Mitsubishi Lancer Evolution IX. Manual - part 608

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-115

STEP 7. Connector check: B-122 electric pump 
relay connector

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the defective connector.

STEP 8. Check the harness between electric 
pump relay connector B-122 terminal No.4 and 
fusible link No.27.

Check the power supply line for short or open circuit.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the wiring harness.

STEP 9. M.U.T.-II/III actuator test
Item 04: Electric pump drive

OK: Operating sound can be heard.

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.

AC311020

Relay side

B-122

AD

Connector: B-122

<LH drive vehicles>

<RH drive vehicles>

B-122

B-122

AC311020

Relay side

B-122

AD

Connector: B-122

<LH drive vehicles>

<RH drive vehicles>

B-122

B-122

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-116

STEP 10. Connectors check: B-122 electric pump 
relay connector, C-28, C-138 intermediate 
connector, F-20 electric pump connector <LH 
drive vehicles> or B-122 electric pump relay 
connector, C-30 intermediate connector, F-20 
electric pump connector <RH drive vehicles>.

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Repair the defective connector.

AC311020

Relay side

B-122

AD

Connector: B-122

<LH drive vehicles>

<RH drive vehicles>

B-122

B-122

AC311015AL

Connector: C-28, C-138 <LH drive vehicles>

C-28

C-138

C-28

C-138

AC311016AH

Connector: C-30 <RH drive vehicles>

C-30 (GR)

C-30

AC311042

AF

Connector: F-20

F-20 (B)

Pump side

F-20

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-117

STEP 11. Check the harness between electric 
pump relay connector B-122 terminal No.3 and 
earth.

Check the earth line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the wiring harness.

AC311020

Relay side

B-122

AD

Connector: B-122

<LH drive vehicles>

<RH drive vehicles>

B-122

B-122

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-118

SYMPTOM CHART

M1221007100593

Trouble symptom

Inspection 
procedure No.

Reference page

No communication possible between M.U.T.-II/III and all systems 1

P.22A-119

No communication possible between M.U.T.-II/III and 4WD-ECU

2

P.22A-124

ACD mode indicator lamp does not light up when the ignition 
switch is set to "ON" (engine is stopped)

3

P.22A-132

More than two ACD mode indicator lamps remain lit even after the 
engine is started

4

P.22A-138

The ACD does not operate (no diagnostic code)

5

P.22A-141

The AYC does not operate (no diagnostic code)

6

Refer to GROUP 27 
− Symptom Chart 

P.27-23

.

The rear tyre sounds when turning at low speed corners (vehicle 
slows down)

7

Refer to GROUP 27 
− Symptom Chart 

P.27-23

.

Noise is produced from the torque transfer differential during 
turning

8

Refer to GROUP 27 
− Symptom Chart 

P.27-23

.