Mitsubishi Lancer Evolution IX. Manual - part 603

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-95

OPERATION

The 4WD-ECU receives a signal from the parking 
brake switch whether the parking brake lever is 
pulled or released.

DIAGNOSIS CODE SET CONDITIONS

Code No.63 is set when the parking brake switch is 
ON for more than 15 minutes with the vehicle speed 
above 15 km/h.

PROBABLE CAUSES

• Malfunction of parking brake switch

• Damaged harness wires and connectors

• Malfunction of the ABS-ECU

• Malfunction of the 4WD-ECU

DIAGNOSIS

STEP 1. M.U.T.-II/III data list
Item 62: Parking brake switch (Refer to data list ref-
erence 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.

STEP 2. Measure the voltage at 4WD-ECU 
connector C-26.
(1) Turn the ignition switch to the ON position.

(2) Measure the voltage between 4WD-ECU 

connector C-26 terminal No.37 and earth.

OK:

Release the parking brake lever: System 

voltage

Pull the parking brake lever: 1 V or less

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Go to Step 5.

STEP 3. Connector check: C-26 4WD-ECU 
connector.

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

STEP 4. M.U.T.-II/III data list
Item 62: Parking brake switch (Refer to data list ref-
erence 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.

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>

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-96

STEP 5. Connectors check: B-118 ABS-ECU 
connector, C-23 J/C (4), C-26 4WD-ECU 
connector, C-124 intermediate connector, D-28 
parking brake switch connector <LH drive 
vehicles> or B-118 ABS-ECU connector, C-26 
4WD-ECU connector, C-122 intermediate 
connector, D-28 parking brake switch connector 
<RH drive vehicles>.

AC311020

Harness side

B-118 
(B)

AB

Connector: B-118

<LH drive vehicles>

<RH drive vehicles>

B-118 
(GR)

B-118

AC311015AK

Connector: C-23 <LH drive vehicles>

C-23 (B)

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>

AC311015AB

Connector: C-124 <LH drive vehicles>

C-124

AC311016AE

Connector: C-122 <RH drive vehicles>

C-122 (L)

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-97

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

STEP 6. Check the harness between 4WD-ECU 
connector C-26 terminal No.37 and parking brake 
switch connector D-28 terminal No.1.

Check the output line for short or open circuit.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

AC311048

<LH drive vehicles>

Switch side

D-28 (B)

AD

Connector: D-28

<RH drive vehicles>

D-28 (B)

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>

AC311048

<LH drive vehicles>

Switch side

D-28 (B)

AD

Connector: D-28

<RH drive vehicles>

D-28 (B)

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-98

STEP 7. Check the harness between ABS-ECU 
connector B-118 terminal No.1 and parking brake 
switch connector D-28 terminal No.1.

Check the output line for short or open circuit.

Q: Is the check result normal?

YES : 

Go to Step 4.

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

AC311048

<LH drive vehicles>

Switch side

D-28 (B)

AD

Connector: D-28

<RH drive vehicles>

D-28 (B)