Mitsubishi Lancer Evolution IX. Manual - part 598

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-75

STEP 13. Connectors check: B-118 ABS-ECU 
connector, C-25 4WD-ECU connector, C-122 
intermediate connector, D-37 lateral G-sensor 
connector.

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 14.

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-37 (B)

AC

Connector: D-37

<RH drive vehicles>

D-37 (B)

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-76

STEP 14. Check the harness between 4WD-ECU 
connector C-25 terminal No.11 and lateral 
G-sensor connector D-37 terminal No.2.

Check the output line for short or open circuit.

Q: Is the check result normal?

YES : 

Go to Step 15.

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-37 (B)

AC

Connector: D-37

<RH drive vehicles>

D-37 (B)

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-77

STEP 15. Check the harness between ABS-ECU 
connector B-118 terminal No.14 and lateral 
G-sensor connector D-37 terminal No.2.

Check the output line for short circuit.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the wiring harness.

Code No.57 Lateral G-sensor system (abnormal sensor)

G-SENSOR (LATERAL) SYSTEM CIRCUIT

Refer to 

P.22A-53

.

OPERATION

Refer to 

P.22A-53

.

DIAGNOSIS CODE SET CONDITIONS

Code No.57 is set when the G-sensor has exceeded 
the specified value in a state where the ABS and 
brake are not operating above the vehicle speed of 
10 km/h.

PROBABLE CAUSES

• Malfunction of the lateral 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 15: Lateral 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.

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>

Sensor side

D-37 (B)

AC

Connector: D-37

<RH drive vehicles>

D-37 (B)

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-78

STEP 2. Measure the voltage at lateral G-sensor 
connector D-37.

(1) Disconnect the lateral 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.11 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.

AC311048

<LH drive vehicles>

Sensor side

D-37 (B)

AC

Connector: D-37

<RH drive vehicles>

D-37 (B)

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>