27C - Электронное управление полным приводом

27C - Электронное управление полным приводом
27C-1
GROUP 27C
ELECTRONICALLY
CONTROLLED 4WD
CONTENTS
SERVICE PRECAUTIONS. . . . . . . . .
SERVICE SPECIFICATIONS. . . . . . .
SEALANT. . . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS. . . . . . . . . . . . . . . .
TROUBLESHOOTING . . . . . . . . . . . .
27C-3
Code No.C1613: 4WD Mode Switch Stuck .
27C-3
Code No.C1614: Parking Brake Switch Stuck On
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27C-19
27C-3
27C-4
27C-6
27C-18
Code No.C1616: Cranking Signal Stuck . . .
27C-20
Code No.C1621: 4WD Actuator Protection .
27C-21
Code No.C1624: 4WD-ECU Internal . . . . . .
27C-22
Code No. C1626: 4WD Voltage Failure. . . .
27C-22
Code No. C1628: 4WD Current Failure . . . .
27C-23
Code No. C1629: ASC Timeout <ASC> . . .
27C-24
STANDARD FLOW OF DIAGNOSTIC
TROUBLESHOOTING . . . . . . . . . . . . . . . .
27C-6
Code No. C1630: Steering Wheel Sensor Timeout
<ASC> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27C-24
PRECAUTIONS FOR DIAGNOSIS. . . . . . .
27C-6
Code No. C1631: ETACS Timeout . . . . . . .
27C-25
CHECK OF DRIVE MODE INDICATORS. .
27C-7
Code No. C1632: Engine Timeout. . . . . . . .
27C-26
DIAGNOSTIC FUNCTION . . . . . . . . . . . . .
27C-7
Code No. C1633: T/M Timeout . . . . . . . . . .
27C-26
FREEZE FRAME DATA REFERENCE TABLE
......................................
27C-7
Code No.C1707: Implausible Coding Data .
27C-27
Code No.C2100: Power supply low voltage
27C-28
DIAGNOSIS CODE CHART . . . . . . . . . . . .
27C-8
DIAGNOSIS CODE PROCEDURES . . . . .
27C-10
Code No.C2101: Power supply high voltage
......................................
27C-29
Code No.C100A <FL>, C1015 <FR>, C1020 <RL>,
C102B <RR>: Wheel Speed Sensor Circuit 27C-10
Code No.C2205: Steering Wheel Sensor Internal Error
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27C-30
Code No.C1011 <FL>, C101C <FR>, C1027 <RL>,
C1032 <RR>: Wheel Speed Sensor Signal
27C-11
Code No.U0100: Engine CAN Timeout . . . .
27C-31
Code No.U0101: T/M CAN Timeout . . . . . .
27C-32
Code No.C1014 <FL>, C101F <FR>, C102A <RL>,
C1035 <RR>: Wheel Speed Sensor Performance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27C-11
Code No.U0121: ABS/ASC CAN Timeout. .
27C-32
Code No.C1078: Tyre Revolutions Range .
27C-12
Code No.C1219: Steering Wheel Sensor Signal <ASC>
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27C-13
Code No.C121A: Steering Wheel Sensor Initialization
<ASC> . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27C-14
Code No.U0126: Steering Wheel Sensor CAN Timeout
<ASC> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27C-33
Code No. U0141: ETACS CAN Timeout . . .
27C-34
Code No.U0401: Engine CAN Message . . .
27C-35
Code No.U0428: Steering Wheel Sensor CAN
Message <ASC> . . . . . . . . . . . . . . . . . . . . . 27C-35
Code No.U0431: ETACS CAN Message. . .
27C-36
Code No.U1073: Bus-Off. . . . . . . . . . . . . . .
27C-37
27C-17
Code No.U1195: Coding not Completed . . .
27C-37
Code No.C1610: 4WD Actuator Power Supply Relay
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27C-18
Code No.U119A: Chassis No. mismatch. . .
27C-38
Code No.U1425: T/M CAN Message . . . . .
27C-39
Code No.C123C: Sensor Cluster Malfunction <ASC>
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27C-15
Code No.C1242: Straight G Sensor Signal.
27C-2
Code No.U1427: Implausible Wheel Speed Data
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27C-40
Code No.U1428: Sensor Cluster CAN Message <ASC>
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27C-40
SPECIAL FUNCTION . . . . . . . . . . . . . . . . .
27C-48
CHECK AT ECU TERMINALS . . . . . . . . . .
27C-48
ON-VEHICLE SERVICE . . . . . . . . . . . 27C-49
TROUBLE SYMPTOM CHART. . . . . . . . . .
27C-41
SYMPTOM PROCEDURES . . . . . . . . . . . .
27C-42
CHECK OF ELECTRONIC CONTROL COUPLING
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27C-49
Inspection Procedure 1: M.U.T.-III cannot
Communicate with the Electronically Controller 4WD
System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27C-42
4WD-ECU . . . . . . . . . . . . . . . . . . . . . . 27C-51
Inspection Procedure 2: Shifting the 4WD Switch does
not Change the Mode.. . . . . . . . . . . . . . . . . 27C-43
Inspection Procedure 3: The Tight Corner Braking
Phenomenon* Appears with the 4WD switch in the 4WD
ECO or 4WD AUTO Position. . . . . . . . . . . . 27C-44
Inspection Procedure 4: No Diagnosis Code is set even
when the 4WD-E/LOCK Indicator Lamps flash.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27C-45
DATA LIST REFERENCE TABLE . . . . . . .
27C-45
REMOVAL AND INSTALLATION . . . . . . . .
27C-51
4WD SWITCH . . . . . . . . . . . . . . . . . . . 27C-52
REMOVAL AND INSTALLATION . . . . . . . .
27C-52
4WD SWITCH CHECK . . . . . . . . . . . . . . . .
27C-52
ELECTRONIC CONTROL COUPLING
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27C-53
REMOVAL AND INSTALLATION . . . . . . . .
27C-53
ELECTRONICALLY CONTROLLED 4WD
27C-3
SERVICE PRECAUTIONS
SERVICE PRECAUTIONS
M1274005600068
TOWING
DRIVING ON SANDY OR SLUSHY ROAD
The vehicle must be towed by a tow truck with all
four wheels raised. If a vehicle is towed with only the
front or rear wheels are raised, the drive system
components may be damaged or the vehicle may
jump out of a tow truck (cart).
As the vehicle is intended for on-road use, long-time
driving on a sandy or slushy road must be avoided. If
the vehicle is driven on a sandy or slushy road for a
long time, the fail-safe function of the electronically
controlled 4WD system may activate. In that case,
the system will switch the 4WD mode into the 2WD
mode to protect the drive train, and illuminate
"4WD-E" and "LOCK" indicators or display a warming message.
WHEEL AND TYRE
Normally, all four tyres must be same in size, in type,
and in brand, except for when a spare tyre is temporarily used. If a wheel or tyre with incorrect size is
installed or tyre pressure is excessively out of the
specified value, the electronically controlled 4WD
system will not operate correctly. In addition, drive
system components may be damaged.
SPEED MEASUREMENT
When using the chassis dynamometer to measure
the speed, always measure it under synchronized
condition between front wheels’ speed and rear
wheels’ speed. If the speed is measured with front
wheels or rear wheels fixed, or with speed difference
between front wheels and rear wheels, drive system
components may be damaged.
SERVICE SPECIFICATIONS
M1274000100121
Item
Standard value
Electronic control coupling solenoid resistance Ω (at 20 °C)
2.2 − 4.0
Electronic control coupling stud bolt length mm
21.6 − 24.4
SEALANT
M1272000500145
Item
Specified sealant
Remark
Joint between differential carrier and
electronic control coupling
ThreeBond 1215, 1216, 1217 or
equivalent
Semi-drying sealant
ELECTRONICALLY CONTROLLED 4WD
27C-4
SPECIAL TOOLS
SPECIAL TOOLS
M1274000200128
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
Check of the electronically
controlled 4WD (the diagnosis
code display, service data display,
freeze frame data display,
actuator test with M.U.T.-III)
ELECTRONICALLY CONTROLLED 4WD
SPECIAL TOOLS
Tool
a
MB991824
b
MB991827
c
MB991910
d
DO NOT USE
MB991911
e
MB991825
f
MB991826
MB991955
27C-5
Number
Name
Use
MB991955
a: MB991824
b: MB991827
c: MB991910
d: MB991911
e: MB991825
f: MB991826
M.U.T.-III sub-assembly
a: Vehicle
communication
interface (V.C.I.)
b: USB cable
c: M.U.T.-III main
harness A (applicable
to vehicles with CAN
communication)
d: M.U.T.-III main
harness B (applicable
to vehicles without
CAN communication)
e: Measurement
adapter
f: Trigger harness
CAUTION
For vehicles with CAN
communication, use the
M.U.T.-III main harness A to
send the simulated vehicle
speed. If you connect the
M.U.T.-III main harness B
instead, the CAN
communication does not
function correctly.
Check of the electronically
controlled 4WD (the diagnosis
code display, service data display,
freeze frame data display,
actuator test with M.U.T.-III)
ELECTRONICALLY CONTROLLED 4WD
27C-6
TROUBLESHOOTING
Tool
a
Number
Name
Use
MB991223
a: MB991219
b: MB991220
c: MB991221
d: MB991222
Wiring harness set
Continuity check and voltage
a: Check harness
measurement at the 4WD-ECU
b: LED harness
wiring harness connector
c: LED harness adapter
d: Probe
MB992006
Extra fine probe
b
c
d
DO NOT USE
MB991223BA
MB992006
TROUBLESHOOTING
STANDARD FLOW OF DIAGNOSTIC
TROUBLESHOOTING
M1274000400047
Refer to GROUP 00 − Contents of Troubleshooting .
PRECAUTIONS FOR DIAGNOSIS
M1274000500088
• After troubleshooting, and removing/installing of
the electronically controlled 4WD system components, check the diagnosis code using M.U.T.-III.
If a diagnosis code is set, erase it and check
again that no diagnosis code is set.
• Before performing a troubleshooting, check that
all four wheels and tyres are same in size, in
type, and in brand. The electronically controlled
4WD system will function correctly only when all
four wheels and tyres are same in size, and tyre
pressure is specified value.
• If any abnormality occurs in the electronically
controlled 4WD system, "4WD-E" and "LOCK"
indicators in the combination meter will illuminate
or a message will be displayed to warn the driver.
• When the vehicle is used under some severe
operational conditions (such as a long-time driving in 4WD on a sandy road, slushy road or road
with deep snows or towing or long uphill driving),
the electronically controlled 4WD system will illuminate "4WD-E" and "LOCK" indicators or display a message to warn the driver.
• The electronically controlled 4WD system is
equipped with the fail-safe function which prohibits 4WD control and shifts to 2WD control if any
abnormality occurs in the system. If there is a risk
that the vehicle behaviour suddenly changes, the
gradual shifting to 2WD control is chosen.
ELECTRONICALLY CONTROLLED 4WD
27C-7
TROUBLESHOOTING
CHECK OF DRIVE MODE INDICATORS
M1274000600160
WARNING INDICATOR
4WD-ECU performs the following checks at a timing
shown in the chart below. 4WD-ECU determines the
malfunction occurred when the failure detection conditions are met, and it sets the diagnosis code and
executes the countermeasures for trouble. When the
failure resume conditions are met, ECU determines
the status is normal, and resumes the system.
< Standard meter>
Drive mode indicator
ACC00021 AB
< High contrast meter>
FAIL-SAFE FUNCTION
FAILURE DETECTION
Drive mode display
Warning display
ACC00022 AB
If a malfunction occurs in the electronically controlled
4WD system, either of the followings operates to
alert you to check a diagnosis code.
• The drive mode indicators flash simultaneously or
alternately <Standard meter>.
• The drive mode display on the multi-information
display flashes, and a message is shown on the
warning display <High contrast meter>.
DIAGNOSTIC FUNCTION
M1274000700134
HOW TO READ DIAGNOSIS CODE
Refer to GROUP 00 − Diagnostic Function .
HOW TO ERASE DIAGNOSIS CODE
Start-up (Initial check just after the ignition
switch is turned ON.)
1. CPU check
• Performs the ROM and RAM check.
2. Actuator check
• After CPU check has been completed, check
the driving voltage with the actuator relay
OFF.
Always (During ignition ON status other than initial check operation)
1. CPU check
• Performs CAN communication and interactive
check between CPUs.
2. Power supply check
• Monitors the CPU supply voltage and checks
if the voltage is within specifications.
3. Actuator check
• Checks if the actuator relay turns ON according to the control.
• Compares the command current value from
CPU with the monitored current and checks if
they agree.
4. External wire connection check
• Checks if the input and output of each external wire connection is open, shorted, or stuck.
FREEZE FRAME DATA REFERENCE
TABLE
M1274001200080
Refer to GROUP 00 − Diagnostic Function .
M.U.T-III can be used to read the freeze frame data (the driving status when the failure occurs) at each diagnosis code detection.
FREEZE FRAME DATA
Item No.
Item
Unit/display contents
1
Odometer
km
4
Accumulated minute
min
5
AWC control mode (4WD control mode)
Mode 1
Mode 2
Mode 3
Mode 4
ELECTRONICALLY CONTROLLED 4WD
27C-8
TROUBLESHOOTING
Item No.
Item
Unit/display contents
6
ABS status
OFF/ON
7
ABS/ASC actuation flag
OFF/ON
8
ASC torque reduction request
OFF/ON
9
Estimated vehicle speed
km/h
10
Brake switch
OFF/ON
11
Parking brake switch
OFF/ON
12
ASC off switch
OFF/ON
14
Steering angle sensor
deg
15
Accelerator position
%
16
FL wheel speed sensor
km/h
17
FR wheel speed sensor
km/h
18
RL wheel speed sensor
km/h
19
RR wheel speed sensor
km/h
20
Centre coupling torque
Nm
21
Yaw rate sensor
deg/s
22
Lateral G-sensor
m/s2
23
Longitudinal G-sensor
m/s2
24
Transfer temperature
°C
26
Centre coupling temperature
°C
28
Centre coupling clutch temperature
°C
29
Master cylinder pressure
MPa
33
ASC equipment information
Not present/present
34
Handle side
LH drive/RH drive
DIAGNOSIS CODE CHART
M1274000800186
CAUTION
On troubleshooting, if the ignition switch is turned ON while disconnecting connector(s), diagnosis
code(s) associated with other system may be set. On completion, confirm all systems for diagnosis
code(s). If diagnosis code(s) are set, erase them all.
Diagnosis code No.
Diagnostic item
Reference
page
C100A
FL wheel speed sensor circuit
P.27C-10
C1011
FL wheel speed sensor signal
P.27C-11
C1014
FL wheel speed sensor performance
P.27C-11
C1015
FR wheel speed sensor circuit
P.27C-10
C101C
FR wheel speed sensor signal
P.27C-11
C101F
FR wheel speed sensor performance
P.27C-11
C1020
RL wheel speed sensor circuit
P.27C-10
C1027
RL wheel speed sensor signal
P.27C-11
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
27C-9
Diagnosis code No.
Diagnostic item
Reference
page
C102A
RL wheel speed sensor performance
P.27C-11
C102B
RR wheel speed sensor circuit
P.27C-10
C1032
RR wheel speed sensor signal
P.27C-11
C1035
RR wheel speed sensor performance
P.27C-11
C1078
Tyre revolutions range
P.27C-12
C1219
Steering wheel sensor signal <ASC>
P.27C-13
C121A
Steering wheel sensor initialization <ASC>
P.27C-14
C123C
Sensor cluster malfunction <ASC>
P.27C-15
C1242
Straight G sensor signal
P.27C-17
C1610
4WD actuator power supply relay
P.27C-18
C1613
4WD mode switch stuck
P.27C-18
C1614
Parking brake switch stuck ON
P.27C-19
C1616
Cranking signal stuck
P.27C-20
C1621
4WD actuator protection
P.27C-21
C1624
4WD ECU internal
P.27C-22
C1626
4WD voltage failure
P.27C-22
C1628
4WD current failure
P.27C-23
C1629
ASC timeout <ASC>
P.27C-24
C1630
Steering wheel sensor timeout <ASC>
P.27C-24
C1631
ETACS timeout
P.27C-25
C1632
Engine timeout
P.27C-26
C1633
T/M timeout
P.27C-26
C1707
Implausible coding data
P.27C-27
C2100
Power supply low voltage
P.27C-28
C2101
Power supply high voltage
P.27C-29
C2205
Steering wheel sensor internal error <ASC>
P.27C-30
U0100
Engine CAN timeout
P.27C-31
U0101
T/M CAN timeout
P.27C-32
U0121
ABS/ASC CAN timeout
P.27C-32
U0126
Steering wheel sensor CAN timeout <ASC>
P.27C-33
U0141
ETACS CAN timeout
P.27C-34
U0401
Engine CAN message
P.27C-35
U0428
Steering wheel sensor CAN message
P.27C-35
U0431
ETACS CAN message
P.27C-36
U1073
Bus-off
P.27C-37
U1195
Coding not completed
P.27C-37
ELECTRONICALLY CONTROLLED 4WD
27C-10
TROUBLESHOOTING
Diagnosis code No.
Diagnostic item
Reference
page
U119A
Chassis No. mismatch
P.27C-38
U1425
T/M CAN message
P.27C-39
U1427
Implausible wheel speed data
P.27C-40
U1428
Sensor Cluster CAN message
P.27C-40
DIAGNOSIS CODE PROCEDURES
Code No.C100A <FL>, C1015 <FR>, C1020 <RL>, 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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
STEP 2. Check whether the diagnosis code is
reset.
Q: Is the relevant wheel speed sensor diagnosis code
No.C100A <FL>, C1015 <FR>, C1020 <RL>, or
C102B <RR> set?
YES : Go to Step 3.
NO : This diagnosis is complete.
OPERATION
4WD-ECU receives the wheel speed data from
ABS/ASC-ECU via the CAN communication.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• One or more of the wheel speed does not follow
PROBABLE CAUSES
•
•
•
•
•
Malfunction of wheel speed sensor
Damaged harness wires and connectors
Malfunction of encoder for wheel speed detection
Malfunction of ABS/ASC-ECU
Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ). After repairing the
CAN bus line, go to Step 2.
STEP 3. M.U.T.-III other system diagnosis code.
Check the ABS diagnosis code (Refer to GROUP
35B − Troubleshooting ) <Vehicles with ABS> or the
ASC diagnosis code (Refer to GROUP 35C − Troubleshooting ) <Vehicles with ASC>.
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
STEP 4. M.U.T.-III data list.
Check the data list of the relevant wheel speed sensor (Refer to P.27C-45).
• Item No.18: FL wheel speed sensor
• Item No.19: FR wheel speed sensor
• Item No.20: RL wheel speed sensor
• Item No.21: RR wheel speed sensor
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
NO : Replace the 4WD-ECU (Refer to P.27C-51).
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
27C-11
Code No.C1011 <FL>, C101C <FR>, C1027 <RL>, 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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
STEP 2. Check whether the diagnosis code is
reset.
Q: Is the relevant wheel speed sensor diagnosis code
No.C1011 <FL>, C101C <FR>, C1027 <RL>, or
C1032 <RR> set?
YES : Go to Step 3.
NO : This diagnosis is complete.
OPERATION
4WD-ECU receives the wheel speed data from
ABS/ASC-ECU via the CAN communication.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• An irregular change in the wheel speed sensor is
detected
STEP 3. M.U.T.-III other system diagnosis code.
Check the ABS diagnosis code (Refer to GROUP
35B − Troubleshooting ) <Vehicles with ABS> or the
ASC diagnosis code (Refer to GROUP 35C − Troubleshooting ) <Vehicles with ASC>.
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
PROBABLE CAUSES
•
•
•
•
•
Malfunction of wheel speed sensor
Damaged harness wires and connectors
Malfunction of encoder for wheel speed detection
Malfunction of ABS/ASC-ECU
Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
STEP 4. M.U.T.-III data list.
Check the data list of the relevant wheel speed sensor (Refer to P.27C-45).
• Item No.18: FL wheel speed sensor
• Item No.19: FR wheel speed sensor
• Item No.20: RL wheel speed sensor
• Item No.21: RR wheel speed sensor
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
NO : Replace the 4WD-ECU (Refer to P.27C-51).
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ). After repairing the
CAN bus line, go to Step 2.
Code No.C1014 <FL>, C101F <FR>, C102A <RL>, 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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
OPERATION
4WD-ECU receives the wheel speed data from
ABS/ASC-ECU via the CAN communication.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• One or more of the wheel speed is out of the
range of the specified value
PROBABLE CAUSES
•
•
•
•
•
Malfunction of wheel speed sensor
Damaged harness wires and connectors
Malfunction of encoder for wheel speed detection
Malfunction of ABS/ASC-ECU
Malfunction of 4WD-ECU
27C-12
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ). After repairing the
CAN bus line, go to Step 2.
STEP 2. Check whether the diagnosis code is
reset.
Q: Is the relevant wheel speed sensor diagnosis code
No.C1014 <FL>, C101F <FR>, C102A <RL>, or
C1035 <RR> set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. M.U.T.-III other system diagnosis code.
Check the ABS diagnosis code (Refer to GROUP
35B − Troubleshooting ) <Vehicles with ABS> or the
ASC diagnosis code (Refer to GROUP 35C − Troubleshooting ) <Vehicles with ASC>.
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
STEP 4. M.U.T.-III data list.
Check the data list of the relevant wheel speed sensor (Refer to P.27C-45).
• Item No.18: FL wheel speed sensor
• Item No.19: FR wheel speed sensor
• Item No.20: RL wheel speed sensor
• Item No.21: RR wheel speed sensor
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
NO : Replace the 4WD-ECU (Refer to P.27C-51).
Code No.C1078: Tyre Revolutions Range
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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
OPERATION
4WD-ECU receives the wheel speed data from
ABS/ASC-ECU via the CAN communication.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• Difference in rotation speed between the front
and rear wheels exceeds continuously a specific
value.
PROBABLE CAUSES
•
•
•
•
•
Tyre with incorrect diameter equipped
Spare tyre installed
Improper tyre pressure
Malfunction of ABS/ASC-ECU
Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus line (Refer to GROUP
54C − Troubleshooting ). After repairing the
CAN bus line, go to Step 2.
STEP 2. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1078 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Check the tyres
Check that the wheels/tyres with the identical size
are installed, and that each tyre pressure is within
the value specified on the tyre pressure label.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Install the wheels/tyres with the identical
size, or adjust the tyre pressure. Then go to
Step 5.
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
STEP 4. M.U.T.-III other system diagnosis code.
Check the ABS diagnosis code (Refer to GROUP
35B − Troubleshooting ) <Vehicles with ABS> or the
ASC diagnosis code (Refer to GROUP 35C − Troubleshooting ) <Vehicles with ASC>.
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 5.
27C-13
STEP 5. M.U.T.-III data list.
Check the following data list. (Refer to P.27C-45).
• Item No.18: FL wheel speed sensor
• Item No.19: FR wheel speed sensor
• Item No.20: RL wheel speed sensor
• Item No.21: RR wheel speed sensor
Q: Is the check result normal?
YES : Intermittent malfunction. (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
NO : Replace the 4WD-ECU. (Refer to
P.27C-51).
Code No.C1219: Steering Wheel Sensor Signal <ASC>
•
•
•
•
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.
Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
When the steering wheel sensor is replaced,
calibrate the steering wheel sensor (Refer to
GROUP 35C − On-vehicle Service ), and reset
the steering wheel sensor correction amount
stored in the 4WD-ECU. (Item No. 1: SAS
adjusted value P.27C-48).
When hydraulic unit (integrated with G and
yaw rate sensor) is replaced, calibrate G and
yaw rate sensor (refer to GROUP 35C −
On-vehicle Service )
OPERATION
4WD-ECU receives steering wheel data from the
steering wheel sensor via CAN communication.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the abnormality
below is detected:
• The tolerance of neutral position of steering
wheel sensor exceeds the specified range.
• Abnormality in steering wheel sensor output
value
• Incorrect installation is detected by the initial
check of the steering wheel sensor signal.
• Abnormality is detected by a comparison of output value from the steering wheel sensor with the
output values from wheel speed sensor and G
and yaw rate sensor.
PROBABLE CAUSES
•
•
•
•
•
•
Improper installation of steering wheel sensor
Malfunction of steering wheel sensor
Malfunction of G and yaw rate sensor
Malfunction of wheel speed sensor
Malfunction of 4WD-ECU
Vehicle straight-ahead position and steering
wheel neutral position is not matched.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ). After repairing the
CAN bus line, go to Step 2.
STEP 2. Check whether the diagnosis code is
reset.
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.
Q: Is diagnosis code No.C2205 set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
27C-14
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
STEP 4. M.U.T.-III diagnosis code.
Check if 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 : Carry out the appropriate troubleshooting.
Then go to Step 9.
NO : Go to Step 5.
STEP 5. Check of steering wheel sensor
installation status
Check that the steering wheel sensor is installed correctly (Refer to GROUP 35C − Steering Wheel Sensor ).
Q: Is the check result normal?
YES : Go to Step 6.
NO : Install the steering wheel sensor correctly.
STEP 7. M.U.T.-III data list.
Check the following data list (Refer toP.27C-45).
• Item No.8: Steering angle sensor
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the steering wheel sensor (Refer to
GROUP 35C − Steering Wheel Sensor ).
Then, go to Step 9.
STEP 8. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1219 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then, go to Step 9 .
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
Then go to Step 6.
STEP 6. Wheel alignment check
Q: Is the check result normal?
YES : After checking the wheel alignment,
calibrate the steering wheel sensor (Refer to
GROUP 35C − On-vehicle Service ), and
reset the steering wheel sensor correction
amount stored in the 4WD-ECU(Refer to
P.27C-48). Then, go to Step 7.
NO : After adjusting the wheel alignment,
calibrate the steering wheel sensor (Refer to
GROUP 35C − On-vehicle Service ), and
reset the steering wheel sensor correction
amount stored in the 4WD-ECU(Refer to
P.27C-48). Then, go to Step 7.
STEP 9. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1219 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No.C121A: Steering Wheel Sensor Initialization <ASC>
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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
• When the steering wheel sensor is replaced,
calibrate the steering wheel sensor (Refer to
GROUP 35C − On-vehicle Service ), and reset
the steering wheel sensor correction amount
stored in the 4WD-ECU. (Item No. 1: SAS
adjusted value P.27C-48).
OPERATION
Steering wheel sensor stores the neutral position
learned by the M.U.T.-III. When the neutral position
has not been learned, the steering wheel sensor outputs the signal indicating that the learning has not
been performed.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• the steering wheel sensor has not learned the
neutral position
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
PROBABLE CAUSES
• Steering wheel sensor neutral point not learned
• Malfunction of steering wheel sensor
• Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 3. Steering wheel sensor calibration.
Perform calibration of the steering wheel sensor
(Refer to GROUP 35C − On-vehicle Service ).
Q: Has the calibration succeeded?
YES : Go to Step 4.
NO : Replace the steering wheel sensor (Refer to
GROUP 35C − Steering Wheel Sensor ).
Then, go to Step 4.
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ). After repairing the
CAN bus line, go to Step 2.
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C121A set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then, go to Step 5.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 2. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C121A set?
YES : Go to Step 3.
NO : This diagnosis is complete.
27C-15
STEP 5. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C121A set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No.C123C: Sensor Cluster Malfunction <ASC>
•
•
•
•
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.
Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
When the steering wheel sensor is replaced,
calibrate the steering wheel sensor (Refer to
GROUP 35C − On-vehicle Service ), and reset
the steering wheel sensor correction amount
stored in the 4WD-ECU. (Item No. 1: SAS
adjusted value P.27C-48).
When hydraulic unit (integrated with G and
yaw rate sensor) is replaced, calibrate G and
yaw rate sensor (Refer to GROUP 35C −
On-vehicle Service .)
OPERATION
4WD-ECU receives the G and yaw rate sensor data
from ASC-ECU via the CAN communication.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the abnormality
below is detected:
• Abnormality in G and yaw rate sensor output
value
• Abnormality is detected by a comparison of output value from the G and yaw rate sensor with the
output values from wheel speed sensor and
steering wheel sensor.
PROBABLE CAUSES
•
•
•
•
•
Malfunction of G and yaw rate sensor
Malfunction of wheel speed sensor
Improper installation of steering wheel sensor
Malfunction of steering wheel sensor
Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
27C-16
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ). After repairing the
CAN bus line, go to Step 2.
STEP 2. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C123C set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 7. Check of steering wheel sensor
installation status.
Check that the steering wheel sensor is installed correctly (Refer to GROUP 35C − Steering Wheel Sensor ).
Q: Is the check result normal?
YES : Go to Step 8.
NO : Install the steering wheel sensor correctly.
Then go to Step 8.
STEP 8. Wheel alignment check.
STEP 3. M.U.T.-III diagnosis code.
Check the ASC diagnosis code. (Refer to GROUP
35C − Troubleshooting ).
Q: Is the check result normal?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
STEP 4. M.U.T.-III other system diagnosis code.
Check if the wheel speed sensor-related, or steering
wheel sensor-related diagnosis code is set.
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 5.
STEP 5. Check of hydraulic unit (integrated with
G and yaw rate sensor) installation status.
Check that the hydraulic unit (integrated with G and
yaw rate sensor) is installed correctly (Refer to
GROUP 35C − Hydraulic unit (integrated with G and
yaw rate sensor) ).
Q: Is the check result normal?
YES : Go to Step 6.
NO : Reinstall the hydraulic unit (integrated with
G and yaw rate sensor) correctly. Then go
to Step 6.
STEP 6. M.U.T.-III data list.
Check the following data list (Refer to P.27C-45).
• Item No.22: Yaw rate sensor
• Item No.23: Lateral G sensor
Q: Is the check result normal?
YES : Go to Step 7.
NO : Replace the hydraulic unit (integrated with
G and yaw rate sensor) is installed correctly
(Refer to GROUP 35C − Hydraulic unit
(integrated with G and yaw rate sensor) ).
Then go to Step 11.
Q: Is the check result normal?
YES : After checking the wheel alignment,
calibrate the steering wheel sensor (Refer to
GROUP 35C − On-vehicle Service ), and
reset the steering wheel sensor correction
amount stored in the 4WD-ECU(Refer to
P.27C-48). Then go to Step 9.
NO : After adjusting the wheel alignment,
calibrate the steering wheel sensor (Refer to
GROUP 35C − On-vehicle Service ), and
reset the steering wheel sensor correction
amount stored in the 4WD-ECU(Refer to
P.27C-48). Then go to Step 9.
STEP 9. M.U.T.-III data list.
Check the following data list (Refer toP.27C-45).
• Item No.8: Steering angle sensor
Q: Is the check result normal?
YES : Go to Step 10.
NO : Replace the steering wheel sensor (Refer to
GROUP 35C − Steering Wheel Sensor ).
Then go to Step 10.
STEP 10. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C123C set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 11.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 11. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C123C set?
YES : Return to Step 1.
NO : This diagnosis is complete.
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
27C-17
Code No.C1242: Straight 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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
• When hydraulic unit (integrated with G and
yaw rate sensor) is replaced, calibrate G and
yaw rate sensor (refer to GROUP 35C −
On-vehicle Service )
OPERATION
4WD-ECU receives the G and yaw rate sensor data
from ASC-ECU via the CAN communication.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the abnormality
below is detected:
• Abnormality in G and yaw rate sensor output
value
• 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 G and yaw rate sensor
Malfunction of wheel speed sensor
Malfunction of stop lamp switch
Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ). After repairing the
CAN bus line, go to Step 2.
STEP 3. M.U.T.-III other system diagnosis code.
Check if the wheel speed sensor-related diagnosis
code is set.
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
STEP 4. Check of hydraulic unit (integrated with
G and yaw rate sensor) installation status.
Check that the hydraulic unit (integrated with G and
yaw rate sensor) is installed correctly (Refer to
GROUP 35B − Hydraulic unit (integrated with G and
yaw rate sensor) <Vehicles with ABS>GROUP 35C
− Hydraulic unit (integrated with G and yaw rate sensor) <Vehicles with ASC>).
Q: Is the check result normal?
YES : Go to Step 5.
NO : Reinstall the hydraulic unit (integrated with
G and yaw rate sensor) correctly. Then go
to Step 5.
STEP 5. M.U.T.-III data list.
Check the following data list (Refer toP.27C-45).
• Item No.24: Longitudinal G sensor
Q: Is the check result normal?
YES : Go to Step 6.
NO : Replace the hydraulic unit (integrated with
G and yaw rate sensor) (Refer to GROUP
35B − Hydraulic unit (integrated with G and
yaw rate sensor) <Vehicles with ABS> or
GROUP 35C − Hydraulic unit (integrated
with G and yaw rate sensor) <Vehicles with
ASC>). Then go to Step 7.
STEP 6. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1242 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 7.
NO : Intermittent malfunction (Refer to GROUP
STEP 2. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1242 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
00 − How to Cope with Intermittent
Malfunction ).
STEP 7. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1242 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
27C-18
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
Code No.C1610: 4WD Actuator Power Supply Relay
OPERATION
A relay is incorporated in 4WD-ECU, and the power
is supplied to the actuator via this relay.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the abnormality
below is detected:
• Battery power supply voltage is less than 6 V.
• Abnormal voltage in the 4WD-ECU.
PROBABLE CAUSES
• Malfunction of 4WD-ECU
• Malfunction of electronic control coupling solenoid
• Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
STEP 1. Check the wiring harness between
electronic control coupling solenoid connector
and 4WD-ECU connector terminal SOL+, SOL-.
Check the power supply or earth line for short circuit.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the defective connector or the wiring
STEP 2. Check of the electronic control coupling
solenoid
Refer to P.27C-49.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Replace the electronic control coupling
(Refer to P.27C-53).
STEP 3. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1610 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 4.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1610 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
harness.
Code No.C1613: 4WD Mode Switch Stuck
OPERATION
The 4WD-ECU controls the driving mode by the signal from the 4WD switch.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• The 4WD switch is stuck on
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
Check the following data list (Refer to P.27C-45).
• Item No.41: Mode SW
Q: Is the check result normal?
YES : Go to Step 4.
NO : Go to Step 2.
PROBABLE CAUSES
• 4WD switch malfunction
• Damaged harness wires and connectors
• Malfunction of 4WD-ECU
STEP 2. Check the wiring harness between 4WD
switch connector and 4WD-ECU connector
terminal sw-1.
Check the output line for short circuit.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the defective connector or the wiring
harness.
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
STEP 3. 4WD switch inspection
Refer to P.27C-52.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the 4WD switch (Refer to
P.27C-52). Then go to Step 5.
STEP 4. Check whether the diagnosis code is
reset.
Q: Is the diagnosis code No.C1613 set?
27C-19
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 5.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 5. Check whether the diagnosis code is
reset.
Q: Is the diagnosis code No.C1613 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No.C1614: Parking Brake Switch Stuck On
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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
OPERATION
The 4WD-ECU receives the parking brake switch
signal from the combination meter via CAN communication.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• The parking brake switch is stuck on
PROBABLE CAUSES
•
•
•
•
•
Parking brake switch malfunction
Damaged harness wires and connectors
Combination meter malfunction
Malfunction of 4WD-ECU
Driving with parking brake ON
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ). After repairing the
CAN bus line, go to Step 2.
STEP 6. Check whether the diagnosis code is
reset.
STEP 2. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1614 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 toP.27C-45).
• Item No.29: Parking brake SW (CAN input)
Q: Is the check result normal?
YES : Go to Step 7.
NO : Go to Step 4.
STEP 4. Check the parking brake switch.
Check the parking brake switch (Refer to GROUP 36
− On-vehicle Service ).
Q: Is the check result normal?
YES : Go to Step 5.
NO : Replace the parking brake switch. (Refer to
GROUP 36 − Parking Brake Lever ). Then
go to Step 7.
STEP 5. Check the wiring harness between
combination meter connector and parking brake
switch connector.
Check the power supply line for short circuit.
Q: Is the check result normal?
YES : Replace the combination meter (Refer to
GROUP 54A − Combination Meter ). Then
go to Step 6.
NO : Repair the defective connector or the wiring
harness. Then go to Step 6.
Q: Is diagnosis code No.C1614 set?
27C-20
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
YES : Replace the 4WD-ECU. (Refer to
P.27C-51). Then go to Step 7.
NO : Intermittent malfunction. (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 7. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1614 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No.C1616: Cranking Signal 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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
• When the ETACS-ECU of vehicles without
KOS is replaced, the encrypted code of the
ignition key needs to be registered to the
ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in
GROUP 54A, Immobilizer System − How to
Register Key ID .)
STEP 2. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1616 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. M.U.T.-III other system diagnosis code.
• Check the KOS diagnosis code (Refer to GROUP
42B − Troubleshooting ) <Vehicles with KOS>.
• Check the ETACS diagnosis code (Refer to
GROUP 54A − Troubleshooting ).
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
OPERATION
4WD-ECU receives the signal of the ignition switch
from ETACS-ECU via CAN communication.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• The cranking signal is set for 5 seconds or more
continuously while driving
PROBABLE CAUSES
•
•
•
•
Malfunction of the ETACS-ECU
Ignition switch malfunction
Damaged harness wires and connectors
Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ). After repairing the
CAN bus line, go to Step 2.
YES : Go to Step 7.
NO : Repair the defective connector or the wiring
STEP 4. M.U.T.-III data list.
Check the following data list (Refer toP.27C-45).
• Item No.30: Ignition SW (CAN input)
Q: Is the check result normal?
YES : Go to Step 8.
NO : Go to Step 5.
STEP 5. Ignition switch check
(1) Disconnect ignition switch connector, and check
the continuity between the power supply and start
signal at the ignition switch side.
(2) Turn the ignition switch to the "ON" position.
OK: No continuity
Q: Is the check result normal?
YES : Go to Step 6.
NO : Replace the ignition switch. (Refer to
GROUP 54A − Ignition Switch ). Then go to
Step 9.
STEP 6. Check of short circuit in start signal line
between ignition switch connector and
ETACS-ECU connector.
Q: Is the check result normal?
harness. Then go to Step 9.
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
STEP 7. M.U.T.-III data list.
Check the data list of the ETACS (Refer to GROUP
54A − ETACS ).
• Item No.287: Starter switch
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the ETACS-ECU. Then go to Step
8.
STEP 8. Check whether the diagnosis code is
reset.
27C-21
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 9 .
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 9. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1616 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Q: Is diagnosis code No.C1616 set?
Code No.C1621: 4WD Actuator Protection
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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
OPERATION
The 4WD-ECU calculates the electronic control coupling temperature by the information of the electronic
control coupling control amount, outside temperate,
etc. If it is detected that the electronic control coupling temperature becomes extremely high, the high
fluid temperature warning is displayed on the warning indicator.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• The control is suspended to protect the electronic
control coupling.
PROBABLE CAUSES
• Electronic control coupling protection control status
• Severe driving
• Electronic control coupling failure (clutch slippage, etc.)
• Outside temperature signal failure
• Wheel speed signal failure
• Engine-related failure (engine speed signal failure)
• Ignition off time signal failure
DIAGNOSIS PROCEDURE
STEP 1. Check whether the diagnosis code is
reset.
(1) To release the electronic control coupling
(Centre) protection control, leave the vehicle for
15 minutes or longer after the high fluid
temperature warning on the warning indicator
disappears.
(2) Erase the diagnosis code.
(3) Carry out the test drive.
NOTE: Do not carry out the severe test drive.
(4) Check if the diagnosis code is set.
Q: Is diagnosis code No.C1621 set?
YES : Go to Step 2.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 2. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ). After repairing the
CAN bus line, go to Step 3.
STEP 3. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1621 set?
YES : Go to Step 4.
NO : This diagnosis is complete.
27C-22
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
STEP 4. M.U.T.-III data list
Check the following data list (Refer to P.27C-45).
• Item No.12: Engine speed
Q: Is the check result normal?
YES : Go to Step 5.
NO : Perform the troubleshooting for the engine
(Refer to GROUP 13A − Troubleshooting ).
STEP 5. M.U.T.-III data list
Check the following data list (Refer to P.27C-45).
• Item No.18: FL Wheel speed sensor
• Item No.19: FR Wheel speed sensor
• Item No.20: RL Wheel speed sensor
• Item No.21: RR Wheel speed sensor
Q: Is the check result normal?
YES : Go to Step 6.
NO : Perform the ABS diagnosis code (Refer to
GROUP 35B − Troubleshooting ) <Vehicles
with ABS> or the ASC diagnosis code
(Refer to GROUP 35C − Troubleshooting )
<Vehicles with ASC>.
STEP 6. M.U.T.-III data list
Check the following data list (Refer to P.27C-45).
• Item No.34: Ambient temperature (CAN input)
• Item No.35: Ignition off time (CAN input)
Q: Is the check result normal?
YES : Go to Step 7.
NO : Perform the troubleshooting for the ETACS
(Refer to GROUP 54A − ETACS,
Troubleshooting ).
STEP 7. Check of the electronic control coupling
Refer to P.27C-49.
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the electronic control coupling
(Refer to P.27C-53).
STEP 8. Check whether the diagnosis code is
reset.
(1) To release the electronic control coupling
protection control, leave the vehicle for 15
minutes or longer after the high fluid temperature
warning on the warning indicator disappears.
(2) Erase the diagnosis code.
(3) Carry out the test drive.
NOTE: Do not carry out the severe test drive.
(4) Check if the diagnosis code is set.
Q: Is diagnosis code No.C1621 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
Code No.C1624: 4WD-ECU Internal
OPERATION
4WD-ECU monitors the malfunction in the ECU.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• RAM/ROM/EEPROM of 4WD-ECU has a failure.
PROBABLE CAUSES
• Malfunction of 4WD-ECU
• Damaged harness wires and connectors
Code No. C1626: 4WD Voltage Failure
OPERATION
The 4WD-ECU monitors the actuator power supply
voltage.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• Electronic control coupling solenoid voltage monitor value: 10 V or more.
PROBABLE CAUSES
• Malfunction of electronic control coupling solenoid
• Damaged harness wires and connectors
• Malfunction of 4WD-ECU
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
DIAGNOSIS PROCEDURE
STEP 1. Check the wiring harness between
electronic control coupling solenoid connector
and 4WD-ECU connector terminal SOL+, SOL-.
Check the power supply, earth line for short circuit
(for short to the power supply).
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the defective connector or the wiring
harness. Then go to Step 4.
STEP 2. Check of the electronic control coupling
solenoid
Refer to P.27C-49.
Q: Is the check result normal?
27C-23
YES : Go to Step 3.
NO : Replace the electronic control coupling
(Refer to P.27C-53). Then go to Step 4.
STEP 3. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1626 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 4.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1626 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No. C1628: 4WD Current Failure
OPERATION
The 4WD-ECU monitors the current value of the
electronic control coupling solenoid.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the abnormality
below is detected:
• Commanded current to the electronic control coupling does not correspond with the monitored current value.
PROBABLE CAUSES
• Malfunction of electronic control coupling solenoid
• Damaged harness wires and connectors
• Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
YES : Go to Step 2
NO : Repair the defective connector or the wiring
harness. Then go to Step 4.
STEP 2. Check of the electronic control coupling
solenoid
Refer to P.27C-49.
Q: Is the check result normal?
YES : Go to Step 3
NO : Replace the electronic control coupling
(Refer to P.27C-53). Then go to Step 4.
STEP 3. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1628 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 4.
NO : Intermittent malfunction (Refer to GROUP
STEP 1. Check the wiring harness between
electronic control coupling solenoid connector
and 4WD-ECU connector terminal SOL+, SOL-.
Check the power supply, earth line for open or short
circuit.
Q: Is the check result normal?
00 − How to Cope with Intermittent
Malfunction ).
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1628 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
27C-24
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
Code No. C1629: ASC Timeout <ASC>
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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
OPERATION
4WD-ECU communicates with the ASC-ECU via the
CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• The CAN signal of the ASC-ECU cannot be
received.
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ).
STEP 2. M.U.T.-III other system diagnosis code.
Check the ASC diagnosis code (Refer to GROUP
35C − Troubleshooting ).
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
STEP 3. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1629 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 4.
NO : Intermittent malfunction (Refer to GROUP
PROBABLE CAUSES
•
•
•
•
Malfunction of the CAN bus line
Damaged connectors (ASC-ECU)
Malfunction of ASC-ECU
Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
00 − How to Cope with Intermittent
Malfunction ).
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1629 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Q: Is the check result normal?
Code No. C1630: Steering Wheel Sensor Timeout <ASC>
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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
• When the steering wheel sensor is replaced,
calibrate the steering wheel sensor (Refer to
GROUP 35C − On-vehicle Service ), and reset
the steering wheel sensor correction amount
stored in the 4WD-ECU. (Item No. 1: SAS
adjusted value P.27C-48).
OPERATION
4WD-ECU communicates with the steering wheel
sensor via the CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• The CAN signal of the steering wheel sensor cannot be received.
PROBABLE CAUSES
•
•
•
•
Malfunction of the CAN bus line
Damaged connectors (steering wheel sensor)
Malfunction of the steering wheel sensor
Malfunction of 4WD-ECU
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ).
STEP 2. M.U.T.-III data list.
Check the following data list (Refer to P.27C-45).
• Item No.8: Steering angle sensor
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
27C-25
STEP 3. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1630 set?
YES : Replace the 4WD-ECU.(Refer to
P.27C-51). Then go to Step 4.
NO : Intermittent malfunction. (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1630 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
00 − How to Cope with Intermittent
Malfunction ).
NO : Replace the steering wheel sensor (Refer to
GROUP 35C − Steering Wheel Sensor ).
Then go to Step 3.
Code No. C1631: ETACS 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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
OPERATION
4WD-ECU communicates with the ETACS-ECU via
the CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• The CAN signal of the ETACS-ECU cannot be
received.
PROBABLE CAUSES
•
•
•
•
Malfunction of the CAN bus line
Damaged connectors (ETACS-ECU)
ETACS-ECU malfunction
Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ).
STEP 2. M.U.T.-III other system diagnosis code.
Check the ETACS diagnosis code (Refer to GROUP
54A − Troubleshooting ).
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
STEP 3. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1631 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 4.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
27C-26
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
STEP 4. Check whether the diagnosis code is
reset.
YES : Return to Step 1.
NO : This diagnosis is complete.
Q: Is diagnosis code No.C1631 set?
Code No. C1632: Engine 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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
OPERATION
4WD-ECU communicates with the engine-ECU via
the CAN bus lines.
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ). After repairing the
CAN bus line, go to Step 2.
STEP 2. M.U.T.-III other system diagnosis code.
Check the engine diagnosis code (Refer to GROUP
13A −Troubleshooting ).
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the abnormality
below is detected:
• The CAN signal of the engine-ECU cannot be
received.
PROBABLE CAUSES
•
•
•
•
Malfunction of the CAN bus line
Damaged connectors (Engine-ECU)
Malfunction of Engine-ECU
Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
STEP 3. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1632 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 4.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1632 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Q: Is the check result normal?
Code No. C1633: T/M 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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
• When the ETACS-ECU of vehicles without
KOS is replaced, the encrypted code of the
ignition key needs to be registered to the
ETACS-ECU. (If the encrypted code is not reg-
istered, the engine cannot be started. Register the encrypted code as described in
GROUP 54A, Immobilizer System − How to
Register Key ID .)
OPERATION
4WD-ECU communicates with CVT-ECU via the
CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
• the CAN signal of the CVT-ECU cannot be
received.
PROBABLE CAUSES
•
•
•
•
•
Malfunction of the CAN bus line
Damaged connectors (CVT-ECU)
Malfunction of CVT-ECU
Malfunction of 4WD-ECU
Coding failure
27C-27
STEP 3. ETACS-ECU coding data check.
Check the transmission coding data stored in
ETACS-ECU for any abnormality (Refer to GROUP
00 − Coding Reference Table ).
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the ETACS-ECU. Then go to Step
5.
DIAGNOSIS PROCEDURE
STEP 4. Check whether the diagnosis code is
reset.
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is diagnosis code No.C1633 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 5 .
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ).
STEP 2. M.U.T.-III other system diagnosis code.
Check the CVT diagnosis code (Refer to GROUP
23A − CVT, Troubleshooting ).
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
STEP 5. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1633 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
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.
Whenever the ECU is replaced, ensure that
the communication circuit is normal.
When the diagnosis code No.C1707 is set in
4WD-ECU, the diagnosis code may also be
set in ETACS-ECU. When the diagnosis code
is set in ETACS-ECU, perform the diagnosis
of the diagnosis code for ETACS-ECU first.
When the ETACS-ECU of vehicles without
KOS is replaced, the encrypted code of the
ignition key needs to be registered to the
ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in
GROUP 54A, Immobilizer System − How to
Register Key ID .)
OPERATION
4WD-ECU receives the vehicle information stored in
ETACS-ECU via CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• The vehicle information received from
ETACS-ECU is not correct.
PROBABLE CAUSES
•
•
•
•
Malfunction of the CAN bus line
ETACS-ECU malfunction
Malfunction of 4WD-ECU
ETACS-ECU has been interchanged between
two vehicles.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
27C-28
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ).
STEP 2. M.U.T.-III other system diagnosis code.
Check the ETACS diagnosis code (Refer to GROUP
54A − Troubleshooting ).
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
STEP 3. ETACS-ECU coding data check
Using the M.U.T.-III, check if there is the
engine-related, T/M-related, ASC-related abnormality to the coding data stored in the ETACS-ECU
(Refer to GROUP 00 − Coding Reference Table ).
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair the coding data or replace
ETACS-ECU. Then go to Step 6.
STEP 4. Check the part number of ETACS-ECU
Check the part number of ETACS-ECU.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Replace the ETACS-ECU (Refer to GROUP
54A − ETACS-ECU ), and then go to Step 6.
STEP 5. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1707 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 6 .
NO : Intermittent malfunction. (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 6. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C1707 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No.C2100: Power supply low voltage
CAUTION
• When the ETACS-ECU of vehicles without
KOS is replaced, the encrypted code of the
ignition key needs to be registered to the
ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in
GROUP 54A, Immobilizer System − How to
Register Key ID .)
OPERATION
4WD-ECU power supply is provided from the battery
via ETACS-ECU.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the abnormality
below is detected:
• Voltage between the battery and ETACS-ECU:
Less than 9 V
PROBABLE CAUSES
• Battery failure
• Malfunction of charging system
• Malfunction of ETACS-ECU (power supply circuit
system)
• Damaged harness wires and connectors
• Malfunction of electronic control coupling solenoid
• Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III other system diagnosis code.
Check the ETACS diagnosis code (Refer to GROUP
54A − Troubleshooting ).
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 2.
STEP 2. Check the battery.
Refer to GROUP 54A − Battery Test .
Q: Is the check result normal?
YES : Go to Step 4.
NO : Charge or replace the battery. Then go to
Step 3.
STEP 3. Check the charging system.
Refer to GROUP 16 − Charging System .
Q: Is the check result normal?
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
YES : Go to Step 4.
NO : Repair or replace the charging system
component(s).
STEP 4. Voltage measurement at 4WD-ECU
connector
Disconnect the connector, and measure the voltage
between terminal BAtt and body earth at the wiring
harness side.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair the defective connector or the wiring
harness. Then go to Step 5.
STEP 5. M.U.T.-III data list.
Check the following data list (Refer to P.27C-45).
• Item No.31: Battery voltage (CAN input)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
NO : Replace the ETACS-ECU. Then go to Step
10.
STEP 6. Check the wiring harness between
4WD-ECU connector terminal GND1 and body
earth.
Check the earth line for open circuit.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Repair the defective connector or the wiring
harness. Then go to Step 10.
27C-29
STEP 7. Check the wiring harness between
electronic control coupling solenoid connector
and 4WD-ECU connector terminal SOL+, SOL-.
Check the power supply, earth line for short circuit.
Q: Is the check result normal?
YES : Go to Step 8.
NO : Repair the defective connector or the wiring
harness. Then go to Step 10.
STEP 8. Check of the electronic control coupling
solenoid
Refer to P.27C-49.
Q: Is the check result normal?
YES : Go to Step 9.
NO : Replace the electronic control coupling
(Refer to P.27C-53). Then go to Step 10.
STEP 9. M.U.T.-III data list.
Check the following data list (Refer to P.27C-45).
• Item No.31: Battery voltage (CAN input)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
NO : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 10.
STEP 10. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C2100 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No.C2101: Power supply high voltage
OPERATION
4WD-ECU power supply is provided from the battery
via ETACS-ECU.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the abnormality
below is detected:
• Voltage between the battery and ETACS-ECU:
More than 18 V
PROBABLE CAUSES
• Malfunction of charging system
• Loose battery terminal
• Damaged harness wires and connectors
• Malfunction of 4WD-ECU
• ETACS-ECU malfunction
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III other system diagnosis code.
Check the ETACS diagnosis code (Refer to GROUP
54A − Troubleshooting ).
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 2.
27C-30
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
STEP 2. Battery terminal check
Check that the battery terminal is not loose.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Securely install the battery terminal. Then
go to Step 3.
STEP 3. Check the charging system.
Refer to GROUP 16 − Charging System .
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair or replace the charging system
component(s).
STEP 4. Check the battery.
Refer to GROUP 54A − Battery Test .
STEP 5. Voltage measurement at 4WD-ECU
connector
Disconnect the connector, and measure the voltage
between terminal BATT and body earth at the wiring
harness side.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair the defective connector or the wiring
harness. Then go to Step 7.
STEP 6. M.U.T.-III data list.
Check the following data list (Refer to P.27C-45).
• Item No.31: Battery voltage (CAN input)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
NO : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 7.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Replace the battery. Then go to Step 5.
STEP 7. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C2101 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No.C2205: Steering Wheel Sensor 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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
• When the steering wheel sensor is replaced,
calibrate the steering wheel sensor (Refer to
GROUP 35C − On-vehicle Service ), and reset
the steering wheel sensor correction amount
stored in the 4WD-ECU. (Item No. 1: SAS
adjusted value P.27C-48).
OPERATION
4WD-ECU communicates with the steering wheel
sensor via the CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• The failure status information by the self-diagnosis of the steering wheel sensor.
PROBABLE CAUSES
• Malfunction of the steering wheel sensor
• Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ). After repairing the
CAN bus line, go to Step 2.
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
27C-31
STEP 2. Check whether the diagnosis code is
reset.
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.C2205 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
Q: Is diagnosis code No.C2205 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 5.
NO : Intermittent malfunction (Refer to GROUP
STEP 3. M.U.T.-III data list.
Check the following data list (Refer to P.27C-45).
• Item No.8: Steering angle sensor
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the steering wheel sensor (Refer to
GROUP 35C − Steering Wheel Sensor ).
Then go to Step 5.
00 − How to Cope with Intermittent
Malfunction ).
STEP 5. 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.U0100: Engine 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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
OPERATION
4WD-ECU communicates with the engine-ECU via
the CAN bus lines.
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ). After repairing the
CAN bus line, go to Step 2.
STEP 2. M.U.T.-III other system diagnosis code.
Check the engine diagnosis code (Refer to GROUP
13A −Troubleshooting ).
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• The signal sent from the engine-ECU cannot be
received for a certain period.
PROBABLE CAUSES
• Malfunction of the CAN bus line
• Malfunction of power supply circuit system
(engine-ECU)
• Malfunction of ECU (engine-ECU)
• Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
STEP 3. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U0100 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 4.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U0100 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
27C-32
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
Code No.U0101: T/M 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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
• When the ETACS-ECU of vehicles without
KOS is replaced, the encrypted code of the
ignition key needs to be registered to the
ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in
GROUP 54A, Immobilizer System − How to
Register Key ID .)
OPERATION
4WD-ECU communicates with CVT-ECU via the
CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• The signal sent from the CVT-ECU cannot be
received for a certain period.
PROBABLE CAUSES
• Malfunction of the CAN bus line
• Malfunction of power supply circuit system
(CVT-ECU)
• Malfunction of ECU (CVT-ECU)
• Malfunction of 4WD-ECU
• ETACS coding failure
DIAGNOSIS PROCEDURE
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ).
STEP 2. M.U.T.-III other system diagnosis code.
Check the CVT diagnosis code (Refer to GROUP
23A − CVT, Troubleshooting ).
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
STEP 3. ETACS-ECU coding data check.
Check the transmission coding data stored in
ETACS-ECU for any abnormality (Refer to GROUP
00 − Coding Reference Table ).
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the ETACS-ECU. Then go to Step
5.
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U0101 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 5 .
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 5. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U0101 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
Code No.U0121: ABS/ASC 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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
OPERATION
4WD-ECU communicates with the ABS/ASC-ECU
via the CAN bus lines.
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• The signal sent from the ABS/ASC-ECU cannot
be received for a certain period.
PROBABLE CAUSES
• Malfunction of the CAN bus line
• Malfunction of power supply circuit system
(ABS/ASC-ECU)
• Malfunction of ECU (ABS/ASC-ECU)
• Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ).
27C-33
STEP 2. M.U.T.-III other system diagnosis code.
Check the ABS diagnosis code (Refer to GROUP
35B − Troubleshooting ) <Vehicles with ABS> or the
ASC diagnosis code (Refer to GROUP 35C − Troubleshooting ) <Vehicles with ASC>.
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
STEP 3. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U0121 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 4.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U0121 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No.U0126: Steering Wheel Sensor CAN Timeout <ASC>
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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
• When the steering wheel sensor is replaced,
calibrate the steering wheel sensor (Refer to
GROUP 35C − On-vehicle Service ), and reset
the steering wheel sensor correction amount
stored in the 4WD-ECU. (Item No. 1: SAS
adjusted value P.27C-48).
OPERATION
4WD-ECU communicates with the steering wheel
sensor via the CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• The signal sent from the steering wheel sensor
cannot be received for a certain period.
PROBABLE CAUSES
• Malfunction of the CAN bus line
• Malfunction of power supply circuit system (steering wheel sensor)
• Malfunction of the steering wheel sensor
• Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ).
STEP 2. M.U.T.-III data list.
Check the following data list (Refer to P.27C-45).
• Item No.8: Steering angle sensor
Q: Is the check result normal?
27C-34
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
YES : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
NO : Replace the steering wheel sensor (Refer to
GROUP 35C − Steering Wheel Sensor ).
Then go to Step 3.
STEP 3. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U0126 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 4.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U0126 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
OPERATION
4WD-ECU communicates with the ETACS-ECU via
the CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• The signal sent from the ETACS-ECU cannot be
received for a certain period.
PROBABLE CAUSES
• Malfunction of the CAN bus line
• Malfunction of power supply circuit system
(ETACS-ECU)
• Malfunction of ECU (ETACS-ECU)
• Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines. (Refer to GROUP
54C − Troubleshooting ).
STEP 2. M.U.T.-III diagnosis code.
Check the ETACS diagnosis code (Refer to GROUP
54A − Troubleshooting ).
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
STEP 3. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U0141 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 4.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U0141 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
27C-35
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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
OPERATION
STEP 2. M.U.T.-III diagnosis code.
Check the engine diagnosis code (Refer to GROUP
13A − Troubleshooting ).
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
4WD-ECU communicates with the engine-ECU via
the CAN bus lines.
STEP 3. M.U.T.-III data list.
Check the following data list (Refer to P.27C-45).
• Item No.12: Engine speed
DIAGNOSIS CODE SET CONDITION
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
This diagnosis code is set when the abnormality
below is detected:
• Abnormality is detected in the signal received
from the engine-ECU.
PROBABLE CAUSES
•
•
•
•
Malfunction of the CAN bus line
Engine malfunction
Malfunction of engine-ECU
Malfunction of 4WD-ECU
00 − How to Cope with Intermittent
Malfunction ).
NO : Go to Step 4.
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U0401 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 5.
NO : Intermittent malfunction (Refer to GROUP
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ).
00 − How to Cope with Intermittent
Malfunction ).
STEP 5. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U0401 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No.U0428: Steering Wheel Sensor CAN Message <ASC>
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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
• When the steering wheel sensor is replaced,
calibrate the steering wheel sensor (Refer to
GROUP 35C − On-vehicle Service ), and reset
the steering wheel sensor correction amount
stored in the 4WD-ECU. (Item No. 1: SAS
adjusted value P.27C-48).
OPERATION
4WD-ECU communicates with the steering wheel
sensor via the CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• Abnormality is detected in the signal received
from the steering wheel sensor.
PROBABLE CAUSES
• Malfunction of the CAN bus line
• Malfunction of the steering wheel sensor
• Malfunction of 4WD-ECU
27C-36
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
STEP 3. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U0428 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 4.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
54C − Troubleshooting ).
STEP 2. M.U.T.-III data list.
Check the following data list (Refer to P.27C-45).
• Item No.8: Steering angle sensor
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U0428 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
00 − How to Cope with Intermittent
Malfunction ).
NO : Replace the steering wheel sensor (Refer to
GROUP 35C − Steering Wheel Sensor ).
Then go to Step 3.
Code No.U0431: ETACS 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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
• When the ETACS-ECU of vehicles without
KOS is replaced, the encrypted code of the
ignition key needs to be registered to the
ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in
GROUP 54A, Immobilizer System − How to
Register Key ID .)
OPERATION
4WD-ECU communicates with the ETACS-ECU via
the CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• Abnormality is detected in the signal received
from ETACS-ECU.
PROBABLE CAUSES
• Malfunction of the CAN bus line
• Malfunction of ETACS-ECU power supply circuit
system
• ETACS-ECU malfunction
• Malfunction of 4WD-ECU
• Coding not implemented
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ).
STEP 2. M.U.T.-III diagnosis code.
Check if diagnosis code No.U1195 is set (Refer to
P.27C-37).
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
STEP 3. M.U.T.-III other system diagnosis code.
Check the ETACS diagnosis code (Refer to GROUP
54A − Troubleshooting ).
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
STEP 4. M.U.T.-III data list.
Check the ETACS data list below (Refer to GROUP
54A − ETACS ).
• Item No.252: Ambient temperature sensor
• Item No.254: IG voltage
Q: Is the check result normal?
YES : Go to Step 5.
NO : Replace the ETACS-ECU. Then go to Step
27C-37
STEP 5. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U0431 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 6.
NO : Intermittent malfunction. (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 6. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U0431 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
5.
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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
• CAN C-bus off interruption is detected.
PROBABLE CAUSES
• The CAN bus line is defective.
• Malfunction of 4WD-ECU
• ECU malfunction of other system
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
Code No.U1195: Coding 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.
Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
When the diagnosis code No.U1195 is set in
4WD-ECU, the diagnosis code may also be
set in ETACS-ECU. When the diagnosis code
is set in ETACS-ECU, perform the diagnosis
of the diagnosis code for ETACS-ECU first.
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 reg-
istered, the engine cannot be started. Register the encrypted code as described in
GROUP 54A, Immobilizer System − How to
Register Key ID .)
OPERATION
4WD-ECU receives the vehicle information stored in
ETACS-ECU via CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• Coding has not been performed.
PROBABLE CAUSES
• Malfunction of the CAN bus line
• Coding not implemented
27C-38
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
• ETACS-ECU malfunction
• Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ).
STEP 2. M.U.T.-III other system diagnosis code.
Check the ETACS diagnosis code (Refer to GROUP
54A − Troubleshooting ).
STEP 3. ETACS-ECU coding data check
Using the M.U.T.-III, check if there is the
engine-related, T/M-related, ASC-related abnormality to the coding data stored in the ETACS-ECU
(Refer to GROUP 00 − Coding Reference Table ).
Q: Is the check result normal?
YES : Go to Step 4.
NO : Replace the ETACS-ECU. Then go to Step
5.
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U1195 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 5.
NO : Intermittent malfunction (Refer to GROUP
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
00 − How to Cope with Intermittent
Malfunction ).
STEP 5. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U1195 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No.U119A: Chassis No. mismatch
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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
• When the diagnosis code No.U119A is set in
4WD-ECU, the diagnosis code may also be
set in ETACS-ECU. When the diagnosis code
is set in ETACS-ECU, perform the diagnosis
of the diagnosis code for ETACS-ECU first.
OPERATION
4WD-ECU receives the chassis number stored in
ETACS-ECU via CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• The chassis number received from ETACS-ECU
is not correct.
PROBABLE CAUSES
•
•
•
•
•
Malfunction of the CAN bus line
Chassis number not written
ETACS-ECU malfunction
Malfunction of engine-ECU
Malfunction of 4WD-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the 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 line (Refer to GROUP
54C − Troubleshooting ).
STEP 2. M.U.T.-III other system diagnosis code
Check the engine diagnosis code (Refer to GROUP
13A − Troubleshooting ).
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
27C-39
STEP 3. Check whether the diagnosis code is
reset.
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U119A set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Q: Is diagnosis code No.U119A set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Then go to Step 4.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
Code No.U1425: T/M 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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
OPERATION
STEP 2. M.U.T.-III other system diagnosis code.
Check the CVT diagnosis code (Refer to GROUP
23A − CVT, Troubleshooting ).
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
4WD-ECU communicates with CVT-ECU via the
CAN bus lines.
STEP 3. M.U.T.-III data list.
Check the following data list (Refer to P.27C-45).
• Item No.13: A/T Gear position
DIAGNOSIS CODE SET CONDITION
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
This diagnosis code is set when the abnormality
below is detected:
• Abnormality is detected in the gear shift signal
received from the CVT-ECU.
PROBABLE CAUSES
• Malfunction of the CAN bus line
• Malfunction of CVT-ECU
• Malfunction of 4WD-ECU
00 − How to Cope with Intermittent
Malfunction ).
NO : Go to Step 4.
STEP 4. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U1425 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 5.
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
54C − Troubleshooting ).
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 5. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U1425 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
27C-40
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
Code No.U1427: Implausible Wheel Speed 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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
OPERATION
4WD-ECU communicates with the ABS/ASC-ECU
via the CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality
below is detected:
• Abnormality is detected in the wheel speed sensor signal received from the ABS/ASC-ECU.
PROBABLE CAUSES
•
•
•
•
Malfunction of the CAN bus line
Malfunction of the wheel speed sensor
Malfunction of ABS/ASC-ECU
Malfunction of 4WD-ECU
STEP 2. M.U.T.-III other system diagnosis code.
Check the ABS diagnosis code (Refer to GROUP
35B − Troubleshooting ) <Vehicles with ABS> or the
ASC diagnosis code (Refer to GROUP 35C − Troubleshooting ) <Vehicles with ASC>.
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
STEP 3. M.U.T.-III data list.
Check the data list of the relevant wheel speed sensor (Refer to P.27C-45).
• Item No.18: FL Wheel speed sensor
• Item No.19: FR Wheel speed sensor
• Item No.20: RL Wheel speed sensor
• Item No.21: RR Wheel speed sensor
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
NO : Go to Step 4.
DIAGNOSIS PROCEDURE
STEP 4. Check whether the diagnosis code is
reset.
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is diagnosis code No.U1427 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 5.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to GROUP
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
54C − Troubleshooting ).
STEP 5. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U1427 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
Code No.U1428: Sensor Cluster CAN Message <ASC>
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.
• Whenever the ECU is replaced, ensure that
the CAN bus lines are normal.
• Do not drop the G and yaw rate sensor or sub-
ject it to a shock.
• When G and yaw rate sensor is replaced, calibrate G and yaw rate sensor (refer to GROUP
35C − On-vehicle Service )
OPERATION
4WD-ECU receives the G and yaw rate sensor data
from ASC-ECU via the CAN communication.
ELECTRONICALLY CONTROLLED 4WD
27C-41
TROUBLESHOOTING
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the abnormality
below is detected:
• Abnormality is detected in the G and yaw rate
sensor signal received from the ASC-ECU.
PROBABLE CAUSES
• Malfunction of G and yaw rate sensor
• Malfunction of G and yaw rate sensor power supply
• Damaged connector(s)
• Malfunction of the CAN bus line
• Malfunction of 4WD-ECU
• Malfunction of ASC-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines. (Refer to GROUP
54C − Troubleshooting ).
STEP 3. M.U.T.-III diagnosis code.
Check if the diagnosis code No.C123C, C1242 is set
(Refer to P.27C-8).
Q: Is the check result normal?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
STEP 4. M.U.T.-III data list.
Check the data list below (Refer to P.27C-45).
• Item No.22: Yaw rate sensor
• Item No.23: Lateral G sensor
• Item No.24: Longitudinal G sensor
Q: Is the check result normal?
YES : Go to Step 5.
NO : Replace the hydraulic unit (Refer to GROUP
35C − Hydraulic unit (integrated with G and
yaw rate sensor) ). Then go to Step 6.
STEP 5. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U1428 set?
YES : Replace the 4WD-ECU (Refer to P.27C-51).
Then go to Step 6.
STEP 2. M.U.T.-III other system diagnosis code.
Check the ASC diagnosis code (Refer to GROUP
35C − Troubleshooting ).
Q: Is the diagnosis code set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Cope with Intermittent
Malfunction ).
STEP 6. Check whether the diagnosis code is
reset.
Q: Is diagnosis code No.U1428 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
TROUBLE SYMPTOM CHART
M1274000900127
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.
Trouble symptom
Inspection
procedure
Reference pages or
actions
M.U.T.-III cannot communicate with the electronically
controller 4WD system.
1
P.27C-42
Shifting the 4WD switch does not change the mode
2
P.27C-43
The tight corner braking phenomenon* appears with the
4WD switch in the 4WD ECO or 4WD AUTO position.
NOTE: The vehicle is tuned so that the tight corner braking
phenomenon appears at a certain level with the drive mode
in the LOCK position.
3
P.27C-44
27C-42
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
Trouble symptom
Inspection
procedure
Reference pages or
actions
No diagnosis code is set even when the 4WD-E/LOCK
indicator lamps flash.
4
P.27C-45
NOTE: *Tight corner braking phenomenon: When a 4WD vehicle makes sharp cornering in a paved road at
low speed (ex. parallel parking), there is a difference in turning radius between front and rear wheels. If such
a difference can no longer be compensated by tyre slippage, the vehicle behaves as if it is under braking.
SYMPTOM PROCEDURES
Inspection Procedure 1: M.U.T.-III cannot Communicate with the Electronically Controller 4WD
System.
COMMENTS ON TROUBLE SYMPTOM
If M.U.T.-III cannot communicate with the electronically controlled 4WD system, the CAN bus lines may
have a problem. If the electronically controller 4WD
system is not in operation (in case of no 4WD operation), the 4WD-ECU power supply circuit system or
4WD-ECU may have a problem.
PROBABLE CAUSES
• Damaged wiring harness and connectors
• 4WD-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 line (Refer to GROUP
54C − Troubleshooting/CAN Bus
Diagnostics Table ). On completion, go to
Step 2.
STEP 2. Voltage measurement at the 4WD-ECU
connector
(1) Disconnect the 4WD-ECU connector.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between the 4WD-ECU
wiring harness side connector terminals BATT,
IG1 (Ignition switch "ON") and the body earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the connector(s) or terminal(s) or
wiring harness.
STEP 3. Resistance measurement at the
4WD-ECU connector
(1) Disconnect the 4WD-ECU connector.
(2) Measure the resistance between the 4WD-ECU
wiring harness side connector terminals No.
GND1 and the body earth.
OK: Continuity exists (2 Ω or less)
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair the connector(s) or terminal(s) or
wiring harness.
STEP 4. Retest the system.
Q: Does the malfunction occur again?
YES : Replace 4WD-ECU (Refer to P.27C-51).
Then go to Step 5 .
NO : The trouble can be an intermittent
malfunction (Refer to GROUP 00 − How to
Use Troubleshooting/How to Cope with
Intermittent Malfunctions ).
STEP 5. Retest the system.
Q: Does the malfunction occur again?
YES : Diagnose again from Step 1.
NO : This diagnosis is complete.
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
27C-43
Inspection Procedure 2: Shifting the 4WD Switch does not Change the Mode.
COMMENTS ON TROUBLE SYMPTOM
• If the drive mode cannot be switched by pushing
the 4WD switch, the 4WD switch, the wiring harness wires between the 4WD-ECU and the 4WD
switch, the wiring harness wire in the earth circuit
for the 4WD switch, the 4WD-ECU or the combination meter may have a problem.
PROBABLE CAUSES
•
•
•
•
Damaged wiring harness and connectors
Malfunction of 4WD switch
4WD-ECU malfunction
Combination meter malfunction
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics.
Use M.U.T.-III to perform the CAN bus diagnosis.
Q: Is the check result normal?
YES : Go to Step 5
NO : Replace the 4WD switch (Refer to
P.27C-52). Then go to Step 8.
STEP 5. Wiring harness check
(1) Check the wiring harness between the 4WD-ECU
connector (terminal sw-1) and the 4WD switch
connector.
(2) Check the connector(s) or terminal(s) or wiring
harness above for damage or other problem.
Q: Is the check result normal?
YES : Go to Step 6
NO : Repair the connector(s) or terminal(s) or
wiring harness.
Q: Is the check result normal?
YES : Go to Step 3
NO : Repair the CAN bus lines (Refer to GROUP
STEP 6. Resistance measurement at the 4WD
switch connector
(1) Disconnect the 4WD switch connector.
(2) Measure the resistance between the 4WD switch
wiring harness side connector and the body
earth.
OK: Continuity exists (2 Ω or less)
STEP 2. Retest the system.
Q: Is the check result normal?
YES : Go to Step 7
NO : Repair the connector(s) or terminal(s) or
54C − Troubleshooting ). After repairing the
CAN bus line, go to Step 2.
Q: Does the malfunction occur again?
YES : The trouble can be an intermittent
malfunction (Refer to GROUP 00 − How to
Use Troubleshooting/How to Cope with
Intermittent Malfunctions ).
NO : Go to Step 3
STEP 3. M.U.T.-III actuator test.
Combination meter item No.5: Meter illumination
(Refer to GROUP 54A − Combination Meter ).
Q: Is the check result normal?
YES : Go to Step 4
NO : Replace the combination meter. (Refer to
GROUP 54A − Combination Meter ). Then
go to Step 8.
STEP 4. Resistance measurement between the
4WD switch connector terminals
(1) Remove the 4WD switch (Refer to P.27C-52).
(2) Measure the resistance between the terminals
(Refer to P.27C-52).
wiring harness.
STEP 7. M.U.T.-III data list.
Check the following data list. (Refer to P.27C-45).
• Item 1: AWC (4WD) control mode
Q: Is the check result normal?
YES : Go to Step 9
NO : Go to Step 8
STEP 8. Retest the system.
Q: Does the malfunction occur again?
YES : Replace 4WD-ECU (Refer to P.27C-51).
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. Retest the system.
Q: Does the malfunction occur again?
27C-44
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
YES : Troubleshoot the combination meter multi
information display (Refer to GROUP 54A −
Troubleshooting/CAN Bus Diagnostics
Table ). Then diagnose again from Step 1.
NO : This diagnosis is complete.
Inspection Procedure 3: The Tight Corner Braking Phenomenon* Appears with the 4WD switch in the
4WD ECO or 4WD AUTO Position.
NOTE: .
• *Tight corner braking phenomenon: When a 4WD
vehicle makes sharp cornering in a paved road at
low speed (ex. parallel parking), there is a difference in turning radius between front and rear
wheels. If such a difference can no longer be
compensated by tyre slippage, the vehicle
behaves as if it is under braking.
• The vehicle is tuned so that the tight corner braking phenomenon appears at a certain level with
the drive mode in the LOCK position.
COMMENTS ON TROUBLE SYMPTOM
If the tight corner braking phenomenon occurs only
with the 4WD switch being on the 4WD ECO, 4WD
AUTO position, the data received by 4WD-ECU from
each ECU, the electronic control coupling, or
4WD-ECU may have a problem.
PROBABLE CAUSES
• Malfunction of electronic control coupling
• Malfunction of data transmitted from ABS or ASC
system
• Malfunction of data transmitted from the engine
control system
• Wheel speed sensor malfunction
• Steering wheel sensor malfunction
• 4WD-ECU malfunction
• 4WD switch malfunction
DIAGNOSIS PROCEDURE
STEP 1. Check for the tight corner braking
phenomenon occurrence during driving on a flat
road
Check if the tight corner braking phenomenon occurs
during driving on a flat road with the 4WD switch
being on the 4WD ECO or 4WD LOCK position.
Q: Does the tight corner braking phenomenon occur?
YES : Go to Step 2.
NO : This diagnosis is complete.
STEP 2. Wiring harness check
(1) Check the wiring harness between the 4WD-ECU
connector (terminal SOL+, SOL-) and the
electronic control coupling solenoid connector for
damage or other problem.
(2) Check the connector(s) or terminal(s) or wiring
harness above for damage or other problem.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the connector(s) or terminal(s) or
wiring harness.
STEP 3. M.U.T.-III data list
Check the data list for the items below (Refer to
P.27C-45).
• Item No.8: Steering angle sensor
• Item No.11: Accelerator position
• Item No.18: FL wheel speed sensor
• Item No.19: FR wheel speed sensor
• Item No.20: RL wheel speed sensor
• Item No.21: RR wheel speed sensor
• Item No.22: Yaw rate sensor
• Item No.23: Lateral G sensor
Q: Is the check result normal?
YES : Go to Step 5.
NO : Perform the troubleshooting of the ABS
system (Refer to GROUP 35B −
Troubleshooting/Diagnosis Code Chart
<Vehicles with ABS>), the ASC system
(Refer to GROUP 35C −
Troubleshooting/Diagnosis Code Chart
<Vehicles with ASC>) or the engine control
system (Refer to GROUP 13A −
Troubleshooting/Inspection Chart for
Diagnosis Code . Then go to Step 4.
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
STEP 4. Check for the tight corner braking
phenomenon occurrence during driving on a flat
road
Check if the tight corner braking phenomenon occurs
during driving on a flat road with the 4WD switch
being on the 4WD ECO.
Q: Does the tight corner braking phenomenon occur?
YES (Coil current in the electronic control coupling
solenoid is 0 A) : Measure the coil current when
the tight corner braking occurs. If the coil
current measures 0 A, replace the electronic
control coupling (Refer to P.27C-53). Then
go to Step 5.
YES (Coil current in the electronic control coupling
solenoid is other than 0 A) : Measure the coil
current when the tight corner braking
occurs. If the coil current is other than 0 A,
go to Step 5.
NO : This diagnosis is complete. Then go to Step
6.
27C-45
STEP 5. Retest the system.
Q: Does the malfunction occur again?
YES : Replace 4WD-ECU (Refer to P.27C-51).
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 ).
STEP 6. Retest the system.
Q: Does the malfunction occur again?
YES : Replace the electronic control coupling
(Refer to P.27C-53). Then go to Step 7.
NO : This diagnosis is complete.
STEP 7. Retest the system.
Q: Does the malfunction occur again?
YES : Diagnose again from Step 1.
NO : This diagnosis is complete.
Inspection Procedure 4: No Diagnosis Code is set even when the 4WD-E/LOCK Indicator Lamps flash.
COMMENTS ON TROUBLE SYMPTOM
• In case that the 4WD-E/LOCK indicator flashes
but no diagnosis code is set, the 4WD-ECU
power supply circuit system may have a problem.
• If the 4WD-ECU power supply voltage is approximately 6 V or less when the system is in operation (always), the CPU of 4WD-ECU
automatically shuts down. At this time, if the 4WD
control is in operation, the system will switch the
drive mode into 2WD gradually to protect the
drive train. 4WD-ECU cannot set the diagnosis
code because the CPU shuts down. In addition,
the combination meter determines the 4WD-ECU
time-out, and flashes both 4WD-E/LOCK indicators.
PROBABLE CAUSES
• Damaged wiring harness and connectors
• 4WD-ECU malfunction
DIAGNOSIS PROCEDURE
position to the "ON" position.
(2) Check that the 4WD-E/LOCK indicator lamps
flash simultaneously when the drive mode
selector is switched to 4WD ECO, or 4WD LOCK
position.
Q: Does the 4WD-E/LOCK Indicator Lamps flash
simultaneously?
YES : • When the drive system fluid temperature
warning display illuminates in the
combination meter, cool down the
electronic control coupling.
• When the drive system fluid temperature
warning display does not illuminate in
the combination meter, referring to
"Inspection Procedure 1: M.U.T.-III
cannot Communicate with the
Electronically Controller 4WD
System<ECU power supply circuit
system check> ", perform the check
P.27C-42.
NO : Referring to the Inspection Chart for Trouble
Symptoms, perform the check P.27C-41.
STEP 1. Check if 4WD/LOCK Indicator Lamps
DATA LIST REFERENCE TABLE
flash simultaneously
M1274001000161
(1) Turn the ignition switch from the "LOCK" (OFF)
M.U.T.-III can read the following items among various control data (input data from each ECU and switch)
used by the electronic control 4WD system.
27C-46
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
THE SYSTEM IS NORMAL.
Item
No.
Display on M.U.T.-III
Check conditions
Normal condition
1
AWC control mode (4WD control
mode)
4WD is selected (displayed on multi
information display).
4WD ECO
4WD AUTO
4WD LOCK
5
Centre coupling current
Perform a test run of the vehicle.
0−3A
6
AWC protection control (4WD
protection control)
Correct
OFF
Malfunction
ON
AWC system fail (4WD system fail)
Correct
OFF
Malfunction
ON
7
8
Steering angle sensor
Steering wheel steered
Within a
predetermined
steering angle
9
Steering angle speed
Steering wheel: Without steering
wheel operation
0 deg/s
Steering wheel: With steering wheel
operation
Changes depending
on the turning
speed.
Normal
Correct
Faulty
Malfunction
Neutral point not learned
Neutral not learned
Neutral point not learned or failed
Neutral not learned
and Malfunction
Release the accelerator pedal
Approximately 0%
Depress the accelerator pedal
0 − 100%
Accelerator pedal fully opened
Approximately
100%
10
11
Steering angle sensor (status)
Accelerator position
12
Engine speed
Idling and test run
0 − Maximum
engine speed
13
A/T gear position
Gear range: P
P
Gear range: R
R
Gear range: N
N
Gear range: 1st
1st
Gear range: 2nd
2nd
Gear range: 3rd
3rd
Gear range: 4th
4th
Gear range: 5th
5th
Gear range: 6th
6th
Gear range: 7th
7th
ELECTRONICALLY CONTROLLED 4WD
27C-47
TROUBLESHOOTING
Item
No.
Display on M.U.T.-III
Check conditions
Normal condition
14
FL wheel speed (raw value)
− (reference because of r/min)
−
15
FR wheel speed (raw value)
16
RL wheel speed (raw value)
17
RR wheel speed (raw value)
18
FL wheel speed sensor
Perform a test run of the vehicle.
19
FR wheel speed sensor
20
RL wheel speed sensor
Nearly the same as
the speedometer
display
21
RR wheel speed sensor
22
Yaw rate sensor
When the vehicle is stationary
Approximately 0
deg/s
Perform a test run of the vehicle.
−90 − 90 deg/s
Vehicle is stopped (horizontal state).
Approximately 0
m/s2
Perform a test run of the vehicle.
−10.24 − 10.08 m/s2
Vehicle is stopped (horizontal state).
Approximately 0
m/s2
Perform a test run of the vehicle.
−10.24 − 10.08 m/s2
Brake pedal: Depressed
ON
Brake pedal: Released
OFF
Parking brake lever: Pulled
ON
Parking brake lever: Released
OFF
Ignition switch: ACC
ACC
Ignition switch: ON
ON
Ignition switch: START
START
23
24
28
29
30
Lateral G sensor
Longitudinal G sensor
Brake switch (CAN input)
Parking brake SW (CAN input)
Ignition SW (CAN input)
31
Battery voltage (CAN input)
Ignition switch: ON
6 − 17 V
32
IOD fuse (CAN input)
Fuse inserted
ON
Fuse removed
OFF
33
Odometer (CAN input)
Ignition switch: ON
0 − 1,677,721.4 km
34
Ambient temperature (CAN input)
Ignition switch: ON
-30 °C − 85 °C
35
Ignition off time (CAN input)
After ignition switch: OFF for one
minute or more, ignition switch: ON
0 − 254 min
38
IG1
Ignition switch: ON
ON
Ignition switch: OFF
OFF
39
ECU power supply voltage
Ignition switch: ON
10 − 18.75 V
40
Output load voltage
Ignition switch: ON
10 − 18.75 V
41
Mode SW
4WD SW : OFF
OFF
4WD SW : ON
ON
44
SAS (adjusted value)
Ignition switch: ON
−15 − 15 deg
45
Chassis Number writing counter
Ignition switch: ON
Writing count
27C-48
ELECTRONICALLY CONTROLLED 4WD
TROUBLESHOOTING
Item
No.
Display on M.U.T.-III
Check conditions
46
Chassis Number (original) lock
Ignition switch:
ON
Normal condition
Locked
Lock
Unlocked
Unlock
47
Mileage counter
Ignition switch: ON
Counter value
48
Coding counter
Ignition switch: ON
0 − 255 times
SYSTEM SHUT-DOWN
SPECIAL FUNCTION
M.U.T.-III display data does not agree with the actual
RESET
data when 4WD-ECU deactivates the 4WD control
function by the fail-safe function.
Item Display on M.U.T.-III
Initialization contents
No.
M1274013500011
1
SAS adjusted value
Resets the steering wheel sensor neutral position learned value.
3
Centre coupling estimated temp.
Reset the estimated temperature of centre coupling.
TEST
Item Display on M.U.T.-III
No.
4
Control OFF
6
Centre coupling
operation check
Test content
Normal conditions
The electronic control coupling
(centre) operation stops
Refer to the electronic control coupling
(centre) operation check.
Drive the electronic control
Maximum 60 seconds
coupling (centre) with control
current of 3 A.
• A system malfunction is detected.
1. The test can be performed only when all the
• The forced activation time has elapsed.
following conditions are satisfied.
• M.U.T.-III is removed.
• Every wheel speed sensor input is 20 km/h or
• M.U.T.-III clear key is operated.
less.
The sensor neutral position learned value initializa• No system malfunction is detected.
tion can be performed only when the vehicle is
• The steering angle of steering wheel is within
stopped.
±30° from the neutral position.
2. With the test, when any of the conditions below is
CHECK AT ECU TERMINALS
met, the forced activation will be cancelled.
M1274001300139
• Any of the wheel speed sensors detects an input
of 20 km/h or more (excluding item No. 4 "Control
OFF").
ACB05609
ELECTRONICALLY CONTROLLED 4WD
27C-49
ON-VEHICLE SERVICE
Termin Termi
al No.
nal
code
Inspection Item
Check condition
1
Electronic control
coupling solenoid
(centre)
Using M.U.T.-III, perform "Test Item No. 4: 1 V or less
Control OFF" of "SPECIAL FUNCTION"
SOL+
Normal condition
Using M.U.T.-III, perform "Test Item No. 6: Approximately 8 V
Centre coupling operation check" of
"SPECIAL FUNCTION"
3
BATT
Power supply
Always
System voltage
4
IG1
Ignition switch
Ignition switch: ON
System voltage
Ignition switch: OFF
1 V or less
5
CANH CAN-H
−
−
9
SOL-
Electronic control
coupling solenoid
(centre)
Always
1 V or less
10
GND1
Earth
Always
1 V or less
13
CANL
CAN-L
−
−
16
SW-1
4WD switch signal
Ignition switch: ON
4WD switch: ON
System voltage
4WD switch: OFF
1 V or less
ON-VEHICLE SERVICE
CHECK OF ELECTRONIC CONTROL
COUPLING
M1274005700225
SIMPLE OPERATION CHECK OF ELECTRONIC CONTROL COUPLING
CAUTION
The following checks in the 4WD mode must be
completed within one minute in total to protect
the 4WD drive system components and parking
brake.
1. Raise the vehicle.
Marking
ACB05570AB
2. Mark the front and rear tyres for easy
identification of tyre rotation.
3. Adjust the parking brake lever to the normal
conditions. (Refer to GROUP 36 − On-vehicle
Service, Parking Brake Lever Stroke Check and
Adjustment ).
4. Pull the parking brake lever by two notches. Then
start the engine.
NOTE: Activating the parking brake slightly prevents the drive force transferring to the rear
wheels by a friction in the electronic control coupling. If the following 2WD mode is checked without the parking brake activation, the drive force is
transferred to the rear wheels by a friction in the
electronic control coupling.
5. Execute the special test (item No. 4: control off)
(Refer to P.27C-48) to switch the drive mode into
2WD forcibly.
6. Move the shift lever into the selector lever into D
position.
7. Depress the accelerator pedal gradually, and
maintain the vehicle speed at approximately 10
km/h. (Make sure that the rear wheels do not
rotate).
8. Stop the engine.
9. Start the engine again, and move the shift lever
into the selector lever into D position.
27C-50
ELECTRONICALLY CONTROLLED 4WD
ON-VEHICLE SERVICE
10.Depress the accelerator pedal gradually, and
maintain the vehicle speed at approximately 10
km/h.
11.Switch the 4WD switch to "4WD AUTO" position,
and check that the rear wheels are rotating.
After the above checks are completed, if the rear
wheel rotation satisfies the above conditions, it is
judged that the electronic control coupling operates
correctly. If the rear wheel rotation does not satisfy
the above conditions, replace the electronic control
coupling. (Refer to P.27C-53.)
RESISTANCE MEASUREMENT BETWEEN
ELECTRONIC CONTROL COUPLING
SOLENOID CONNECTOR TERMINALS
Electronic
control coupling
1 2
D-113-1
AC707679 AC
Disconnect the electronic control coupling solenoid
connector, and measure the resistance value
between the connector terminals on the unit side. If
the measured resistance value is out of the standard
value range, replace the electronic control coupling.
(Refer to P.27C-53.)
Standard value: 2.2 − 4.0 Ω
ELECTRONICALLY CONTROLLED 4WD
27C-51
4WD-ECU
4WD-ECU
REMOVAL AND INSTALLATION
M1274001600141
Pre-removal and post-installation operation
Removal and installation of the bottom cover assembly and
glove box (Refer to GROUP 52A − Instrument Panel
Assembly .)
11 ± 4 N·m
1
2
ACB04915 AB
1.
2.
Removal steps
4WD-ECU
4WD-ECU bracket
ELECTRONICALLY CONTROLLED 4WD
27C-52
4WD SWITCH
4WD SWITCH
REMOVAL AND INSTALLATION
M1274009800019
1
4
3
2.5 ± 0.5 N·m
2
ACB04916 AB
1.
2.
3.
4.
Removal steps
Front floor console panel (Refer to
GROUP 52A Front Floor Console
Assembly )
Connector connection
Bezel
4WD switch
4WD SWITCH CHECK
M1274009900016
ACB04917AB
Item
When the 4WD When the 4WD
switch is
switch is
released (Not
pressed
being operated)
Continuity
between
terminal No. 2
and No. 6
No continuity
Continuity
between
terminal No. 3
and No. 10
Continuity exists Continuity exists
Continuity exists
(2 Ω or less)
ELECTRONICALLY CONTROLLED 4WD
ELECTRONIC CONTROL COUPLING
27C-53
ELECTRONIC CONTROL COUPLING
REMOVAL AND INSTALLATION
M1274002100150
Differential
side
3
4
Electronic control
coupling side
6
1
7
5
54 ± 5 N·m
Semi-drying sealant:
ThreeBond 1215, 1216, 1217 or
equivalent
4
48 ± 6 N·m
2
7.9 ± 0.9 N·m
ACB04914 AB
1.
>>A<<
2.
3.
4.
5.
6.
7.
Removal steps
Propeller shaft assembly (Refer to
GROUP 25 − Propeller Shaft ).
Cover
Breather hose connection
Connector connection
Bracket
Electronic control coupling
Wave washer
INSTALLATION SERVICE POINT
>>A<< ELECTRONIC CONTROL COUPLING INSTALLATION
A
Electronic control
coupling
ACB06011AB
1. Check that the length of the electronic control
coupling stud bolt (A) is within the standard value
range.
Standard value: 21.6 − 24.4 mm
2. If it exceeds either of the limits, clean the threads
for the electronic control coupling and replace the
stud bolt.
Tightening torque: 13 ± 2 N⋅m
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