Mitsubishi Montero (2002-2004). Manual - part 87

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-41

STEP 17. Check powertrain control module connector D-
132 and A/C compressor relay connector A-12X for 
damage.
Q:  Are powertrain control module connector D-132 and A/

C compressor relay connector A-12X in good 
condition?
YES : Go to Step 18.
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

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

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-42

STEP 18. Check the wiring harness between powertrain 
control module connector D-132 (terminal 8) and A/C 
compressor relay connector A-12X (terminal 1).

NOTE: Also check intermediate connector A-03. If intermediate 
connector A-03 is damaged, repair or replace the connector as 
described in GROUP 00E, Harness Connector Inspection 

P.00E-2

.

Q: Is the wiring harness between powertrain control 

module connector D-132 (terminal 8) and A/C 
compressor relay connector A-12X (terminal 1) in good 
condition?
YES : Check that the air conditioning works normally.
NO :  Repair the wiring harness. Check that the air 

conditioning works normally.

AC204183

CONNECTOR : A-12X

AP

RELAY BOX
SIDE

2 1

5

4

3

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

AC204167

CONNECTOR : A-03

AT

A-03 (B)

6

12

5

3 4

2

1

9 10

8

7

11

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-43

STEP 19. Check the dual pressure switch operation.
(1) Remove the dual pressure switch connector and connect 

the high/low pressure side terminals located on the harness 
side as shown in the illustration.

(2) Install a gauge manifold to the high-pressure side service 

valve of the refrigerant line. (Refer to 

P.55A-152

.)

(3) When the high/low pressure sides of the dual pressure 

switch are at operation pressure (ON) and there is 
continuity between the respective terminals, then the 
condition is normal.

Q: Is the dual pressure switch operating properly?

YES : Go to Step 20.
NO :  Replace the dual pressure switch. Check that the air 

conditioning works normally.

STEP 20. Check dual pressure switch connector A-22 and 
A/C-ECU connector D-23 for damage.
Q: Are dual pressure switch connector A-22 and A/C-ECU 

connector D-23 in good condition?
YES : Go to Step 21.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Check 

that the air conditioning works normally.

ITEM

OFF to ON

ON to OFF

Low-pressure side kPa 
(psi)

223 

± 27 (32.1 

± 3.9)

196 

± 20 (28.4 

± 2.9)

High-pressure side kPa 
(psi)

2,550 

± 200 

(369.9 

± 29)

3,140 

± 200 

(455.5 

± 29)

ACX00822

kPa
(psi)

196 ± 20
(28.4 ± 2.9)

223 ± 27
(32.1 ± 3.9)

2,550 ± 200
(369.9 ± 29)

3,140 ± 200
(455.5 ± 29)

DUAL PRESSURE
SWITCH

AE

AC204167

CONNECTOR : A-22

AW

A-22(BR)

A-22(BR)

2 1

HARNESS SIDE

AC204170

CONNECTOR : D-23

D-23(B)

D-23(B)

CP

HARNESS 
SIDE

1

3

4

2

12

1413

11

6

7

8

10 9

18

19

20

16

17

5

15

AUTO A/C DIAGNOSIS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-44

STEP 21. Check the wiring harness between dual pressure 
switch connector A-22 (terminal 2) and A/C-ECU connector 
D-23 (terminal 5).
NOTE: Also check intermediate connector D-28. If intermediate 
connectors D-28 is damaged, repair or replace the connector 
as described in GROUP 00E, Harness Connector Inspection 

P.00E-2

.

Q:  Is the wiring harness between dual pressure switch 

connector A-22 (terminal 2) and A/C-ECU connector D-
23 (terminal 5) in good condition?
YES : Go to Step 22.
NO :  Repair the wiring harness. Check that the air 

conditioning works normally.

AC204167

CONNECTOR : A-22

AW

A-22(BR)

A-22(BR)

2 1

HARNESS SIDE

AC204188

CONNECTOR : D-23, D-28

D-23(B)

D-23(B)

CJ

HARNESS SIDE

1

3

4

2

12

1413

11

6

7

8

10 9

18

19

20

16

17

5

15

2 3

27

32

28

33

16

15

4 5

19

18

29

17

34

7 8

35

22

21

9 10

30

36

31

37

25

24

23

6

20

1

14

26

11

13

12

38

D-28

D-28

HARNESS SIDE