Mitsubishi Lancer Evolution X. Manual — part 490

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

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MANUAL TRANSAXLE

22A-53

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 ACD proportioning valve.

.

DTC SET CONDITIONS

The code is set when the current monitor value of the
ACD proportioning valve solenoid is determined to
be abnormal.

.

PROBABLE CAUSES

• ACD proportioning valve 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-15

.) After repairing the CAN

bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. C161C set?

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

STEP 3. ACD proportioning valve single unit check
Measure the resistance of ACD proportioning valve.

Standard value: 3.7 ± 0.3 Ω

Q: Is the check result normal?

YES : Go to Step 4.
NO : Replace the hydraulic unit. (Refer to GROUP 27 −

Hydraulic Unit

P.27-57

.) Then go to Step 8.

STEP 4. AWC-ECU connector, intermediate connector,
proportioning valve (for ACD) connector check: C-46, D-11,
F-16
Q: Is the check result normal?

YES : Go to Step 5.
NO : Repair the defective connector. Then go to Step 8.

AC708970AT

Connector: F-16

F-16 (B)

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

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MANUAL TRANSAXLE

22A-54

STEP 5. Check the wiring harness between C-46 AWC-ECU
connector terminal No. 1 and F-16 proportioning valve (for
ACD) connector terminal No. 3 and between F-16
proportioning valve (for ACD) connector terminal No. 2
and body ground.
Check the output line and ground line for open or short circuit.
Q: Is the check result normal?

YES : Go to Step 6.
NO : Repair the wiring harness. Then go to Step 8.

STEP 6. Scan tool service data
Item 92: ACD proportional valve indicator current (Refer to ser-
vice data reference table

P.22A-107

.)

Q: Is the check result normal?

YES : Go to Step 7.
NO : Replace the AWC-ECU.(Refer to

P.22A-133

.) Then

go to Step 7.

STEP 7. Check whether the DTC is reset.
Q: Is DTC No. C161C set?

YES : Replace the AWC-ECU.(Refer to

P.22A-133

.) Then

go to Step 8.

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

to Cope with Intermittent Malfunction

P.00-15

.)

STEP 8. Check whether the DTC is reset.
Q: Is DTC No. C161C set?

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

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

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MANUAL TRANSAXLE

22A-55

DTC C161D: Electric Pump Relay Circuit System (Malfunction)

AC902090

FUSIBLE
LINK

35

ELECTRIC
PUMP
RELAY

ELECTRIC
PUMP

AWC-ECU

AWC pump relay circuit system circuit

AB

AC709111

Connector: A-26X

AJ

AC708951CL

Connector: C-21

C-21 (GR)

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

TSB Revision

MANUAL TRANSAXLE

22A-56

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 operates the electric pump via the electric
pump relay.

.

DTC SET CONDITIONS

The code is set when the electric pump relay coil
side circuit is open or shorted.

.

PROBABLE CAUSES

• Electric pump relay 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-15

.) After repairing the CAN

bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. C161D set?

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

AC708950CL

C-46

C-47

Connectors: C-46, C-47

AC708955

Connector: D-12

AY

AC708970AU

Connector: F-14

F-14 (GR)