Mitsubishi Lancer Evolution IX. Manual - part 582

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-11

DIAGNOSIS

STEP 1. Check the battery.
Refer to GROUP 54A, Battery 

− On-vehicle Service 

− Battery Test 

P.54A-5

.

Q: Is the battery damaged?

YES : 

Charge or replace the battery.

NO : 

Go to Step 2.

STEP 2. M.U.T.-II/III data list
Item 10: Battery voltage (Refer to Data List Refer-
ence 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.

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.13 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 4.

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-12

STEP 4. Connectors check: C-25 4WD-ECU 
connector, C-124 intermediate connector, C-210 
J/B connector <LH drive vehicles> or C-25 
4WD-ECU connector, C-138 intermediate 
connector, C-214 J/B connector <RH drive 
vehicles>.

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the defective connector.

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>

AC311015AB

Connector: C-124 <LH drive vehicles>

C-124

AC310448

AS

Connector: C-210 <LH drive vehicles>

Junction block (front view)

Junction block side

C-210

AC311016AB

Connector: C-138 <RH drive vehicles>

C-138

AC310458

AO

Connector: C-214 
<RH drive vehicles>

Junction block (front view)

Junction 
block side

C-214

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-13

STEP 5. Check the harness between 4WD-ECU 
connector C-25 terminal No.13 and J/B connector 
C-210 terminal No.8 <LH drive vehicles> or J/B 
connector C-214 terminal No.16 <RH drive 
vehicles>.

Check the power supply line for short or open circuit.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the wiring harness.

STEP 6. M.U.T.-II/III data list
Item 10: Battery voltage (Refer to Data List Refer-
ence 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 7. Connector check: C-25 4WD-ECU 
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-25 (Y)

AB

Connector: C-25

4WD-ECU

C-25 (Y)

Rear console 
assembly

<LH drive vehicles>

<RH drive vehicles>

AC310448

AS

Connector: C-210 <LH drive vehicles>

Junction block (front view)

Junction block side

C-210

AC310458

AO

Connector: C-214 
<RH drive vehicles>

Junction block (front view)

Junction 
block side

C-214

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-14

Code No.13 Fail-safe relay system (inside 4WD-ECU)

OPERATION

The power supplied from the ignition switch will be 
distributed to each section inside the ECU through 
the fail-safe relay (incorporated in the ECU).

DIAGNOSIS CODE SET CONDITIONS

Code No.13 will be set as the open circuit or short 
circuit of the fail-safe relay when the voltage is above 
6 V during fail-safe relay OFF or when the voltage is 
below 6 V during ON.

PROBABLE CAUSES

• Malfunction of the 4WD-ECU

DIAGNOSIS

Replace the 4WD-ECU.

Q: Is the malfunction eliminated?

YES : 

The inspection is complete.

NO : 

If no malfunction is not found an intermittent 
malfunction is suspected. (Refer to GROUP 
00 

− How to Cope with Intermittent 

Malfunction 

P.00-5

).

Code No.21, 22, 23, 24 Wheel speed sensor system

OPERATION

• The ABS-ECU detects the speed of each wheel 

according to the pulse signals from each wheel 
speed sensor.

• The 4WD-ECU receives the wheel speed sensor 

signals through the ABS-ECU.

DIAGNOSIS CODE SET CONDITIONS

A diagnosis code corresponding to the open circuit or 
short circuit of the wheel speed sensor is set when 
one wheel speed sensor has detected a vehicle 
speed of above 15 km/h, but any one of the remain-
ing three wheel speed sensors could not detect the 
vehicle speed.

4WD-ECU

ABS-ECU

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

ABS-ECU signal line system circuit