Mitsubishi Lancer Evolution X. Manual — part 498
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
TSB Revision
MANUAL TRANSAXLE
22A-85
STEP 2. Scan tool service data
Item No.11: Steering wheel sensor (Refer to service data refer-
ence table
Q: Is the check result normal?
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 DTC is reset.
Q: Is DTC No. U0126 set?
YES : Replace the AWC-ECU. (Refer to
go to Step 4.
NO : Intermittent malfunction. (Refer to GROUP 00 − How
to Cope with Intermittent Malfunction
.)
STEP 4. Check whether the DTC is reset.
Q: Is DTC No. U0126 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
DTC U0141: ETACS Time-out Error
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnostic trouble 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
AWC-ECU communicates with the ETACS-ECU via
the CAN bus lines.
.
DTC SET CONDITIONS
The code is set when the signal sent from the
ETACS-ECU cannot be received for a certain period.
.
PROBABLE CAUSES
• The CAN bus line is defective.
• Malfunction of the ETACS-ECU
• Malfunction of AWC-ECU
DIAGNOSTIC PROCEDURE
STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines. (Refer to GROUP 54C −
Troubleshooting
.)
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
TSB Revision
MANUAL TRANSAXLE
22A-86
STEP 2. Scan tool diagnostic trouble code
Check the ETACS diagnostic trouble code. (Refer to GROUP
54A − Troubleshooting
.)
Q: Is the DTC set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
STEP 3. Check whether the DTC is reset.
Q: Is DTC No. U0141 set?
YES : Replace the AWC-ECU.(Refer to
.) Then
go to Step 4.
NO : Intermittent malfunction. (Refer to GROUP 00 − How
to Cope with Intermittent Malfunction
.)
STEP 4. Check whether the DTC is reset.
Q: Is DTC No. U0141 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
DTC U0401: Engine Data Error
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnostic trouble 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
AWC-ECU communicates with the engine control
module via the CAN bus lines.
.
DTC SET CONDITIONS
The code is set when abnormality is detected in the
signal received from the engine control module.
.
PROBABLE CAUSES
• The CAN bus line is defective.
• Engine malfunction
• Malfunction of AWC-ECU
DIAGNOSTIC PROCEDURE
STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines. (Refer to GROUP 54C −
Troubleshooting
.)
STEP 2. Scan tool diagnostic trouble code
Check the engine diagnostic trouble code. (Refer to GROUP
13A − Troubleshooting
Q: Is the DTC set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 3.
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
TSB Revision
MANUAL TRANSAXLE
22A-87
STEP 3. Scan tool service data
Check the following service data. (Refer to service data refer-
ence table
• Item No.15: Engine speed
• Item No. 16: Engine torque (Driver request value)
Q: Is the check result normal?
YES : Intermittent malfunction. (Refer to GROUP 00 − How
to Cope with Intermittent Malfunction
.)
NO : Go to Step 4.
STEP 4. Check whether the DTC is reset.
Q: Is DTC No. U0401 set?
YES : Replace the AWC-ECU. (Refer to
go to Step 5.
NO : Intermittent malfunction. (Refer to GROUP 00 − How
to Cope with Intermittent Malfunction
.)
STEP 5. Check whether the DTC is reset.
Q: Is DTC No. U0401 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
DTC U0428: Steering Wheel Sensor Data Error
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnostic trouble 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 initialize the steering angle correction
amount stored in AWC-ECU. (Item No.1:
Steering angle correction amount initializa-
tion
.
OPERATION
AWC-ECU communicates with the steering wheel
sensor via the CAN bus lines.
.
DTC SET CONDITIONS
The code is set when abnormality is detected in the
signal received from the steering wheel sensor.
.
PROBABLE CAUSES
• The CAN bus line is defective.
• Malfunction of steering wheel sensor
• Malfunction of AWC-ECU
DIAGNOSTIC PROCEDURE
STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines. (Refer to GROUP 54C −
Troubleshooting
.)
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
TSB Revision
MANUAL TRANSAXLE
22A-88
STEP 2. Scan tool service data
Item No.11: Steering wheel sensor (refer to
Q: Is the check result normal?
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 DTC is reset.
Q: Is DTC No. U0428 set?
YES : Replace the AWC-ECU.(Refer to
.) Then
go to Step 4.
NO : Intermittent malfunction. (Refer to GROUP 00 − How
to Cope with Intermittent Malfunction
.)
STEP 4. Check whether the DTC is reset.
Q: Is DTC No. U0428 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
DTC U0431: ETACS Data Error
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect diagnostic trouble 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
AWC-ECU communicates with the ETACS-ECU via
the CAN bus lines.
.
DTC SET CONDITIONS
The code is set when abnormality is detected in the
signal received from the ETACS-ECU.
.
PROBABLE CAUSES
• The CAN bus line is defective.
• Malfunction of the ETACS-ECU
• Malfunction of AWC-ECU
DIAGNOSTIC PROCEDURE
STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 2.
NO : Repair the CAN bus lines. (Refer to GROUP 54C −
Troubleshooting
.)
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