Mitsubishi Montero (2002-2004). Manual - part 85

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-33

STEP 7. Check the magnetic clutch operation.
Connect the battery (+) terminal to the air conditioning com-
pressor clutch connector terminal 3, and ground the battery (-) 
terminal to the body of the compressor. The condition is normal 
if the sound of the magnetic clutch (click) can be heard.
Q: Can the sound of the magnetic clutch (click) be heard?

YES : Check that the air conditioning works normally. 
NO :  Replace the compressor magnet clutch. Check that 

the air conditioning works normally. 

ACX01440AB

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-34

STEP 8. Measure the voltage at A/C compressor connector 
B-30. 
(1) Disconnect A/C compressor connector B-30 and measure 

the voltage at the harness side.

(2) Disconnect powertrain control module connector D-132.

(3) Ground powertrain control module connector D-132 

(terminal 8).

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

(5) Measure the voltage between terminal 3 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 19.
NO :   Go to Step 9.

AC204169

CONNECTOR : B-30

AE

B-30(B)

B-30(B)

2

3

1

HARNESS 
SIDE

AC204171

CONNECTOR : D-132

D-132(GR)

D-132(GR)

AS

HARNESS SIDE

8

23

1110

24

9

6

22

7

16

17

15

3

4

1312

19

20
2726

2

1
5

14
21

25

18

AC205176

8

23

1110

24

9

6

22

7

16

17

15

3

4

13 12

19

20
27 26

2

1
5

14

21

25

18

HARNESS SIDE : D-132

AB

AC204738 CY

HARNESS SIDE : B-30

2

3

1

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-35

STEP 9. Measure the voltage at A/C compressor relay 
connector A-12X.
(1) Disconnect A/C compressor connector A-12X and measure 

the voltage at the relay box side.

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

(3) Measure the voltage between terminal 3 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 12.
NO :   Go to Step 10.

STEP 10. Check A/C compressor relay connector A-12X for 
damage.
Q:  Is A/C compressor relay connector A-12X in good 

condition?
YES : Go to Step 11.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Check 

that the air conditioning works normally.

AC204183

CONNECTOR : A-12X

AP

RELAY BOX
SIDE

2 1

5

4

3

AC204738 CV

RELAY BOX SIDE : A-12X

2 1

5

4

3

AC204183

CONNECTOR : A-12X

AP

RELAY BOX
SIDE

2 1

5

4

3

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-36

STEP 11. Check the wiring harness between A/C 
compressor relay connector A-12X (terminal 3) and the 
ignition switch (IG2).

AC204183

CONNECTOR : A-12X

AP

RELAY BOX
SIDE

2 1

5

4

3