Mitsubishi Galant. Manual — part 426
AUTOMATIC TRANSAXLE DIAGNOSIS
TSB Revision
AUTOMATIC TRANSAXLE
23A-171
STEP 1. Using scan tool MB991502, read the A/T
diagnostic trouble code.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to "ON" position.
(3) Read the A/T diagnostic trouble code.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the A/T diagnostic trouble code number "54" output?
, code number 54: A/T control
relay system.
NO : Go to Step 2.
STEP 2. Using scan tool MB991502, check actuator test
item 03: Second Solenoid Valve.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to "ON" position.
(3) Set scan tool MB991502 to actuator test mode for item 03,
Second Solenoid Valve.
•
An operation sound should be heard from solenoid
valve when the second solenoid valve is operated.
(4) Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the solenoid valve operating properly?
YES : 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 3.
AC003081AC
MB991502
DATA LINK
CONNECTOR
AC003081AC
MB991502
DATA LINK
CONNECTOR
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-172
STEP 3. Check the solenoid valve output voltage at PCM
connector C-42 by backprobing.
(1) Do not disconnect connector C-42.
(2) Turn the ignition switch to "ON" position.
(3) Measure the voltage between terminal 106 and ground by
backprobing.
•
Voltage should be battery positive voltage.
(4) Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the voltage normal?
YES : Go to Step 4.
NO : Go to Step 9.
STEP 4. Check connectors B-38 at solenoid valve
assembly and C-42 at PCM for damage.
Q: Are the connectors in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
.
AC004197
PCM
AF
CONNECTOR: C-42
AC001963
C-42 CONNECTOR
HARNESS SIDE VIEW
AE
ACX02479
CONNECTOR: B-38
AF
AC004197
PCM
AF
CONNECTOR: C-42
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-173
STEP 5. Check harness for damage between solenoid
valve assembly connector B-38 terminal 4 and PCM
connector C-42 terminal 106.
Q: Is the harness wire in good condition?
YES : Go to Step 6.
NO : Repair it.
STEP 6. Check connector A-19X at A/T control relay for
damage.
Q: Is the connector in good condition?
YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
.
ACX02479
CONNECTOR: B-38
AF
AC004197
PCM
AF
CONNECTOR: C-42
AC004286 AC
A/T CONTROL
RELAY
BATTERY
CONNECTOR: A-19X
AUTOMATIC TRANSAXLE DIAGNOSIS
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AUTOMATIC TRANSAXLE
23A-174
STEP 7. Check harness for damage between solenoid
valve assembly connector B-38 terminal 9 and A/T control
relay connector A-19X terminal 3.
Q: Is the harness wire in good condition?
YES : Go to Step 8.
NO : Repair it.
STEP 8. Using scan tool MB991502, check actuator test
item 03: Second Solenoid Valve.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to data link connector.
(2) Turn the ignition switch to "ON" position.
(3) Set scan tool MB991502 to the actuator test mode for item
03: Second Solenoid Valve.
•
An operation sound should be heard from solenoid
valve when the second solenoid valve is operated.
(4) Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the solenoid valve operating properly?
YES : 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.
ACX02479
CONNECTOR: B-38
AF
AC004286 AC
A/T CONTROL
RELAY
BATTERY
CONNECTOR: A-19X
AC003081AC
MB991502
DATA LINK
CONNECTOR
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