Mitsubishi Montero Sport (2004+). Manual — part 624
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-61
DIAGNOSIS
Required Special Tool:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
STEP 1. 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
.
NO : Go to Step 2.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-62
STEP 2. Measure the sensor output voltage at the A/T
control solenoid valve assembly connector B-02 by
backprobing.
(1) Do not disconnect connector B-02.
(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 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 4.
NO : Repair or replace the damaged components. Refer to
GROUP 00E, Harness Connector Inspection
AC202314
6
10
4
9
5
3
8
2
7
1
CONNECTOR: B-02
TRANSMISSION
CONTROL CABLE
B-02 (B)
AB
5
2
1
7
3
8
4
9
6
10
AC200996AF
B-02 HARNESS
CONNECTOR:
HARNESS SIDE
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
23A-63
STEP 4. Check the sensor output voltage at A/T control
solenoid valve assembly connector B-02.
(1) Disconnect connector B-02 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.
AC202314
6
10
4
9
5
3
8
2
7
1
CONNECTOR: B-02
TRANSMISSION
CONTROL CABLE
B-02 (B)
AB
ACX02104AI
B-02 HARNESS CONNECTOR:
COMPONENT SIDE
AUTOMATIC TRANSMISSION DIAGNOSIS
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AUTOMATIC TRANSMISSION
23A-64
STEP 5. Check the transmission fluid temperature sensor
at A/T control solenoid valve assembly connector B-02.
(1) Disconnect connector B-02 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
AC202314
6
10
4
9
5
3
8
2
7
1
CONNECTOR: B-02
TRANSMISSION
CONTROL CABLE
B-02 (B)
AB
ACX02103AJ
B-02 HARNESS
CONNECTOR:
A/T CONTROL SOLENOID
VALVE ASSEMBLY SIDE
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