Mitsubishi Lancer Evolution IX. Manual - part 553

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-85

STEP 11. Check the wiring harness between 
C-121 engine-ECU connector terminal No.20 and 
B-13X A/C compressor relay connector terminal 
No.3.

• Check the A/C compressor relay earth line for 

open or short circuit.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00, How to 
Cope with Intermittent Malfunction 

P.00-5

).

NO : 

Repair the wiring harness.

AC504760AB

Connector: B-13X

Front of 
vehicle

1

3

2

4

Relay box side

AC504617AB

Connector: C-121 <LHD>

C-121 (GR)

Harness side

AC504618AB

Connector: C-121 <RHD>

Harness side

C-121 (GR)

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-86

Inspection Procedure 11: Condenser Fan does not Operate.

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple

IGNITION
SWITCH (IG2)

BATTERY

RELAY
BOX

CONDENSER
FAN RELAY (HI)

CONDENSER
FAN MOTOR

ENGINE-ECU

CONDENSER
FAN RELAY (LO)

Condenser Fan Motor Circuit

NOTE

: LH drive vehicles
: RH drive vehicles

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-87

CIRCUIT OPERATION

If the condenser fan motor does not operate, the 
condenser fan relay circuit system or the earth sys-
tem of the condenser fan motor is suspected.

PROBABLE CAUSES

• Malfunction of the condenser fan relay (HI)

• Malfunction of the condenser fan relay (LO)

• Malfunction of the condenser fan motor

• Malfunction of the engine-ECU

• Damaged the wiring harness or connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-34 condenser fan 
motor connector and C-121 engine-ECU 
connector

Q:  Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the connector.

AC310431

Harness side

Connector: A-34 <LHD>

AG

A-34 (B)

AC310433

Harness side

Connector: A-34 <RHD>

AF

A-34 (B)

AC504617AB

Connector: C-121 <LHD>

C-121 (GR)

Harness side

AC504618AB

Connector: C-121 <RHD>

Harness side

C-121 (GR)

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-88

STEP 2. Voltage measurement at A-34 condenser 
fan motor connector.

(1) Remove the relay, and measure at the relay box 

side.

(2) Turn the ignition switch to the "ON" position.

(3) Disconnect engine-ECU connector C-121, and 

earth terminal 30.

(4) Measure the voltage between terminal 1 and 

body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

 Go to Step 11.

NO  : 

 Go to Step 3.

AC310431

Harness side

Connector: A-34 <LHD>

AG

A-34 (B)

AC310433

Harness side

Connector: A-34 <RHD>

AF

A-34 (B)

AC504617AB

Connector: C-121 <LHD>

C-121 (GR)

Harness side

AC504618AB

Connector: C-121 <RHD>

Harness side

C-121 (GR)

AC504964

AC504964

Connector: C-121
(Harness side)

AB

AC310507

Connector: A-34 
(Harness side)

AI