Mitsubishi Lancer Evolution IX. Manual - part 588

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-35

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-36

STEP 6. Check the harness between 4WD-ECU 
connector C-26 (terminal No.33, 34) and steering 
wheel sensor connector C-230 (terminal No.5, 4).

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-37

Code No.41, 42 Throttle position sensor system

OPERATION

The 4WD-ECU receives a change in the output volt-
age from the throttle position sensor to determine the 
accelerator pedal opening angle.

DIAGNOSIS CODE SET CONDITIONS

• Code No.41 is set as excessively small output 

when the TPS output is below 0.2 V In the idling 
state.

• Code No.42 is set as excessively large output 

when the TPS output is more than 4.8 V for more 
than 2 minutes continuously below a vehicle 
speed of 10 km/h.

PROBABLE CAUSES

• Malfunction of the throttle position sensor

• Damaged harness wires and connectors

• Malfunction of the 4WD-ECU

DIAGNOSIS

STEP 1. M.U.T.-II/III diagnosis code

Q: Is MPI diagnosis code P0120 set?

YES : 

Refer to GROUP 13A 

− Inspection Chart for 

Diagnosis Codes 

P.13A-60

.

NO : 

Go to Step 2.

STEP 2. M.U.T.-II/III data list
Item 13: Throttle position 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 3.

4WD-ECU

THROTTLE
POSITION
SENSOR

<LH DRIVE VEHICLES> OR
<RH DRIVE VEHICLES>

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

Throttle position sensor system circuit

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-38

STEP 3. 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.39 and earth.

OK:

Accelerator pedal fully released: 0.535 

− 

0.735 V

Accelerator pedal fully depressed: 4.5 

− 5.0 

V

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 6.

STEP 4. Connector check: C-26 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 13: Throttle position 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.

STEP 6. Check throttle position sensor.
Check throttle position sensor (Refer to 

P.13A-404

).

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair or replace throttle position sensor.

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>