Mitsubishi Montero (2002-2004). Manual - part 884

 

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Mitsubishi Montero (2002-2004). Manual - part 884

 

 

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-19

DIAGNOSIS

Required Special Tool:

• MB991502: Scan Tool (MUT-II)

STEP 1. 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 "LOCK" (OFF) position before connect-
ing 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 "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 :  Go to Step 2.

ACX01539AD

MB991502

16-PIN

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-20

STEP 2. Measure the sensor output voltage at the A/T 
control solenoid valve assembly connector C-03 by 
backprobing.
(1) Do not disconnect connector C-03.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 1 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 6.
NO :  Go to Step 3.

STEP 3. 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 4.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E, Harness Connector Inspection 

P.00E-

2

.

AC204395

CONNECTOR : C-03

AE

C-03 (B)

6

10

4

9

5

3

8

2

7

1

AC204918 AI

C-03 HARNESS CONNECTOR : 
HARNESS SIDE

6

9

5

10

8

3

7

2

1

4

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-21

STEP 4. Check the sensor output voltage at A/T control 
solenoid valve assembly connector C-03.
(1) Disconnect connector C-03 and measure at the harness 

side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 1 and ground.

• The voltage should measure between 4.5 and 4.9 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?

YES : Go to Step 5.
NO :  Go to Step 7.

AC204395

CONNECTOR : C-03

AE

C-03 (B)

6

10

4

9

5

3

8

2

7

1

AC204918 AJ

C-03 HARNESS CONNECTOR : 
COMPONENT SIDE

1

8

2

7

9

4

10

5

6

3

DIAGNOSTIC TROUBLE CODE PROCEDURES <AUTOMATIC TRANSMISSION>

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

23Ac-22

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

 

 

 

 

 

 

 

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