FR wheel speed sensor phase
C1048
RL wheel speed sensor phase
C1049
RR wheel speed sensor phase
C104B
FL inlet valve
C104F
FR inlet valve
C1053
RL inlet valve
C1057
RR inlet valve
C105F
FL outlet valve
C1063
FR outlet valve
C1067
RL outlet valve
C105B
RR outlet valve
C1200
FL-RR cut valve
C1204
FR-RL cut valve
C1208
FL-RR suction valve
C120C
FR-RL suction valve
C2104
Valve power supply circuit
P.35C-33
C1073
Motor drive circuit
P.35C-35
C2116
Pump motor voltage low
P.35C-37
C121D
Brake fluid pressure sensor circuit
P.35C-38
C121E
Brake fluid pressure sensor
P.35C-39
C1000
Brake SW (stuck)
P.35C-41
C123B
System control too long
P.35C-42
C2200
ECU internal error
P.35C-43
C2101
Power supply high voltage
C1395
Incomplete Brake fluid filling
P.35C-45
C121C
Torque request signal denied
P.35C-45
C2206
Re-execution of variant coding
P.35C-46
C1210
Longitudinal G sensor input
circuit
P.35C-27
P.35C-29
P.35C-32
18.0 ± 1.0 V or more
Abnormality in longitudinal
G-sensor output voltage
P.35C-44
P.35C-47
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-17
TROUBLESHOOTING
Diagnosis code Item
No.
Reference page
C1242
Longitudinal G sensor signal
Abnormality in longitudinal
G-sensor output signal
P.35C-48
C123C
Sensor cluster malfunction
Abnormality in lateral G and
yaw rate output value
P.35C-49
C1392
Incomplete learn neutral((Longitudinal G)
C1393
Incomplete learn neutral(Lateral G)
C2204
Sensor cluster internal error
Communication error
P.35C-51
P.35C-52
Abnormality in lateral G-sensor
output voltage
Abnormality in yaw rate sensor
output voltage
C1219
Steering angle sensor signal
C121A
SAS initialization
C2205
SAS internal error
P.35C-56
C2002
Valve calibration not completed
P.35C-56
C1608
EEPROM fail
P.35C-57
C1707
Implausible coding data
P.35C-59
U0100
Engine CAN timeout
P.35C-60
U0101
T/M CAN timeout
U0114*
4WD CAN timeout
U0126
SAS CAN timeout
U0141
ETACS CAN timeout
U0401
Engine (CAN message)
P.35C-61
U0428
SAS (CAN message)
P.35C-62
U1073
Bus-off
P.35C-63
U1195
Coding not completed
P.35C-64
U1197
P.35C-53
Steering wheel sensor neutral
point not learned
P.35C-55
Coding data unavailable
*:
NOTE: When the diagnosis codes relating to the CAN communication error are output, make sure of the
vehicle equipment. When the vehicle is not equipped with the system the ASC-ECU communicates to the
diagnosis code is always output. This is not abnormal.
35C-18
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
DIAGNOSIS CODE PROCEDURES
Code No. C100A FL wheel speed sensor circuit
Code No. C1015 FR wheel speed sensor circuit
Code No. C1020 RL wheel speed sensor circuit
Code No. C102B RR wheel speed sensor circuit
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
• The wheel speed sensor is a kind of a pulse generator. It consists of encoders (a plate on which
north and south pole sides of the magnets are
arranged alternately) for detecting the wheel
speed which rotates at the same speed of the
wheels and wheel speed sensors. This sensor
outputs frequency pulse signals in proportion to
the wheel speed.
• The pulse signals, which the wheel speed sensor
creates, are sent to ASC-ECU. ASC-ECU uses
the frequency of the pulse signals to determine
the wheel speed.
DIAGNOSIS CODE SET CONDITIONS
ASC-ECU monitors the voltage fluctuation in each
wheel speed sensor circuit. If ASC-ECU detects the
open or short circuit in the circuit, it will set a diagnosis code.
PROBABLE CAUSES
Current trouble
• Damaged wiring harness and connectors
• Noise interference
• Malfunction of wheel speed sensor
• Malfunction of ASC-ECU
Past trouble
• Carry out diagnosis with particular emphasis on
wiring harness and connector failures between
ASC-ECU and the wheel speed sensor. For diagnosis procedures, refer to How to treat past trouble (GROUP 00 − How to Use
Troubleshooting/How to Treat Past Trouble ).
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is diagnosis code No. C100A, 1015, 1020 or 102B
set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. M.U.T.-III data list
Check the following data list (Refer to P.35C-85).
• Item No.01: FL wheel speed sensor
• Item No.02: FR wheel speed sensor
• Item No.03: RL wheel speed sensor
• Item No.04: RR wheel speed sensor
Q: Is the check result normal?
YES : Go to Step 10.
NO : Go to Step 4.
STEP 4. Voltage measurement at the ASC-ECU
connector (FL+, FL-, FR+, FR-, RL+, RL-, RR+,
RR- terminal)
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the ON position.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
Code No.C100A is set
• Measure the voltage between the ASC-ECU
connector (FL+ terminal) and the body earth,
and between the ASC-ECU connector (FLterminal) and the body earth.
OK: 1 V or less
Code No.C1015 is set
• Measure the voltage between the ASC-ECU
connector (FR+ terminal) and the body earth,
and between the ASC-ECU connector (FRterminal) and the body earth.
OK: 1 V or less
Code No.C1020 is set
• Measure the voltage between the ASC-ECU
connector (RL+ terminal) and the body earth,
and between the ASC-ECU connector (RLterminal) and the body earth.
OK: 1 V or less
Code No.C102B is set
• Measure the voltage between the ASC-ECU
connector (RR+ terminal) and the body earth,
and between the ASC-ECU connector (RRterminal) and the body earth.
OK: 1 V or less
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 6.
35C-19
STEP 5. Resistance measurement at ASC-ECU
connector (FL+, FL-, FR+, FR-, RL+, RL-, RR+,
RR- terminal)
Disconnect the connector, and measure at the wiring
harness side.
Code No.C100A is set
• Measure the resistance between the ASC-ECU
connector (FL+ terminal) and the body earth, and
between the ASC-ECU connector (FL- terminal)
and the body earth.
OK: No continuity
Code No.C1015 is set
• Measure the resistance between the ASC-ECU
connector (FR+ terminal) and the body earth, and
between the ASC-ECU connector (FR- terminal)
and the body earth.
OK: No continuity
Code No.C1020 is set
• Measure the resistance between the ASC-ECU
connector (RL+ terminal) and the body earth, and
between the ASC-ECU connector (RL- terminal)
and the body earth.
OK: No continuity
Code No.C102B is set
• Measure the resistance between the ASC-ECU
connector (RR+ terminal) and the body earth,
and between the ASC-ECU connector (RR- terminal) and the body earth.
OK: No continuity
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Check the wiring harness between the
ASC-ECU connector terminal and the wheel
speed sensor connector terminal.
Code No.C100A is set
• Check of short circuit in FL+, FL- line between
ASC-ECU connector and front wheel speed sensor (LH) connector.
Code No.C1015 is set
• Check of short circuit in FR+, FR- line between
ASC-ECU connector and front wheel speed sensor (RH) connector.
Code No.C1020 is set
• Check of short circuit in RL+, RL- line between
ASC-ECU connector and rear wheel speed sensor (LH) connector.
Code No.C102B is set
• Check of short circuit in RR+, RR- line between
ASC-ECU connector and rear wheel speed sensor (LH) connector.
Q: Is the check result normal?
YES : Replace the wheel speed sensor (Refer to
P.35C-97 <front> or P.35C-97 <rear>).
Then go to Step 11.
NO : Repair the connector(s) or wiring harness.
Then go to Step 11.
35C-20
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 7. Resistance measurement at the
ASC-ECU connector (FL+, FL-, FR+, FR-, RL+,
RL-, RR+, RR- terminal)
Disconnect the connector, and measure at the wiring
harness side.
Code No.C100A is set
• Measure the resistance between the ASC-ECU
connector (FL+ terminal) and the ASC-ECU connector (FL- terminal).
OK: Continuity
Code No.C1015 is set
• Measure the resistance between the ASC-ECU
connector (FR+ terminal) and the ASC-ECU connector (FR- terminal).
OK: Continuity
Code No.C1020 is set
• Measure the resistance between the ASC-ECU
connector (RL+ terminal) and the ASC-ECU connector (RL- terminal).
OK: Continuity
Code No.C102B is set
• Measure the resistance between the ASC-ECU
connector (RR+ terminal) and the ASC-ECU connector (RR- terminal).
OK: Continuity
Q: Is the check result normal?
YES : Go to Step 8.
NO : Go to Step 10.
STEP 8. Check the wiring harness between the
ASC-ECU connector terminal and the wheel
speed sensor connector terminal
Code No.C100A is set
• Check of open circuit in FL+, FL- line between
ASC-ECU connector and front wheel speed sensor (LH) connector.
Code No.C1015 is set
• Check of open circuit in FR+, FR- line between
ASC-ECU connector and front wheel speed sensor (RH) connector.
Code No.C1020 is set
• Check of open circuit in RL+, RL- line between
ASC-ECU connector and rear wheel speed sensor (LH) connector.
Code No.C102B is set
• Check of open circuit in RR+, RR- line between
ASC-ECU connector and rear wheel speed sensor (RH) connector.
Q: Is the check result normal?
YES : Go to Step 9.
NO : Repair the connector(s) or wiring harness.
Then go to Step 11.
STEP 9. Check for wheel speed sensor as a
single unit
Refer to P.35C-97.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Replace the wheel speed sensor (Refer to
P.35C-97 <front> or P.35C-97 <rear>).
Then go to Step 11.
STEP 10. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is diagnosis code No. C100A, 1015, 1020 or 102B
set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 11.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 11. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
35C-21
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is diagnosis code No. C100A, 1015, 1020 or 102B
set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C1011 FL wheel speed sensor signal
Code No. C101C FR wheel speed sensor signal
Code No. C1027 RL wheel speed sensor signal
Code No. C1032 RR wheel speed sensor signal
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
• The wheel speed sensor is a kind of a pulse generator. It consists of encoders (a plate on which
north and south pole sides of the magnets are
arranged alternately) for detecting the wheel
speed which rotates at the same speed of the
wheels and wheel speed sensors. This sensor
outputs frequency pulse signals in proportion to
the wheel speed.
• The pulse signals, which the wheel speed sensor
creates, are sent to ASC-ECU. ASC-ECU uses
the frequency of the pulse signals to determine
the wheel speed.
DIAGNOSIS CODE SET CONDITIONS
ASC-ECU monitors the signals from each wheel
speed sensor while the vehicle is being driven. If any
fault below is found in these sensor signals,
ASC-ECU will set the relevant diagnosis code.
• Irregular change in the wheel speed sensor signal
• Wheel speed sensor signal continuously indicates high value.
PROBABLE CAUSES
Current trouble
• Excessive gap between the wheel speed sensor
and the wheel speed detection encoder
• Adhesion of foreign materials on the wheel speed
sensor
• Adhesion of foreign materials on the wheel speed
detection encoder
• Wheel bearing malfunction
• Malfunction of wheel speed sensor
• Damaged wiring harness and connectors
• External noise interference
• Improper installation of the wheel speed sensor
• Deformation of the wheel speed detection
encoder
• ASC-ECU malfunction
• Disturbance of magnetisation pattern for wheel
speed detection encoder
• The number of poles on the Magnetic encoder for
wheel speed detection (N-pole and S-pole) is
changed
Past trouble
• When diagnosis code No.C100A, C1015, C1020
or C102B is also set, carry out diagnosis with particular emphasis on wiring harness and connector
failures between ASC-ECU and the wheel speed
sensor. For diagnosis procedures, refer to How to
treat past trouble (GROUP 00 − How to Use
Troubleshooting/How to Treat Past Trouble ).
• When diagnosis code No.C100A, C1015, C1020
or C102B is not set, the following conditions may
be present:
• Some wheels slip
• Unstable vehicle attitude
• External noise interference
• Vehicle ran with the parking brake applied
35C-22
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No.C1011, C101C, C1027 or
C1032 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. M.U.T.-III diagnosis code
Check that diagnosis code No.C100A, C1015,
C1020 or C102B is also set.
Q: Is diagnosis code No.C100A, C1015, C1020 or
C102B also set?
YES : Perform the diagnosis for diagnosis code
No.C100A, C1015, C1020 or C102B (Refer
to P.35C-18).
NO : Go to Step 4.
STEP 4. Check the wiring harness between the
ASC-ECU connector terminal and the wheel
speed sensor connector terminal
Code No.C1011 is set
• Check of short to power supply, short to earth,
and open circuit in FL+, FL− line between
ASC-ECU connector and front wheel speed sensor (LH) connector.
Code No.C101C is set
• Check of short to power supply, short to earth,
and open circuit in FR+, FR− line between
ASC-ECU connector and front wheel speed sensor (RH) connector.
Code No.C1027 is set
• Check of short to power supply, short to earth,
and open circuit in RL+, RL− line between
ASC-ECU connector and rear wheel speed sensor (LH) connector.
Code No.C1032 is set
• Check of short to power supply, short to earth,
and open circuit in RR+, RR− line between
ASC-ECU connector and rear wheel speed sensor (RH) connector.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair the connector(s) or wiring harness.
Then go to Step 11.
STEP 5. Check for wheel speed sensor
installation
Check how the wheel speed sensor is installed (Disconnection of wheel speed sensor, loose mounting
bolt, etc.).
Q: Is the check result normal?
YES : Go to Step 6.
NO : Reinstall the wheel speed sensor correctly
(Refer to P.35C-97 <front> or P.35C-97
<rear>). Then go to Step 6.
STEP 6. Check for wheel speed sensor output
current
Refer to P.35C-90.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the wheel speed sensor (Refer to
P.35C-97 <front> or P.35C-97 <rear>).
Then go to Step 10.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-23
TROUBLESHOOTING
STEP 7. Check for wheel bearing looseness
NOTE: Loose wheel bearing may increase the gap
between the wheel speed sensor and the wheel
speed detection magnet encoder. Check the wheel
bearing for looseness. <Refer to GROUP 26 − Wheel
Bearing Axial Play Check . (front), GROUP 27A −
Wheel Bearing Axial Play Check (rear-2WD) or
GROUP 27B − Wheel Bearing Axial Play Check
(rear-4WD)>
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the wheel bearing <front> or rear
wheel hub assembly <rear>. <Refer to
GROUP 26 − Front Axle Hub Assembly
(front), GROUP 27A − Rear Axle Hub
Assembly (rear-2WD) or GROUP 27B −
Rear Axle Hub Assembly (rear-4WD)>
Then go to Step 11.
STEP 8. Check of wheel speed detection encoder
<Front>
Oil seal
Magnetic
encoder
Wheel
bearing
AC504925 AD
<Rear>
<2WD>
Ball bearing
Rear hub
assembly
Magnetic
encoder
<4WD>
Rear wheel bearing
Magnetic
encoder
Rear hub
assembly
AC808708 AC
Check the encoder for adhesion of foreign materials
or deformation.
Q: Is the check result normal?
YES : Go to Step 9.
NO (Adhesion of foreign materials) : Remove the
foreign materials and clean the encoder so
as not to disturb the magnetization pattern
on it while taking care of the magnet,
magnetic substance, and magnetic
attraction. Then go to Step 11.
NO (Deformation) : Replace the wheel bearing
<front> or rear wheel hub assembly <rear>.
<Refer to GROUP 26 − Front Axle Hub
Assembly (front), GROUP 27A − Rear Axle
Hub Assembly (rear-2WD) or GROUP 27B
− Rear Axle Hub Assembly (rear-4WD)>
Then go to Step 11.
STEP 9. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
35C-24
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1011, C101C, C1027 or
C1032 set?
YES : Replace the wheel speed sensor (Refer to
P.35C-97 <front> or P.35C-97 <rear>).
Then go to Step 10.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 10. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1011, C101C, C1027 or
C1032 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 11.
NO : This diagnosis is complete.
STEP 11. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1011, C101C, C1027 or
C1032 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C1014 FL wheel speed sensor performance
Code No. C101F FR wheel speed sensor performance
Code No. C102A RL wheel speed sensor performance
Code No. C1035 RR wheel speed sensor performance
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
• The wheel speed sensor is a kind of a pulse generator. It consists of encoders (a plate on which
north and south pole sides of the magnets are
arranged alternately) for detecting the wheel
speed which rotates at the same speed of the
wheels and wheel speed sensors. This sensor
outputs frequency pulse signals in proportion to
the wheel speed.
• The pulse signals, which the wheel speed sensor
creates, are sent to ASC-ECU. ASC-ECU uses
the frequency of the pulse signals to determine
the wheel speed.
DIAGNOSIS CODE SET CONDITIONS
ASC-ECU monitors the signals from each wheel
speed sensor while the vehicle is being driven. If any
fault below is found in these sensor signals,
ASC-ECU will set the relevant diagnosis code.
• Missing wheel speed sensor signal
• Wheel speed sensor signal continuously indicates low value.
PROBABLE CAUSES
Current trouble
• Excessive gap between the wheel speed sensor
and the wheel speed detection encoder
• Wheel bearing malfunction
• Deformation of the wheel speed detection
encoder
• Adhesion of foreign materials on the wheel speed
sensor
• Adhesion of foreign materials on the wheel speed
detection encoder
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
•
•
•
•
Malfunction of wheel speed sensor
Improper installation of the wheel speed sensor
ASC-ECU malfunction
The number of poles on the Magnetic encoder for
wheel speed detection (N-pole and S-pole) is
changed
Past trouble
• When diagnosis code No.C100A, C1015, C1020
or C102B is also set, carry out diagnosis with particular emphasis on wiring harness and connector
failures between ASC-ECU and the wheel speed
sensor. For diagnosis procedures, refer to How to
treat past trouble (GROUP 00 − How to Use
Troubleshooting/How to Treat Past Trouble ).
• When diagnosis code No.C100A, C1015, C1020
or C102B is not set, the following conditions may
be present:
• Some wheels slip
• Unstable vehicle attitude
• External noise interference
• Vehicle ran with the parking brake applied.
• Rotate only two wheels with drum tester
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No.C1014, C101F, C102A or
C1035 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
35C-25
STEP 4. Check the wiring harness between the
ASC-ECU connector terminal and the wheel
speed sensor connector terminal
Code No.C1014 is set
• Check of short to power supply, short to earth,
and open circuit in FL+, FL− line between
ASC-ECU connector and front wheel speed sensor (LH) connector.
Code No.C101F is set
• Check of short to power supply, short to earth,
and open circuit in FR+, FR− line between
ASC-ECU connector and front wheel speed sensor (RH) connector.
Code No.C102A is set
• Check of short to power supply, short to earth,
and open circuit in RL+, RL− line between
ASC-ECU connector and rear wheel speed sensor (LH) connector.
Code No.C1035 is set
• Check of short to power supply, short to earth,
and open circuit in RR+, RR− line between
ASC-ECU connector and rear wheel speed sensor (RH) connector.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair the connector(s) or wiring harness.
Then go to Step 11.
STEP 5. Check for wheel speed sensor
installation
Check how the wheel speed sensor is installed (Disconnection of wheel speed sensor, loose mounting
bolt, etc.).
Q: Is the check result normal?
YES : Go to Step 6.
NO : Reinstall the wheel speed sensor correctly
(Refer to P.35C-97 <front> or P.35C-97
<rear>). Then go to Step 6.
STEP 3. M.U.T.-III diagnosis code
Check that diagnosis code No.C100A, C1015,
C1020 or C102B is also set.
STEP 6. Check for wheel speed sensor output
current
Refer to P.35C-90.
Q: Is diagnosis code No.C100A, C1015, C1020 or
C102B also set?
YES : Perform the diagnosis for diagnosis code
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the wheel speed sensor (Refer to
No.C100A, C1015, C1020 or C102B (Refer
to P.35C-18).
NO : Go to Step 4.
P.35C-97 <front> or P.35C-97 <rear>).
Then go to Step 10.
35C-26
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 7. Check for wheel bearing looseness
NOTE: Loose wheel bearing may increase the gap
between the wheel speed sensor and the wheel
speed detection magnet encoder. Check the wheel
bearing for looseness. <Refer to GROUP 26 − Wheel
Bearing Axial Play Check . (front), GROUP 27A −
Wheel Bearing Axial Play Check (rear-2WD) or
GROUP 27B − Wheel Bearing Axial Play Check
(rear-4WD)>
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the wheel bearing <front> or rear
wheel hub assembly <rear>. <Refer to
GROUP 26 − Front Axle Hub Assembly
(front), GROUP 27A − Rear Axle Hub
Assembly (rear-2WD) or GROUP 27B −
Rear Axle Hub Assembly (rear-4WD)>
Then go to Step 11.
STEP 8. Check of wheel speed detection encoder
<Front>
Oil seal
Wheel
bearing
Magnetic
encoder
AC504925 AD
<Rear>
<2WD>
Ball bearing
Rear hub
assembly
Magnetic
encoder
<4WD>
Rear wheel bearing
Magnetic
encoder
Rear hub
assembly
AC808708 AC
Check the encoder for adhesion of foreign materials
or deformation.
Q: Is the check result normal?
YES : Go to Step 9.
NO (Adhesion of foreign materials) : Remove the
foreign materials and clean the encoder so
as not to disturb the magnetisation pattern
on it while taking care of the magnet,
magnetic substance, and magnetic
attraction. Then go to Step 9.
NO (Deformation) : Replace the wheel bearing
<front> or rear wheel hub assembly <rear>.
<Refer to GROUP 26 − Front Axle Hub
Assembly (front), GROUP 27A − Rear Axle
Hub Assembly (rear-2WD) or GROUP 27B
− Rear Axle Hub Assembly (rear-4WD)>
Then go to Step 9.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 9. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is diagnosis code No. C1014, C101F, C102A or
C1035 set?
YES : Replace the wheel speed sensor (Refer to
P.35C-97 <front> or P.35C-97 <rear>).
Then go to Step 10.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 10. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
35C-27
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is diagnosis code No. C1014, C101F, C102A or
C1035 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 11.
NO : This diagnosis is complete.
STEP 11. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is diagnosis code No. C1014, C101F, C102A or
C1035 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C1041 FL wheel speed tone performance
Code No. C1042 FR wheel speed tone performance
Code No. C1043 RL wheel speed tone performance
Code No. C1044 RR wheel speed tone performance
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
• The wheel speed sensor is a kind of a pulse generator. It consists of encoders (a plate on which
north and south pole sides of the magnets are
arranged alternately) for detecting the wheel
speed which rotates at the same speed of the
wheels and wheel speed sensors. This sensor
outputs frequency pulse signals in proportion to
the wheel speed.
• The pulse signals, which the wheel speed sensor
creates, are sent to ASC-ECU. ASC-ECU uses
the frequency of the pulse signals to determine
the wheel speed.
DIAGNOSIS CODE SET CONDITIONS
ASC-ECU monitors the signals from each wheel
speed sensor while the vehicle is being driven. If any
periodical drop is found in these sensor signals,
ASC-ECU will set the relevant diagnosis code.
PROBABLE CAUSES
• Wheel bearing malfunction
• Deformation of the wheel speed detection
encoder
• Adhesion of foreign materials on the wheel speed
detection encoder
• ASC-ECU malfunction
• The number of poles on the Magnetic encoder for
wheel speed detection (N-pole and S-pole) is
changed
35C-28
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
DIAGNOSIS PROCEDURE
STEP 4. Check of wheel speed detection encoder
<Front>
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No.C1041, 1042, 1043 or 1044
set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Check for wheel bearing looseness
NOTE: Loose wheel bearing may increase the gap
between the wheel speed sensor and the wheel
speed detection magnet encoder. Check the wheel
bearing for looseness. <Refer to GROUP 26 − Wheel
Bearing Axial Play Check . (front), GROUP 27A −
Wheel Bearing Axial Play Check (rear-2WD) or
GROUP 27B − Wheel Bearing Axial Play Check
(rear-4WD)>
Oil seal
Wheel
bearing
AC504925 AD
<Rear>
<2WD>
Ball bearing
Rear hub
assembly
Magnetic
encoder
<4WD>
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the wheel bearing <front> or rear
wheel hub assembly <rear>. <Refer to
GROUP 26 − Front Axle Hub Assembly
(front), GROUP 27A − Rear Axle Hub
Assembly (rear-2WD) or GROUP 27B −
Rear Axle Hub Assembly (rear-4WD)>
Then go to Step 6.
Magnetic
encoder
Rear wheel bearing
Magnetic
encoder
Rear hub
assembly
AC808708 AC
Check the encoder for adhesion of foreign materials
or deformation.
Q: Is the check result normal?
YES : Go to Step 5.
NO (Adhesion of foreign materials) : Remove the
foreign materials and clean the encoder so
as not to disturb the magnetisation pattern
on it while taking care of the magnet,
magnetic substance, and magnetic
attraction. Then go to Step 6.
NO (Deformation) : Replace the wheel bearing
<front> or rear wheel hub assembly <rear>.
<Refer to GROUP 26 − Front Axle Hub
Assembly (front), GROUP 27A − Rear Axle
Hub Assembly (rear-2WD) or GROUP 27B
− Rear Axle Hub Assembly (rear-4WD)>
Then go to Step 6.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
35C-29
STEP 5. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
STEP 6. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is diagnosis code No. C1041, 1042, 1043 or 1044
set?
YES : Replace the hydraulic unit (integrated with
Q: Is diagnosis code No. C1041, 1042, 1043 or 1044
set?
YES : Return to Step 1.
NO : This diagnosis is complete.
ASC-ECU) (Refer to P.35C-95). Then go to
Step 6.
NO : This diagnosis is complete.
Code No. C1046 FL wheel speed sensor phase
Code No. C1047 FR wheel speed sensor phase
Code No. C1048 RL wheel speed sensor phase
Code No. C1049 RR wheel speed sensor phase
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
• The wheel speed sensor is a kind of a pulse generator. It consists of encoders (a plate on which
north and south pole sides of the magnets are
arranged alternately) for detecting the wheel
speed which rotates at the same speed of the
wheels and wheel speed sensors. This sensor
outputs frequency pulse signals in proportion to
the wheel speed.
• The pulse signals, which the wheel speed sensor
creates, are sent to ASC-ECU. ASC-ECU uses
the frequency of the pulse signals to determine
the wheel speed.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if any malfunction below is
found:
• When the brake fluid pressure is decreased for a
long time.
• When the brake fluid pressure is held for a long
time.
PROBABLE CAUSES
•
•
•
•
•
•
•
•
•
•
•
•
Damaged wiring harness and connectors
External noise interference
Malfunction of wheel speed sensor
ASC-ECU malfunction
Excessive gap between the wheel speed sensor
and the magnetic encoder for wheel speed detection
Adhesion of foreign materials on the wheel speed
sensor
Adhesion of foreign materials on the magnetic
encoder for wheel speed detection
Wheel bearing malfunction
Improper installation of the wheel speed sensor
Deformation of the magnetic encoder for wheel
speed detection
Disturbance of magnetization pattern for magnetic encoder for wheel speed detection
Missing teeth of the magnetic encoder for wheel
speed detection
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
35C-30
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No.C1046, C1047, C1048 or
C1049 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. M.U.T.-III diagnosis code
Code No.C1046 is set
• Check that the diagnosis codes No.C100A,
C1011, C1014, and C1041 are also set.
Code No.C1047 is set
• Check that the diagnosis codes No.C1015,
C101C, C101F, and C1042 are also set.
Code No.C1048 is set
• Check that the diagnosis codes No.C1020,
C1027, C102A, and C1043 are also set.
Code No.C1049 is set
• Check that the diagnosis codes No.C102B,
C1032, C1035, and C1044 are also set.
Q: Are the diagnosis codes set?
YES : Carry out the diagnosis for the relevant
STEP 5. Check the wiring harness between the
ASC-ECU connector terminal and the wheel
speed sensor connector terminal
Code No.C1046 is set
• Check of short to power supply, short to earth,
and open circuit in FL+, FL− line between
ASC-ECU connector and front wheel speed sensor (LH) connector.
Code No.C1047 is set
• Check of short to power supply, short to earth,
and open circuit in FR+, FR− line between
ASC-ECU connector and front wheel speed sensor (RH) connector.
Code No.C1048 is set
• Check of short to power supply, short to earth,
and open circuit in RL+, RL− line between
ASC-ECU connector and rear wheel speed sensor (LH) connector.
Code No.C1049 is set
• Check of short to power supply, short to earth,
and open circuit in RR+, RR− line between
ASC-ECU connector and rear wheel speed sensor (RH) connector.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair the connector(s) or wiring harness.
Then go to Step 12.
diagnosis codes.
NO : Go to Step 4.
STEP 4. M.U.T.-III data list
Check the following data list (Refer to P.35C-85).
• Item No.01: FL wheel speed sensor
• Item No.02: FR wheel speed sensor
• Item No.03: RL wheel speed sensor
• Item No.04: RR wheel speed sensor
Q: Is the check result normal?
YES : Go to Step 10.
NO : Go to Step 5.
STEP 6. Check for wheel speed sensor
installation
Check how the wheel speed sensor is installed (Disconnection of wheel speed sensor, loose mounting
bolt, etc.).
Q: Is the check result normal?
YES : Go to Step 7.
NO : Reinstall the wheel speed sensor correctly
(Refer to P.35C-97 <front> or P.35C-97
<rear>). Then go to Step 7.
STEP 7. Check for wheel speed sensor output
current
Refer to P.35C-90.
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the wheel speed sensor (Refer to
P.35C-97 <front> or P.35C-97 <rear>).
Then go to Step 11.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-31
TROUBLESHOOTING
STEP 8. Check for wheel bearing looseness
NOTE: Loose wheel bearing may increase the gap
between the wheel speed sensor and the wheel
speed detection magnet encoder. Check the wheel
bearing for looseness. <Refer to GROUP 26 − Wheel
Bearing Axial Play Check . (front), GROUP 27A −
Wheel Bearing Axial Play Check (rear-2WD) or
GROUP 27B − Wheel Bearing Axial Play Check
(rear-4WD)>
Q: Is the check result normal?
YES : Go to Step 9.
NO : Replace the wheel bearing <front> or rear
wheel hub assembly <rear>. <Refer to
GROUP 26 − Front Axle Hub Assembly
(front), GROUP 27A − Rear Axle Hub
Assembly (rear-2WD) or GROUP 27B −
Rear Axle Hub Assembly (rear-4WD)>
Then go to Step 12.
STEP 9. Check of wheel speed detection encoder
<Front>
Oil seal
Wheel
bearing
Magnetic
encoder
AC504925 AD
<Rear>
<2WD>
Ball bearing
Rear hub
assembly
Magnetic
encoder
<4WD>
Rear wheel bearing
Magnetic
encoder
Rear hub
assembly
AC808708 AC
Check the encoder for adhesion of foreign materials
or deformation.
Q: Is the check result normal?
YES : Go to Step 10.
NO (Adhesion of foreign materials) : Remove the
foreign materials and clean the encoder so
as not to disturb the magnetization pattern
on it while taking care of the magnet,
magnetic substance, and magnetic
attraction. Then go to Step 12.
NO (Deformation) : Replace the wheel bearing
<front> or rear wheel hub assembly <rear>.
<Refer to GROUP 26 − Front Axle Hub
Assembly (front), GROUP 27A − Rear Axle
Hub Assembly (rear-2WD) or GROUP 27B
− Rear Axle Hub Assembly (rear-4WD)>
Then go to Step 12.
35C-32
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 10. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1046, C1047, C1048 or
C1049 set?
YES : Replace the wheel speed sensor (Refer to
P.35C-97 <front> or P.35C-97 <rear>).
Then go to Step 11.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 11. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1046, C1047, C1048 or
C1049 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 12.
NO : This diagnosis is complete.
STEP 12. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1046, C1047, C1048 or
C1049 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C104B FL inlet valve
Code No. C104F FR inlet valve
Code No. C1053 RL inlet valve
Code No. C1057 RR inlet valve
Code No. C105F FL outlet valve
Code No. C1063 FR outlet valve
Code No. C1067 RL outlet valve
Code No. C105B RR outlet valve
Code No. C1200 FL-RR cut valve
Code No. C1204 FR-RL cut valve
Code No. C1208 FL-RR suction valve
Code No. C120C FR-RL suction valve
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
• ASC-ECU contains the power supply circuit (+BV
terminal) for the solenoid valve. The solenoid
valve is energised by the valve relay, which is
incorporated in ASC-ECU.
• The valve relay, which is incorporated in
ASC-ECU, is always energising the solenoid
valve unless the initial check is in progress when
the ignition switch is turned on, and the recurrent
system check is in progress.
• ASC-ECU activates the solenoid valve by turning
on its driving transistor.
DIAGNOSIS CODE SET CONDITIONS
These diagnosis codes will be set under the cases
below:
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
• The solenoid valve is not energized even after
ASC-ECU has turned on the driving transistor
(Open circuit is present in the power supply circuit to the ASC-ECU solenoid valve, or the valve
relay has failed).
• After ASC-ECU has turned off the driving transistor, the solenoid valve still remains energized
(short in the solenoid valve circuit).
• When a solenoid valve failure is detected
PROBABLE CAUSES
• ASC-ECU malfunction
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
35C-33
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the relevant diagnosis code set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is the relevant diagnosis code set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 4.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 4. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is the relevant diagnosis code set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C2104 Valve power supply circuit
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
• ASC-ECU contains the power supply circuit (+BV
terminal) for the solenoid valve. The solenoid
valve is energised by the valve relay, which is
incorporated in ASC-ECU.
• The valve relay, which is incorporated in
ASC-ECU, is always energising the solenoid
valve unless the initial check is in progress when
the ignition switch is turned on, and the recurrent
system check is in progress.
DIAGNOSIS CODE SET CONDITIONS
This diagnostic trouble codes will be set when the
solenoid valve supply voltage is not within the standard value.
PROBABLE CAUSES
Current trouble
• Fusible link malfunction
• Damaged wiring harness and connectors
• Abnormality in battery or alternator
• ASC-ECU malfunction
35C-34
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
Past trouble
• Carry out diagnosis with particular emphasis on
wiring harness and connector failures between
the power supply circuit (+BV terminal) to
ASC-ECU solenoid valve or earth circuit (GND1,
GND2 terminal). For diagnosis procedures, refer
to How to treat past trouble (GROUP 00 − How to
Use Troubleshooting/How to Treat Past Trouble ).
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No. C2104 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Battery check
Refer to GROUP 54A − Battery Test .
Q: Is the battery in good condition?
YES : Go to Step 4.
NO : Replace the battery. Then go to Step 10.
STEP 4. Charging system check
Refer to GROUP 16 − On−vehicle Service/Alternator
Output Line Voltage Drop Test .
Q: Is the charging system in good condition?
YES : Go to Step 5.
NO : Repair or replace the charging system
component(s). Then go to Step 10.
STEP 5. Fusible link check: Check the fusible link
No.4 and SBF7.
Visually check for open circuit in the fusible link No.4
and SBF7.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Resistance measurement at ASC-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Disconnect the fusible link No.SBF7.
(3) Resistance between the +BV terminal and the
body earth.
OK: No continuity
Q: Is the check result normal?
YES : Replace the fusible link No.4 or SBF7. Then
go to Step 10.
NO : The short circuit may be present in the
power supply circuit. Repair the wiring
harness between the ASC-ECU connector
+BV terminal and the fusible link, and then
replace the fusible link No.4 or SBF7. Then
go to Step 10.
STEP 7. Voltage measurement at the ASC-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the voltage between the +BV terminal
and the body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Go to Step 8.
NO : The open circuit may be present in the
power supply circuit. Repair the wiring
harness between the ASC-ECU connector
+BV terminal and the fusible link. Then go to
Step 10.
STEP 8. Resistance measurement at ASC-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Resistance between the GND1 terminal and the
body earth, and between the GND2 terminal and
the body earth
OK: Continuity exists (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 9.
NO : An open circuit may be present in the earth
circuit. Repair the wiring harness between
the ASC-ECU connector GND1 terminal
and the body earth, and between the
ASC-ECU connector GND2 terminal and
the body earth. Then go to Step 10.
STEP 9. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is the diagnosis code No.C2104 set?
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 10.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
35C-35
STEP 10. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C2104 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C1073 Motor drive circuit
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
• ASC-ECU contains the power supply circuit (+BM
terminal) for the pump motor. The pump motor is
energised by the motor switch, which is incorporated in ASC-ECU.
• The pump motor switch, which is incorporated in
ASC-ECU, is always off unless the motor solenoid valve check is activated when the vehicle is
started.
• ASC-ECU activates the pump motor by turning
on the ECU built-in pump motor switch.
DIAGNOSIS CODE SET CONDITIONS
If the pump motor switch voltage drop indicates high
value when the pump motor operates or after the
operation, the pump motor operation is stopped and
this diagnosis code is set.
PROBABLE CAUSES
Current trouble
• Fusible link malfunction
• Damaged wiring harness and connectors
• Abnormality in battery or alternator
• ASC-ECU malfunction
Past trouble
• Carry out diagnosis with particular emphasis on
wiring harness and connector failures between
the power supply circuit (+BM terminal) to the
ASC-ECU motor and the earth circuit (GND1,
GND2 terminal). For diagnosis procedures, refer
to How to treat past trouble (GROUP 00 − How to
Use Troubleshooting/How to Treat Past Trouble ).
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No. C1073 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Battery check
Refer to GROUP 54A − Battery Test .
Q: Is the battery in good condition?
YES : Go to Step 4.
NO : Replace the battery. Then go to Step 10.
STEP 4. Charging system check
Refer to GROUP 16 − On−vehicle Service/Alternator
Output Line Voltage Drop Test .
Q: Is the charging system in good condition?
YES : Go to Step 5.
NO : Repair or replace the charging system
component(s). Then go to Step 10.
35C-36
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 5. Fusible link check: Check the fusible link
No.4 and SBF5.
Visually check for open circuit in the fusible link No.4
and SBF5.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Resistance measurement at ASC-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Resistance between the +BM terminal and the
body earth.
OK: No continuity
Q: Is the check result normal?
YES : Replace the fusible link No.4 or SBF5. Then
go to Step 10.
NO : The short circuit may be present in the
power supply circuit. Repair the wiring
harness between the ASC-ECU connector
+BM terminal and the fusible link, and then
replace the fusible link No.4 or SBF5. Then
go to Step 10.
STEP 7. Voltage measurement at the ASC-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the voltage between the +BM terminal
and the body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Go to Step 8.
NO : The open circuit may be present in the
power supply circuit. Repair the wiring
harness between the ASC-ECU connector
+BM terminal and the fusible link. Then go
to Step 10.
STEP 8. Resistance measurement at ASC-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Resistance between the GND1 terminal and the
body earth, and between the GND2 terminal and
the body earth
OK: Continuity exists (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 9.
NO : An open circuit may be present in the earth
circuit. Repair the wiring harness between
the ASC-ECU connector GND1 terminal
and the body earth, and between the
ASC-ECU connector GND2 terminal and
the body earth. Then go to Step 10.
STEP 9. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No. C1073 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 10.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 10. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No. C1073 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
35C-37
Code No. C2116 Pump motor voltage low
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
• ASC-ECU contains the power supply circuit (+BM
terminal) for the pump motor. The pump motor is
energised by the motor switch, which is incorporated in ASC-ECU.
• The pump motor switch, which is incorporated in
ASC-ECU, is always off unless the motor solenoid valve check is activated when the vehicle is
started.
• ASC-ECU activates the pump motor by turning
on the ECU built-in pump motor switch.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis codes will be set under the cases
below:
• When the power supply voltage of the pump
motor, which is not in operation, is abnormally low
for a prolonged period
• When the power supply voltage of the pump
motor, which is not in operation, is abnormally
high for a prolonged period
PROBABLE CAUSES
Current trouble
• Fusible link malfunction
• Damaged wiring harness and connectors
• Abnormality in battery or alternator
• ASC-ECU malfunction
Past trouble
• Carry out diagnosis with particular emphasis on
wiring harness and connector failures between
the power supply circuit (+BM terminal) to the
ASC-ECU motor and the earth circuit (GND1,
GND2 terminal). For diagnosis procedures, refer
to How to treat past trouble (GROUP 00 − How to
Use Troubleshooting/How to Treat Past Trouble ).
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No. C2116 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Battery check
Refer to GROUP 54A − Battery Test .
Q: Is the battery in good condition?
YES : Go to Step 4.
NO : Replace the battery. Then go to Step 10.
STEP 4. Charging system check
Refer to GROUP 16 − − On−vehicle Service/Alternator Output Line Voltage Drop Test .
Q: Is the charging system in good condition?
YES : Go to Step 5.
NO : Repair or replace the charging system
component(s). Then go to Step 10.
STEP 5. Fusible link check: Check the fusible link
No.4 and SFB5.
Visually check for open circuit in the fusible link No.4
and SFB5.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Resistance measurement at ASC-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Disconnect the fusible link No.4 or SFB5.
(3) Resistance between the +BM terminal and the
body earth.
OK: No continuity
Q: Is the check result normal?
35C-38
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
YES : Replace the fusible link No.4 or SFB5. Then
go to Step 10.
NO : The short circuit may be present in the
power supply circuit. Repair the wiring
harness between the ASC-ECU connector
+BM terminal and the fusible link, and then
replace the fusible link No.4 or SFB5. Then
go to Step 10.
STEP 7. Voltage measurement at the ASC-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the voltage between the +BM terminal
and the body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Go to Step 8.
NO : The open circuit may be present in the
power supply circuit. Repair the wiring
harness between the ASC-ECU connector
+BM terminal and the fusible link. Then go
to Step 10.
STEP 8. Resistance measurement at ASC-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Resistance between the GND1 terminal and the
body earth, and between the GND2 terminal and
the body earth.
OK: Continuity exists (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 9.
NO : An open circuit may be present in the earth
circuit. Repair the wiring harness between
the ASC-ECU connector GND1 terminal
and the body earth, and between the
ASC-ECU connector GND2 terminal and
the body earth. Then go to Step 10.
STEP 9. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No. C2116 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 10.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 10. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No. C2116 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C121D Brake fluid pressure sensor circuit
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
OPERATION
The hydraulic sensor is incorporated in the hydraulic
unit. When the brake pedal is depressed, the pressure sensor detects the brake pressure applied from
the master cylinder, converts this pressure into the
voltage signal, and outputs it.
DIAGNOSIS CODE SET CONDITIONS
When the pressure sensor output signal is not within
the standard value range, ASC-ECU outputs this
diagnosis code.
PROBABLE CAUSES
• Incorrect brake pedal height
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
•
•
•
•
Incorrect adjustment of the stop lamp switch
Master cylinder malfunction
Brake booster malfunction
ASC-ECU malfunction
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is diagnosis code No. C121D set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Brake pedal check
Refer to GROUP 35A − On-vehicle Service/Brake
Pedal Check .
Q: Is the check result normal?
YES : Go to Step 4.
NO : Go to GROUP 35A − On-vehicle
Service/Brake Pedal Check . Then go to
Step 7.
35C-39
STEP 4. Check the installation condition of the
stop lamp switch.
Refer to GROUP 35A − On-vehicle Service/Brake
Pedal Check .
Q: Is the check result normal?
YES : Go to Step 5.
NO : Install the stop lamp switch correctly, and
then go to Step 7.
STEP 5. Brake booster check
Refer to GROUP 35A − On-vehicle Service/Brake
Booster Operation Check .
Q: Is the check result normal?
YES : Go to Step 6.
NO : After replacing the brake booster, go to Step
7.
STEP 6. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C121D set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 7.
NO : The trouble can be an intermittent
malfunction (Refer to GROUP 00 − How to
Use Troubleshooting/How to Cope with
Intermittent Malfunctions ).
STEP 7. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C121D set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C121E Brake fluid pressure sensor
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
The hydraulic sensor is incorporated in the hydraulic
unit. When the brake pedal is depressed, the pressure sensor detects the brake pressure applied from
the master cylinder, converts this pressure into the
voltage signal, and outputs it.
35C-40
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
DIAGNOSIS CODE SET CONDITIONS
This diagnosis codes will be set under the cases
below:
• When the pressure sensor offset is not within the
standard value range
• When the estimated pressure sensor temperature is not normal
PROBABLE CAUSES
•
•
•
•
•
•
•
Incorrect adjustment of brake pedal height
Master cylinder malfunction
Brake booster malfunction
Incorrect installation position of stop lamp switch
Malfunction of the stop lamp switch
Brake drag
ASC-ECU malfunction
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is diagnosis code No. C121E set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Brake pedal check
Refer to GROUP 35A − On-vehicle Service/Brake
Pedal Check .
Q: Is the check result normal?
YES : Go to Step 4.
NO : Go to GROUP 35A − On-vehicle
Service/Brake Pedal Check . Then go to
Step 9.
STEP 4. Check for stop lamp switch installation
Refer to GROUP 35A − On-vehicle Service/Brake
Pedal Check .
Q: Is the check result normal?
YES : Go to Step 5.
NO : Install the stop lamp switch correctly (Refer
to GROUP 35A − On-vehicle Service/Brake
Pedal Check ), and then go to Step 9 .
STEP 5. Stop lamp switch continuity check
Refer to GROUP 35A − Brake Pedal .
Q: Is the check result normal?
YES : Go to Step 6.
NO : Replace the stop lamp switch (Refer to
GROUP 35A −Brake Pedal ), and then go to
Step 9.
STEP 6. Brake drag check
Check the brake system for drag.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair the brake drag, and then go to Step
9.
STEP 7. Brake booster check
Refer to GROUP 35A − On-vehicle Service/Brake
Booster Operation Check .
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the brake booster <Refer to
GROUP 35A − Master Cylinder Assembly
and Brake Booster >, and then go to Step 9.
STEP 8. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No. C121E set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 9.
NO : The trouble can be an intermittent
malfunction (Refer to GROUP 00 − How to
Use Troubleshooting/How to Cope with
Intermittent Malfunctions ).
STEP 9. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C121E set?
YES : Return to Step 1.
NO : This diagnosis is complete.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
35C-41
Code No. C1000 Brake SW (stuck)
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
ETACS-ECU sends the ON signal generated when
the brake pedal is depressed and OFF signal generated when it is released to ASC-ECU via the CAN
bus lines.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set in the following case.
• When the vehicle has run for a long time with the
stop lamp switch turned ON.
• When the OFF status of the stop lamp switch
does not match the vehicle attitude
PROBABLE CAUSES
• Damaged wiring harness and connectors
• Improper adjustment of stop lamp switch installation position
• Malfunction of the stop lamp switch
• ETACS-ECU malfunction
• ASC-ECU malfunction
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is diagnosis code No.C1000 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Brake pedal check
Refer to GROUP 35A − On-vehicle Service/Brake
Pedal Check .
Q: Is the check result normal?
YES : Go to Step 4.
NO : Go to GROUP 35A − On-vehicle
Service/Brake Pedal Check . Then go to
Step 10.
STEP 4. Check for stop lamp switch installation
Refer to GROUP 35A − On-vehicle Service/Brake
Pedal Check .
Q: Is the check result normal?
YES : Go to Step 5.
NO : Install the stop lamp switch correctly (Refer
to GROUP 35A − On-vehicle Service/Brake
Pedal Check ), and then go to Step 10.
STEP 5. Stop lamp switch continuity check
Refer to GROUP 35A − Brake Pedal .
Q: Is the check result normal?
YES : Go to Step 6.
NO : Replace the stop lamp switch (Refer to
GROUP 35A −Brake Pedal ), and then go to
Step 10.
STEP 6. Brake drag check
Check the brake system for drag.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair the brake drag, and then go to Step
10.
STEP 7. Brake booster check
Refer to GROUP 35A − On-vehicle Service/Brake
Booster Operation Check .
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the brake booster <Refer to
GROUP 35A − Master Cylinder Assembly
and Brake Booster >, and then go to Step
10.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-42
TROUBLESHOOTING
STEP 8. M.U.T.-III other system's data list
Check the ETACS-ECU system data list.
• The brake pedal is depressed.
Item No.
290
Item name
Stop lamp
switch
Normal
condition
OFF to ON
Q: Is the check result normal?
YES : Go to Step 9.
NO : Refer to GROUP 54A − ETACS, Inspection
Procedure 12 "The stop lamp switch signal
is not received."
STEP 9. Diagnosis code recheck
Erase the diagnosis code.
Q: Is diagnosis code No.C1000 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 10.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions .)
STEP 10. Diagnosis code recheck
Erase the diagnosis code.
Q: Is diagnosis code No.C1000 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No.C123B: System control too long
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
ASC-ECU controls ASC by calculating the data sent
from the wheel speed sensor, the steering wheel
sensor, and the G and yaw rate sensor.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when ASC operates for a
prolonged period.
NOTE: This diagnosis code may be set when the
vehicle runs on a slippery or rough road.
PROBABLE CAUSES
•
•
•
•
•
Steering wheel sensor malfunction
Improper installation of steering wheel sensor
ASC-ECU malfunction
Different steering wheel
Wheel alignment not performed
DIAGNOSTIC PROCEDURE
STEP 1. Using M.U.T.-III, diagnose the CAN bus
lines.
Using M.U.T.-III, diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). After
repairing the CAN bus line, go to Step 2.
STEP 2. Diagnosis code recheck after repairing
the CAN bus line
Q: Is diagnosis code No.C123B set?
YES : Go to Step 3
NO : This diagnosis is complete.
STEP 3. M.U.T.-III diagnosis code
Check that diagnosis codes No.C100A, C1015,
C1020, C102B, C1011, C101C, C1027, C1032,
C1014, C101F, C102A, C1035, C1041, C1042,
C1043, C1044, C1219, C2205, C123C, and C2204
are also set.
Q: Are diagnosis codes No.C100A, C1015, C1020,
C102B, C1011, C101C, C1027, C1032, C1014,
C101F, C102A, C1035, C1041, C1042, C1043, C1044,
C1219, C2205, C123C, and C2204 also set?
YES : Carry out the diagnosis for the diagnosis
code that is set (Refer to P.35C-15). Then
go to Step 9.
NO : Go to Step 4
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 4. M.U.T.-III service data
Check the following data list. (Refer to P.35C-85).
• Item 08: Lateral G sensor
• Item 09: G sensor
• Item 12: Yaw rate sensor
Q: Is the check result normal?
YES : Go to Step 5
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 9.
STEP 5. Check of steering wheel sensor
installation status
Check that the steering wheel sensor is installed correctly.
Q: Is the check result normal?
YES : Go to Step 6
NO : Install the steering wheel sensor correctly
(Refer to P.35C-98). Then go to Step 6.
STEP 6. Wheel alignment check
Refer to GROUP 33 − On-vehicles service/Front
Wheel Alignment Check and Adjustment .
Q: Is the check result normal?
YES : After checking the wheel alignment, perform
the calibration of steering wheel sensor to
make ASC-ECU relearn the neutral point
(Refer to P.35C-94). Then go to Step 7.
NO : After adjusting the wheel alignment, perform
the calibration of steering wheel sensor to
make ASC-ECU relearn the neutral point
(Refer to P.35C-94). Then go to Step 7.
35C-43
STEP 7. M.U.T.-III service data
Check the following data list (Refer to P.35C-85).
• Item 11: Steering angle
Q: Is the check result normal?
YES : Go to Step 8
NO : Replace the steering wheel sensor (Refer to
P.35C-98). Then go to Step 9.
STEP 8. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Turn the steering wheel to either right or left at 20
km/h or more.
NOTE: The ASC warning/operation lamp and the
ASC OFF lamp may remain on until the vehicle
speed reaches approx. 10 km/h, then the steering wheel is turned to either right or left.
Q: Is diagnosis code No.C123B set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 9.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 9. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Turn the steering wheel to either right or left at 20
km/h or more.
NOTE: The ASC warning/operation lamp and the
ASC OFF lamp may remain on until the vehicle
speed reaches approx. 10 km/h, then the steering wheel is turned to either right or left.
Q: Is diagnosis code No.C123B set?
YES : Return to Step 1.
NO : The procedure is complete.
Code No. C2200 ECU internal error
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
ASC-ECU controls ASC by calculating the data sent
from the wheel speed sensor, the steering wheel
sensor, and the G and yaw rate sensor.
35C-44
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when ASC-ECU has malfunction.
PROBABLE CAUSES
ASC-ECU malfunction
DIAGNOSTIC PROCEDURE
Check whether the diagnosis code is reset.
Erase the diagnosis code.
Q: Is the diagnosis code No. C2200 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95).
NO : This diagnosis is complete.
Code No. C2101 Power supply high voltage
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
The ASC-ECU is energized by the valve power supply circuit (+BV terminal). When the power is supplied from the ignition switch (IG1) to the IG1 relay in
ETACS-ECU, IG1 relay is turned on. At this time, the
valve power supply circuit (IG1 terminal) energizes
the ASC-ECU.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the ASC-ECU power
supply voltage is more than 18.0 ± 1.0 V.
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No. C2101 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Battery check
Refer to GROUP 54A − Battery Test .
Q: Is the battery in good condition?
YES : Go to Step 5.
NO : Charge or replace the battery. Then go to
Step 4.
STEP 4. Charging system check
Refer to GROUP 16 − On−vehicle Service/Alternator
Output Line Voltage Drop Test .
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the charging system
component(s).
PROBABLE CAUSES
• Battery failure
• ASC-ECU malfunction
• Charging system failed
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
STEP 5. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is the diagnosis code No. C2101 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 6.
NO : The trouble can be an intermittent
malfunction (Refer to GROUP 00 − How to
Use Troubleshooting/How to Cope with
Intermittent Malfunctions ).
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
35C-45
YES : Return to Step 1.
NO : This diagnosis is complete.
STEP 6. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is the diagnosis code No. C2101 set?
Code No. C1395 Incomplete Brake fluid filling
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
PROBABLE CAUSES
• Different hydraulic unit (For delivery to factory)
• ASC-ECU malfunction
DIAGNOSIS PROCEDURE
Check whether the diagnosis code is reset.
Erase the diagnosis code.
Q: Is the diagnosis code No. C1395 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95).
NO : This diagnosis is complete.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the brake fluid is not
filled in the hydraulic unit.
Code No. C121C Torque request signal denied
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
ASC-ECU sends the signal to the engine ECU as
necessary to decrease the engine output for the ASC
system operation.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the request for the
decrease of output is rejected by the engine ECU.
PROBABLE CAUSES
•
•
•
•
Wrong coding of engine ECU
Engine ECU malfunction
ASC-ECU malfunction
External noise interference
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
35C-46
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is diagnosis code No.C121C set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. M.U.T.-III other system diagnosis code
Use M.U.T.-III to check that the diagnosis code is set
in the engine ECU.
Q: Is the diagnosis code set?
YES : Troubleshoot the engine ECU diagnosis
code (Refer to GROUP 13A −
Troubleshooting/Diagnosis function ), and
then go to Step 7.
NO : Go to Step 4.
STEP 4. M.U.T.-III diagnosis code
Check that diagnosis code No.C1707 is set in
ASC-ECU.
Q: Is diagnosis code No.C1707 set?
YES : Troubleshoot for diagnosis code No.C1707
(Refer to P.35C-59). Then go to Step 5.
STEP 5. M.U.T.-III data list
Check the following service data (Refer to
P.35C-85).
• Item 68: Allow ESP torque request
Q: Is the check result normal?
YES : Go to Step 6.
NO : Replace the engine ECU (Refer to GROUP
13A − engine ECU ), and then go to Step 7.
STEP 6. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C121C set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 7.
NO : If the trouble symptom is resolved, an
intermittent malfunction such as poorly
engaged connector(s) or wiring harness is
suspected (Refer to GROUP 00 − How to
Use Troubleshooting/How to Cope with
Intermittent Malfunctions ).
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 7.
STEP 7. Diagnosis code recheck
Erase the diagnosis code.
Q: Is diagnosis code No.C121C set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No.C2206 Re-execution of variant coding
•
•
•
•
CAUTION
If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
If diagnosis code No.C2206 is set in
ASC-ECU, always diagnose the CAN bus line.
If there is any fault in the CAN bus lines, an
incorrect diagnosis code may be set. In this
case, the set diagnosis code is not highly reliable.
Before replacing the ECU, ensure that the
communication circuit is normal.
When diagnosis code No.C2206 is set in
ASC-ECU, the diagnosis code may also be set
in ETACS-ECU. When the diagnosis code is
set in ETACS-ECU, carry out the diagnosis of
the diagnosis code for ETACS-ECU first.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
ASC-ECU receives the vehicle information stored in
the ETACS-ECU via CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
ASC-ECU communicates with ETACS-ECU via CAN
bus lines. This diagnosis code is set if the vehicle
information stored in ETACS-ECU varies from the
one stored when the ignition switch was last turned
on.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
PROBABLE CAUSES
• ETACS-ECU or ASC-ECU which was equipped
with other vehicle is used.
• Malfunction of ETACS-ECU
• ASC-ECU malfunction
• External noise interference
DIAGNOSIS PROCEDURE
35C-47
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. ETACS-ECU variant coding
Perform the variant coding to the ETACS-ECU.
Q: Dose variant coding succeed?
YES : Go to Step 6.
NO : Replace the ETACS-ECU (Refer to GROUP
54A − ETACS-ECU ), and then go to Step 6.
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 6.
STEP 2. M.U.T.-III Diagnosis code of other system
Use M.U.T.-III to check that the vehicles information-related diagnosis code is set by the
ETACS-ECU.
Q: Is the diagnosis code set?
YES : Troubleshoot the relevant diagnosis code,
and then go to Step 3.
NO : Go to Step 5.
STEP 3. ETACS-ECU coding data check
Refer to GROUP 00 − Precautions before Service/Coding List .
STEP 5. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Ignition switch "LOCK" (OFF)
(3) Ignition switch "ON"
Q: Is diagnosis code No.C2206 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 6.
NO : This diagnosis is complete.
STEP 6. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Ignition switch "LOCK" (OFF)
(3) Ignition switch "ON"
Q: Is diagnosis code No.C2206 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Q: Is the check result normal?
Code No. C1210 Longitudinal G sensor input circuit
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
• ASC-ECU monitors if the output of G and yaw
rate sensor is normal or not.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if any malfunction below is
found:
• When the output value of the longitudinal G-sensor is abnormal
PROBABLE CAUSES
• ASC-ECU malfunction
• External noise interference
35C-48
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is diagnosis code No.C1210 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. M.U.T.-III data list
Check the following data list (Refer to P.35C-85).
• Item 09: G sensor
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 5.
STEP 4. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C1210 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 5.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 5. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C1210 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C1242 Longitudinal G sensor signal
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C, Trouble code diagnosis
).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
ASC-ECU monitors if the output of G and yaw rate
sensor is normal or not.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the abnormality is
detected by comparing the longitudinal G-sensor
value output from the G and yaw rate sensor with the
value output from the wheel speed sensor.
PROBABLE CAUSES
• Malfunction of wheel speed sensor
• ASC-ECU malfunction
• External noise interference
NOTE: When rotated on the four-wheel drum tester,
this diagnosis code may be set.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No.C1242 set?
YES : Go to Step 3
NO : This diagnosis is complete.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 3. Check the wheel speed sensor-related
diagnosis code.
Use the M.U.T.-III to check whether the wheel speed
sensor-related diagnosis code is set or not.
Q: Is the diagnosis code set?
YES : Troubleshoot for the relevant diagnosis
code (Refer to P.35C-15).
NO : Go to Step 4
STEP 4. Check whether the ASC-ECU is installed
properly.
Check whether the ASC-ECU is installed correctly.
Refer to P.35C-95.
Q: Is the check result normal?
YES : Execute "G sensor calibration" on "Special
function". After the calibration is performed
(Refer to P.35C-93) , turn the ignition switch
from "OFF" to "ON".Then go to Step 5.
NO : Install the ASC-ECU properly, and execute
"G sensor calibration" on "Special function".
After the calibration is performed (Refer to
P.35C-93) , turn the ignition switch from
"OFF" to "ON".Then go to Step 5.
STEP 5. M.U.T.-III data list
Check the following data list under curb weight condition or one occupant (driver) only in the vehicle, on
a flat road (Refer to P.35C-85).
• Item 09: G sensor
• Item 96: G sensor offset
Q: Is the check result normal?
35C-49
YES : Turn the ignition switch to the "ON" from
"OFF" position. Then go to Step 6.
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 7.
STEP 6. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1242 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 7.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 7. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is the diagnosis code No.C1242 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C123C Sensor cluster malfunction
•
•
•
•
CAUTION
If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
When the steering wheel sensor is replaced,
always carry out calibration to make
ASC-ECU learn the neutral point (Refer to
P.35C-94).
When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
ASC-ECU monitors if the output of G and yaw rate
sensor is normal or not.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if any malfunction below is
found:
• The output value of lateral G and yaw rate is
abnormal.
• When abnormality is detected by comparing the
value output from the lateral G and yaw rate with
the one from the steering wheel sensor and
wheel speed sensor
35C-50
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
PROBABLE CAUSES
•
•
•
•
•
Steering wheel sensor malfunction
Improperly installed steering wheel sensor
Malfunction of wheel speed sensor
ASC-ECU malfunction
External noise interference
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 5. M.U.T.-III data list
Check the following data list (Refer to P.35C-85).
• Item 08: Lateral G sensor
• Item 12: Yaw rate sensor
Q: Is the check result normal?
YES : Go to Step 6
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 10.
STEP 6. Steering wheel sensor installation check
Check that the steering wheel sensor is installed correctly.
Q: Is the check result normal?
YES : Go to Step 7
NO : Reinstall the steering wheel sensor correctly
(Refer to P.35C-98), and then go to Step 7.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No.C123C set?
YES : Go to Step 3
NO : This diagnosis is complete.
STEP 3. Check the other sensor-related
diagnosis code.
Use M.U.T.-III to check whether the wheel speed
sensor-related or steering wheel sensor-related diagnosis code is set or not.
Q: Is the diagnosis code set?
YES : Troubleshoot for the relevant diagnosis
code (Refer to P.35C-15).
NO : Go to Step 4
STEP 4. Check whether the ASC-ECU is installed
properly.
Check whether the ASC-ECU is installed correctly.
Refer to P.35C-95.
Q: Is the check result normal?
YES : Execute "Lateral G sensor calibration" on
"Special function". After the calibration is
performed (Refer to P.35C-93) , turn the
ignition switch from "OFF" to "ON".Then go
to Step 5.
NO : Install the ASC-ECU properly, and execute
"Lateral G sensor calibration" on "Special
function". After the calibration is performed
(Refer to P.35C-93) , turn the ignition switch
from "OFF" to "ON".Then go to Step 5.
STEP 7. Wheel alignment check
Refer to .
Q: Is the check result normal?
YES : After checking the wheel alignment, carry
out calibration of steering wheel sensor to
make ASC-ECU relearn the neutral point
(Refer to P.35C-94). Then go to Step 8.
NO : After adjusting the wheel alignment, carry
out calibration of steering wheel sensor to
make ASC-ECU relearn the neutral point
(Refer to P.35C-94). Then go to Step 8.
STEP 8. M.U.T.-III data list
Check the following data list (Refer to P.35C-85).
• Item 11: Steering angle sensor
Q: Is the check result normal?
YES : Go to Step 9
NO : Replace the steering wheel sensor (Refer to
P.35C-98), and then go to Step 9.
STEP 9. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Turn the steering wheel to either right or left at 20
km/h or more.
NOTE: The ASC warning/operation lamp and the
ASC OFF lamp may remain on until the vehicle
speed reaches approx. 10 km/h, then the steering wheel is turned to either right or left.
Q: Is the diagnosis code No.C123C set?
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 10.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 10. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
35C-51
(2) Turn the steering wheel to either right or left at 20
km/h or more.
NOTE: The ASC warning/operation lamp and the
ASC OFF lamp may remain on until the vehicle
speed reaches approx. 10 km/h, then the steering wheel is turned to either right or left.
Q: Is the diagnosis code No.C123C set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C1392 Incomplete learn (Longitudinal G)
Code No. C1393 Incomplete learn neutral(Lateral G)
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
When the M.U.T.-III is operated, the ASC-ECU will
learn the neutral position of the G sensor and then
store it in its memory.
DIAGNOSIS CODE SET CONDITIONS
The ASC-ECU will store this diagnosis code when it
has not learned the neutral position of the G sensor.
PROBABLE CAUSES
• The neutral position of the G sensor has not been
learned.
• ASC-ECU malfunction
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is diagnosis code No.C1392 or C1393 set?
YES : Go to Step 3
NO : This diagnosis is complete.
STEP 3. Check the G sensor-related diagnosis
code.
Use the M.U.T.-III to check whether the G sensor-related diagnosis code is set or not.
Q: Is the diagnosis code set?
YES : Troubleshoot for the relevant diagnosis
code (Refer to P.35C-15).
NO : Go to Step 4
STEP 4. Check whether the ASC-ECU is installed
properly.
Check whether the ASC-ECU is installed correctly.
Refer to P.35C-95.
Q: Is the check result normal?
YES : Execute "Lateral G sensor calibration" and
"G sensor calibration" on "Special function".
After the calibration is performed (Refer to
P.35C-93) , turn the ignition switch from
"OFF" to "ON".Then go to Step 5.
NO : Install the ASC-ECU properly, and execute
"Lateral G sensor calibration" and "G sensor
calibration" on "Special function". After the
calibration is performed (Refer to P.35C-93)
, turn the ignition switch from "OFF" to
"ON".Then go to Step 5.
35C-52
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 5. M.U.T.-III data list
Check the following data list (Refer to P.35C-85).
• Item 08: Lateral G sensor
• Item 09: G sensor
• Item 73: Lateral G sensor offset
• Item 96: G sensor offset
Q: Is the check result normal?
YES : Go to Step 6
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 7.
STEP 6. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1392 or C1393 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 7.
NO : This diagnosis is complete.
STEP 7. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1392 or C1393 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C2204 Sensor cluster internal error
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
The ASC-ECU communicates with its integrated G
and yaw rate sensor.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code will be set when the ASC-ECU
detects an defective G and yaw rate sensor.
NOTE: This diagnosis code may be set when G and
yaw rate sensor is put on the turntable turning at high
speed.
PROBABLE CAUSES
• ASC-ECU malfunction
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No.C2204 set?
YES : Go to Step 3
NO : This diagnosis is complete.
STEP 3. Check whether the ASC-ECU is installed
properly.
Check whether the ASC-ECU is installed correctly.
Refer to .P.35C-95
Q: Is the check result normal?
YES : Execute "Lateral G sensor calibration" on
"Special function". After the calibration is
performed (Refer to P.35C-93) , turn the
ignition switch from "OFF" to "ON".Then go
to Step 4.
NO : Install the ASC-ECU properly, and execute
"Lateral G sensor calibration" on "Special
function". After the calibration is performed
(Refer to P.35C-93) , turn the ignition switch
from "OFF" to "ON".Then go to Step 4.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 4. M.U.T.-III data list
Check the following data list (Refer to P.35C-85).
• Item 08: Lateral G sensor
• Item 12: Yaw rate sensor
• Item 73: Lateral G sensor offset
• Item 97: Yaw rate sensor offset
Q: Is the check result normal?
YES : Go to Step 5
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 6.
STEP 5. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Turn the steering wheel to either right or left at 20
km/h or more.
NOTE: The ASC warning/operation lamp and the
ASC OFF lamp may remain on until the vehicle
speed reaches approx. 10 km/h, then the steering wheel is turned to either right or left.
35C-53
Q: Is the diagnosis code No.2204 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 6.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
STEP 6. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Turn the steering wheel to either right or left at 20
km/h or more.
NOTE: The ASC warning/operation lamp and the
ASC OFF lamp may remain on until the vehicle
speed reaches approx. 10 km/h, then the steering wheel is turned to either right or left.
Q: Is the diagnosis code No.2204 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C1219 Steering angle sensor signal
•
•
•
•
CAUTION
If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
When the steering wheel sensor is replaced,
always carry out calibration to make
ASC-ECU learn the neutral point (Refer to
P.35C-94).
When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
Steering wheel sensor outputs the signal to
ASC-ECU via the CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if any malfunction below is
found:
• The tolerance of neutral position of steering
wheel sensor exceeds the specified range.
• Abnormality in steering wheel sensor output
value
• When abnormality is detected by comparing the
value output from the steering wheel sensor with
the one from the wheel speed sensor and the G
and yaw rate sensor.
PROBABLE CAUSES
•
•
•
•
•
•
•
•
Improper installation of steering wheel sensor
Wheel alignment not performed
Steering wheel sensor malfunction
Different steering wheel
Malfunction of wheel speed sensor
ASC-ECU malfunction
External noise interference
Wrong steering wheel is attached
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
35C-54
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
YES : Go to Step 3
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is diagnosis code No.C1219 set?
YES : Go to Step 3
NO : This diagnosis is complete.
STEP 3. M.U.T.-III diagnosis code
Check that the wheel speed sensor-related, G and
yaw rate sensor-related, or steering wheel sensor-related diagnosis code is set.
Q: Is the diagnosis code set?
YES : Troubleshoot the relevant diagnosis code,
and then go to Step 8.
NO : Go to Step 4
STEP 4. Check how steering wheel sensor is
installed.
Check that the steering wheel sensor is installed correctly (Refer to P.35C-98).
Q: Is the check result normal?
YES : Go to Step 5
NO : Install the steering wheel sensor correctly
(Refer to P.35C-98), and then go to Step 5.
STEP 5. Wheel alignment check
Q: Is the check result normal?
YES : After the wheel alignment check, perform
the steering wheel sensor calibration to
make ASC-ECU learn the neutral point
again (Refer to P.35C-94). Then go to Step
6.
NO : After the adjustment of the wheel alignment,
perform the steering wheel sensor
calibration to make ASC-ECU learn the
neutral position again (Refer to P.35C-94).
Then go to Step 6.
STEP 6. M.U.T.-III data list
Check the following data list (Refer to P.35C-85).
• Item 11: Steering angle
Q: Is the check result normal?
YES : Go to Step 7
NO : After the steering wheel sensor is replaced,
perform the steering wheel sensor
calibration to make ASC-ECU learn the
neutral point again (Refer to P.35C-94).
Then go to Step 8.
STEP 7. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Turn the steering wheel to either right or left at 20
km/h or more.
NOTE: The ASC warning/operation lamp and the
ASC OFF lamp may remain on until the vehicle
speed reaches approx. 10 km/h, then the steering wheel is turned to either right or left.
Q: Is diagnosis code No.C1219 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 8.
NO : This diagnosis is complete.
STEP 8. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Turn the steering wheel to either right or left at 20
km/h or more.
NOTE: The ASC warning/operation lamp and the
ASC OFF lamp may remain on until the vehicle
speed reaches approx. 10 km/h, then the steering wheel is turned to either right or left.
Q: Is diagnosis code No.C1219 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
35C-55
Code No. C121A SAS initialization
•
•
•
•
CAUTION
If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
When the steering wheel sensor is replaced,
always carry out calibration to make
ASC-ECU learn the neutral point (Refer to
P.35C-94).
When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
Steering wheel sensor stores the neutral position
learned by M.U.T.-III. When the neutral position has
not been stored in the steering wheel sensor yet, the
steering wheel sensor outputs the signal indicating
that it does not have neutral position.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when ASC-ECU detects
that the steering wheel sensor has not learned the
neutral position yet.
PROBABLE CAUSES
• Neutral position of steering wheel sensor not
learned
• Steering wheel sensor malfunction
• ASC-ECU malfunction
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is diagnosis code No.C121A set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Check how steering wheel sensor is
installed.
Check that the steering wheel sensor is installed correctly (Refer to P.35C-98).
Q: Is the check result normal?
YES : Go to Step 4.
NO : Install the steering wheel sensor correctly
(Refer to P.35C-98), and then go to Step 4.
STEP 4. Steering wheel sensor calibration
Perform calibration of steering wheel sensor (Refer
to P.35C-94).
Q: Has the calibration succeeded?
YES : Go to Step 5.
NO : After the steering wheel sensor is replaced,
perform the steering wheel sensor
calibration to make ASC-ECU learn the
neutral point again (Refer to P.35C-94).
Then go to Step 5.
STEP 5. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C121A set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 6.
NO : This diagnosis is complete.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 6. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C121A set?
YES : Return to Step 1.
NO : This diagnosis is complete.
35C-56
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
Code No. C2205: SAS internal error
•
•
•
•
CAUTION
If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
When the steering wheel sensor is replaced,
always carry out calibration to make
ASC-ECU learn the neutral point (Refer to
P.35C-94).
When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 4.
STEP 2. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C2205 set?
YES : Replace the steering wheel sensor (Refer to
P.35C-98), and then go to Step 3.
NO : This diagnosis is complete.
OPERATION
Steering wheel sensor sends its status signal to
ASC-ECU.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when ASC-ECU detects
that the steering wheel sensor has malfunction.
PROBABLE CAUSES
• Steering wheel sensor malfunction
• ASC-ECU malfunction
• External noise interference
STEP 3. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C2205 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 4.
NO : This diagnosis is complete.
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C2205 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No.C2002: Valve calibration not completed
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
Perform the master cylinder pressure sensor calibration to store the calibrated value in the ASC-ECU. At
the same time, the calibrated value of cut valve and
inlet valve are stored.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the calibrated values
for cut valve and inlet valve stored in ASC-ECU are
not within the predetermined range.
PROBABLE CAUSES
• ASC-ECU malfunction
• Noise interference
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Brake fluid pressure sensor calibration
Perform calibration of brake fluid pressure sensor
calibration (Refer to P.35C-94).
35C-57
YES : Go to Step 3.
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 4.
STEP 3. diagnosis code recheck after resetting
CAN bus lines
Erase the diagnosis code.
Q: Is diagnosis code C2002 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 4.
NO : The procedure is complete.
STEP 4. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code C2002 set?
YES : Return to Step 1.
NO : The procedure is complete.
Q: Has the calibration succeeded?
Code No. C1608 EEPROM fail
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
The ASC-ECU stores diagnosis codes and failure
information in the EEPROM*.
NOTE: *:EEPROM (Electrical Erasable and Programmable ROM)
DIAGNOSIS CODE SET CONDITIONS
• This diagnosis code is set when the failure information stored in the EEPROM is not reliable. The
failure information stored in the past is not output,
and only this diagnosis code is set.
• This diagnosis code may occur when ASC-ECU
power supply shutdown or drop between
ASC-ECU is writing a data to the EEPROM.
PROBABLE CAUSES
• Disconnection of the ASC-ECU connector or the
battery terminal when the ignition switch is ON
• Loose battery terminal
• Abnormality in battery
• Damaged wiring harness and connectors
• ASC-ECU malfunction
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
35C-58
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
(2) Resistance between the GND1 terminal and the
body earth, and between the GND2 terminal and
the body earth.
OK: Continuity exists (2 Ω or less)
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the check result normal?
YES : Go to Step 9.
NO : Go to Step 8.
Q: Is diagnosis code No. C1608 set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 8. Check of open circuit in GND1, GND2
line between ASC-ECU connector and body earth
STEP 3. Battery check
Refer to GROUP 54A − Battery Test .
Q: Is the check result normal?
YES : Go to Step 9.
NO : Repair the connector(s) or wiring harness.
Q: Is the battery in good condition?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Charging system check
Refer to GROUP 16 − On−vehicle Service/Alternator
Output Line Voltage Drop Test .
Q: Is the charging system in good condition?
YES : Replace the battery. Then go to Step 9.
NO : Repair or replace the charging system
component(s).
STEP 5. Voltage measurement at the ASC-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the voltage between the +BV terminal
and the body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Check of short to power supply, short to
earth, and open circuit in +BV line between
fusible link and ASC-ECU connector
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair the fusible link, connector(s) or
wiring harness.
STEP 7. Resistance measurement at ASC-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
STEP 9. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is diagnosis code No. C1608 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
step 10.
NO : Go to step 11.
STEP 10. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is diagnosis code No. C1608 set?
YES : Return to Step 1.
NO : Go to step 11.
STEP 11. Check the other diagnosis code.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.
NOTE: The ABS warning lamp does not turn OFF
in some cases unless the vehicle runs at 20 km/h
or higher.
Q: Is any diagnosis code set?
YES : Carry out the applicable troubleshooting for
the diagnosis code (Refer to ).
NO : The procedure is complete.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
35C-59
Code No.C1707: Implausible coding data
•
•
•
•
CAUTION
If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
When diagnosis code No.C1707 is set in
ASC-ECU, the diagnosis code may also be set
in ETACS-ECU. When the diagnosis code is
set in ETACS-ECU, carry out the diagnosis of
the diagnosis code for ETACS-ECU first.
When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
ASC-ECU receives the vehicle information stored in
the ETACS-ECU via CAN bus lines.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is diagnosis code No.C1707 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. M.U.T.-III other system diagnosis code
Use M.U.T.-III to check whether any coding-related
diagnosis code is set by ETACS-ECU or
engine-ECU.
Q: Is the diagnosis code set?
YES : Troubleshoot for the relevant diagnosis
code.
NO : Go to Step 4.
STEP 4. Check part number of ASC-ECU
Check the part number of ASC-ECU.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 9.
DIAGNOSIS CODE SET CONDITIONS
When received invalid coding data from the
ETACS-ECU, this diagnosis code is set.
STEP 5. ETACS-ECU coding data check
Refer to GROUP 00 − Coding List .
PROBABLE CAUSES
Q: Is the check result normal?
YES : Go to Step 6.
NO : Replace the ETACS-ECU (Refer to GROUP
• Malfunction of ETACS-ECU
• ETACS-ECUs have been interchanged between
two vehicles.
• ASC-ECU malfunction
• ASC-ECUs have been interchanged between two
vehicles.
• Malfunction of ETACS-ECU coding data
• Engine-ECU malfunction
DIAGNOSTIC PROCEDURE
54A − ETACS-ECU ).
STEP 6. Check part number of ETACS-ECU
Check the part number of ETACS-ECU.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the ETACS-ECU (Refer to GROUP
54A − ETACS-ECU ).
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
STEP 7. Engine-ECU coding data check
Refer to GROUP 00 − Coding List .
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the engine-ECU (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 8. Check whether the diagnosis code is
reset.
13A − Engine-ECU ).
Erase the diagnosis code.
Q: Is diagnosis code No.C1707 set?
35C-60
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 9.
NO : The trouble can be an intermittent
malfunction (Refer to GROUP 00 − How to
Use Troubleshooting/How to Cope with
Intermittent Malfunctions ).
STEP 9. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.C1707 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. U0100 Engine CAN timeout
Code No. U0101 T/M CAN timeout
Code No. U0114 4WD CAN timeout
Code No. U0126 SAS CAN timeout
Code No. U0141 ETACS CAN timeout
•
•
•
•
•
•
CAUTION
If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
If diagnosis codes U0100, U0101, U0114,
U0126, and U0141 are set in ASC-ECU, always
diagnose the CAN bus line. If there is any
fault in the CAN bus lines, an incorrect diagnosis code may be set. In this case, the set
diagnosis code is not highly reliable.
Before replacing the ECU, ensure that the
communication circuit is normal.
When the steering wheel sensor is replaced,
always carry out calibration to make
ASC-ECU learn the neutral point (Refer to
P.35C-94).
When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
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 .)
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if ASC-ECU cannot
receive the signal sent from other ECU for a certain
period.
OPERATION
ASC-ECU communicates with the engine-ECU,
CVT-ECU, 4WD-ECU, steering wheel sensor, and
ETACS-ECU via the CAN bus lines.
PROBABLE CAUSES
Code No. U0100
• Wiring harness or connector failure of CAN bus
line
• Engine-ECU malfunction
• ASC-ECU malfunction
Code No. U0101
• Wiring harness or connector failure of CAN bus
line
• CVT-ECU malfunction
• ASC-ECU malfunction
Code No. U0114
• Wiring harness or connector failure of CAN bus
line
• 4WD-ECU malfunction
• ASC-ECU malfunction
Code No. U0126
• Wiring harness or connector failure of CAN bus
line
• Steering wheel sensor malfunction
• ASC-ECU malfunction
Code No. U0141
• Wiring harness or connector failure of CAN bus
line
• Malfunction of ETACS-ECU
• ASC-ECU malfunction
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
STEP 4. M.U.T.-III diagnosis code
Use M.U.T.-III to check if the same diagnosis code
(time-out) is set in the other ECU.
Q: Is any diagnosis code set?
YES (Code No. U0100 is set) : Replace the
engine-ECU, and then go to Step 5.
YES (Code No. U0101 is set) : Replace the
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 4.
CVT-ECU, and then go to Step 5.
YES (Code No. U0114 is set) : Replace 4WD-ECU,
and then go to Step 5.
YES (Code No. U0126 is set) : Replace steering
STEP 2. Check whether the diagnosis code is
reset.
wheel sensor, and then go to Step 5.
YES (Code No. U0141 is set) : Replace the
ETACS-ECU, and then go to Step 5.
NO (No diagnosis code is set.) : The procedure is
complete.
Q: Is Code No. U0100, U0101, U0114, U0126 or U0141
set?
YES : Go to Step 3.
NO : The procedure is complete.
STEP 3. M.U.T.-III other system diagnosis code
Use M.U.T.-III to check that other diagnosis code is
set in the ECU corresponding to the relevant diagnosis.
Q: Is other diagnosis code set?
YES : Troubleshoot for the relevant diagnosis
35C-61
STEP 5. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is Code No. U0100, U0101, U0114, U0126 or U0141
set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95).
NO : The procedure is complete.
code.
NO : Go to Step 4.
Code No. U0401 Engine (CAN message)
•
•
•
•
CAUTION
If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
If diagnosis code No.U0401 is set in
ASC-ECU, always diagnose the CAN bus line.
If there is any fault in the CAN bus lines, an
incorrect diagnosis code may be set. In this
case, the set diagnosis code is not highly reliable.
Before replacing the ECU, ensure that the
communication circuit is normal.
When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
Engine-related signals are sent or received to and
from between ASC-ECU and engine-ECU via CAN
bus lines.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the engine-ECU
malfunction has been detected.
PROBABLE CAUSES
•
•
•
•
Malfunction of engine system
Malfunction of engine-ECU
Malfunction of ASC-ECU
External noise interference
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
35C-62
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 5.
STEP 2. M.U.T.-III diagnosis code
Use M.U.T.-III to check that any diagnosis code other
than the code No.U0401 is set in ASC-ECU.
Q: Is the diagnosis code set?
YES : Troubleshoot the relevant diagnosis code,
STEP 4. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.U0401 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 5.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
and then go to Step 5.
NO : Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Use M.U.T.-III to check that the diagnosis code is set
by the engine-ECU.
Q: Is the diagnosis code set?
YES : Troubleshoot the relevant diagnosis code,
STEP 5. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.U0401 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
and then go to Step 5.
NO : Go to Step 4.
Code No. U0428 SAS (CAN message)
•
•
•
•
•
CAUTION
If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
If diagnosis code U0428 is set in ASC-ECU,
always diagnose the CAN bus line. If there is
any fault in the CAN bus lines, an incorrect
diagnosis code may be set. In this case, the
set diagnosis code is not highly reliable.
Before replacing the ECU, ensure that the
communication circuit is normal.
When the steering wheel sensor is replaced,
always carry out calibration to make
ASC-ECU learn the neutral point (Refer to
P.35C-94).
When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
The steering wheel sensor outputs the steering
wheel status to ASC-ECU via the CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when ASC-ECU has
detected the communication error in the steering
wheel sensor.
PROBABLE CAUSES
• Steering wheel sensor malfunction
• ASC-ECU malfunction
• External noise interference
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Replace the steering wheel sensor (Refer to
P.35C-98). Then go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 3.
STEP 2. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.U0428 set?
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95).
NO : This diagnosis is complete.
35C-63
STEP 3. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No.U0428 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. U1073 Bus-off
•
•
•
•
CAUTION
If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
If diagnosis code U1073 is set in ASC-ECU,
always diagnose the CAN bus line. If there is
any fault in the CAN bus lines, an incorrect
diagnosis code may be set. In this case, the
set diagnosis code is not highly reliable.
Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when ASC-ECU has
ceased the CAN communication (bus off).
COMMENTS ON TROUBLE SYMPTOM
Malfunction of wiring harness, connector (s), or
ASC-ECU may be present.
PROBABLE CAUSES
• Wiring harness or connector failure of CAN bus
line
• ASC-ECU malfunction
• Other ECU malfunction
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 3.
STEP 2. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No. U1073 set?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 3.
NO : If the trouble symptom is resolved, an
intermittent malfunction such as poorly
engaged connector(s) or wiring harness is
suspected (Refer to GROUP 00 − How to
Use Troubleshooting/How to Cope with
Intermittent Malfunctions ).
STEP 3. Check whether the diagnosis code is
reset.
Erase the diagnosis code.
Q: Is diagnosis code No. U1073 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
35C-64
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
Code No. U1195 Coding not completed
Code No. U1197 Coding data unavailable
•
•
•
•
CAUTION
If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
When the diagnosis code U1195 or U1197 is
set in ASC-ECU, the diagnosis code may also
be set in ETACS-ECU. When the diagnosis
code is set in ETACS-ECU, carry out the diagnosis of the diagnosis code for ETACS-ECU
first.
When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). On
completion, go to Step 2.
STEP 2. Diagnosis code recheck after resetting
CAN bus lines
Q: Is the diagnosis code No. U1195 or U1197 set?
YES : Go to Step 3.
NO : The procedure is complete.
OPERATION
STEP 3. M.U.T.-III other system diagnosis code
Use M.U.T.-III to check whether the
ETACS-ECU-related or engine ECU-related diagnosis code is set or not.
ASC-ECU receives the vehicle information stored in
the ETACS-ECU via CAN bus lines.
Q: Is any diagnosis code set?
YES : Troubleshoot for the relevant diagnosis
DIAGNOSIS CODE SET CONDITIONS
ASC-ECU communicates with ETACS-ECU via CAN
bus lines.
This diagnosis code No.U1195 is set when the variant coding for ETACS-ECU has not been implemented.
This diagnosis code No.U1197 is set when there is
difference between the vehicle information from the
ETACS-ECU and the vehicle information stored in
the ASC-ECU.
PROBABLE CAUSES
Code No.C1195 is set
• Variant coding for ETACS-ECU has not been
implemented.
• ASC-ECU malfunction
Code No.C1197 is set
• Malfunction of ETACS-ECU
• ETACS-ECU have been interchanged between
two vehicles.
• ASC-ECU malfunction
• External noise interference
• ASC-ECU have been interchanged between two
vehicles.
code.
NO : Go to Step 4.
STEP 4. Check ETACS coding data
Refer to GROUP 00 − Coding List .
Q: Is the check result normal?
YES : Go to Step 6.
NO : Go to Step 5.
STEP 5. ETACS-ECU variant coding
Perform the variant coding to the ETACS-ECU.
Q: Dose variant coding succeed?
YES : Go to Step 7.
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 7.
STEP 6. Check part number of ASC-ECU
Check the part number of ASC-ECU.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 8.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
35C-65
STEP 7. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Turn the ignition switch to the "OFF" position.
(3) Turn the ignition switch to the "ON" position.
(4) Turn the ignition switch to the "OFF" position.
(5) Turn the ignition switch to the "ON" position.
(6) Check that the ABS warning lamp goes out.
STEP 8. Check whether the diagnosis code is
reset.
(1) Erase the diagnosis code.
(2) Turn the ignition switch to the "OFF" position.
(3) Turn the ignition switch to the "ON" position.
(4) Turn the ignition switch to the "OFF" position.
(5) Turn the ignition switch to the "ON" position.
(6) Check that the ABS warning lamp goes out.
Q: Is the diagnosis code No.U1195 or U1197 set?
YES : Replace the hydraulic unit (ASC-ECU)
Q: Is the diagnosis code No.U1195 or U1197 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
(Refer to ). Then go to Step 8.
NO : The trouble can be an intermittent
TROUBLE SYMPTOM CHART
malfunction (Refer to GROUP 00 − How to
M1355006900996
Use Troubleshooting/How to Cope with
Intermittent Malfunctions ).
CAUTION
• ABS may operate in the following conditions without hard braking: Low mu road surface,
high-speed turn, and bumpy road surface. When asking the customers, confirm that they
have/have not encountered ABS operation in corresponding conditions.
• During ABS operation, the brake pedal is pulled forward gradually, and the noise occurs at the
same time. This is because the brake line pressure varies intermittently to prevent the wheel lock,
and not a system malfunction.
• During diagnosis, a diagnosis code associated with other system may be set when the ignition
switch is turned on with connector(s) disconnected. On completion, confirm all systems for diagnosis code(s). If diagnosis code(s) are set, erase them all.
Trouble symptom
Inspection Reference
procedure page
number
M.U.T.-III cannot communicate
with all systems.
−
Refer to
GROUP 54C −
Troubleshooting
.
M.U.T.-III cannot communicate
only with ASC-ECU.
1
P.35C-66
ASC OFF lamp flashes at a rate of 2Hz.
2
P.35C-66
Brake warning lamp stays ON with the parking brake lever released (ABS
warning lamp is OFF).
3
P.35C-67
ABS warning lamp does not illuminate when ignition switch is turned to the
ON position (Engine stopped).
4
P.35C-69
Brake warning lamp does not illuminate when the ignition switch is turned to 5
ON position (Engine stopped).
P.35C-70
ABS warning lamp stays ON after the engine is started.
6
P.35C-71
ASC warning lamp stays ON after the engine is started.
7
P.35C-72
ASC OFF lamp stays ON after the engine is started.
8
P.35C-73
The stability control/TCL system cannot be disabled when ASC OFF switch 9
is pressed for 3 seconds or more to turn the system OFF.
P.35C-75
Abnormality in brake operation.
P.35C-75
M.U.T.-III cannot communicate with the
ABS/ASC system is impossible.
10
35C-66
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
Trouble symptom
Inspection Reference
procedure page
number
ASC does not operate or faulty ASC operate.
11
P.35C-76
ASC-ECU power supply circuit system.
12
P.35C-77
Steering wheel sensor power supply circuit system
13
P.35C-79
ABS/stability control/TCL operates too frequently.
14
P.35C-80
HSA (Hill Start Assist) does not work.
15
P.35C-82
HSA (Hill Start Assist) works on a flat road.
16
P.35C-84
The initial check sound of hydraulic unit is loud
17
P.35C-84
SYMPTOM PROCEDURES
Inspection Procedure 1: M.U.T.-III communication with ABS/ASC system is impossible.
•
•
•
•
CAUTION
If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
If the power is supplied with the earth circuit
of CAN communication device open circuited,
an electric potential abnormality may occur to
the CAN bus lines.
When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
PROBABLE CAUSES
•
•
•
•
•
•
Damaged wiring harness and connectors
ASC-ECU malfunction
Wrong routing of M.U.T.-III harness
Abnormality in battery or alternator
Abnormality in power supply voltage to ASC-ECU
ECU malfunction of other system
M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Check the power supply circuit, and repair if
necessary (Refer to P.35C-77).
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ).
COMMENTS ON TROUBLE SYMPTOM
When M.U.T.-III cannot communicate with the
ABS/ASC system, the CAN bus lines, ASC-ECU
power supply circuit system, earth, or ASC-ECU may
be faulty.
Inspection Procedure 2: ASC OFF lamp flashes at a rate of 2Hz.
OPERATION
COMMENTS ON TROUBLE SYMPTOM
When the ASC OFF lamp flashes at a rate of 2 Hz,
the TCL control (brake control only) is prohibited.
This operation is performed for the following reasons
and is not a malfunction.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-67
TROUBLESHOOTING
• ASC-ECU calculates the estimated temperature
of the brake pad. In general, as the brake pad
temperature increases, the coefficient of friction
for the brake pad becomes smaller, resulting in
the reduced braking force. When the estimated
temperature of the brake pad reaches the specified value or more, ASC-ECU flashes the ASC
OFF lamp at a rate of 2 Hz to warn the driver that
the brake controllability by TCL is decreased by
the reduced braking force. Consequently,
ASC-ECU prohibits the TCL control (brake control only) until it determines that the estimated
temperature of the brake pad is normal.
PROBABLE CAUSES
• Overheat of brake pad
Inspection Procedure 3: Brake warning lamp stays ON with the parking brake lever released (ABS
warning lamp is OFF).
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
STEP 2. M.U.T.-III diagnosis code for other
systems.
Use M.U.T.-III to check that the diagnosis code is set
in the combination meter and ETACS-ECU.
Q: Is the diagnosis code set?
YES : Carry out the diagnosis for the diagnosis
code.
NO : Go to Step 3.
OPERATION
• When the parking brake switch is turned ON, the
combination meter (BRK terminal) is earthed, and
the brake warning lamp illuminates.
• When reduction of the brake fluid amount is
detected, the brake fluid level switch is turned
from ON to OFF. ETACS-ECU monitors the brake
fluid level switch, and instructs the combination
meter via the CAN bus line to illuminate the brake
warning lamp.
PROBABLE CAUSES
• The brake pad thickness is at the limit value or
less.
• The brake fluid amount is at the "LOWER" level
or lower.
• Poor adjustment of the parking brake lever
• Damaged wiring harness and connectors
• Parking brake switch malfunction
• Malfunction of brake fluid level switch
• Combination meter malfunction
• Malfunction of ETACS-ECU
DIAGNOSTIC PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ).
STEP 3. Brake fluid level check
Check that the brake fluid is filled up to the "MIN"
level or higher.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Brake pad check
Refer to GROUP 35A − On-vehicle Service/Brake
Pad Check .
Q: Is the check result normal?
YES : Fill the brake fluid up to the "MAX" level.
Then go to Step 5.
NO : Replace the brake pad (Refer to GROUP
35A − On-vehicle Service/Brake Pad
Replacement ). Then go to Step 14.
STEP 5. M.U.T.-III data list for other system
Check the ETACS-ECU system data list.
Item No.
Item name Normal condition
279
Brake fluid
switch
ON
Q: Is the check result normal?
YES : Go to Step 10.
NO : Go to Step 6.
35C-68
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 6. Brake fluid level switch check
Refer to GROUP 35A − On-vehicle Service/Brake
Fluid Level Switch Check .
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the reservoir tank assembly (Refer
to GROUP 35A − Master Cylinder Assembly
and Brake Booster ). Then go to Step 14.
STEP 7. Resistance measurement at brake fluid
level switch connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the resistance between the brake fluid
level switch connector (earth terminal) and the
body earth.
OK: Continuity exists (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 9.
NO : Go to Step 8.
STEP 8. Check of open circuit in earth line
between brake fluid level switch connector and
the body earth
Q: Is the check result normal?
YES : Go to Step 9.
NO : Repair the connector(s) or wiring harness.
STEP 9. Check of short to power supply, short to
earth, and open circuit in HL1+ line between
ETACS-ECU connector and brake fluid level
switch connector
Q: Is the check result normal?
YES : Replace the ETACS-ECU (Refer to GROUP
54A − ETACS-ECU ). Then go to Step 14.
NO : Repair the connector(s) or wiring harness.
STEP 10. Parking brake lever stroke check
Refer to GROUP 36 − On-vehicle Service/Parking
Brake Lever Stroke Check and Adjustment .
Q: Is the check result normal?
YES : Go to Step 11.
NO : Adjust the parking brake lever stroke (Refer
to GROUP 36 − On-vehicle Service/Parking
Brake Lever Stroke Check and Adjustment
). Then go to Step 14.
STEP 11. Parking brake switch check
Refer to GROUP 36 − On-vehicle Service/Parking
Brake Switch Check .
Q: Is the check result normal?
YES : Go to Step 12.
NO : Replace the parking brake switch (Refer to
GROUP 36 − Parking Brake Lever ). Then
go to Step 14.
STEP 12. Check of short to power supply, short
to earth, and open circuit in BRK line between
combination meter connector and parking brake
switch connector
Q: Is the check result normal?
YES : Go to Step 13.
NO : Repair the connector(s) or wiring harness.
STEP 13. Retest the system.
Q: Does the brake warning lamp turn ON and OFF
normally according to the parking brake lever
operation?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
NO : Replace the combination meter assembly
(Refer to GROUP 54A − Combination Meter
). Then go to Step 14.
STEP 14. Retest the system.
Q: Does the brake warning lamp turn ON and OFF
normally according to the parking brake lever
operation?
YES : This diagnosis is complete.
NO : Return to Step 1.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
35C-69
Inspection Procedure 4: ABS warning lamp does not illuminate when ignition switch is turned to the
ON position (engine stopped).
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Before replacing the ECU, ensure that the
communication circuit is normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
YES : Carry out the diagnosis for the diagnosis
code (Refer to P.35C-15).
NO : Go to Step 3.
STEP 3. M.U.T.-III Special Function for other
system
Perform the following special function by the combination meter system, and check if the ABS warning
lamp illuminates (Refer to GROUP 54A − Combination Meter ).
• Item 6: Indicator (AUTO)
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the combination meter.
OPERATION
• ASC-ECU sends the illumination request signal
of the ABS warning lamp to the combination
meter through ETACS-ECU via CAN communication.
• ASC-ECU illuminates the ABS warning lamp via
ETACS-ECU for approximately 3 seconds for
valve check with the ignition switch turned to the
ON position.
COMMENTS ON TROUBLE SYMPTOM
This may be caused by faults in the CAN bus line,
ETACS-ECU, combination meter or ASC-ECU.
PROBABLE CAUSES
•
•
•
•
•
Damaged wiring harness and connectors
Malfunction of ETACS-ECU
Combination meter malfunction
ASC-ECU malfunction
Malfunction of coding data for ETACS-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines. (Refer to GROUP
54C − CAN Bus Diagnostics Table .)
STEP 2. M.U.T.-III diagnosis code
Use M.U.T.-III to check the diagnosis code for the
ASC system (Refer to P.35C-15).
Q: Is the diagnosis code set?
STEP 4. ETACS-ECU coding data check
Use M.U.T.-III to check if coding data stored in
ETACS-ECU is normal (Refer to GROUP 00 − Precautions before Service/Coding List ).
Q: Is the check result normal?
YES : Go to Step 6.
NO : Go to Step 5.
STEP 5. ETACS-ECU coding data check
Perform the variant coding to the ETACS-ECU.
Q: Is the check result normal?
YES : Go to Step 9.
NO : Replace the ETACS-ECU (Refer to GROUP
54A − ETACS-ECU ), and then go to Step 9.
STEP 6. M.U.T.-III diagnosis code for other
systems
Using M.U.T.-III, check that the diagnosis code No.
U0141 is not set by the combination meter system.
Q: Is the diagnosis code set?
YES : Diagnose the combination meter (Refer to
GROUP 54A − Combination
Meter/Troubleshooting ). Then go to Step 9.
NO : Go to Step 7.
STEP 7. M.U.T.-III diagnosis code for other
systems
Using M.U.T.-III, check that the diagnosis code
No.U0121 is not set by the ETACS system.
Q: Is the diagnosis code set?
35C-70
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
YES : Troubleshoot the ETACS-ECU (Refer to
GROUP 54A −
ETACS-ECU/Troubleshooting ), and then go
to Step 9.
NO : Go to Step 8.
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunction ).
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 9.
STEP 8. Retest the system.
Q: Does the ABS warning lamp turn ON and OFF
normally?
STEP 9. Retest the system.
Q: Does the ABS warning lamp turn ON and OFF
normally?
YES : This diagnosis is complete.
NO : Return to Step 1.
Inspection Procedure 5: Brake warning lamp does not illuminate when the ignition switch is turned to
ON position (engine stopped).
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
• ASC-ECU sends the illumination request signal
of the break warning lamp to the combination
meter through ETACS-ECU via the CAN communication.
• ASC-ECU illuminates brake warning lamp via
ETACS-ECU for approximately 3 seconds for
bulb check with the ignition switch turned to the
ON position.
COMMENTS ON TROUBLE SYMPTOM
This may be caused by faults in the CAN bus line,
ETACS-ECU, combination meter or ASC-ECU.
PROBABLE CAUSES
• Damaged wiring harness and connectors
• Malfunction of ETACS-ECU
• Malfunction of the combination meter
• ASC-ECU malfunction
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines. (Refer to GROUP
54C − CAN Bus Diagnostics Table .) Then
go to Step 7.
STEP 2. M.U.T.-III diagnosis code
Use M.U.T.-III to check the diagnosis code for the
ASC system.
Q: Is the diagnosis code set?
YES : Carry out the diagnosis for the diagnosis
code (Refer to P.35C-15).
NO : Go to Step 3.
STEP 3. M.U.T.-III Special Function for other
system
Perform the following special function by the combination meter system, and check if the ABS warning
lamp illuminates (Refer to GROUP 54A − Combination Meter ).
• Item 6: Indicator (AUTO)
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the combination meter.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 4. M.U.T.-III other system diagnosis code
Using M.U.T.-III, check that diagnosis code
No.U0141 is not set by the combination meter system.
Q: Is the diagnosis code set?
YES : Diagnose the combination meter (Refer to
GROUP 54A − Combination
Meter/Diagnosis Code ). Then go to Step 7.
NO : Go to Step 5.
STEP 5. M.U.T.-III other system diagnosis code
Using M.U.T.-III, check that diagnosis code
No.U0121 is not set by the ETACS system.
Q: Is the diagnosis code set?
35C-71
YES : Perform troubleshooting on ETACS-ECU
(Refer to GROUP 54A − ETACS/Diagnosis
Code ). Then go to Step 7.
NO : Go to Step 6.
STEP 6. Retest the system.
Q: Does the brake warning lamp turn ON and OFF
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
NO : Replace the hydraulic unit (ASC-ECU)
(Refer to P.35C-95), and then go to Step 7.
STEP 7. Retest the system.
Q: Does the brake warning lamp turn ON and OFF
normally?
YES : This diagnosis is complete.
NO : Return to Step 1.
Inspection Procedure 6: ABS warning lamp stays ON after the engine is started.
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
• ASC-ECU sends the illumination request signal
of the ABS warning lamp to the combination
meter through ETACS-ECU via CAN communication.
• ASC-ECU illuminates the ABS warning lamp via
ETACS-ECU for approximately 3 seconds for
valve check with the ignition switch turned to the
ON position.
COMMENTS ON TROUBLE SYMPTOM
This may be caused by faults in the CAN bus line,
ETACS-ECU, combination meter or ASC-ECU.
PROBABLE CAUSES
• Damaged wiring harness and connectors
• Malfunction of ETACS-ECU
• Combination meter malfunction
• ASC-ECU malfunction
• Control stop due to the low voltage
NOTE: Due to the abnormality in the supply voltage,
the diagnosis code may not be set even when the
ABS warning lamp is illuminated.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). Then
go to Step 7.
STEP 2. M.U.T.-III diagnosis code
Use M.U.T.-III to check the diagnosis code for the
ASC system.
Q: Is the diagnosis code set?
YES : Carry out the diagnosis for the diagnosis
code (Refer to P.35C-15).
NO : Go to Step 3.
35C-72
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 3. Check the ASC-ECU power supply
circuit system.
Refer to P.35C-77 .
Q: Is the check result normal?
YES : Go to Step 4.
NO : Diagnose the power supply circuit of the
ASC-ECU (Refer to P.35C-77).
STEP 4. M.U.T.-III other system diagnosis code
Using M.U.T.-III, check that diagnosis code
No.U0141 is not set by the combination meter system.
Q: Is the diagnosis code set?
YES : Diagnose the combination meter (Refer to
GROUP 54A − Combination
Meter/Diagnosis Code ). Then go to Step 7.
NO : Go to Step 5.
STEP 5. M.U.T.-III other system diagnosis code
Using M.U.T.-III, check that diagnosis code
No.U0121 is not set by the ETACS system.
Q: Is the diagnosis code set?
YES : Perform troubleshooting on ETACS-ECU
(Refer to GROUP 54A − ETACS/Diagnosis
Code ). Then go to Step 7.
NO : Go to Step 6.
STEP 6. Retest the system.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 10 km/h or higher.
Q: Does the ABS warning lamp turn ON and OFF
normally?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 7.
STEP 7. Retest the system.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 10 km/h or higher.
Q: Does the ABS warning lamp turn ON and OFF
normally?
YES : This diagnosis is complete.
NO : Return to Step 1.
Inspection Procedure 7: ASC warning lamp stays ON after the engine is started.
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
ASC-ECU sends the illumination request signal of
the ASC warning lamp to the combination meter
through ETACS-ECU via the CAN communication.
COMMENTS ON TROUBLE SYMPTOM
This may be caused by faults in the CAN bus line,
ETACS-ECU, combination meter or ASC-ECU.
PROBABLE CAUSES
• Damaged wiring harness and connectors
• Malfunction of ETACS-ECU
• Combination meter malfunction
• ASC-ECU malfunction
• Control is disabled due to the low voltage
NOTE: Due to the abnormality in the supply voltage,
the diagnosis code may not be set even when the
ASC lamp illuminates.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). Then
go to Step 8.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 2. M.U.T.-III diagnosis code
Use M.U.T.-III to check the diagnosis code for the
ASC system.
Q: Is the diagnosis code set?
YES : Carry out the diagnosis for the diagnosis
code (Refer to P.35C-15).
NO : Go to Step 3.
STEP 3. M.U.T.-III Special Function for other
system
Perform the following special function by the combination meter system, and check if the ASC warning
lamp illuminates (Refer to GROUP 54A − Combination Meter ).
• Item 2: LCD (AUTO)
• Item 6: Indicator (AUTO)
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the combination meter. Then go to
Step 8.
STEP 4. Check the ASC-ECU power supply
circuit system.
Refer to P.35C-77.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Diagnose the power supply circuit of the
ASC-ECU (Refer to P.35C-77).
35C-73
STEP 5. M.U.T.-III other system diagnosis code
Using M.U.T.-III, check that diagnosis code
No.U0141 is not set by the combination meter system.
Q: Is the diagnosis code set?
YES : Diagnose the combination meter (Refer to
GROUP 54A − Combination
Meter/Diagnosis Code ). Then go to Step 8.
NO : Go to Step 6.
STEP 6. M.U.T.-III other system diagnosis code
Using M.U.T.-III, check that diagnosis code
No.U0121 is not set by the ETACS system.
Q: Is the diagnosis code set?
YES : Perform troubleshooting on ETACS-ECU
(Refer to GROUP 54A − ETACS/Diagnosis
Code ). Then go to Step 8.
NO : Go to Step 7.
STEP 7. Retest the system.
Q: Does the ASC warning lamp turn ON and OFF
normally?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95), and then
go to Step 8.
STEP 8. Retest the system.
Q: Does the ASC lamp turn ON and OFF normally?
YES : This diagnosis is complete.
NO : Return to Step 1.
Inspection Procedure 8: ASC OFF lamp stays ON after the engine is started.
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
• ASC-ECU sends the illumination request signal
of ASC OFF lamp to the combination meter
through ETACS-ECU via CAN communication.
• By the operation of ASC OFF switch, the ASC
OFF lamp illuminates when the ASC function is
stopped.
• When the ASC OFF switch is pressed for 3 seconds or more, the ASC system turns OFF.
35C-74
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
• When the ASC OFF switch is pressed for 15 seconds or more, the ASC is kept in ON state and
the system cannot be turned OFF until the ignition switch is turned to the ON position next time.
COMMENTS ON TROUBLE SYMPTOM
This may be caused by faults in the CAN bus line,
ETACS-ECU, combination meter or ASC-ECU.
PROBABLE CAUSES
•
•
•
•
Damaged wiring harness and connectors
Malfunction of ETACS-ECU
Combination meter malfunction
ASC-ECU malfunction
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). Then
go to Step 8.
STEP 2. M.U.T.-III diagnosis code
Use M.U.T.-III to check the diagnosis code for the
ASC system.
Q: Is the diagnosis code set?
YES : Carry out the diagnosis for the diagnosis
code (Refer to P.35C-15).
NO : Go to Step 3.
STEP 3. M.U.T.-III Special Function for other
system
Perform the following special function by the combination meter system, and check if the ABS warning
lamp illuminates (Refer to GROUP 54A − Combination Meter ).
• Item 2: LCD (AUTO)
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the combination meter. Then go to
Step 8.
STEP 4. M.U.T.-III data list for other system
Check the ETACS-ECU system data list.
• ASC OFF switch: During ON operation
Item No.
Item name Normal condition
281
ASC/TCL
ON
OFF switch
Q: Is the check result normal?
YES : Go to Step 5.
NO : Refer to GROUP 54A − ETACS, Inspection
Procedure 15 "The ASC OFF switch signal
is not received." .
STEP 5. M.U.T.-III diagnosis code for other
systems
Using M.U.T.-III, check that diagnosis code No.
U0141 is not set by the combination meter system.
Q: Is the diagnosis code set?
YES : Diagnose the combination meter (Refer to
GROUP 54A − Combination
Meter/Diagnosis Code ). Then go to Step 8.
NO : Go to Step 6.
STEP 6. M.U.T.-III diagnosis code for other
systems
Using M.U.T.-III, check that diagnosis code No.
U0121 is not set by the ETACS system.
Q: Is the diagnosis code set?
YES : Perform troubleshooting on ETACS-ECU
(Refer to GROUP 54A − ETACS/Diagnosis
Code ). Then go to Step 7.
NO : Go to Step 7.
STEP 7. Retest the system.
Q: Does ASC OFF lamp turn ON and OFF normally?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 8.
STEP 8. Retest the system.
Q: Does ASC OFF lamp turn ON and OFF normally?
YES : This diagnosis is complete.
NO : Return to Step 1.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
35C-75
Inspection Procedure 9: The stability control/TCL system cannot be disabled when ASC OFF switch
is pressed for 3 seconds or more to turn the system OFF.
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
OPERATION
• ETACS-ECU (ASCS terminal) is earthed by
pressing ASC OFF switch. The ON/OFF state of
ASC OFF switch is transferred from ETACS-ECU
to ASC-ECU via CAN bus line.
• When the ASC OFF switch is pressed for 3 seconds or more, the ASC system turns OFF.
• When the ASC OFF switch is pressed and held
for 15 seconds or more, ASC turns ON.
COMMENTS ON TROUBLE SYMPTOM
This may be caused by the open and short circuit in
the ASC OFF switch circuit.
PROBABLE CAUSES
• Damaged wiring harness and connectors
• ASC OFF switch malfunction
• Malfunction of ETACS-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to diagnose the CAN bus lines.
YES : Go to step2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ).
STEP 2. M.U.T.-III data list for other system
Check the ETACS-ECU system data list.
• ASC OFF switch: During ON operation
Item No.
Item name Normal condition
281
ASC/TCL
ON
OFF switch
Q: Is the check result normal?
YES : Go to Step 3.
NO : Refer to GROUP 54A − ETACS, Inspection
Procedure 15 "The ASC OFF switch signal
is not received." .
STEP 3. Retest the system.
Q: Does ASC turn ON and OFF normally using ASC
OFF switch?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunction ).
NO : Replace the ETACS-ECU (Refer to GROUP
54A − ETACS-ECU ). Then go to Step 4.
STEP 4. Retest the system.
Q: Does ASC turn ON and OFF normally using ASC
OFF switch?
YES : This diagnosis is complete.
NO : Return to Step 1.
Q: Is the check result normal?
Inspection Procedure 10: Abnormality in brake operation
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
COMMENTS ON TROUBLE SYMPTOM
Although the cause of the trouble cannot be clearly
resolved since it depends on the running status and
road surface condition, the malfunction of the
hydraulic circuit may occur if any diagnosis code is
not detected.
PROBABLE CAUSES
• Hydraulic unit (Integrated with ASC-ECU) malfunction
35C-76
•
•
•
•
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
Malfunction of hydraulic circuit
Malfunction of brake assembly
Malfunction of brake booster
Malfunction of master cylinder assembly
DIAGNOSIS PROCEDURE
STEP 1. Diagnosis code check
Use M.U.T.-III to check the diagnosis code for the
ASC system. (Refer to P.35C-15.)
Q: Is the check result normal?
YES : Go to Step 2.
NO : Troubleshoot for the relevant diagnosis
code (Refer to P.35C-15).
STEP 2. Hydraulic unit (Integrated with
ASC-ECU) check
Check that the brake tube is installed to the hydraulic
unit (integrated with ASC-ECU) correctly (Refer to
P.35C-90).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Connect the brake tubes correctly, repair the
external brake lines, or replace the hydraulic
unit (integrated with ASC-ECU) (Refer to
P.35C-95).
STEP 3. Brake operation check
Perform the following checks.
• Brake pedal check (Refer to GROUP 35A −
On-vehicle Service/Brake Pedal Check ).
• Brake booster check (Refer to GROUP 35A −
On-vehicle Service/Brake Booster Operating
Check ).
• Check valve check (Refer to GROUP 35A −
On-vehicle Service/Check Valve Operation
Check ).
Q: Can any fault be found with the brake operation?
YES : Check the brake-related parts, and repair if
necessary. Then, go to Step 4.
NO : Go to Step 4.
STEP 4. Hydraulic unit check
Perform the following actuator tests (Refer to
P.35C-87).
• Item No.01: FL wheel ABS drive
• Item No.02: FR wheel ABS drive
• Item No.03: RL wheel ABS drive
• Item No.04: RR wheel ABS drive
• Item No.05: FL wheel TCL drive
• Item No.06: FR wheel TCL drive
• Item No.07: RL wheel TCL drive
• Item No.08: RR wheel TCL drive
Q: Is the check result normal?
YES : This diagnosis is complete.
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95).
Inspection Procedure 11: ASC does not operate or faulty ASC operate.
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
COMMENTS ON TROUBLE SYMPTOM
In case of this trouble symptom, the stability control/TCL system operation may be disabled. Diagno-
sis code may be set by the stability control/TCL
system using M.U.T.-III.
PROBABLE CAUSES
• Low battery output
• Wiring harness or connector failure of CAN bus
line
• ASC-ECU malfunction
• Engine coding data problem
DIAGNOSIS PROCEDURE
STEP 1. Diagnosis code check
Use M.U.T.-III to check the diagnosis code for the
ASC system (Refer to P.35C-15).
Q: Is the check result normal?
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
YES : Go to Step 2.
NO : Carry out the diagnosis for the diagnosis
code (Refer to P.35C-15).
STEP 2. Engine ECU coding data check
Using M.U.T.-III, check if any abnormality is present
to the coding data below which are stored in the
engine-ECU (Refer to GROUP 00 − Precautions
before Service/Coding List ).
A.S.C.
OK: Available
35C-77
STEP 4. Hydraulic unit (integrated with
ASC-ECU) check
Check that the brake tube is correctly mounted to the
hydraulic unit (integrated with ASC-ECU) (Refer to
P.35C-90).
Q: Is the check result normal?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-90). Then go to
Step 5.
NO : Connect the brake tubes correctly, and
repair or replace the external brake lines of
the hydraulic unit (integrated with
ASC-ECU).
Q: Is the check result normal?
YES : Go to Step 4.
NO : Go to Step 3 .
STEP 5. Operation check
STEP 3. Engine ECU coding data check
Perform the variant coding to the Engine ECU.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Replace the engine ECU (Refer to GROUP
Q: Does stability control/TCL operate normally?
YES : This diagnosis is complete.
NO : Check the brake system related
components other than the stability
control/TCL system.
13A − Engine-ECU ). Then go to Step 5.
Inspection Procedure 12: ASC-ECU power supply circuit system.
•
•
•
•
•
CAUTION
When the ASC-ECU power supply voltage
becomes 9.7 ± 0.3 V or less, the ABS warning
lamp, ASC warning display, and ASC OFF display illuminate, and the ABS, stability control,
and TCL controls are prohibited.
If the battery terminal is not tightened properly, a dump surge may occur and the power
supply voltage may become abnormally high
for a short time.
If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
OPERATION
• ASC-ECU contains the power supply circuit (+BV
terminal) for the solenoid valve. The solenoid
valve is energized by the valve relay, which is
incorporated in ASC-ECU.
• ASC-ECU contains the power supply circuit (IG1
terminal) for ASC-ECU. When the ignition switch
(IG1) is turned ON, the voltage is applied to the
relay incorporated in ETACS-ECU to turn ON the
relay, and the power is supplied from the fusible
link.
• ASC-ECU contains the power supply circuit (+BM
terminal) for the pump motor. The pump motor is
energised by the motor switch, which is incorporated in ASC-ECU.
• When malfunction occurs in ASC-ECU power
supply, the communication with M.U.T.-III
becomes unavailable.
PROBABLE CAUSES
•
•
•
•
•
•
•
Damaged wiring harness and connectors
Fusible link malfunction
Improper tightening of battery terminal
Improper tightening of earth bolt
Battery failure
Charging system failed
ASC-ECU malfunction
35C-78
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
DIAGNOSIS PROCEDURE
STEP 1. Battery check
Refer to GROUP 54A − Battery Test .
Q: Is the battery in good condition?
YES : Go to Step 3.
NO : Charge or replace the battery. Then go to
wiring harness side.
(2) Measure the voltage between ASC-ECU
connector (+BM terminal) and body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Go to Step 8.
NO : Go to Step 7.
Step 2.
STEP 2. Charging system check
Refer to GROUP 16 − On−vehicle Service/Alternator
Output Line Voltage Drop Test .
Q: Is the charging system in good condition?
YES : Go to Step 3.
NO : Repair or replace the charging system
component(s).
STEP 3. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the ETACS-ECU.
Q: Is the diagnosis code set?
YES : Troubleshoot the ETACS. Refer to GROUP
54A - ETACS .
NO : Go to Step 4.
STEP 4. Voltage measurement at the ASC-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the voltage between ASC-ECU
connector (+BV terminal) and body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Go to Step 6.
NO : Go to Step 5.
STEP 5. Check of short to power supply, short to
earth, and open circuit in +BV line between
fusible link and ASC-ECU connector
Q: Is the check result normal?
YES : Intermittent malfunction is suspected (Refer
to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunction ).
NO : Repair the fusible link, connector(s) or
wiring harness. Then go to Step 13.
STEP 6. Voltage measurement at the ASC-ECU
connector
(1) Disconnect the connector, and measure at the
STEP 7. Check of short to power supply, short to
earth, and open circuit in +BM line between
fusible link and ASC-ECU connector
Q: Is the check result normal?
YES : Intermittent malfunction is suspected (Refer
to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunction ).
NO : Repair the fusible link, connector(s) or
wiring harness. Then go to Step 13.
STEP 8. Voltage measurement at the ASC-ECU
connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between ASC-ECU
connector (IG1 terminal) and body earth.
OK: Approximately system voltage
Q: Is the check result normal?
YES : Go to Step 10.
NO : Go to Step 9.
STEP 9. Check of short to power supply, short to
earth, and open circuit in IG1 line between
ETACS-ECU and ASC-ECU connector
Q: Is the check result normal?
YES : Intermittent malfunction is suspected (Refer
to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunction ).
NO : Repair the connector(s) or wiring harness.
Then go to Step 13.
STEP 10. Resistance measurement at ASC-ECU
connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Resistance between the ASC-ECU connector
(GND1 terminal) and the body earth, and
between the ASC-ECU connector (GND2
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
terminal) and the body earth
OK: Continuity exists (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 12.
NO : Go to Step 11.
STEP 11. Check of open circuit in GND1, GND2
line between ASC-ECU connector and body earth
Q: Is the check result normal?
YES : Intermittent malfunction is suspected (Refer
to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunction ).
NO : Repair the connector(s) or wiring harness.
Then go to Step 13.
35C-79
STEP 12. Retest the system.
Q: Is the communication with M.U.T.-III possible?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 13.
STEP 13. Retest the system.
Q: Is the communication with M.U.T.-III possible?
YES : Return to Step 1.
NO : This diagnosis is complete.
Inspection Procedure 13: Steering wheel sensor power supply circuit system
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the steering wheel sensor is replaced,
always carry out calibration to make
ASC-ECU learn the neutral point (Refer to
P.35C-94).
OPERATION
• Steering wheel sensor contains the power supply
circuit for Steering wheel sensor. The power is
supplied from the ETACS-ECU (IG11 terminal).
The power is supplied from the fusible link.
• When malfunction occurs in steering wheel sensor power supply, the communication with
M.U.T.-III becomes unavailable.
PROBABLE CAUSES
•
•
•
•
•
•
Damaged wiring harness and connectors
Fusible link malfunction
Improper tightening of battery terminal
Battery failure
Charging system failed
Steering wheel sensor malfunction
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the ETACS-ECU.
Q: Is the diagnosis code set?
YES : Troubleshoot the ETACS. Refer to GROUP
54A - ETACS .
NO : Go to Step 2.
STEP 2. Resistance measurement at steering
wheel sensor connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Resistance between the steering wheel sensor
connector (earth terminal) and the body earth
OK: Continuity exists (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 4.
NO : Go to Step 3.
STEP 3. Check of open circuit in earth line
between steering wheel sensor connector and
body earth
Q: Is the check result normal?
YES : Intermittent malfunction is suspected (Refer
to GROUP 00 − How to Use
Troubleshooting/Inspection Service Points −
How to Cope with Intermittent Malfunction ).
NO : Repair the connector(s) or wiring harness.
Then go to Step 6.
35C-80
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
YES : Intermittent malfunction (Refer to GROUP
STEP 4. Check of short to power supply, short to
earth, and open circuit in IG11 line between
steering wheel sensor connector and
ETACS-ECU connector
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair the connector(s) or wiring harness.
Then go to Step 6.
STEP 5. Retest the system.
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
NO : Replace the steering wheel sensor (Refer to
P.35C-98). Then go to Step 6.
STEP 6. Retest the system.
Q: Is the communication with M.U.T.-III possible?
YES : Return to Step 1.
NO : This diagnosis is complete.
Q: Is the communication with M.U.T.-III possible?
Inspection Procedure 14: ABS/stability control/TCL operates too frequently.
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, always diagnose the CAN
bus lines (Refer to GROUP 54C − CAN Bus
Diagnostics Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
COMMENTS ON TROUBLE SYMPTOM
• Although the cause of the trouble cannot be
clearly resolved since it depends on the running
status and road surface condition, the malfunction of the hydraulic circuit may occur if any diagnosis code is not detected.
• If wheels and tyres other than the ones with genuine specified size are mounted, the ABS/stability
control/TCL may be activated prematurely.
• If a non-genuine braking device or non-genuine
impact reduction device is mounted, the ABS/stability control/TCL may be activated prematurely.
PROBABLE CAUSES
• Mounting of wheels and tyres other than with
genuine specified size
• Tyre pressure abnormality
• Tyre wear and deterioration
• Mounting of non-genuine braking device or
impact reduction device
•
•
•
•
•
Wheel alignment abnormality
Malfunction of brake related parts
Malfunction of the wheel speed sensor
Steering wheel sensor malfunction
Malfunction of hydraulic unit (integrated with
ASC-ECU)
• Malfunction of hydraulic circuit
• External radio wave noise interference
DIAGNOSIS PROCEDURE
STEP 1. Check the wheels and the tyres.
Carry out the following check.
• Size check of wheels and tyres
• Tyre wear and deterioration statuses
• Check the tyre pressure.
NOTE: For the tyre pressure, refer to the tyre pressure label attached to the lower section of driver's
side door striker.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Correct the wheels and tyres in good
condition. Then go to Step 9.
STEP 2. Diagnosis code check
Use M.U.T.-III to check the diagnosis code for the
ASC system (Refer to P.35C-15).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Carry out the diagnosis for the diagnosis
code (Refer to P.35C-15). Then go to Step
9.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 3. Check of brake system related
components other than hydraulic unit (integrated
with ASC-ECU)
At the same time with the following checks, also
check that no parts other than the genuine parts are
mounted.
• Brake pad check (Refer to GROUP 35A −
On-vehicle Service/Brake Pad Check ).
• Brake disc runout check (Refer to GROUP 35A −
On-vehicle Service/Brake Disk Check ).
• Brake drag force check <Refer to GROUP 35A −
Front Disc Brake Assembly (Front: Standard),
(Front: Option) or GROUP 35A − Rear Disc
Brake Assembly (Rear: Vehicles with alloy made
trailing arm), (Rear: Vehicles with sheet metal
made trailing arm)>
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the part(s) having damage
or other problems. Then go to Step 9.
STEP 4. Wheel alignment check
At the same time with the following checks, also
check that no parts other than the genuine parts are
mounted.
• Front wheel alignment check (Refer to GROUP
33 − On-vehicle Service/Front Wheel Alignment
Check and Adjustment ).
• Rear wheel alignment check (Refer to GROUP
34 − On-vehicle Service/Rear Wheel Alignment
Check and Adjustment ).
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair or replace the part(s) having damage
or other problems. Then go to Step 9.
STEP 5. Wheel speed sensor check
Check that no non-genuine electronic device or no
wiring harness of other than genuine electronic
device is mounted near the wheel speed sensor (at
wheel speed detection section and wiring harness
section) (Refer to P.35C-97 <Front> or P.35C-97
<Rear>.)
Q: Is the check result normal?
YES : Go to Step 6.
NO : Remove the non-genuine electronic device
or the wiring harness of non-genuine
electronic device. Then go to Step 9.
35C-81
STEP 6. M.U.T.-III data list
Check the following data list (Refer to P.35C-85).
• Item 01: FL wheel speed sensor
• Item 02: FR wheel speed sensor
• Item 03: RL wheel speed sensor
• Item 04: RR wheel speed sensor
• Item 08: Lateral G-sensor
• Item 11: Steering angle sensor
• Item 12: Yaw rate sensor
Q: Is the check result normal?
YES : Go to Step 7.
NO (Abnormality with items 01 to 04) : Check the
installation status of corresponding wheel
speed sensor (Refer to P.35C-97 <Front> or
P.35C-97 <Rear>).
NO (Abnormality with items 08, 12) : Check the
installation status of hydraulic unit
(integrated with ASC-ECU) (Refer to
P.35C-95).
NO (Abnormality with item 11) : Check the
installation status of steering wheel sensor
(Refer to P.35C-98).
STEP 7. Hydraulic unit check
Carry out the following actuator tests, and check if
they work normally (Refer to P.35C-87).
• Item No. 01: FL wheel ABS
• Item No.02: FR wheel ABS
• Item No.03: RL wheel ABS
• Item No.04: RR wheel ABS
• Item No.05: FL wheel TCL
• Item No.06: FR wheel TCL
• Item No.07: RL wheel TCL
• Item No.08: RR wheel TCL
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 9.
STEP 8. ABS/stability control/TCL operation
check
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95). Then go to
Step 9.
35C-82
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 9. ABS/stability control/TCL operation
check
YES : This diagnosis is complete.
NO : Return to Step 1.
Q: Is the check result normal?
Inspection Procedure 15: HSA (Hill Start Assist) does not work.
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
• Malfunction of hydraulic unit (integrated with
ASC-ECU)
• Wiring harness or connector failure of CAN bus
line
• Damaged wiring harness and connectors
DIAGNOSIS PROCEDURE
STEP 1. HSA operation check
Check if the HSA works with one occupant (driver)
only in the vehicle.
Q: Is the check result normal?
YES : This diagnosis is complete.
NO : Go to Step 2.
COMMENTS ON TROUBLE SYMPTOM
• The slope gradient may be low.
• The vehicle is not completely stationary.
• A failure may have occurred in the calibration of
the G and yaw rate sensor or brake fluid pressure
sensor.
• The parking brake switch may be seized, which
causes the HSA to fail to start the operation.
• A problem (noise interference) may have
occurred in the CAN bus line, resulting in an
improper communication with ASC-ECU or each
ECU.
NOTE: .
• The HSA does not work even when the wheel
speed sensor output pulse (vehicle moved) while
the vehicle is parked.
• The HSA is affected by the loading conditions
and vehicle posture at the occurrence of phenomenon. When checking the HSA operation in
actual driving, carry out the check on the vehicle
with one occupant (driver) only.
PROBABLE CAUSES
• Calibration failure of the G and yaw rate sensor
• Calibration failure of the brake fluid pressure sensor
• Seizure of the parking brake switch
• Malfunction of wheel speed sensor
• Malfunction of ETACS-ECU
STEP 2. Parking brake check
With the parking brake not pulled, check if the brake
warning lamp is off.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Carry out Inspection procedure 3 "Brake
warning lamp stays ON with the parking
brake lever released (ABS warning lamp is
OFF)" (Refer to P.35C-67).
STEP 3. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair the CAN bus lines (Refer to GROUP
54C − CAN Bus Diagnostics Table ). Then
go to Step 9.
STEP 4. M.U.T.-III diagnosis code
Use M.U.T.-III to check the diagnosis code for the
ASC system.
Q: Is the diagnosis code set?
YES : Carry out the diagnosis for the diagnosis
code (Refer to P.35C-15).
NO : Go to Step 5.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
STEP 5. M.U.T.-III data list
Check the following data list (Refer to P.35C-85).
• Pulled up parking brake lever.
Item No.
Item name
Normal
condition
120
Parking brake
ON
switch (Input)
• The selector lever is in the "R", "D", "N" and "P"
position. <Except M/T>
Item No. Item name
Normal condition
70
Target gear
71
Actual gear
• "R"
• Selector lever:"R"
position
• "D"
• Selector lever:"D"
position
• "P"
• Selector lever:"P"
position
• "N"
• Selector lever:"N"
position
Q: Is the check result normal?
YES : Go to Step 6.
NO <Item No. 120> : Carry out the Inspection
procedure 3 "Brake warning lamp stays ON
with the parking brake lever released (ABS
warning lamp is OFF)" (Refer to P.35C-67),
and then go to Step 10.
NO <Item No. 70, 71> : Go to Step 9.
STEP 6. M.U.T.-III data list
Check the following data list under curb weight condition or one occupant (driver) only in the vehicle, on
a flat road.(Refer to P.35C-85)
• Item 09: G sensor
• Item 12: Yaw rate sensor
Q: Is the check result normal?
35C-83
YES : Go to Step 7.
NO : Carry out the calibration of the G and yaw
rate sensor (Refer to P.35C-93). Then go to
Step 9.
STEP 7. M.U.T.-III data list
Check the following data list (Refer to P.35C-85).
• Item 10: Master cylinder pressure
Q: Is the check result normal?
YES : Go to Step 8.
NO : Carry out the calibration of the brake fluid
pressure sensor (Refer to P.35C-93). Then
go to Step 10.
STEP 8. M.U.T.-III diagnosis code
Use M.U.T.-III to check that the diagnosis code is set
in the CVT-ECU.
Q: Is the diagnosis code set?
YES : Carry out the diagnosis for the diagnosis
code (Refer to GROUP - 23A −
Troubleshooting/Diagnosis Code Chart ).
NO : Go to Step 9.
STEP 9. Retest the system.
Check if the HSA works with one occupant (driver)
only in the vehicle.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/How to
Cope with Intermittent Malfunctions ).
NO : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95).
STEP 10. Retest the system.
Check if the HSA works with one occupant (driver)
only in the vehicle.
Q: Is the check result normal?
YES : This diagnosis is complete.
NO : Return to Step 1.
35C-84
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
Inspection Procedure 16: HSA (Hill Start Assist) works on a flat road.
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnosis code may be set. Prior
to this diagnosis, diagnose the CAN bus lines
(Refer to GROUP 54C − CAN Bus Diagnostics
Table ).
• Whenever ECU is replaced, ensure that the
CAN bus lines are normal.
• When the hydraulic unit (integrated with
ASC-ECU) is replaced, always carry out the
calibration of the steering wheel sensor, the G
and yaw rate sensor and brake fluid pressure
sensor (Refer to P.35C-93, P.35C-94 and
P.35C-94).
COMMENTS ON TROUBLE SYMPTOM
• A failure may have occurred in the calibration of
the G & yaw rate sensor.
• Some drivers mistake a brake dragging for HSA
operation.
• If the suspension is modified, the vehicle posture
changes, and the ASC-ECU judges that the vehicle is on a steep slope and may activate HSA.
PROBABLE CAUSES
• ASC-ECU malfunction
• Brake drag
• Damaged wiring harness and connectors
DIAGNOSIS PROCEDURE
STEP 1. HSA operation check
Check if the HSA works on a flat road with one occupant (driver) only in the vehicle.
Q: Does the HSA work on a flat road?
YES : Go to Step 2.
NO : This diagnosis is complete.
STEP 2. M.U.T.-III data list
Check the following data list (Refer to P.35C-85).
• Item 09: G sensor
Q: Is the check result normal?
YES : Go to Step 3.
NO : Carry out the calibration of the G and yaw
rate sensor (Refer to P.35C-93). Then go to
Step 4.
STEP 3. Brake drag check
Check the brake system for drag.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair the brake drag, and then go to Step
4.
STEP 4. Retest the system.
Check if the HSA works on a flat road with one occupant (driver) only in the vehicle.
Q: Does the HSA work on a flat road?
YES : Replace the hydraulic unit (integrated with
ASC-ECU) (Refer to P.35C-95).
NO : This diagnosis is complete.
Inspection Procedure 17: The initial check sound of hydraulic unit is loud.
CAUTION
When installing brake tube, match the axial
centre of flare nut and brake tube with the centre
of hole at the hydraulic unit side, and check that
the fluid does not leak.
PROBABLE CAUSES
• Improper installation of the hydraulic unit
• Improper installation of the brake tube
DIAGNOSIS PROCEDURE
COMMENT ON TROUBLE SYMPTOM
The operation sound may be decreased by reducing
the load at the rubber mount portion of the brake
tube and hydraulic unit.
DRIVING CHECK
(1) Turn the ignition switch from the "LOCK" (OFF)
position to the "ON" position.
(2) When vehicle speed reaches 10 km/h, check the
operating sound volume and compare it with that
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
of the same model.
OK: The operating sound is the same volume or less by comparing with that of the
same model.
35C-85
YES : This diagnosis is complete.
NO : Carry out adjustment for hydraulic unit
installation. (Refer to P.35C-90).
Q: Is the check result normal?
DATA LIST REFERENCE TABLE
M1355001500993
The following items of ECU input data can be read
using M.U.T.-III.
The system is normal.
Item No. Check item
Check condition
Normal condition
01
FL wheel speed sensor
Perform a test run of the vehicle.
02
FR wheel speed sensor
03
RL wheel speed sensor
The speedometer display and
the M.U.T.-III display almost
agree with each other. (During
stop: approximately 0.7km/h)
04
RR wheel speed sensor
05
Power supply voltage
07
Brake switch (input)
08
09
10
11
System voltage (10 to 18 V
ASC operable range)
The brake pedal is depressed.
ON
The brake pedal is released.
OFF
Lateral G sensor (+: left
turn, -: right turn)
Vehicle stopped (level)
-0.11 to 0.11 G
Running
-1 to 1 G
G sensor (+:
deceleration, -:
acceleration)
Vehicle stopped (level)
-0.04 to 0.04 G
Running
-1 to 1 G
Master cylinder pressure The brake pedal is depressed.
(+: pressure increase, -:
pressure decrease)
The brake pedal is released.
Steering angle (+: left
turn, -: right turn)
Increases by the amount of
the brake pedal depression.
-3 to 3 bar
Vehicle stopped (the steering wheel is -6 to 6 deg
in the neutral position)
Running
Nearly the same as the
steering wheel operation
angle <-720 to 720 deg
(ASC-ECU normal detection
value)>
Nearly the same as the
steering wheel operation
angle <-850 to 850 deg
(Sensor normal value as a
single unit)>
12
14
15
Yaw rate sensor (+: left
turn, -: right turn)
Vehicle stopped (level)
-3.6 to 3.6 deg/s
Running
-100 to 100 deg/s
Brake switch
The brake pedal is depressed.
ON
The brake pedal is released.
OFF
Emission test mode: ON
ON
Emission test mode: OFF
OFF
Emission test mode
35C-86
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
Item No. Check item
Check condition
Normal condition
45
When the steering wheel sensor
neutral point is learned
Comp
When the steering wheel sensor
neutral point is not learned
Not Comp
When the steering wheel sensor is
defective
SAS fail
When the accelerator pedal is
depressed (engine started)
The tachometer display and
the M.U.T.-III display almost
agree with each other.
SAS OK flag
SAS fail&No Comp
65
Engine Speed
66
Engine torque
Displays the engine torque.
67
APS
Displays the accelerator pedal
opening angle.
68
Allow ESP torque request
Allow
70
Target gear
71
Actual gear
72
Master cylinder pressure The difference between the neutral
offset
position that was input to the
ASC-ECU before the master cylinder
pressure sensor calibration and the
neutral position after the calibration.
-8 to 8 bar
73
Lateral G sensor offset
The difference between the neutral
position that was input to the
ASC-ECU before the G and yaw rate
sensor calibration and the neutral
position after the calibration.
-0.15 to 0.15 G
74
Steering angle offset
The difference between the neutral
position that was input to the
ASC-ECU before the steering wheel
sensor calibration and the neutral
position after the calibration.
-10 to 10 deg
86
Ignition switch
Ignition switch: ON
ON
87
Ignition switch (input)
Ignition switch: ON
ON
88
Vehicle speed
Perform a test run of the vehicle.
The speedometer display and
the M.U.T.-III display almost
agree with each other.
91
Brake pressure sensor
The brake pedal is depressed.
ON
The brake pedal is released.
OFF
When the selector lever is operated
Displays the selector lever
position.
96
G sensor offset
The difference between the neutral
position that was input to the
ASC-ECU before the G and yaw rate
sensor calibration and the neutral
position after the calibration.
-0.1 to 0.1 G
97
Yaw rate sensor offset
The difference between the neutral
position that was input to the
ASC-ECU before the G and yaw rate
sensor calibration and the neutral
position after the calibration.
-6.0 to 6.0 deg/s
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
Item No. Check item
Check condition
105
Power supply voltage (input)
120
Parking brake switch
(Input)
Normal condition
System voltage (10 to 18 V
ASC operable range)
When the parking brake lever is pulled ON
up:
When the parking brake lever is
released:
OFF
A.S.C./TCL off switch
(input)
The ASC OFF switch is pressed.
ON
The ASC OFF switch is not operated.
OFF
138
ESS request
Not used.
139
Idle stop
Not used.
140
A.S.C./TCL mode
(S-AWC)
When the ASC is activated
ASC ON
When the ASC is deactivated by the
ASC OFF switch.
ASC OFF
When the ASC fails
N/A
128
35C-87
NOTE: While ASC-ECU is disabled by the diagnostic function, the M.U.T.-III displayed data is different from
the actual measurement.
ACTUATOR TEST TABLE
M1355001600558
Using M.U.T.-III, the following actuators can be forcibly operated:
NOTE: .
• ABS and ASC are operated by ASC-ECU.
• When ASC-ECU is disabled due to the fail-safe
function, the actuator test cannot be performed.
• The actuator test can be performed only when
the vehicle is stationary.
• While the actuator test is performed, the ABS
warning lamp flashes at a rate of 2 Hz.
• While the actuator test is performed, the ASC
warning display and ASC OFF display illuminate.
• After the actuator test has been performed, the
brake warning lamp, ABS warning lamp, ASC
operation display, and ASC OFF display illuminate until the ignition switch is turned to ON again
or the communication between M.U.T.-III and
ASC-ECU is terminated.
Actuator test specifications
Item No.
Check item
Driven component
01
FL wheel ABS drive
02
FR wheel ABS drive
03
RL wheel ABS drive
Solenoid valve for the corresponding
channel of the hydraulic unit and pump
motor (simplified inspection mode)
04
RR wheel ABS drive
05
FL wheel TCL drive
06
FR wheel TCL drive
07
RL wheel TCL drive
08
RR wheel TCL drive
35C-88
ACTIVE STABILITY CONTROL SYSTEM (ASC)
TROUBLESHOOTING
Item No.
Check item
Driven component
09
Engine TCL drive
Outputs the engine torque control signal
(engine torque = 0 N⋅m) to the engine
ECU for three seconds.
10
ESS test mode
Not used.
Operation pattern of items 01 to 08
M.U.T.-III actuator test
(Item No.05, 06, 07, 08) start
Increase in pressure
Cut valve,
Suction valve
(TCL)
End
Steady pressure
Reduction in pressure
M.U.T.-III actuator test
(Item No.01, 02, 03, 04) start
End
Increase in pressure
Solenoid valve
(ABS)
Steady pressure
Reduction in pressure
Drive
Pump motor
Stop
Approx. 0.05
second
1second
2 seconds
Approx. 0.01
second
AC400776 AJ
CHECK AT ECU TERMINALS
M1355001700748
TERMINAL VOLTAGE CHECK
1. Operate the lock lever to disconnect the
ASC-ECU harness connector as shown in the
figure.
2. Disconnect the ASC-ECU connector, and
measure the voltages between earth terminal
No.13 or No.38 and each respective terminal.
3. The terminal layout is shown in the illustration.
Lock lever
ACB04918AB
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-89
TROUBLESHOOTING
ACB05853
Termin Terminal Check item
al No.
code
Checking requirements
Normal condition
1
+BM
Motor power supply
Always
Battery voltage
2−5
−
−
−
−
6
IG1
ASC-ECU power supply(IG1) Ignition switch: "ON"
Battery voltage
Ignition switch: "OFF"
1 V or less
7−9
−
−
−
−
10
CANL
CAN bus line
−
−
11
CANH
CAN bus line
−
−
12
−
−
−
−
13
GND1
Earth
Always
1 V or less
14−24
−
−
−
−
25
+BV
Solenoid valve power supply
Always
Battery voltage
26
FR-
Wheel speed sensor (FR)
signal
Drive vehicle
Approximately
system voltage
27
FR+
Wheel speed sensor (FR)
power supply
Ignition switch: "ON"
Approximately
system voltage
28
−
−
−
−
29
RL+
Wheel speed sensor (RL)
power supply
Ignition switch: "ON"
Approximately
system voltage
30
RL-
Wheel speed sensor (RL)
signal
Drive vehicle
Approximately
system voltage
31, 32
−
−
−
−
33
RR-
Wheel speed sensor (RR)
signal
Drive vehicle
Approximately
system voltage
34
RR+
Wheel speed sensor (RR)
power supply
Ignition switch: "ON"
Approximately
system voltage
35
−
−
−
−
36
FL+
Wheel speed sensor (FL)
power supply
Ignition switch: "ON"
Approximately
system voltage
37
FL-
Wheel speed sensor (FL)
signal
Drive vehicle
Approximately
system voltage
38
GND2
Earth
Always
1 V or less
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-90
ON-VEHICLE SERVICE
CONTINUITY CHECK AT WIRING
HARNESS-SIDE CONNECTOR
1. Operate the lock lever to disconnect the
ASC-ECU harness connector as shown in the
figure.
2. Check the resistance and continuity between the
terminals indicated in the table below.
3. The terminal layout is shown in the illustration.
Lock lever
ACB04918AB
ACB05853
Terminal No.
Signal
Normal condition
13 − body earth
Earth
Continuity exists (2 Ω or
less)
38 − body earth
Earth
Continuity exists (2 Ω or
less)
ON-VEHICLE SERVICE
WHEEL SPEED SENSOR OUTPUT
CURRENT MEASUREMENT
M1355027300029
Refer to GROUP 35B − Wheel speed sensor output
current measurement .
HYDRAULIC UNIT (HU) CHECK
M1355006100332
1. Raise the vehicle using a jack and support the
specified points with a rigid rack.
CAUTION
Before connecting or disconnecting M.U.T.-III,
always turn the ignition switch to the LOCK
(OFF) position.
2. Before setting M.U.T.-III, turn the ignition key to
the LOCK (OFF) position.
3. Confirm that the selector lever is in the "N"
position, and then start the engine.
4. When carrying out the actuator tests No.01 to 04,
perform the actuator tests using M.U.T.-III while
depressing the brake pedal. When carrying out
the actuator tests No.05 to 08, perform the
actuator tests using M.U.T.-III without depressing
the brake pedal. When carrying out the actuator
tests, rotate the wheel by hands to confirm that
the braking force changes.
NOTE: .
• While performing the actuator test, the ABS
warning lamp flashes at a rate of 2 Hz.
• When ASC-ECU is disabled due to the
fail-safe function, the M.U.T.-III actuator test
cannot be performed.
• After the actuator test has been performed,
the ABS warning lamp, brake waning lamp,
ASC ON indicator lamp, and ASC OFF indicator lamp illuminate until the ignition switch is
turned to ON again or the communication
between M.U.T.-III and ASC-ECU is terminated.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-91
ON-VEHICLE SERVICE
M.U.T.-III actuator test
(No.01, 02, 03, 04)
Depressed
Pedal operation
Released
M.U.T.-III actuator test
(No.05, 06, 07, 08)
M.U.T.-III actuator test
(No.01, 02, 03, 04) start
Increase in pressure
Solenoid valve position
Approx.
2 seconds
Steady pressure
Reduction in pressure
Approx.
1 second
M.U.T.-III actuator test
(No.05, 06, 07, 08) start
Increase in pressure
Cut valve, suction valve
position
Steady pressure
Approx.
1 second
Approx.
2 seconds
Reduction in pressure
M.U.T.-III actuator test
(No.01, 02, 03, 04)
Lock
Checking the brake force
Drag force when the pedal is free
Approx.
3 seconds
M.U.T.-III actuator test
(No.05, 06, 07, 08)
Those with a braking effort
Approx.
3 seconds
Checking the brake force
Those without a braking effort
5. This is indicated as shown in the above.
AC400780AB
6. When any malfunction has been found, take a
necessary action according to the "Judgement
Table."
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-92
ON-VEHICLE SERVICE
Judgement Table
Display on
M.U.T.-III
Operation
Test result
Judgem Cause
ent
01 FL wheel
ABS
02 FR wheel
ABS
03 RL wheel
ABS
04 RR wheel
ABS
• Depress the brake
pedal to lock the
wheel.
• Select the vehicle
to be inspected
using M.U.T.-III,
perform the
actuator test.
• Rotate the selected
wheel by hands to
confirm the braking
force.
Braking force
Normal
decreases for 3
seconds from
the lock status.
−
−
The wheel
does not lock
even if the
brake pedal is
depressed.
Clogged brake line
other than hydraulic
unit
Check and
clean the brake
line.
Clogged hydraulic
circuit in the hydraulic
unit
Replace the
hydraulic unit
assembly.
Faulty routing of
hydraulic unit brake
tube
Route the
brake tube
correctly.
Error
Braking force
does not
decrease.
Measure
Malfunction of
Replace the
hydraulic unit solenoid hydraulic unit
valve operation
assembly.
05 FL wheel
TCL
06 FR wheel
TCL
07 RL wheel
TCL
08 RR wheel
TCL
• Select the vehicle
to be inspected
using M.U.T.-III,
perform the
actuator test.
• Rotate the selected
wheel by hands to
confirm the braking
force.
Lock condition Normal
occurs for 3
seconds from
the status
without braking
force.
−
The wheel
does not lock.
• Faulty routing of
Check and
hydraulic unit brake clean the brake
tube
line.
• Clogged brake line
other than hydraulic
unit
Error
Clogged hydraulic
circuit in the hydraulic
unit
7. After the inspection, turn the ignition switch to the
LOCK (OFF) position, and then disconnect
M.U.T.-III.
Hydraulic unit installation adjustment
Operate the pre-removal steps for the hydraulic unit.
(Refer to P.35C-95.)
1. Remove all brake tubes.
2. Loosen the mounting bolt and nut of the hydraulic
unit bracket.
3. Install all brake tubes temporarily.
−
Replace the
hydraulic unit
assembly.
4. Shake hydraulic unit to all directions with both
hands to make the hydraulic unit bracket insulator
fit with the unit.
5. Install the hydraulic unit bracket with mounting
bolt and nut not to load the brake tube.
6. Install all brake tubes securely.
NOTE: Install the flare nut taking care not to let
the brake tube turn together.
7. Operate the post-installation steps of the hydraulic
unit. (Refer to P.35C-95.)
ACTIVE STABILITY CONTROL SYSTEM (ASC)
ON-VEHICLE SERVICE
MEASURES FOR DISCHARGED
BATTERY
M1355006200102
CAUTION
Because the vehicle posture when applying the
brakes becomes unstable, do not leave ABS/ASC
disabled (for example, ASC-ECU connector disconnection).
When starting the engine using a booster cable with
the battery fully discharged, if you begin driving the
vehicle before the battery is fully charged, the engine
misfire may occur and you cannot start the vehicle.
This is because ABS/ASC consumes more electric
current to perform the self-check. In this case,
charge the battery fully.
ALL SENSOR CALIBRATION (G AND YAW
RATE SENSOR, STEERING WHEEL
SENSOR, BRAKE FLUID PRESSURE
SENSOR)
M1357003900034
CAUTION
Before carrying out the calibration, check that
the diagnosis code related to the steering wheel
sensor, G and yaw rate sensor, or brake fluid
pressure sensor is not set.
CAUTION
When the next operation has been completed,
carry out the calibration to make ASC-ECU learn
the neutral point of the steering wheel sensor, G
and yaw rate sensor, and brake fluid pressure
sensor.
• ASC-ECU replacement
CAUTION
Carry out the calibration under the following conditions.
• The vehicle has one occupant (driver) only.
• Turn the steering wheel to set the wheels in
the straight-ahead positions.
• The brake pedal is not depressed. (The stop
lamp switch is OFF.)
1. Park the vehicle on a level surface.
35C-93
CAUTION
Before connecting or disconnecting M.U.T.-III,
always turn the ignition switch to the LOCK
(OFF) position.
2. Before setting M.U.T.-III, turn the ignition key to
the LOCK (OFF) position.
3. Turn the ignition switch to the ON position.
4. Select "ABS/ASC/ASTC/WSS."
5. Select "Special function."
6. Select "Sensor calibration."
7. Select "All sensor calibration."
8. Before removing M.U.T.-III from the vehicle, turn
the ignition key to the LOCK (OFF) position.
G AND YAW RATE SENSOR
CALIBRATION
M1355009300324
CAUTION
Before performing calibration, check that the G
and yaw rate sensor-related diagnosis code is
not set.
CAUTION
After the next operation has been completed,
carry out the calibration to make ASC-ECU learn
the neutral position of the G and yaw rate sensor.
• ASC-ECU replacement
1. Park the vehicle on a level surface.
CAUTION
Before connecting or disconnecting M.U.T.-III,
always turn the ignition switch to the LOCK
(OFF) position.
2. Before setting M.U.T.-III, turn the ignition key to
the LOCK (OFF) position.
3. Turn the ignition switch to the ON position.
4. Select "ABS/ASC/ASTC/WSS."
5. Select "Special function."
6. Select "Sensor calibration."
7. Select "Lateral G sensor calibration."
8. Select "G sensor calibration."
9. Before removing M.U.T.-III from the vehicle, turn
the ignition key to the LOCK (OFF) position.
35C-94
ACTIVE STABILITY CONTROL SYSTEM (ASC)
ON-VEHICLE SERVICE
STEERING WHEEL SENSOR
CALIBRATION
M1355009200349
CAUTION
After the next operation has been completed,
carry out the following two operations:
1. Update the neutral position stored in the
steering wheel sensor.
2. Reset the calibrated value of the steering
angle stored in ASC-ECU.
• Alignment adjustment <Front>
• Steering wheel sensor (column switch assembly) replacement, removal, installation
• ASC-ECU replacement
CAUTION
• Before performing the calibration, check if the
steering wheel sensor-related diagnosis code
is set in ASC-ECU.
• When the diagnosis code other than C121A is
set, carry out inspection according to each
troubleshooting procedure.
1. Park the vehicle on a level surface with tyres and
steering wheel positioned in a straight ahead
direction.
CAUTION
Before connecting or disconnecting M.U.T.-III,
always turn the ignition switch to the LOCK
(OFF) position.
2. Before setting M.U.T.-III, turn the ignition key to
the LOCK (OFF) position.
3. Ignition switch: ON
4. Select "Steering angle sensor."
5. Select "Special function."
6. Select "SAS Calibration."
7. Select and run "SAS Initialization." (Reusable
parts only)
NOTE: .
• Since the neutral position stored in the steering wheel sensor is no longer available, "SAS
Initialization" is displayed.
• Since a new steering wheel sensor has no
neutral position, "SAS Calibration" is displayed.
8. Select and run "SAS Calibration."
9. Exit "Steering angle sensor" menu, and then
select "ABS/ASC/ASTC/WSS."
10.Select "Special function."
11.Select "Sensor calibration."
12.Select and run "SAS calibration."
13.Check whether the ASC-ECU-related diagnosis
code is set.
14.Erase the diagnosis code.
NOTE: Erase the diagnosis code C121A.
15.Before removing M.U.T.-III from the vehicle, turn
the ignition key to the LOCK (OFF) position.
BRAKE FLUID PRESSURE SENSOR
CALIBRATION
M1355024100189
CAUTION
Before performing calibration, check that the
brake fluid pressure sensor-related diagnosis
code is not set.
CAUTION
After the next operation has been completed,
carry out the calibration to make ASC-ECU learn
the neutral position of the brake fluid pressure
sensor.
• ASC-ECU replacement
CAUTION
Always perform the calibration with the brake
pedal released (stop lamp switch is turned off).
1. Park the vehicle on a level surface.
CAUTION
Before connecting or disconnecting M.U.T.-III,
always turn the ignition switch to the LOCK
(OFF) position.
2. Before setting M.U.T.-III, turn the ignition key to
the LOCK (OFF) position.
3. Turn the ignition switch to the ON position.
4. Select "ABS/ASC/ASTC/WSS."
5. Select "Special function."
6. Select "Sensor calibration."
7. Select "M/C pressure calibration."
8. Before removing M.U.T.-III from the vehicle, turn
the ignition key to the LOCK (OFF) position.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-95
ASC OFF SWITCH
ASC OFF SWITCH
REMOVAL AND INSTALLATION
M1355020100314
1
2
NOTE:
:Clip positions
ACB05025AB
1.
•
5.
Removal steps
Side air outlet
ASC OFF switch connector
connection
ASC OFF switch
INSPECTION
1. As shown in the figure, connect the circuit tester
to the ASC OFF switch as a single unit.
2. Check the continuity status when the ASC OFF
switch is pressed and when the switch is
released.
Item
When the ASC When the ASC
OFF switch is
OFF switch is
released (Not
pressed
being operated)
Continuity
between
terminal No. 2
and No. 5
No continuity
Continuity
between
terminal No. 3
and No. 4
Continuity exists Continuity exists
M1355020200270
ASC OFF SWITCH CONTINUITY CHECK
ACB05911
HYDRAULIC UNIT
REMOVAL AND INSTALLATION
M1355005600903
NOTE: ASC-ECU is located in the hydraulic unit.
Continuity exists
(2 Ω or less)
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-96
HYDRAULIC UNIT
CAUTION
When the hydraulic unit (integrated with ASC-ECU) is replaced, after turning the ignition switch ON or
OFF (vehicle information from ETACS-ECU is registered), always carry out the calibration of all sensors (steering wheel sensor, G and yaw rate sensor, and brake fluid pressure sensor) at one time.(
Refer to P.35C-93.)
Pre-removal operation
• Brake fluid draining.
Post-installation operation
• Brake fluid refilling and air bleeding (Refer to GROUP 35A
− On-vehicle Service, Bleeding ).
• Hydraulic unit check (Refer to P.35C-90).
5
5
2
6
5
16 ± 3 N·m
5
9
10
1
3
8
5
10 ± 2 N·m
11
13 ± 2 N·m
7
4
24 ± 4 N·m
ACB06014AB
>>A<<
<<B>>
Removal steps
1. ASC-ECU harness connector
2. Suction pipe installation bolt
3. Wheel speed sensor harness
connector connection
4. Wheel speed sensor harness clip
connection
5. Brake tube connection
6. Brake tube and clip connection
7. Suction pipe, liquid pipe and clip
connection
8. Hydraulic unit (ASC-ECU) and
hydraulic unit bracket
9. Hydraulic unit (ASC-ECU)
10. Hydraulic unit bracket insulator
11. Hydraulic unit bracket B
REMOVAL SERVICE POINTS
<<A>> ASC-ECU HARNESS CONNECTOR
DISCONNECTION
Lock lever
ACB04918AB
Operate the lock lever to disconnect the ASC-ECU
harness connector as shown in the figure.
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-97
WHEEL SPEED SENSOR
<<B>> HYDRAULIC UNIT (ASC-ECU)
REMOVAL
•
•
•
•
CAUTION
Be careful when removing the hydraulic unit
because it is heavy.
Never loosen the nuts and the bolts because
the hydraulic unit cannot be disassembled.
Do not drop or shock the hydraulic unit.
Do not turn the hydraulic unit upside down or
lay down the unit because the inner air
becomes difficult to be bled.
INSTALLATION SERVICE POINT
>>A<< BRAKE TUBE CONNECTION
4
5
3
6
2
1
ACB05953AB
Install the brake pipe to the hydraulic unit as shown
in the figure.
1. From master cylinder (primary) <Marking colour:
Blue>
2. From master cylinder (secondary) <Marking colour: Yellow>
3. To front brake (RH)
<Marking colour: Orange>
4. To front brake (LH)
<Marking colour: Red>
5. To rear brake (LH) <Marking colour: Pink>
6. To rear brake (RH) <Marking colour: White>
WHEEL SPEED SENSOR
REMOVAL AND INSTALLATION <FRONT>
M1355005300593
Refer to GROUP 35B, Wheel speed sensor removal
and installation <FRONT> .
REMOVAL AND INSTALLATION <REAR>
M1355005300601
Refer to GROUP 35B, Wheel speed sensor removal
and installation <REAR> .
INSPECTION
M1352008400761
Refer to GROUP 35B, Wheel speed sensor inspection .
ACTIVE STABILITY CONTROL SYSTEM (ASC)
35C-98
STEERING WHEEL SENSOR
STEERING WHEEL SENSOR
REMOVAL AND INSTALLATION
M1355005100726
CAUTION
• Be sure to remove the clock spring from the column switch and centre the clock spring to prevent
the damage of steering wheel sensor.
• If the centre of the clock spring is not correctly aligned, the steering wheel may not be turned fully
or the cable inside the clock spring may be broken, causing the SRS air bag to be inoperative or
operated incorrectly.
• Before removing the steering wheel/air bag module assembly, refer to GROUP 52B − Service Precautions and Air Bag Module Clock Spring .
• When the steering wheel sensor is replaced or installed, always carry out calibration to make
ASC-ECU learn the neutral point (Refer to P.35C-94).
• After adjusting the wheel alignment, always carry out calibration of the steering wheel sensor to
make ASC-ECU learn the neutral point. (Refer to P.35C-94.)
Pre-removal operation
• Position the front wheels in a straight ahead direction.
Post-installation operation
• Perform steering wheel sensor calibration (Refer to
P.35C-94).
1
1
2
NOTE
: Claw positions
ACA00066 AB
<<A>>
>>A<<
Removal steps
1. Clock spring (Refer to GROUP
52B − Driver’s Air Bag Module
and Clock Spring ).
2. Steering wheel sensor
REMOVAL SERVICE POINT
<<A>> STEERING WHEEL SENSOR
REMOVAL
Disengage the claws of the clock spring one by one
in a clockwise or anti-clockwise direction. Remove
the steering wheel sensor from the clock spring.
INSTALLATION SERVICE POINT
>>A<< STEERING WHEEL SENSOR
INSTALLATION
CAUTION
Install the steering wheel sensor with its rotating part removed. If the rotating part is rotated
360°, a failure occurs in calibration and ASC system.
Insert the protrusion of the clock spring into the hole
of the steering wheel sensor. Securely fit the protrusion of the steering wheel sensor into the groove of
the clock spring to install the steering sensor.
NOTE: A new steering wheel sensor has a pin for
preventing the rotation of (fixing) the steering wheel
sensor. After installing the column switch assembly,
remove this pin.
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