Mitsubishi Montero (2002-2004). Manual - part 936

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-227

STEP 15. Overhaul the A/T.
(1) Replace the following parts.

• If DTC 41, 42, 43 or 44 are set individually or in a group, 

replace the underdrive clutch. Refer to GROUP 23B, 
Underdrive Clutch 

P.23B-76

.

• If DTC 43, 44 or 45 are set individually or in a group, 

replace the overdrive clutch. Refer to GROUP 23B, 
Reverse and Overdrive Clutch 

P.23B-67

.

• If DTC 44 or 45 are set individually or in a group, replace 

the direct clutch. Refer to GROUP 23B, Direct Clutch 

P.23B-91

.

• If DTC 46 is set individually or in a group, replace the 

reverse clutch. Refer to GROUP 23B, Reverse and 
Overdrive Clutch 

P.23B-67

.

• If DTC 41 or 46 are set individually or in a group, replace 

the low-reverse brake. Refer to GROUP 23B, Transmis-
sion 

P.23B-18

.

• If DTC 42 or 45 are set individually or in a group, replace 

the second brake. Refer to GROUP 23B, Transmission 

P.23B-18

.

• If DTC 41, 42, 43 or 46 are set individually or in a group, 

replace the reduction brake. Refer to GROUP 23B, 
Transmission 

P.23B-18

.

• If DTC 41 is set individually or in a group, replace the 

one-way clutch (OWC-L). Refer to GROUP 23B, Low 
Reverse Annulus Gear 

P.23B-72

.

• If DTC 41, 42 or 43 are set individually or in a group, 

replace the one-way clutch (OWC-D). Refer to GROUP 
23B, Output Shaft Support 

P.23B-94

.

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

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 is complete.

AC204883 AH

OVERDRIVE
CLUTCH

REDUCTION
BRAKE

REVERSE
CLUTCH

SECOND
BRAKE

LOW-REVERSE
BRAKE

UNDERDRIVE
CLUTCH

DIRECT
CLUTCH

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-228

DTC 52: Torque Converter Clutch System

.

DTC SET CONDITIONS
If the input shaft speed sensor signal is abnormal 
and the drive duty rate for the torque converter clutch 
solenoid valve is 100 percent for a period of more 
than 4 seconds, it is judged that there is a problem in 
the torque converter clutch system and DTC 52 is 
set.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are:)

• Malfunction of the torque converter clutch sole-

noid valve

• Malfunction of the input shaft speed sensor

• Malfunction of the reverse clutch retainer

• Malfunction of the valve body

• Damaged harness or connector

• Malfunction of the PCM

• Malfunction of the torque converter

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, read the A/T 
diagnostic trouble code.

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) Turn the ignition switch to the "ON" position.
(3) Check for A/T diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC 22 set?

YES : Refer to 

P.23Ac-47

, DTC 22: Input Shaft Speed 

Sensor System.

NO :  Go to Step 2.

STEP 2. Using scan tool MB991502, check actuator test 
item 06: Torque Converter Clutch Solenoid Valve.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to actuator test mode for item 06, 

Torque Converter Clutch Solenoid Valve.

• An audible clicking or buzzing should be heard when the 

torque converter clutch solenoid valve is energized.

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

YES : Go to Step 3.
NO :  Replace the torque converter clutch solenoid valve. 

Refer to GROUP 23B, Valve Body 

P.23B-80

.

ACX01539AD

MB991502

16-PIN

ACX01539AD

MB991502

16-PIN

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

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DIAGNOSTIC TROUBLE CODE PROCEDURES

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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 a constant speed of 

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

(4) Check the 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>

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DIAGNOSTIC TROUBLE CODE PROCEDURES

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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

77

87

86

85

76

75

74

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