Mitsubishi Galant. Manual — part 437

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-215

STEP 14. Check harness for short circuit to ground, open
circuit or damage between A/T control relay connector A-
19X terminal 3 and PCM connector C-41 terminals 77 and
89.
Q: Is the harness wire in good condition?

YES : Go to Step 15.
NO : Repair it.

STEP 15. Check harness for damage between A/T control
relay connector A-19X terminal 1 and battery.
Q: Is the harness wire in good condition?

YES : Go to Step 16.
NO : Repair it.

STEP 16. Check harness for damage between A/T control
relay connector A-19X terminal 2 and the ground.
Q: Is the harness wire in good condition?

YES : Go to Step 17.
NO : Repair it.

AC004286 AC

A/T CONTROL
RELAY

BATTERY

CONNECTOR: A-19X

AC004197

PCM

AC

CONNECTOR: C-41

AC004286 AC

A/T CONTROL
RELAY

BATTERY

CONNECTOR: A-19X

AC004286 AC

A/T CONTROL
RELAY

BATTERY

CONNECTOR: A-19X

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-216

STEP 17. Check harness 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 : Repair it because of harness short circuit to ground

between A/T control relay connector A-19X terminal 3
and solenoid valve assy connector B-38 terminal 9.

NO : Repair it.

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Vehicle does not Move

COMMENT
If the engine does not start when the selector lever is
in "P" or "N" position, the cause is probably a
malfunction of Park/Neutral position switch system,
transaxle control cable assembly, engine system,
torque converter or oil pump.

TROUBLESHOOTING HINTS (The most likely

causes for this case:)

Malfunction of the Park/Neutral position switch

Malfunction of the transaxle control cable
assembly

Malfunction of the engine system

Malfunction of the torque converter

Malfunction of the oil pump

Malfunction of the PCM

DIAGNOSIS

REQUIRED SPECIAL TOOL:
MB991502: Scan Tool (MUT-II)

AC004286 AC

A/T CONTROL
RELAY

BATTERY

CONNECTOR: A-19X

AC004197

PCM

AD

CONNECTOR: C-40

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

23A-217

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 "LOCK" (OFF) position.

Q: Is A/T diagnostic trouble code numbers "27" or "28"

displayed?
YES :
Refer to

P.23A-124

,

P.23A-143

, code number 27, 28:

Park/Neutral Position Switch System.

NO : Go to Step 2.

STEP 2. Check the transaxle control cable assembly.
Move the selector lever to each position, and check if the
manual control lever position of the Park/Neutral position
switch corresponds to the selector lever position.

Q: Is the manual control lever position correct?

YES : Go to Step 3.
NO : Repair the transaxle control cable. Refer to

P.23A-

278

, Park/Neutral Position Switch and Control Cable

Adjustment. Confirm that the malfunction symptom is
correct.

STEP 3. Check the engine.
Refer to GROUP 13A <2.4L Engine>, Diagnosis

Trouble

Symptom Chart

Starting

P.13A-22

or GROUP 13B <3.0L

Engine>, Diagnosis

Trouble Symptom Chart

Starting

P.13B-22

.

Q: Is the inspection result good?

YES : Go to Step 4.
NO : Repair or replace the appropriate engine

components.

AC003081AC

MB991502

DATA LINK
CONNECTOR

AC001856

P

R

N

D

3

2

L

PARK/NEUTRAL
POSITION SWITCH

MANUAL
CONTROL
LEVER

AB

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-218

STEP 4. Check the torque converter.
(1) Remove the transaxle.
(2) Check the torque converter for installation condition

(whether installed in a slanted direction or not), its spline or
its teeth for damage. Refer to GROUP 23B, Transaxle

P.23B-10

.

Q: Is the torque converter in good condition?

YES : Go to Step 5.
NO : Repair or replace it.

STEP 5. Replace the oil pump.
Replace the oil pump (Oil pump cannot be repaired). Refer to
GROUP 23B, Transaxle

P.23B-10

. Confirm that the

malfunction symptom is eliminated.

Q: Is the symptom eliminated?

YES : Diagnosis is complete.
NO : Go to Step 6.

STEP 6. Replace the PCM.

Q: Is the symptom eliminated?

YES : Diagnosis is complete.
NO : Start over at Step 1.

INSPECTION PROCEDURE 2: Does not

ove Forward

COMMENT
If the vehicle does not move forward when the
selector lever is shifted from "N" to "D", "2" or "L"
range while the engine is idling, the cause is
probably abnormal line pressure or a malfunction of
the underdrive clutch or valve body.

TROUBLESHOOTING HINTS (The most likely

causes for this case:)

Abnormal line pressure

Malfunction of the underdrive solenoid valve

Malfunction of the underdrive clutch

Malfunction of the valve body

Malfunction of the PCM

DIAGNOSIS

REQUIRED SPECIAL TOOL:
MB991502: Scan Tool (MUT-II)

AC001857

AC001858

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