Mitsubishi Lancer Evolution IX. Manual - part 595

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-63

STEP 2. Measure the voltage at longitudinal 
G-sensor connector D-38.

(1) Disconnect the longitudinal G-sensor connector, 

and connect special tool harness set (MB991348) 
between the disconnected connectors.

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between terminal No.2 and 

earth.

OK:

When vehicle is stationary (level): 2.4 

− 2.6 

V

When vehicle is being driven: 3.4 

− 3.6 V

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the G-sensor.

STEP 3. Measure the voltage at 4WD-ECU 
connector C-25.
(1) Turn the ignition switch to the ON position.

(2) Measure the voltage between 4WD-ECU 

connector C-25 terminal No.23 and earth.

OK: 2.4 

− 2.6 V (when the vehicle is in 

horizontal state)

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 6.

AC103662AL

MB991348

Connector: D-38
(Harness side)

Label

Label

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-64

STEP 4. Connector check: C-25 4WD-ECU 
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. M.U.T.-II/III data list
Item 14: Longitudinal G-sensor voltage (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.

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-65

STEP 6. Connectors check: B-118 ABS-ECU 
connector, C-25 4WD-ECU connector, C-122 
intermediate connector, D-38 longitudinal 
G-sensor connector.

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the defective connector.

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-25 (Y)

AB

Connector: C-25

4WD-ECU

C-25 (Y)

Rear console 
assembly

<LH drive vehicles>

<RH drive vehicles>

AC311015AC

Connector: C-122 <LH drive vehicles>

C-122

AC311016AE

Connector: C-122 <RH drive vehicles>

C-122 (L)

AC311048

<LH drive vehicles>

Sensor side

D-38 (B)

AB

Connector: D-38

<RH drive vehicles>

D-38 (B)

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-66

STEP 7. Check the harness between 4WD-ECU 
connector C-25 terminal No.23 and longitudinal 
G-sensor connector D-38 terminal No.2.

Check the output line for short or open circuit.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the wiring harness.

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>

AC311048

<LH drive vehicles>

Sensor side

D-38 (B)

AB

Connector: D-38

<RH drive vehicles>

D-38 (B)