Mitsubishi Lancer Evolution X. Manual - part 491

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

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MANUAL TRANSAXLE

22A-57

STEP 3. Scan tool actuator test

OK: Operating sound of the electric pump can be 
heard.

Q: Is the check result normal?

YES : Go to Step 8.
NO :  Go to Step 4.

STEP 4. Electric pump relay single unit check
Check the electric pump relay.(Refer to 

P.22A-134

.)

Q: Is the check result normal?

YES : Go to Step 5.
NO :  Replace the electric pump relay. (Refer to 

P.22A-133

.) Then go to Step 9.

STEP 5. Electric pump relay connector, AWC-ECU 
connector check: A-26X, C-46
Q: Is the check result normal?

YES : Go to Step 6.
NO :  Repair the defective connector. Then go to Step 9.

STEP 6. Check the wiring harness between A-26X electric 
pump relay connector terminal No. 3 and C-46 AWC-ECU 
connector terminal No. 20.
Check the power supply line for short or open circuit.
Q: Is the check result normal?

YES : Go to Step 7.
NO :  Check C-47 intermediate connector. When no 

problem is found, repair the wiring harness. Then go 
to Step 9.

STEP 7. Check the wiring harness between A-26X electric 
pump relay connector terminal No. 1 and body ground.
Check the ground line for open circuit.
Q: Is the check result normal?

YES : Go to Step 8.
NO :  Repair the wiring harness. Then go to Step 9.

STEP 8. Check whether the DTC is reset.
Q: Is DTC No. C161D set?

YES : Replace the AWC-ECU.(Refer to 

P.22A-133

.) Then 

go to Step 9.

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

to Cope with Intermittent Malfunction 

P.00-15

.)

STEP 9. Check whether the DTC is reset.
Q: Is DTC No. C161D set?

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

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

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MANUAL TRANSAXLE

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DTC C161E: Electric Pump Relay Circuit System (Stuck)

.

AWC PUMP RELAY SYSTEM CIRCUIT

Refer to 

P.22A-55

.

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.

• Since the fluid in the hydraulic unit will be 

hardened under low temperature, the load of 
the pump increases and the motor may not 
operate normally. Therefore, completely 
remove snow and ice from the hydraulic unit 
and leave the vehicle under temperature of 
0° C (32° F) or higher for 4 hours or more 

before performing the troubleshooting.

.

OPERATION

AWC-ECU controls the electric pump by the informa-
tion from AWC pressure sensor and electric pump 
relay.

.

DTC SET CONDITIONS

The code is set when the electric pump operation 
signal is output from AWC-ECU, and when the AWC 
pressure sensor signal is not reached the specified 
pressure after the specified time has elapsed.

.

PROBABLE CAUSES

• Fluid malfunction (low fluid level)
• AWC pressure sensor malfunction
• Electric pump relay malfunction
• Hydraulic unit malfunction
• Electric pump malfunction
• Damaged harness wires and connectors
• Malfunction of AWC-ECU
• Used under low temperature condition

DIAGNOSTIC PROCEDURE

STEP 1. Check whether the diagnostic trouble code is 
reset.
As for vehicles under low temperature condition, carry out the 
contents of the precautions, and then check the diagnostic trou-
ble code again.
Q: Is diagnosis code No.C161E set?

YES : Go to Step 2.
NO :  This diagnosis is complete.

STEP 2. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?

YES : Go to Step 4.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C − 

Troubleshooting 

P.54C-15

.) After repairing the CAN 

bus line, go to Step 3.

STEP 3. Check whether the DTC is reset.
Q: Is DTC No. C161E set?

YES : Go to Step 4.
NO :  This diagnosis is complete.

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

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MANUAL TRANSAXLE

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STEP 4. Fluid check
Check that the fluid level is adequate. (Refer to GROUP 27 − 

On-vehicle Service 

P.27-28

.)

Q: Is the check result normal?

YES : Go to Step 5.
NO :  Add the fluid. Then go to Step 15.

STEP 5. Scan tool diagnostic trouble code
Check if the AWC diagnostic trouble code No. C1611, C1612, 
C1625, or C161D is set.(Refer to 

P.22A-12

.)

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO :  Go to Step 6.

STEP 6. Scan tool actuator test

OK: Operating sound of the electric pump can be 
heard.

Q: Is the check result normal?

YES : Go to Step 14.
NO :  Go to Step 7.

STEP 7. Electric pump relay single unit check
Check the electric pump relay.(Refer to 

P.22A-134

.)

Q: Is the check result normal?

YES : Go to Step 8.
NO :  Replace the electric pump relay. (Refer to 

P.22A-133

.) Then go to Step 15.

STEP 8. Electric pump relay connector check: A-26X
Q: Is the check result normal?

YES : Go to Step 9.
NO :  Repair the defective connector. Then go to Step 15.

STEP 9. Check the wiring harness between A-26X electric 
pump relay connector terminal No. 2 and fusible link (35).
Check the power supply line for short or open circuit.
Q: Is the check result normal?

YES : Go to Step 10.
NO :  Repair the wiring harness. Then go to Step 15.

STEP 10. Electric pump connector check: F-14
Q: Is the check result normal?

YES : Go to Step 11.
NO :  Repair the defective connector. Then go to Step 15.

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

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MANUAL TRANSAXLE

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STEP 11. Check the wiring harness between A-26X electric 
pump relay connector terminal No. 4 and F-14 electric 
pump connector terminal No. 2.
Check the power supply line for short or open circuit.
Q: Is the check result normal?

YES : Go to Step 12.
NO :  Check C-21 and D-12 intermediate connectors. When 

no problem is found, repair the wiring harness. Then 
go to Step 15.

STEP 12. Check the wiring harness between F-14 electric 
pump connector terminal No. 1 and body ground.
Check the ground line for open circuit.
Q: Is the check result normal?

YES : Go to Step 13.
NO :  Repair the wiring harness. Then go to Step 15.

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

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

Hydraulic Unit 

P.27-57

.) Then go to Step 14.

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

to Cope with Intermittent Malfunction 

P.00-15

.)

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

YES : Replace the AWC-ECU.(Refer to 

P.22A-133

.) Then 

go to Step 15.

NO :  This diagnosis is complete.

STEP 15. Check whether the DTC is reset.
Q: Is DTC No. C161E set?

YES : Return to Step 2.
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