Mitsubishi Montero (2002-2004). Manual - part 934

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-219

STEP 3. Using an oscilloscope, check the input shaft 
speed sensor waveform at PCM connector D-134 by 
backprobing.
(1) Do not disconnect connector D-134.

(2) Connect an oscilloscope probe to PCM connector D-134 

terminal 64 and terminal 88 by backprobing.

(3) Start the engine and drive the vehicle at constant speed of 

50 km/h (31 mph). (Gear range: 3rd gear)

(4) Check the input shaft speed sensor waveform.

• The input shaft speed sensor waveform should show a 

pattern similar to the illustration. The maximum value 
should be 4.8 volts and more and the minimum value 
0.8 volt and less. The output waveform should not con-
tain electrical noise. 

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the waveform normal?

YES : Go to Step 8.
NO :  Go to Step 4.

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

AC204946 AE

OSCILLO-
SCOPE

PROBE

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

ACX02131AB

NORMAL WAVEFORM

(V)

5

0

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-220

STEP 4. Check input shaft speed sensor connector C-16, 
PCM connector D-134 and intermediate connector E-114 
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 5.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-

2

.

AC204747

CONNECTOR : C-16

C-16 (B)

AB

1

3

2

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

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87

86

85

76

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84

83

AC204176

CONNECTOR : E-114

BD

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

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-221

STEP 5. Check harness for damage between input shaft 
speed sensor connector C-16 terminal 2 and PCM 
connector D-134 terminal 64.
Q: Is the harness wire in good condition?

YES : Go to Step 6.
NO :  Repair or replace the harness wire.

STEP 6. Replace the input shaft speed sensor.
(1) Replace the input shaft speed sensor. Refer to GROUP 

23B, Transmission 

P.23B-18

.

(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Were any A/T DTCs set?

YES : Go to Step 7.
NO :  The procedure is complete.

AC204747

CONNECTOR : C-16

C-16 (B)

AB

1

3

2

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

ACX01225AE

INPUT SHAFT
SPEED SENSOR

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-222

STEP 7. Replace the reverse clutch retainer.
(1) Replace the reverse clutch retainer. Refer to GROUP 23B, 

Reverse and Overdrive Clutches 

P.23B-67

.

(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Were any A/T DTCs set?

YES : An A/T DTC may have set due to external radio 

frequency interference (RFI) possibly caused by 
cellular phone activity, or aftermarket components 
installed on the vehicle.

NO :  The procedure complete.

ACX02132AB