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 

P.22A-107

.)

Q: Is the check result normal?

YES : Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

NO :  Replace the steering wheel sensor. (Refer to GROUP 

35C − Steering Wheel Sensor 

P.35C-305

.) 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 

P.22A-133

.) Then 

go to Step 4.

NO :  Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

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 

P.54C-15

.)

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 

P.54A-646

.)

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 

P.22A-133

.) Then 

go to Step 4.

NO :  Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

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 

P.54C-15

.)

STEP 2. Scan tool diagnostic trouble code
Check the engine diagnostic trouble code. (Refer to GROUP 
13A − Troubleshooting 

P.13A-48

.)

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 

P.22A-107

.)

• 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 

P.00-15

.)

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 

P.22A-133

.) Then 

go to Step 5.

NO :  Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

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 

P.35C-289

), 

and initialize the steering angle correction 
amount stored in AWC-ECU. (Item No.1: 
Steering angle correction amount initializa-
tion 

P.22A-114

.)

.

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 

P.54C-15

.)

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 

P.22A-107

.)

Q: Is the check result normal?

YES : Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

NO :  Replace the steering wheel sensor. (Refer to GROUP 

35C − Steering Wheel Sensor 

P.35C-305

.) 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 

P.22A-133

.) Then 

go to Step 4.

NO :  Intermittent malfunction. (Refer to GROUP 00 − How 

to Cope with Intermittent Malfunction 

P.00-15

.)

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 

P.54C-15

.)