Content .. 349 350 351 352 ..

Mitsubishi Evolution X. Manual - part 351

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

TSB Revision

MANUAL TRANSAXLE

22A-53

DTC C161C: ACD Proportioning Valve System (Malfunction)

PROPOR-
TIONING
VALVE

FOR ACD
CONTROL

S-AWC-ECU

ACD proportioning valve system

AC708950CG

Connector: C-46

AC708955

Connector: D-11

AC708970AT

Connector: F-16

F-16 (B)

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.

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

TSB Revision

MANUAL TRANSAXLE

22A-54

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-14

.) 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.27-58

.) 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.

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.

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

TSB Revision

MANUAL TRANSAXLE

22A-55

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-132

.) Then

go to Step 7.