Mitsubishi Montero Sport (2004+). Manual - part 705

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-385

STEP 12. Check harness for open circuit or short circuit to 
ground between dual pressure switch connector A-23 
terminal 2 and PCM connector C-91 terminal 83.

Q: Is the harness wire in good condition?

YES : Go to Step 13.
NO :  Repair or replace the harness wire.

STEP 13. Check the dual pressure switch.

Refer to GROUP 55A, Dual Pressure Switch Check 

P.55-27

.

Q: Is the switch operating properly?

YES : Go to Step 14.
NO :  Replace the dual pressure switch. Refer to GROUP 

55A, Refrigerant Line 

P.55-56

.

AC202889

1 2

AB

CONNECTOR: A-23

A-23 (BR)

AC202435

PCM

59
68

58
67

46 47

57

56

53
64

54

65

55

66

50

62

51

63

49

48
60 61

52

44

41 42 43

45

AC202435

PCM

CONNECTOR: C-91

AB

C-91 (GR)

71 72 73 74

75 76

77

78 79 80 81 82 83 84 85 86 87 88

90 91

92 93 94

95 96

97

98

89

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-386

STEP 14. Measure the A/C refrigerant temperature switch 
terminal.

Check that there is continuity between the refrigerant tempera-
ture switch terminals.
Q: Is the resistance 2 ohms?

YES : Go to Step 15.
NO :  Replace the compressor assembly.

STEP 15. Using scan tool MB991958, check data list item 
65: Dual Pressure Switch.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991958 to data reading mode.

• Item65: Dual Pressure Switch.

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

MB991958 display should be "ON."

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

MB991958 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.00-7

.

NO :  Replace the PCM.

AC004993AB

REFRIGERANT 
TEMPERATURE 
SWITCH TERMINALS

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-387

STEP 16. Check connector C-91 at PCM 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 15.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-2

.

AC202435

PCM

59
68

58
67

46 47

57

56

53
64

54

65

55

66

50

62

51

63

49

48
60 61

52

44

41 42 43

45

AC202435

PCM

CONNECTOR: C-91

AB

C-91 (GR)

71 72 73 74

75 76

77

78 79 80 81 82 83 84 85 86 87 88

90 91

92 93 94

95 96

97

98

89

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION

23A-388

INSPECTION PROCEDURE 16: Transmission won’t Downshift under Load with Auto-cruise Engaged.

AC004941 AB

Auto-cruise Signal Line System Circuit

AC004478

CONNECTOR: C-35

AC

15

14

5 6 7

12

11

4

2 3

13

9

1

10

16

8

C-35 (B)

AC202442

22

2021

10

9

8

1718

6 7

19

1415

4 5

1112

1 2 3

13

16

CONNECTOR: C-41

C-41

AB