Mitsubishi Lancer Evolution IX. Manual - part 592

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-51

STEP 5. Connectors check: C-26 4WD-ECU 
connector, C-122, C-134, F-21 intermediate 
connector, F-26 pressure sensor connector.

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

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>

AC311015AC

Connector: C-122 <LH drive vehicles>

C-122

AC311016AE

Connector: C-122 <RH drive vehicles>

C-122 (L)

AC311015AG

Connector: C-134 <LH drive vehicles>

C-134 (B)

AC311016AD

Connector: C-134 <RH drive vehicles>

C-134 (GR)

AC311042

F-21 (B)

AB

Connector: F-21, F-26

F-26 (B)

Sensor side

F-21

F-26

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-52

STEP 6. Check the harness between 4WD-ECU 
connector C-26 terminal No.43 and pressure 
sensor connector F-26 terminal No.1.

Check the power supply line for short or open circuit.

Q: Is the check result normal?

YES : 

Replace the pressure sensor.

NO : 

Repair the wiring harness.

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>

AC311042

AC

Connector: F-26

F-26 (B)

Sensor side

F-26

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-53

Code No.51 Longitudinal G-sensor system (open circuit or short circuit)

IGNITION
SWITCH (IG2)

ABS-ECU

4WD-ECU

G-SENSOR
(LONGITUDINAL)

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

G-sensor (longitudinal) system circuit <LH drive vehicles>

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-54

OPERATION

The 4WD-ECU receives the acceleration level in the 
forward/reverse direction of the vehicle from the lon-
gitudinal G-sensor.

DIAGNOSIS CODE SET CONDITIONS

Code No.51 is set when the output signal of the lon-
gitudinal G-sensor is less than 0.5 V or above 4.5 V.

PROBABLE CAUSES

• Malfunction of the longitudinal G-sensor

• 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 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 : 

Go to Step 2.

IGNITION
SWITCH (IG2)

ABS-ECU

4WD-ECU

G-SENSOR
(LONGITUDINAL)

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

G-sensor (longitudinal) system circuit <RH drive vehicles>