Mitsubishi Montero (2002-2004). Manual - part 937

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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: Is DTC 52 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

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STEP 7. Replace the reverse clutch retainer.
(1) Replace the reverse clutch retainer. Replace the reverse 

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

P.23B-67

.

(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Is DTC 52 set?

YES : The 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.

STEP 8. Replace the PCM.
(1) Replace the PCM.
(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Is DTC 52 set?

YES : Go to Step 9.
NO :  The procedure is complete.

STEP 9. Replace the valve body.
(1) Replace the valve body. Refer to GROUP 23B, 

Transmission 

P.23B-18

.

(2) Test drive the vehicle.
(3) Check for A/T diagnostic trouble code.
Q: Is DTC 52 set?

YES : Replace the torque converter. Refer to 

P.23Aa-37

, 

Transmission and Transfer Assembly.

NO :  The procedure is complete.

DTC 53: Torque Converter Clutch is Stuck On

.

DTC SET CONDITIONS
If the torque converter clutch remains engaged for a 
continuous period of ten seconds or more when the 
PCM is attempting to disengage the torque converter 
clutch, DTC 53 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 valve body

• Damaged harness, connector

• Malfunction of the PCM

ACX02132AB

ACX02161AD

VALVE BODY ASSEMBLY

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DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. Using scan tool MB991502, check data list item 52: 
Amount of Torque Converter Clutch Slippage.

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 constant speed of 60 km/h (37 

mph). (Gear range: 3rd gear)

(3) Set scan tool MB991502 to data reading mode for item 52, 

Amount of Torque Converter Clutch Slippage.

• Driving at constant speed of 60 km/h (37 mph), the dis-

play should be "

−10 to 10 r/min."

• If the accelerator pedal is released, the display on the 

scan tool changes. (50 km/h (31 mph) and less).

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the torque converter clutch slippage within the 

specified range?
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 :  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 5.
NO :  Go to Step 3.

ACX01539AD

MB991502

16-PIN

ACX01539AD

MB991502

16-PIN

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STEP 3. Check the harness for a short circuit to ground 
between A/T control solenoid valve assembly connector C-
03 and PCM connector D-136.
(1) Disconnect A/T control solenoid valve assembly connector 

C-03 and PCM connector D-136.

(2) Check for continuity between the A/T control solenoid valve 

assembly connector C-03 terminal 7 and ground.

(3) The measurement should indicate an open circuit.
Q: Does continuity exist?

YES : Go to Step 4.
NO :  Repair the harness short to ground.

AC204395

CONNECTOR : C-03

AE

C-03 (B)

6

10

4

9

5

3

8

2

7

1

AC204681AD

CONNECTOR: D-136

D-136 (GR)

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123

124

125 126 127 128 129 130

131 132

133

134 135

136 137 138

139 140

141

142 143

144

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146