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