Mitsubishi Galant. Manual — part 436

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-211

STEP 4. Check the power supply voltage at A/T control
relay connector A-19X.
(1) Disconnect the A/T control relay and measure at the

connector side.

(2) Turn the ignition switch to "ON" position.
(3) Measure the voltage between terminal 1 and ground.

•

Voltage should be battery positive voltage.

(4) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Go to Step 6.
NO : Go to Step 5.

STEP 5. Check connector C-04 at intermediate connector
for damage.
Q: Is the connector in good condition?

YES : Repair it because of harness open circuit or short

circuit to ground between A/T control relay connector
A-19X terminal 1 and battery.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

.

STEP 6. Check the continuity at A/T control relay
connector A-19X.
(1) Disconnect the A/T control relay and measure at the

connector side.

(2) Check for the continuity between terminal 2 and ground.

•

Should be less than 2 ohm.

Q: Is the continuity normal?

YES : Go to Step 7.
NO : Rapier it because of harness open circuit or damage

between A/T control relay connector A-19X terminal 2
and the earth.

ACX02168

HARNESS
CONNECTOR: A-19X

AC

AC004287AB

CONNECTOR: C-04

ACX02172

HARNESS
CONNECTOR: A-19X

AC

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-212

STEP 7. Check the power supply voltage at A/T control
relay connector A-19X.
(1) Disconnect the A/T control relay and measure at the

connector side.

(2) Turn the ignition switch to "ON" position.
(3) Measure the voltage between terminal 4 and ground.

•

Voltage should be battery positive voltage.

(4) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Go to Step 11.
NO : Go to Step 8.

STEP 8. Check the power supply voltage at PCM connector
C-40 by backprobing.
(1) Do not disconnect connector C-40.
(2) Turn the ignition switch to "ON" position.

(3) Measure the voltage between terminal 50 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 9.
NO : Go to Step 10.

STEP 9. Check connector C-40 at PCM for damage.
Q: Is the connector in good condition?

YES : Repair it because of harness open circuit between A/

T control relay connector A-19X terminal 4 and PCM
connector C-40 terminal 50.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

.

ACX02173

HARNESS
CONNECTOR: A-19X

AC

AC004197

PCM

AD

CONNECTOR: C-40

AC002010

C-40 CONNECTOR
HARNESS SIDE VIEW

AE

AC004197

PCM

AD

CONNECTOR: C-40

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-213

STEP 10. Check for short circuit to ground between A/T
control relay connector A-19X terminal 4 and PCM
connector C-40 terminal 50.
Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO : Repair it.

STEP 11. Using scan tool MB991502, check data list item
54: A/T control relay output Voltage.

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) Set scan tool MB991502 to data reading mode for item 54:

A/T Control Relay Output Voltage.

•

Voltage should be battery positive voltage.

(4) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the relay 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.

AC004286 AC

A/T CONTROL
RELAY

BATTERY

CONNECTOR: A-19X

AC004197

PCM

AD

CONNECTOR: C-40

AC003081AC

MB991502

DATA LINK
CONNECTOR

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-214

STEP 12. Check the relay output voltage at PCM connector
C-41 by backprobing.
(1) Do not disconnect connector C-41.
(2) Turn the ignition switch to "ON" position.

(3) Measure the voltage between terminal 77 and ground by

backprobing.

•

Voltage should be battery positive voltage.

(4) Measure the voltage between terminal 89 and ground by

backprobing.

•

Voltage should be battery positive voltage.

(5) Turn the ignition switch to "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Go to Step 11.
NO : Go to Step 13.

STEP 13. Check connector C-41 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 14.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

.

AC004197

PCM

AC

CONNECTOR: C-41

AC002011

C-41 CONNECTOR
HARNESS SIDE VIEW

AE

AC002012

C-41 CONNECTOR
HARNESS SIDE VIEW

AE

AC004197

PCM

AC

CONNECTOR: C-41