Mitsubishi Evolution X. Manual - part 353

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

TSB Revision

MANUAL TRANSAXLE

22A-61

STEP 12. Check whether the DTC is reset.
Q: Is DTC No. C161E set?

YES : Replace the hydraulic unit. (Refer to GROUP 27 

− 

Hydraulic Unit 

P.27-58

.) Then go to Step 13.

NO :  Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

.)

STEP 13. Check whether the DTC is reset.
Q: Is DTC No. C161E set?

YES : Replace the AWC-ECU.(Refer to 

P.22A-132

.) Then 

go to Step 14.

NO :  This diagnosis is complete.

STEP 14. Check whether the DTC is reset.
Q: Is DTC No. C161E set?

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

DTC C1622: ACD Controlled System (Malfunction)

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 provides power supply to the ACD pro-
portioning valve.

.

DTC SET CONDITIONS

After protecting the ACD clutch, the code is set when 
the current value of the ACD proportioning valve 
solenoid exceeds the specified value for a prolonged 
period.

.

PROBABLE CAUSES

• The driving and road conditions are severe.

• 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-14

.) After repairing the CAN 

bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. C1622 set?

YES : Go to Step 3.
NO :  This diagnosis is complete.

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

TSB Revision

MANUAL TRANSAXLE

22A-62

STEP 3. Scan tool diagnostic trouble code
Check other AWC diagnostic trouble code.(Refer to 

P.22A-11

.)

Q: Is the DTC set?

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

STEP 4. Check whether the DTC is reset.
Q: Is DTC No. C1622 set?

YES : Replace the AWC-ECU.(Refer to 

P.22A-132

.) Then 

go to Step 5.

NO :  This diagnosis is complete. (The clutch protection 

activated in such driving or road condition as ACD 
control is applied for a prolonged period.)

STEP 5. Check whether the DTC is reset.
Q: Is DTC No. C1622 set?

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

DTC C1623: Brake Controlled System (Malfunction)

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 controls brakes for AYC control.

.

DTC SET CONDITIONS

The code is set when the AYC brake control oper-
ates for a prolonged period.

.

PROBABLE CAUSES

• 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-14

.) After repairing the CAN 

bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. C1623 set?

YES : Go to Step 3.
NO :  This diagnosis is complete.

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

TSB Revision

MANUAL TRANSAXLE

22A-63

STEP 3. Scan tool diagnostic trouble code
Check other AWC diagnostic trouble code.(Refer to 

P.22A-11

.)

Q: Is the DTC set?

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

STEP 4. Check whether the DTC is reset.
Q: Is DTC No. C1623 set?

YES : Replace the AWC-ECU.(Refer to 

P.22A-132

.) 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. C1623 set?

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

DTC C1624: AWC-ECU System (Internal Malfunction)

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 monitors the malfunction in the ECU.

.

DTC SET CONDITIONS

The code is set when a malfunction is found in 
AWC-ECU.

.

PROBABLE CAUSES

• 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-14

.) After repairing the CAN 

bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. C1624 set?

YES : Go to Step 3.
NO :  This diagnosis is complete.

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

TSB Revision

MANUAL TRANSAXLE

22A-64

STEP 3. Scan tool diagnostic trouble code
Check other AWC diagnostic trouble code.(Refer to 

P.22A-11

.)

Q: Is the DTC set?

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

STEP 4. Check whether the DTC is reset.
Q: Is DTC No. C1624 set?

YES : Replace the AWC-ECU.(Refer to 

P.22A-132

.) 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. C1624 set?

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

DTC C1625: AWC Pressure Sensor System (Abnormal Power Supply Voltage)

.

AWC PRESSURE SENSOR SYSTEM 
CIRCUIT

Refer to 

P.22A-33

.

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 monitors the AWC pressure sensor 
power supply voltage.

.

DTC SET CONDITIONS

The code is set when the power supply voltage to the 
AWC pressure sensor is outside the specified value.

.

PROBABLE CAUSES

• AWC pressure sensor malfunction

• 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-14

.) After repairing the CAN 

bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. C1625 set?

YES : Go to Step 3.
NO :  This diagnosis is complete.