Mitsubishi Evolution X. Manual - part 362

DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>

TSB Revision

MANUAL TRANSAXLE

22A-97

STEP 4. Scan tool service data
Check the service data below.(Refer to 

P.22A-107

.)

• Item No.22: FL wheel speed sensor <FL>

• Item No.23: FL wheel speed sensor <FR>

• Item No.24: FL wheel speed sensor <RL>

• Item No.25: FL wheel speed sensor <RR>

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 5.

STEP 5. Check whether the DTC is reset.
Q: Is DTC No. U1427 set?

YES : Replace the AWC-ECU.(Refer to 

P.22A-132

.) Then 

go to Step 6.

NO :  Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

.)

STEP 6. Check whether the DTC is reset.
Q: Is DTC No. U1415 set?

YES : Return to Step 1.
NO :  This diagnosis is complete.

DTC U1428: G and Yaw Rate 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.

• Do not drop the G and yaw rate sensor or sub-

ject it to a shock.

• When G and yaw rate sensor is replaced, cali-

brate G and yaw rate sensor (refer to GROUP 
35C 

− On-vehicle Service 

P.35C-266

), and ini-

tialize the lateral/longitudinal acceleration 
correction amount stored in AWC-ECU. (Refer 
to item No.10: Lateral acceleration correction 
amount initialization, and No. 11: Longitudinal 
acceleration correction amount initialization 

P.22A-113

.)

.

OPERATION

AWC-ECU communicates with the G and yaw rate 
sensor via the CAN bus lines.

.

DTC SET CONDITIONS

The code is set when abnormality is detected in the 
signal received from the G and yaw rate sensor.

.

PROBABLE CAUSES

• Malfunction of the CAN bus line (local)

• Malfunction of G and yaw rate sensor

• Malfunction of AWC-ECU

DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>

TSB Revision

MANUAL TRANSAXLE

22A-98

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-14

.)

STEP 2. Scan tool diagnostic trouble code
Check if the AWC diagnostic trouble code No. U1003 is 
set.(Refer to 

P.22A-11

.)

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO :  Go to Step 3.

STEP 3. Scan tool diagnostic trouble code
Check if the AWC diagnostic trouble code No. C123C, C1242, 
C2114, C2115, or C2204 is set.(Refer to 

P.22A-11

.)

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO :  Go to Step 4.

STEP 4. Scan tool service data
Check the service data below.(Refer to 

P.22A-107

.)

• Item No. 26: Yaw rate sensor

• Item No. 29: Lateral G sensor

• Item No. 31: Longitudinal G sensor

Q: Is the check result normal?

YES : Go to Step 5.
NO :  Replace the G and yaw rate sensor. (Refer to 

GROUP 35C 

− G and Yaw Rate Sensor 

P.35C-278

.) 

Then go to Step 6.

STEP 5. Check whether the DTC is reset.
Q: Is DTC No. U0428 set?

YES : Replace the AWC-ECU.(Refer to 

P.22A-132

.) Then 

go to Step 6.

NO :  Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

.)

STEP 6. Check whether the DTC is reset.
Q: Is DTC No. U0428 set?

YES : Return to Step 1.
NO :  This diagnosis is complete.

DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>

TSB Revision

MANUAL TRANSAXLE

22A-99

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Communication between the scan tool and AWC-ECU cannot be 
established

CAUTION

• If there is any problem in the CAN bus lines, 

an incorrect trouble symptom may occur. 
Prior to this diagnosis, always diagnose the 
CAN bus lines.

• Whenever the ECU is replaced, ensure that 

the CAN bus lines are normal.

.

COMMENTS ON TROUBLE SYMPTOM

CAN bus line, AWC-ECU power supply circuit, or 
AWC-ECU may have a problem.

.

PROBABLE CAUSES

• Wrong M.U.T.-III wiring harness

• The CAN bus line is defective.

• AWC-ECU power supply circuit malfunction

• Malfunction of AWC-ECU

• ECU malfunction of other system

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?

YES : Check/repair the AWC-ECU power supply 

circuit.(Refer to 

P.22A-104

.)

NO :  Repair the CAN bus lines. (Refer to GROUP 54C 

− 

Troubleshooting 

P.54C-14

.)

INSPECTION PROCEDURE 2: Mode does not change even when the AWC switch is pressed <Vehicles 
with steering wheel audio remote control switch>

.

AWC MODE SELECT SWITCH SYSTEM 
CIRCUIT

Refer to 

P.22A-37

.

CAUTION

• If there is any problem in the CAN bus lines, 

an incorrect trouble symptom may occur. 
Prior to this diagnosis, always diagnose the 
CAN bus lines.

• Whenever the ECU is replaced, ensure that 

the CAN bus lines are normal.

.

COMMENTS ON TROUBLE SYMPTOM

AWC switch or AWC-ECU may have a problem.

.

PROBABLE CAUSES

• AWC switch malfunction

• Malfunction of the ETACS-ECU

• Malfunction of the combination meter

• Damaged harness wires and connectors

• Malfunction of AWC-ECU

DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>

TSB Revision

MANUAL TRANSAXLE

22A-100

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 3.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C 

− 

Troubleshooting 

P.54C-14

.) After repairing the CAN 

bus line, go to Step 2.

STEP 2. Retest the system.
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 3.

STEP 3. Scan tool service data
Item No. 89: AWC switch (Refer to service data reference table 

P.22A-107

.)

Q: Is the check result normal?

YES : Go to Step 11.
NO :  Go to Step 4.

STEP 4. AWC switch single unit check
Check the AWC switch.(Refer to 

P.22A-133

.)

Q: Is the check result normal?

YES : Go to Step 5.
NO :  Replace the AWC switch.(Refer to 

P.22A-132

.) Then 

go to Step 13.

STEP 5. Measure the voltage at C-120 AWC switch 
connector.
(1) Disconnect the connector, and measure the voltage 

between terminal No.2 and ground at the harness side.

(2) Turn the ignition switch to the "ON" position.

OK: Battery positive voltage

Q: Is the check result normal?

YES : Go to Step 8.
NO :  Go to Step 6.

STEP 6. AWC switch connector, ETACS-ECU connector 
check: C-120, C-317
Q: Is the check result normal?

YES : Go to Step 7.
NO :  Repair the defective connector. Then go to Step 13.