Mitsubishi Evolution X. Manual - part 342

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

TSB Revision

MANUAL TRANSAXLE

22A-17

STEP 5. Check the stop light switch.
Refer to GROUP 35A 

− Brake Pedal 

P.35A-26

.

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Replace the stoplight switch. (Refer to GROUP 35A 

− 

Brake Pedal 

P.35A-25

.) Then go to Step 21.

STEP 6. ETACS-ECU connector check: C-304
Q: Is the check result normal?

YES : Go to Step 7.
NO :  Repair the defective connector. Then go to Step 21.

STEP 7. Measure the voltage at the C-304 ETACS-ECU 
connector.
With C-304 ETACS-ECU connector connected, measure the 
voltage between the terminal No. 1 and the body ground.

OK: Battery voltage (when the brake pedal is released)

Q: Is the check result normal?

YES : Go to Step 10.
NO :  Go to Step 8.

STEP 8. ETACS-ECU fuse No. 2 check
Q: Is the check result normal?

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

− 

ETACS-ECU 

P.54A-676

.) Then go to Step 21.

NO :  Replace fuse No. 2. Then go to Step 9.

STEP 9. Check the wiring harness between C-304 
ETACS-ECU connector terminal No. 1 and C-48 stoplight 
switch connector terminal No. 2.
Check that the wiring harness is not shorted (short to ground).
Q: Is the check result normal?

YES : Go to Step 21.
NO :  Repair the wiring harness. Then go to Step 21.

STEP 10. Stop light switch connector check: C-48
Q: Is the check result normal?

YES : Go to Step 11.
NO :  Repair the defective connector. Then go to Step 21.

STEP 11. Voltage measurement at the C-48 stoplight switch 
connector
Disconnect the connector, and measure the voltage between 
terminal No. 2 and ground at the wiring harness side.

OK: Battery positive voltage

Q: Is the check result normal?

YES : Go to Step 13.
NO :  Go to Step 12.

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

TSB Revision

MANUAL TRANSAXLE

22A-18

STEP 12. Check the wiring harness between C-304 
ETACS-ECU connector terminal No. 1 and C-48 stoplight 
switch connector terminal No. 2.
Check the wiring harness for open circuit.
Q: Is the check result normal?

YES : Go to Step 13.
NO :  Repair the wiring harness. Then go to Step 21.

STEP 13. J/C (4), intermediate connector check: C-43, C-47
Q: Is the check result normal?

YES : Go to Step 14.
NO :  Repair the defective connector. Then go to Step 21.

STEP 14. Voltage measurement at C-43 J/C (4)
Disconnect the connector, and measure the voltage between 
terminal No. 2 and ground at the wiring harness side.

OK: Battery positive voltage (brake pedal depressed)

Q: Is the check result normal?

YES : Go to Step 16.
NO :  Go to Step 15.

STEP 15. Check the wiring harness between C-48 stoplight 
switch connector terminal No. 1 and the C-43 J/C (4) 
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 16.
NO :  Repair the wiring harness. Then go to Step 21.

STEP 16. ETACS-ECU connector check: C-312
Q: Is the check result normal?

YES : Go to Step 17.
NO :  Repair the defective connector. Then go to Step 21.

STEP 17. Measure the voltage at the C-312 ETACS-ECU 
connector.
Measure the voltage between C-312 ETACS-ECU connector 
terminal No. 16 and the body ground.

• OK: 1 V or less (brake pedal released)

• OK: Battery positive voltage (brake pedal 

depressed)

Q: Is the check result normal?

YES : Go to Step 19.
NO :  Go to Step 18.

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

TSB Revision

MANUAL TRANSAXLE

22A-19

STEP 18. Check the wiring harness between C-312 
ETACS-ECU connector terminal No. 16 and C-48 stoplight 
switch connector terminal No. 1.
Check the wiring harness for open circuit.
Q: Is the check result normal?

YES : Go to Step 19.
NO :  Repair the wiring harness. Then go to Step 21.

STEP 19. Scan tool service data
Item No. 39: Stoplight switch (Refer to service data reference 
table 

P.22A-107

.)

Q: Is the check result normal?

YES : Go to Step 20.
NO :  Replace the ETACS-ECU. (Refer to GROUP 54A 

− 

ETACS-ECU 

P.54A-676

.) Then go to Step 21.

STEP 20. Check whether the DTC is reset.
Q: Is DTC No. C1000 set?

YES : Replace the AWC-ECU.(Refer to 

P.22A-132

.) Then 

go to Step 21.

NO :  Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

).

STEP 21. Check whether the DTC is reset.
Q: Is DTC No. C1000 set?

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

DTC C100A <FL>, C1015 <FR>, C1020 <RL>, C102B <RR>: Wheel Speed Sensor System (Faulty 
Circuit)

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 receives the wheel speed data from 
ASC-ECU via the CAN communication.

.

DTC SET CONDITIONS

Observe the wheel speed at startup. If one or more 
of the wheel speed does not follow, the diagnostic 
trouble code of the relevant wheel speed sensor is 
set.

.

PROBABLE CAUSES

• Malfunction of wheel speed sensor

• Damaged harness wires and connectors

• Malfunction of encoder for wheel speed detection

• Malfunction of ASC-ECU

• Malfunction of AWC-ECU

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

TSB Revision

MANUAL TRANSAXLE

22A-20

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. Check whether the DTC is reset.
Q: Is the relevant wheel speed sensor diagnostic trouble 

code No. C100A <FL>, C1015 <FR>, C1020 <RL>, or 
C102B <RR> set?
YES : Go to Step 3.
NO :  This diagnosis is complete.

STEP 3. Scan tool diagnostic trouble code
Check the ASC diagnostic trouble code. (Refer to GROUP 35C 
− Troubleshooting 

P.35C-20

.)

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 of the relevant wheel speed sen-
sor.(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 :  Replace the AWC-ECU.(Refer to 

P.22A-132

.)

DTC C1011 <FL>, C101C <FR>, C1027 <RL>, C1032 <RR>: Wheel Speed Sensor System (Faulty 
Signal)

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 receives the wheel speed data from 
ASC-ECU via the CAN communication.

.

DTC SET CONDITIONS

When an irregular change in the wheel speed sensor 
is detected, the diagnostic trouble code of the rele-
vant wheel speed sensor is set.

.

PROBABLE CAUSES

• Malfunction of wheel speed sensor

• Damaged harness wires and connectors

• Malfunction of encoder for wheel speed detection

• Malfunction of ASC-ECU

• Malfunction of AWC-ECU