Mitsubishi Montero Sport (2004+). Manual — part 621

AUTOMATIC TRANSMISSION DIAGNOSIS

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AUTOMATIC TRANSMISSION

23A-49

STEP 6. Using scan tool MB991958, check data list item 15:
Transmission Fluid Temperature Sensor.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Start the engine.
(3) Set scan tool MB991958 to data reading mode.

• Item 15: Transmission Fluid Temperature Sensor.

• When the engine is cool: Almost equal to the ambi-

ent temperature (atmospheric temperature).
NOTE: Set scan tool MB991958 to data reading
mode for item number 13, Intake Air Temperature
(IAT) Sensor and note the temperature measure-
ment. When the engine is cool, the temperature
should be almost equal to the ambient temperature
(atmospheric temperature), and the IAT sensor mea-
surement should be approximately 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.00-7

.

NO : Replace the PCM.

STEP 7. Check A/T control solenoid valve assembly
connector B-02 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

.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

AC202314

6

10

4

9

5

3

8

2

7

1

CONNECTOR: B-02

TRANSMISSION
CONTROL CABLE

B-02 (B)

AB

AUTOMATIC TRANSMISSION DIAGNOSIS

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AUTOMATIC TRANSMISSION

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STEP 8. Measure the resistance of the ground circuit at A/T
control solenoid valve assembly connector B-02.

(1) Disconnect connector B-02 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 9.
NO : Go to Step 13.

AC202314

6

10

4

9

5

3

8

2

7

1

CONNECTOR: B-02

TRANSMISSION
CONTROL CABLE

B-02 (B)

AB

ACX02105AK

B-02 HARNESS CONNECTOR:
COMPONENT SIDE

AUTOMATIC TRANSMISSION DIAGNOSIS

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AUTOMATIC TRANSMISSION

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STEP 9. Measure the sensor output voltage at PCM
connector C-92 by backprobing.

(1) Do not disconnect connector C-92.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 124 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 between 4.5 and 4.9 volts?

YES : Go to Step 10.
NO : Go to Step 11.

AC202317

PCM

120

107

119

106

129 130

118

105

117

114115116

126127128

104

111

103

112

108

101102

109110

121122123

124

113

125

CONNECTOR: C-92

C-92 (GR)

AB

AC001792AJ

C-92 HARNESS CONNECTOR:
HARNESS SIDE

AUTOMATIC TRANSMISSION DIAGNOSIS

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AUTOMATIC TRANSMISSION

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STEP 10. Check the harness for open circuit or damage
between A/T control solenoid valve connector B-02
terminal 1 and PCM connector C-92 terminal 124.

Q: Is the harness wire in good condition?

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

AC202314

6

10

4

9

5

3

8

2

7

1

CONNECTOR: B-02

TRANSMISSION
CONTROL CABLE

B-02 (B)

AB

AC202317

PCM

120

107

119

106

129 130

118

105

117

114115116

126127128

104

111

103

112

108

101102

109110

121122123

124

113

125

CONNECTOR: C-92

C-92 (GR)

AB