Mitsubishi Montero (2002-2004). Manual - part 98

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-85

INSPECTION PROCEDURE 7: Inside/Outside Air Changeover is not Possible.

Outside/Inside Air changeover Damper Motor Citcuit

AC204170

CONNECTORS : D-01, D-23

DS

D-23(B)

D-01

AC204171 AY

D-20

CONNECTOR : D-10

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-86

DIAGNOSIS

Required Special Tools:

• MB991223: Test Harness Set

• MB991502: Scan Tool

STEP 1. Using scan tool MB991502, check actuator test 
item 13 and item 14: Outside/inside air selection damper 
control motor.
Carry out the actuator test.
Item 13 and 14: outside/inside air selection damper control 
motor 
Q: Does the check result show outside air (actuator test 

item number: 13) or inside air (actuator test number: 
14)?
YES :  Got to Step 8.
NO :   Go to Step 2.

AC204173

CONNECTORS : D-208, D-210

BF

D-208

D-210

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-87

STEP 2. Check the outside/inside air selection damper 
control motor.

CAUTION

Disconnect the battery negative terminal when the damper 
is in the inside/outside air position.
Check the outside/inside air selection damper control motor by 
the following procedures.

Q: Is the check result normal?

YES :  Got to Step 3.
NO :   Replace the inside air/outside air changeover 

damper motor. Check that the outside/inside air 
selection damper control motor works normally.

LEVER POSITION BATTERY 

CONNECTION

LEVER 
OPERATION

At the inside air 
position

• Connect 

terminal 1 to the 
positive battery 
terminal

• Connect 

terminal 2 to the 
negative battery 
terminal

The lever moves 
from the inside air 
position to the 
outside air position

At the outside air 
position

• Connect 

terminal 1 to the 
positive battery 
terminal

• Connect 

terminal 3 to the 
negative battery 
terminal

The lever moves 
from the outside air 
position to the 
inside air position

2 3

1

AC001041AB

OUTSIDE 
AIR

INSIDE AIR

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-88

STEP 3. Measure the voltage at outside/inside air selection 
damper control motor connector D-10.
(1) Disconnect outside/inside air selection damper control 

motor connector D-10, and measure the voltage at the 
harness side.

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

(3) Measure the voltage between terminal 1 and ground.

• The measured value should be approximately 12 volts 

(battery positive voltage).

Q: Does the measured voltage correspond with this range?

YES :  Go to Step 6.
NO :   Go to Step 4.

STEP 4. Check outside/inside air selection damper control 
motor connector D-10 for damage.
Q: Is outside/inside air selection damper control motor 

connector D-10 in good condition?
YES : Go to Step 5.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Check 

that the outside/inside air changeover damper control 
motor works normally.

AC204171

CONNECTOR : D-10

AO

HARNESS SIDE

1

3 2

AC204738 CZ

HARNESS SIDE : D-10

1

3 2

AC204171

CONNECTOR : D-10

AO

HARNESS SIDE

1

3 2