Mitsubishi L200. Manual - part 879

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-45

Inspection Procedure 4: The inside/outside air changeover is impossible

Outside/Inside Air Selection Damper Control Motor Circuit

IGNITION 
SWITCH (IG2)

OUTSIDE/INSIDE 
AIR SELECTION 
DAMPER CONTROL MOTOR

A/C-ECU

MOTOR DRIVE
CIRCUIT

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

COMMENTS ON TROUBLE SYMPTOM
When inside air cannot be changed to outside air 
vice versa even if its changeover switch is on, the 
outside/inside air selection damper control motor 
system may be defective.

POSSIBLE CAUSES

• Malfunction of the outside/inside air selection 

damper control motor

• Damaged the wiring harness or connectors

• Malfunction of the automatic A/C control panel (A/

C-ECU)

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-46

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-40 outside/inside air 
selection damper control motor connector

AC509613

Connector: C-40 <LHD>

BK

Harness side

AC509930BH

Connector: C-40 <RHD>

Harness side

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the connector.

STEP 2. Voltage measurement at C-40 outside/
inside air selection damper control motor 
connector.

AC509613

Connector: C-40 <LHD>

BK

Harness side

AC509930BH

Connector: C-40 <RHD>

Harness side

(1) Disconnect the connector, and measure at the 

wiring harness side.

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

AC310507JN

Connector C-40 
(Harness side)

(3) Measure the voltage between terminal 1 and 

body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 3.

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-47

STEP 3. Check the wiring harness between C-40 
outside/inside air selection damper control motor 
connector terminal No.1 and the ignition switch 
(IG2). 

AC509613

Connector: C-40 <LHD>

BK

Harness side

AC509930BH

Connector: C-40 <RHD>

Harness side

NOTE: 

AC509934 AS

Connectors: C-207, C-209 <LHD>

Harness side

C-209

C-207

Harness side

C-209

C-207

Junction block (Front view)

AC509936 AN

Connectors: C-207, C-209 <RHD>

Harness side

C-209

C-207

Harness side

C-209

C-207

Junction block (Front view)

Prior to the wiring harness inspection, check junction 
block connectors C-209 and C-207, and repair if nec-
essary.

• Check the motor power supply line for open cir-

cuit.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

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

NO : 

Repair the wiring harness.

STEP 4. Check the outside/inside air selection 
damper control motor
Refer to 

P.55B-99

.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Replace the outside/inside air selection 
damper control motor.

STEP 5. Connector check: C-43 A/C-ECU 
connector

AC509611AR

Connector: C-43 <LHD>

Harness side

AC509932AS

Harness side

Connector: C-43 <RHD>

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the connector.

TROUBLESHOOTING

AUTOMATIC AIR CONDITIONER

55B-48

STEP 6. Check the wiring harness between C-43 
A/C-ECU connector (terminals 3 and 4) and C-40 
outside/inside air selection damper control motor 
connector (terminals 3 and 4).

AC509611AR

Connector: C-43 <LHD>

Harness side

AC509932AS

Harness side

Connector: C-43 <RHD>

AC509613

Connector: C-40 <LHD>

BK

Harness side

AC509930BH

Connector: C-40 <RHD>

Harness side

• Check the motor activating lines for open or short 

circuit.

Q: Is the check result normal?

YES : 

Replace the automatic A/C control panel (A/

C-ECU).

NO : 

Repair the wiring harness.