Mitsubishi Lancer Evolution IX. Manual - part 605

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-103

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the defective connector.

STEP 8. Check the harness between ABS-ECU 
connector B-118 terminal No.3 and 4WD-ECU 
connector C-26 terminal No.48.

Check the output line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the wiring harness.

AC311020

Harness side

B-118 
(B)

AB

Connector: B-118

<LH drive vehicles>

<RH drive vehicles>

B-118 
(GR)

B-118

AC311002

4WD-ECU

Harness side

C-26 (Y)

AC

Connector: C-26

4WD-ECU

C-26 (Y)

Rear console 
assembly

<LH drive vehicles>

<RH drive vehicles>

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-104

STEP 9. Measure the voltage at ABS-ECU 
connector B-118.
(1) Turn the ignition switch to the ON position.
(2) Execute ABS actuator test (item 05: ABS signal).

(3) Measure the voltage between ABS-ECU 

connector B-118 terminal No.3 and earth.

OK: The voltage remains 1 V or less dur-
ing the actuator test (for 10 seconds) and 
becomes system voltage.

Q: Is the check result normal?

YES : 

Replace the 4WD-ECU.

NO : 

Replace the ABS-ECU.

AC311020

Harness side

B-118 
(B)

AB

Connector: B-118

<LH drive vehicles>

<RH drive vehicles>

B-118 
(GR)

B-118

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-105

Code No.74 Proportional valve system <ACD>

OPERATION

The proportional valve (ACD) controls the hydraulic 
pressure to activate the ACD hydraulic multi plate 
clutch according to signal from the 4WD-ECU.

DIAGNOSIS CODE SET CONDITIONS

Code No.74 is set when open circuit or short circuit 
of the control circuit of the proportional valve has 
occurred.

PROBABLE CAUSES

• Malfunction of proportional valve

• Damaged harness wires and connectors

• Malfunction of the 4WD-ECU

DIAGNOSIS

STEP 1. M.U.T.-II/III data list
Item 11: Proportional valve current <ACD> (Refer to 
data list reference table 

P.22A-142

).

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Cope with Intermittent 

Malfunction 

P.00-5

).

NO : 

Go to Step 2.

PROPORTIONING VALVE
(FOR ACD CONTROL)

<LH DRIVE VEHICLES> OR

<RH DRIVE VEHICLES>

4WD-ECU

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet

Proportioning valve <ACD> system circuit

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-106

STEP 2. Measure the resistance at proportional 
valve connector F-24.

Disconnect the proportional valve connector, and 
measure the resistance between terminal No.2 and 
No.3.

OK: 4.7 

Ω or less

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the hydraulic unit.

STEP 3. Measure the resistance at proportional 
valve connector F-24.

Disconnect the proportional valve connector, and 
measure the resistance between terminal No.2 and 
earth.

OK: 2 

Ω or less

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 4.

STEP 4. Connectors check: F-21 intermediate 
connector, F-24 proportional valve connector.

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the defective connector.

STEP 5. Check the harness between proportional 
valve connector F-24 terminal No.2 and earth.

Check the earth line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the wiring harness.

STEP 6. M.U.T.-II/III data list
Item 11: Proportional valve current <ACD> (Refer to 
data list reference table 

P.22A-142

).

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Cope with Intermittent 

Malfunction 

P.00-5

).

NO : 

Replace the 4WD-ECU.

AC311042

AD

Connector: F-24

F-24 (B)

Valve side

F-24

AC311042

AD

Connector: F-24

F-24 (B)

Valve side

F-24

AC311042

F-21 (B)

AE

Connector: F-21, F-24

F-24 (B)

F-21

Valve side

F-24

AC311042

AD

Connector: F-24

F-24 (B)

Valve side

F-24