Mitsubishi Galant (2004+). Manual — part 625
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-51
STEP 4. Check the sensor output voltage at A/T control
solenoid valve assembly connector B-108.
(1) Disconnect connector B-108 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 9.
AC306322
CONNECTOR: B-108
B-108 (GR)
AC
TRANSMISSION
RANGE SWITCH
2
7
1
8
3
9
4
6
10
5
2
5
6
10
4
9
3
8
1
7
AC201006AE
B-108 HARNESS
CONNECTOR:
COMPONENT SIDE
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-52
STEP 5. Check the transmission fluid temperature sensor
at A/T control solenoid valve assembly connector B-108.
(1) Disconnect connector B-108 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, Transaxle
AC306322
CONNECTOR: B-108
B-108 (GR)
AC
TRANSMISSION
RANGE SWITCH
2
7
1
8
3
9
4
6
10
5
2
7
1
8
3
9
4
6
10
5
AC209994AB
B-108 HARNESS
CONNECTOR:
TRANSMISSION FLUID
TEMPERATURE SENSOR SIDE
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-53
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 the 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 − 80°C (158 − 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 : Replace the PCM.
STEP 7. Check A/T control solenoid valve assembly
connector B-108 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
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC306322
CONNECTOR: B-108
B-108 (GR)
AC
TRANSMISSION
RANGE SWITCH
2
7
1
8
3
9
4
6
10
5
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-54
STEP 8. Measure the resistance of the ground circuit at A/T
control solenoid valve assembly connector B-108.
(1) Disconnect connector B-108 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 12.
AC306322
CONNECTOR: B-108
B-108 (GR)
AC
TRANSMISSION
RANGE SWITCH
2
7
1
8
3
9
4
6
10
5
2
5
6
10
4
9
3
8
1
7
AC209995
B-108 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
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