Mitsubishi Lancer Evolution IX. Manual - part 587

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-31

STEP 5. Connectors check: C-26 4WD-ECU 
connector, C-122 intermediate connector, C-230 
steering wheel sensor connector <LH drive 
vehicles> or C-26 4WD-ECU connector, C-138 
intermediate connector, C-230 steering wheel 
sensor connector <RH drive vehicles>.

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

AC311016AB

Connector: C-138 <RH drive vehicles>

C-138

AC311035

<LH drive vehicles>

Harness side

C-230

AB

Connector: C-230

<RH drive vehicles>

C-230

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-32

STEP 6. Check the harness between 4WD-ECU 
connector C-26 terminal No.44 and steering 
wheel sensor connector C-230 terminal No.1.

Check the output line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

STEP 7. Replace the steering wheel sensor and 
then recheck the diagnosis code.
(1) Replace the steering wheel sensor.
(2) Test drive the vehicle.
(3) Check the diagnosis code.

Q: Is the diagnosis code set?

YES : 

Go to Step 4.

NO : 

The inspection is complete.

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>

AC311035

<LH drive vehicles>

Harness side

C-230

AB

Connector: C-230

<RH drive vehicles>

C-230

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-33

Code No.34 Steering wheel sensor system <ST-1, ST-2>

STEERING WHEEL SENSOR SYSTEM 
CIRCUIT

Refer to 

P.22A-20

.

OPERATION

Refer to 

P.22A-20

.

DIAGNOSIS CODE SET CONDITIONS

Code No.34 is set when no change in the steering 
wheel sensor signal at a vehicle speed of above 15 
km/h is detected for a total of more than 15 minutes 
<ST-1, ST-2>, and turning is detected during this 
time.

PROBABLE CAUSES

• Malfunction of the steering wheel sensor

• Damaged harness wires and connectors

• Malfunction of the 4WD-ECU

DIAGNOSIS

STEP 1. M.U.T.-II/III data list

• Item 53: Steering wheel sensor <ST-1>

• Item 54: Steering wheel sensor <ST-2>

Check the above data list (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.

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 the following 

terminals of 4WD-ECU connector C-26 and earth 
while turning the steering wheel.

• Terminal No.33 <ST-1>

• Terminal No.34 <ST-2>

OK: Approximately 1.5 

⇔ 3.5 V flushing

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Go to Step 5.

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-34

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 53: Steering wheel sensor <ST-1>

• Item 54: Steering wheel sensor <ST-2>

Check the above data list (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-26 (Y)

AC

Connector: C-26

4WD-ECU

C-26 (Y)

Rear console 
assembly

<LH drive vehicles>

<RH drive vehicles>