Mitsubishi Montero (2002-2004). Manual - part 982

SYMPTOM PROCEDURES <AUTOMATIC TRANSMISSION>

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SYMPTOM PROCEDURES

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STEP 6. Check harness for short circuit to ground between 
dual pressure switch connector A-22 terminal 2 and A/C-
ECU connector D-23 terminal 5 <Vehicles with full 
automatic A/C> or dual pressure switch connector A-22 
terminal 2 and automatic compressor controller connector 
D-119 terminal 4 <Vehicles with manual A/C>.
Q: Is the harness wire in good condition?

YES : Go to Step 7.
NO :  Repair or replace the harness wire.

AC204167

CONNECTOR : A-22

AV

A-22 (BR)

A-22

1 2

AC204188

CONNECTORS : D-23, D-119

D-23 (B)

D-23, D-119

D-119 (B)

BD

20

10

19

9

17

7

16

6

14

4

3

13

5

15

11

1 2

12

8

18

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SYMPTOM PROCEDURES

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STEP 7. Using scan tool MB991502, check data list item 65: 
Dual Pressure Switch.

CAUTION

To prevent damage to scan tool MB991502, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to data reading mode for item65, 

Dual Pressure Switch.

• When the A/C is in operation, scan tool MB991502 dis-

play should be "ON."

• When the A/C is not in operation, scan tool MB991502 

display should be "OFF."

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the switch operating properly?

YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points 

− How to Cope with 

Intermittent Malfunction 

P.00-6

.

NO :  Check the air conditioning system. Refer to GROUP 

55, Troubleshooting Strategy 

P.55A-5

. 

STEP 8. Check intermediate connector D-28, A/C-ECU 
connector D-23 <Vehicles with full automatic A/C> and 
automatic compressor controller connector D-119 
<Vehicles with manual A/C> for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Are the connectors and terminals in good condition?

YES : Go to Step 9.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-

2

.

ACX01539AD

MB991502

16-PIN

AC204188

CONNECTORS : D-23, D-28, D-119

D-23 (B)

D-23, D-119

D-119 (B)

BE

D-28

D-28

20

10

19

9

17

7

16

6

14

4

3

13

5

15

11

1 2

12

8

18

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

SYMPTOM PROCEDURES <AUTOMATIC TRANSMISSION>

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SYMPTOM PROCEDURES

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STEP 9. Check the harness for open circuit between dual 
pressure switch connector A-22 terminal 2 and A/C-ECU 
connector D-23 terminal 5 <Vehicles with full automatic A/
C> or dual pressure switch connector A-22 terminal 2 and 
automatic compressor controller connector D-119 terminal 
4 <Vehicles with manual A/C>.
Q: Is the harness wire in good condition?

YES : Go to Step 14.
NO :  Repair or replace the harness wire.

AC204167

CONNECTOR : A-22

AV

A-22 (BR)

A-22

1 2

AC204188

CONNECTORS : D-23, D-119

D-23 (B)

D-23, D-119

D-119 (B)

BD

20

10

19

9

17

7

16

6

14

4

3

13

5

15

11

1 2

12

8

18

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SYMPTOM PROCEDURES

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STEP 10. Measure the switch output voltage at PCM 
connector D-134 by backprobing.
(1) Do not disconnect connector D-134.
(2) Start the engine and run at idle.
(3) Operate the A/C.

(4) Measure the voltage between terminal 69 and ground by 

backprobing.

• When the A/C is in operation, the voltage should mea-

sure battery positive voltage.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage battery positive voltage?

YES : Go to Step 15.
NO :  Go to Step 11.

AC204681AC

CONNECTOR: D-134

D-134 (GR)

61 62

63 64

65 66 67 68 69 70 71 72 73

82

89

81

88

80

79

78

77

87

86

85

76

75

74

84

83

AC204918 BI

D-134 HARNESS CONNECTOR : 
HARNESS SIDE

76

85

65

72

71

73

82

75

81

74

63 64

66

70

69

68

67

78

87

79

88 89

80

77

86

62

61

83 84