Mitsubishi Lancer Evolution IX. Manual - part 607

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-111

STEP 3. Measure the resistance at electric pump 
relay connector B-122.

Disconnect the electric pump relay connector, and 
measure the resistance between terminal No.1 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. Connector check: B-122 electric pump 
relay connector.

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the defective connector.

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-112

STEP 5. Check the harness between electric 
pump relay connector B-122 terminal No.1 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 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.

STEP 7. Connectors check: B-122 electric pump 
relay connector, C-25 4WD-ECU connector.

Check for the contact with terminals.

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

AC311002

4WD-ECU

Harness side

C-25 (Y)

AB

Connector: C-25

4WD-ECU

C-25 (Y)

Rear console 
assembly

<LH drive vehicles>

<RH drive vehicles>

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-113

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.2 and 
4WD-ECU connector C-25 terminal No.16.

Check the power supply line for short or open circuit.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the wiring harness.

Code No.82 Electric pump relay system (electric pump malfunction or pressure sensor defect)

ELECTRIC PUMP RELAY SYSTEM 
CIRCUIT

Refer to 

P.22A-109

.

OPERATION

Refer to 

P.22A-109

.

DIAGNOSIS CODE SET CONDITIONS

Code No.82 is set when the pressure sensor does 
not reach the specified value even if the 4WD-ECU 
has output the electric pump motor drive command.

PROBABLE CAUSES

• Insufficient fluid

• Malfunction of the pressure sensor

• Malfunction of the electric pump relay

• Malfunction of the hydraulic unit

• Damaged harness wires and connectors

• Malfunction of the 4WD-ECU

AC311020

Relay side

B-122

AD

Connector: B-122

<LH drive vehicles>

<RH drive vehicles>

B-122

B-122

AC311002

4WD-ECU

Harness side

C-25 (Y)

AB

Connector: C-25

4WD-ECU

C-25 (Y)

Rear console 
assembly

<LH drive vehicles>

<RH drive vehicles>

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-114

DIAGNOSIS

STEP 1. Check the fluid.
Check that the right amount of fluid is in the reservoir 
tank.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Go to Step 2.

STEP 2. Check the fluid leaks.
Check that the fluid is not leaking.

Q: Is the check result normal?

YES : 

Add the fluid.

NO : 

Repair the leaking part and add the fluid.

STEP 3. M.U.T.-II/III diagnosis code

Q: Are diagnosis codes 45, 46, 47 set?

YES <diagnosis code 45 is set> : 

Refer to 

diagnosis code 45: Pressure sensor system 
(open circuit or short circuit) 

P.22A-41

.

YES <diagnosis code 46 is set> : 

Refer to 

diagnosis code 46: Pressure sensor system 
(open earth) 

P.22A-46

.

YES <diagnosis code 47 is set> : 

Refer to 

diagnosis code 47: Pressure sensor system 
(abnormal power supply) 

P.22A-49

.

NO : 

Go to Step 4.

STEP 4. M.U.T.-II/III diagnosis code

Q: Are diagnosis code 81 set?

YES : 

Refer to diagnosis code 81: Electric pump 

relay system 

P.22A-109

.

NO : 

Go to Step 5.

STEP 5. 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 : 

Go to Step 6.

STEP 6. Measure the voltage at electric pump 
relay connector B-122.

Disconnect the electric pump relay connector, and 
measure the voltage between terminal No.4 and 
earth at the harness side.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Go to Step 7.

AC311020

Relay side

B-122

AD

Connector: B-122

<LH drive vehicles>

<RH drive vehicles>

B-122

B-122