Mitsubishi Montero (2002-2004). Manual - part 881

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-7

STEP 5. Check the transmission fluid temperature sensor 
at A/T control solenoid valve assembly connector C-03.
(1) Disconnect connector C-03 and measure at the sensor 

side.

(2) Measure the resistance between terminal 1 and 2.

• When transmission fluid temperature is 0°C (32°F), 

resistance should be between 16.7 and 20.5 k

Ω.

• When transmission fluid temperature is 20°C (68°F), 

resistance should be between 7.3 and 8.9 k

Ω.

• When transmission fluid temperature is 40°C (104°F), 

resistance should be between 3.4 and 4.2 k

Ω.

• When transmission fluid temperature is 60°C (140°F), 

resistance should be between 1.9 and 2.2 k

Ω.

• When transmission fluid temperature is 80°C (176°F), 

resistance should be between 1.0 and 1.2 k

Ω.

• When transmission fluid temperature is 100°C (212°F), 

resistance should be between 0.57 and 0.69 k

Ω.

Q: Is the measured resistance within the specified range?

YES : Go to Step 6.
NO :  Replace the transmission fluid temperature sensor. 

Refer to GROUP 23B, Transmission 

P.23B-18

.

AC204395

CONNECTOR : C-03

AE

C-03 (B)

6

10

4

9

5

3

8

2

7

1

AC204918

C-03 HARNESS CONNECTOR : 
SOLENOID VALVE SIDE

CS

6

10

4

9

5

3

8

2

7

1

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-8

STEP 6. Using scan tool MB991502, check data list item 15: 
Transmission Fluid Temperature Sensor.

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.
(3) Set scan tool MB991502 to data reading mode for item 15, 

Transmission Fluid Temperature Sensor.

• When the engine is cool: Almost equal to the ambient 

temperature (atmospheric temperature)
NOTE: Set scan tool MB991502 to data reading mode 
for item number 13, Intake Air Temperature (IAT) Sensor 
and note the temperature measurement. When the 
engine is cool, the temperature should be almost equal 
to the ambient temperature (atmospheric temperature), 
and the IAT sensor measurement should be approxi-
mately the same as the transmission fluid temperature 
sensor.

• When the engine is warm: 70 to 80°C (158 to 176°F)

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

STEP 7. Check A/T control solenoid valve assembly 
connector C-03 for loose, corroded or damaged terminals, 
or terminals pushed back in the connector.
Q: Are the connector and terminals in good condition?

YES : Go to Step 8.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-

2

.

ACX01539AD

MB991502

16-PIN

AC204395

CONNECTOR : C-03

AE

C-03 (B)

6

10

4

9

5

3

8

2

7

1

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-9

STEP 8. Measure the resistance of the ground circuit at A/T 
control solenoid valve assembly connector C-03.
(1) Disconnect connector C-03 and measure at the harness 

side.

(2) Measure the resistance between terminal 2 and ground.

• The resistance should measure less than 2 ohms.

Q: Is the resistance less than 2 ohms?

YES : Go to Step 5.
NO :  Go to Step 14.

AC204395

CONNECTOR : C-03

AE

C-03 (B)

6

10

4

9

5

3

8

2

7

1

AC204918

C-03 HARNESS CONNECTOR : 
COMPONENT SIDE

CZ

1

8

2

7

9

4

10

5

6

3

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-10

STEP 9. Measure the sensor output voltage at PCM 
connector D-135 by backprobing.
(1) Do not disconnect connector D-135.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 119 and ground by 

backprobing.

• When transmission fluid temperature is 20°C (68°F), 

voltage should measure between 3.8 and 4.0 volts.

• When transmission fluid temperature is 40°C (104°F), 

voltage should measure between 3.2 and 3.4 volts.

• When transmission fluid temperature is 80°C (176°F), 

voltage should measure between 1.7 and 1.9 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage within the specified range?

YES : Go to Step 12.
NO :  Go to Step 10.

AC204681AB

CONNECTOR: D-135

D-135 (GR)

91 92

93

101

94 95

96 97 98 99 100

102103

104

105106

107108 109

110 111112

113114

115116 117

118 119120

AC204918 BR

D-135 HARNESS CONNECTOR : 
HARNESS SIDE

116

97

103

104

112

110 111

106

94 95

98

102

101

100

99

109

115

107

119 120

96

105

91

113

108

117

93

92

114

118