Mitsubishi Montero (2002-2004). Manual - part 984

SYMPTOM PROCEDURES <AUTOMATIC TRANSMISSION>

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SYMPTOM PROCEDURES

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STEP 3. Using scan tool MB991502, check data list item 66: 
Overdrive Off Signal.

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 prepare to test drive the vehicle. 

(Operate the auto-cruise)

(3) Set scan tool MB991502 to data reading mode for item 66, 

Overdrive Off Signal.

• When driving at level road, the display should be "OFF."

• When driving at uphill road, the display should be "ON."

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the PCM 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 :  Replace the PCM.

ACX01539AD

MB991502

16-PIN

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INSPECTION PROCEDURE 17: Shift Switch Assembly System

AC205256AB

Shift Switch Assembly System Circuit

SYMPTOM PROCEDURES <AUTOMATIC TRANSMISSION>

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SYMPTOM PROCEDURES

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AC204395

CONNECTOR : C-04

AF

C-04 (B)

4
9

5

10

3
8

2
7

6

1

AC204188

CONNECTORS : D-01, D-32

D-01

D-32 (GR)

D-32

CQ

D-01

9 10

8

6 7

31 32

30

29

18 19 20 21

5

4

2

1

3

27

26

24

23

25

12 13 14 15 16 17

28

11
22
33

10

9

23

22

12

11

25

24

8

6 7

20

13

5

4

18

17

19

21

16

3

2

15

14

1

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

AC204191

CONNECTORS : D-208, D-212

5 6

2

4

3

1

JUNCTION BLOCK
(FRONT VIEW)

3

10

9

4

11

8

7

1

5

2

6

D-208

D-208

D-212

D-212

AS

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.

CIRCUIT OPERATION
If the select switch of the shift switch assembly is set 
to the sport mode, battery positive voltage will be 
applied to the PCM (terminal 85). If the shift switch of 
the shift switch assembly is set to "UP" or "DOWN" 
position, battery positive voltage will be applied to the 
PCM (terminals 68 or 77).

.

COMMENT
The cause is probably a malfunction of the transmis-
sion range switch circuit, shift switch assembly circuit 
or a defective PCM.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this case:)

• Malfunction of the transmission range switch

• Malfunction of the shift switch assembly select 

switch

• Malfunction of the shift switch assembly shift 

switch (Up)

• Malfunction of the shift switch assembly shift 

switch (Down)

• Damaged harness, connector

• Malfunction of the PCM

AC204194

CONNECTORS : E-11, E-113, E-114, E-115

E-113

E-113

E-11

E-11

AX

E-115

E-115

E-114

E-114

3

10

16

9

7 8

6

1

4

2

5

11

14

1213

15

1

6

2

7 8 9 10 11 12 13 14

3 4 5

38

28

16

33

22

10

31

19

7

1

18

30

29

17

5

6

21

20

32

8

2

9

25

13

3

24

23

3435

1112

27

26

3637

14

4

15

8

3

4 5

1

2

6 7