Mitsubishi Lancer Evolution X. Manual - part 502

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

TSB Revision

MANUAL TRANSAXLE

22A-101

STEP 7. Check the wiring harness between C-120 AWC 
switch connector terminal No. 2 and C-317 ETACS-ECU 
connector terminal No. 5.
Check the wiring harness for open or short circuit (short to 
ground).
Q: Is the check result normal?

YES : Replace the ETACS-ECU. (Refer to GROUP 54A − 

ETACS-ECU 

P.54A-742

.) Then go to Step 12.

NO :  Repair the wiring harness. Then go to Step 13.

STEP 8. Voltage measurement at C-46 AWC-ECU 
connector
(1) With C-46 AWC-ECU connector connected, measure the 

voltage between terminal No. 21 and ground at the harness 
side.

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

OK: Battery voltage (Press and hold the AWC 

switch)

OK: 1 V or less (Release the AWC switch)

Q: Is the check result normal?

YES : Go to Step 11.
NO :  Go to Step 9.

STEP 9. Intermediate connector, AWC-ECU connector, 
AWC switch connector check: C-42, C-46, C-120
Q: Is the check result normal?

YES : Go to Step 10.
NO :  Repair the defective connector. Then go to Step 13.

STEP 10. Wiring harness check between C-46 AWC-ECU 
connector terminal No. 21 and C-120 AWC switch 
connector terminal No. 1
Check the wiring harness for open or short circuit (short to 
ground).
Q: Is the check result normal?

YES : Replace the AWC-ECU.(Refer to 

P.22A-133

.) Then 

go to Step 13.

NO :  Repair the wiring harness. Then go to Step 11.

STEP 11. Scan tool service data
Combination meter item No. F13, F14, F15: Mode display 
(Refer to GROUP 54A − Combination Meter 

P.54A-88

.)

Q: Is the check result normal?

YES : Go to Step 12.
NO :  Replace the combination meter. (Refer to GROUP 

54A − Combination Meter 

P.54A-110

.) Then go to 

Step 12.

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

TSB Revision

MANUAL TRANSAXLE

22A-102

STEP 12. 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 :  Replace the AWC-ECU.(Refer to 

P.22A-133

.) Then 

go to Step 13.

STEP 13. Retest the system.
Q: Is the check result normal?

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

INSPECTION PROCEDURE 2: Mode does not change even when the AWC switch is pressed <Vehicles 
without steering wheel audio remote control switch>

.

POWER SUPPLY SYSTEM CIRCUIT

Refer to 

P.22A-66

.

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 combination meter
• Damaged harness wires and connectors
• 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 3.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C − 

Troubleshooting 

P.54C-15

.) 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.

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

TSB Revision

MANUAL TRANSAXLE

22A-103

STEP 3. Scan tool service data
Item No. 90, 91: 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-134

.)

Q: Is the check result normal?

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

P.22A-133

.) Then 

go to Step 13.

STEP 5. Measure the voltage at C-214 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 9.
NO :  Go to Step 6.

STEP 6. Voltage measurement at C-46 AWC-ECU 
connector
(1) With C-46 AWC-ECU connector connected, measure the 

voltage between terminal No. 11 and ground at the harness 
side.

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

OK: battery voltage

Q: Is the check result normal?

YES : Go to Step 7.
NO :  Go to Step 12.

STEP 7. AWC-ECU connector, intermediate connector, 
clock spring connector, AWC switch connector check: 
C-46, C-31, C-41, C-202, C-205, C-214
Q: Is the check result normal?

YES : Go to Step 8.
NO :  Repair the defective connector. Then go to Step 13.

STEP 8. Wiring harness check between C-46 AWC-ECU 
connector terminal No. 11 and C-214 AWC switch 
connector terminal No. 2
Check the wiring harness for open or short circuit (short to 
ground).
Q: Is the check result normal?

YES : Go to Step 12.
NO :  Repair the wiring harness. Then go to Step 13.

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

TSB Revision

MANUAL TRANSAXLE

22A-104

STEP 9. AWC-ECU connector, intermediate connector, 
clock spring connector, AWC switch connector check: 
C-46, C-31, C-41, C-202, C-205, C-214
Q: Is the check result normal?

YES : Go to Step 10.
NO :  Repair the defective connector. Then go to Step 13.

STEP 10. Wiring harness check between C-46 AWC-ECU 
connector terminal No. 19 and C-214 AWC switch 
connector terminal No. 4
Check the wiring harness for open circuit.
Q: Is the check result normal?

YES : Go to Step 11.
NO :  Repair the wiring harness. Then go to Step 13.

STEP 11. Scan tool service data
Combination meter item No. F13, F14, F15: Mode display 
(Refer to GROUP 54A − Combination Meter 

P.54A-88

.)

Q: Is the check result normal?

YES : Go to Step 12.
NO :  Replace the combination meter. (Refer to GROUP 

54A − Combination Meter 

P.54A-110

.) Then go to 

Step 12.

STEP 12. 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 :  Replace the AWC-ECU.(Refer to 

P.22A-133

.) Then 

go to Step 13.

STEP 13. Retest the system.
Q: Is the check result normal?

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

INSPECTION PROCEDURE 3: AWC-ECU power supply circuit malfunction

.

POWER SUPPLY SYSTEM CIRCUIT

Refer to 

P.22A-66

.

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

If the S-AWC system does not work, or does not 
communicate with the scan tool, AWC-ECU power 
supply circuit, ground circuit, or AWC-ECU may have 
a problem.

.

PROBABLE CAUSES

• Malfunction of the ETACS-ECU
• Damaged harness wires and connectors
• Malfunction of AWC-ECU