Mitsubishi Galant. Manual — part 428

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-179

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 130 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

P.00E-2

.

AC004197

PCM

AF

CONNECTOR: C-42

AC001965

C-42 CONNECTOR
HARNESS SIDE VIEW

AE

ACX02479

CONNECTOR: B-38

AF

AC004197

PCM

AF

CONNECTOR: C-42

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-180

STEP 5. Check harness for damage between solenoid
valve assembly connector B-38 terminal 5 and PCM
connector C-42 terminal 130.
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

P.00E-2

.

ACX02479

CONNECTOR: B-38

AF

AC004197

PCM

AF

CONNECTOR: C-42

AC004286 AC

A/T CONTROL
RELAY

BATTERY

CONNECTOR: A-19X

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-181

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 04: Overdrive 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

04: Overdrive Solenoid Valve.

•

An operation sound should be heard from solenoid
valve when the overdrive 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

P.00-8

.

NO : Replace the PCM.

ACX02479

CONNECTOR: B-38

AF

AC004286 AC

A/T CONTROL
RELAY

BATTERY

CONNECTOR: A-19X

AC003081AC

MB991502

DATA LINK
CONNECTOR

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-182

STEP 9. Check connector B-38 at solenoid valve assembly
for damage.
Q: Is the connector in good condition?

YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

.

STEP 10. Check the overdrive solenoid valve at solenoid
valve assembly connector B-38.
(1) Disconnect connector B-38 and measure at the solenoid

valve side.

(2) Measure the resistance between terminal 5 and 9.

Standard value: 2.7

−−−−

3.4

Ω

Ω

Ω

Ω

Q: Is the resistance at the standard value?

YES : Go to Step 11.
NO : Replace the overdrive solenoid valve. Refer to

GROUP 23B, Valve Body

P.23B-68

.

ACX02479

CONNECTOR: B-38

AF

ACX02479

CONNECTOR: B-38

AF

AC001968

HARNESS
CONNECTOR: B-38

AE