Mitsubishi Lancer Evolution IX. Manual - part 591

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-47

STEP 3. Connectors check: C-25 4WD-ECU 
connector, C-122, C-134, F-21 intermediate 
connector, F-26 pressure sensor connector <LH 
drive vehicles> or C-25 4WD-ECU connector, 
C-134, C-138, F-21 intermediate connector, F-26 
pressure sensor connector <RH drive vehicles>.

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 4.

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>

AC311015AC

Connector: C-122 <LH drive vehicles>

C-122

AC311015AG

Connector: C-134 <LH drive vehicles>

C-134 (B)

AC311016AD

Connector: C-134 <RH drive vehicles>

C-134 (GR)

AC311016AB

Connector: C-138 <RH drive vehicles>

C-138

AC311042

F-21 (B)

AB

Connector: F-21, F-26

F-26 (B)

Sensor side

F-21

F-26

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-48

STEP 4. Check the harness between 4WD-ECU 
connector C-25 terminal No.10 and pressure 
sensor connector F-26 terminal No.3.

Check the power supply line, output line, earth line 
for short or open circuit.

Q: Is the check result normal?

YES : 

Replace the 4WD-ECU.

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>

AC311042

AC

Connector: F-26

F-26 (B)

Sensor side

F-26

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-49

Code No.47 Pressure sensor system (abnormal power supply)

PRESSURE SENSOR SYSTEM CIRCUIT

Refer to 

P.22A-41

.

OPERATION

Refer to 

P.22A-41

.

DIAGNOSIS CODE SET CONDITIONS

Code No.47 is set when the pressure sensor power 
supply voltage is above 4.0V during pressure sensor 
power OFF or less than 4.0V during pressure sensor 
power ON.

PROBABLE CAUSES

• Malfunction of the pressure sensor

• Damaged harness wires and connectors

• Malfunction of the 4WD-ECU

DIAGNOSIS

STEP 1. M.U.T.-II/III data list
Item 19: Pressure sensor power supply (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 4WD-ECU 

connector C-26 terminal No.43 and earth.

OK: 5 V

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-50

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 19: Pressure sensor power supply (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>