Mitsubishi Galant 9G. Manual — part 559

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-314

INSPECTION PROCEDURE 14: Vibration

.

COMMENT

If vibration occurs when driving at constant speed or
when accelerating in 4th gear, abnormal torque con-
verter clutch pressure a malfunction of the engine
system, torque converter clutch solenoid, torque con-
verter or valve body may exist.

.

TROUBLESHOOTING HINTS (The most
likely causes for this condition:)

• Abnormal torque converter clutch pressure

• Malfunction of the engine system

• Malfunction of the torque converter clutch sole-

noid

• Malfunction of the torque converter

• Malfunction of the valve body

• Malfunction of the PCM

DIAGNOSIS

Required Special Tool:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

STEP 1. Using scan tool MB991958, check actuator test
item 06: Torque Converter Clutch Solenoid Valve.

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) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the actuator test mode.

• Item 06: Torque Converter Clutch Solenoid Valve.

• An audible clicking or buzzing should be heard when

the torque converter clutch solenoid valve is ener-
gized.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the solenoid valve operating properly?

YES : Go to Step 2.
NO : Repair or replace the torque converter clutch solenoid

valve. Refer to GROUP 23B, Valve Body

P.23B-80

.

Then confirm that the symptom is eliminated.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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STEP 2. Check the vibration.
Q: Does the vibration occur when the transmission fluid

temperature sensor connector has been disconnected?
YES : Check the engine system. Refer to GROUP 13A

<2.4L Engibe>, Diagnosis

− Symptom Chart − Driving

P.13A-38

or refer to GROUP 13B <3.8L Engine>,

Diagnosis

− Symptom Chart − Driving

P.13B-38

. If the

inspection result is not good, diagnose, repair, and/or
replace the engine component(s).

NO : Go to Step 3.

STEP 3. Check the torque converter hydraulic pressure.
Measure the torque converter hydraulic pressure. Then check if
the torque converter hydraulic pressure is within the standard
value. Refer to

P.23A-29

, Hydraulic Pressure Test.

Q: Is the torque converter hydraulic pressure within the

standard value?
YES : Go to Step 4.
NO : Go to Step 5.

STEP 4. Replace the torque converter assembly.
(1) Remove the transaxle.
(2) Replace the torque converter assembly. Refer to GROUP

23B, Transaxle

P.23B-10

. Then check the symptom.

Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Go to Step 6.

STEP 5. Disassemble and clean the valve body.
Check the O-ring installation bolts for looseness and the valve
body for damage. Repair or replace the faulty parts. Refer to
GROUP 23B, Valve Body

P.23B-80

.

Replace the valve body assembly if the damages are thought
to be irreparable. Then check the symptom.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Go to Step 6.

STEP 6. Replace the PCM.
Q: Is the symptom eliminated?

YES : The procedure is complete.
NO : Start over at Step 1.

AC001857

AC001860 AB

VALVE
BODY
ASSEMBLY

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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INSPECTION PROCEDURE 15: Shift Switch Assembly System

TRANSMISSION
RANGE SWITCH

SHIFT
SWITCH
ASSEMBLY

SHIFT
SWITCH
(DOWN)

SHIFT
SWITCH
(UP)

SELECT
SWITCH

AUTO
MODE

SPORT
MODE

IGNITION
SWITCH (IG1)

JUNCTION
BLOCK

JOINT
CONNECTOR (1)

AC210057AC

Shift Switch Assembly System Circuit

POWERTRAIN
CONTROL
MODULE

AUTOMATIC TRANSAXLE DIAGNOSIS

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AUTOMATIC TRANSAXLE

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AC306223

A-13 (GR)

AB

CONNECTOR: A-13

1

4

7

8

2 3

5

13

14

17

15

12

16

11

10

9

6

AC306248AH

CONNECTOR: B-20

PCM

AIR
CLEANER

JAE

41

37

32

40

39

23

21 22

35

31

30

26

36

27

43

42

25

24

38

34

29

33

28

B-20

AC210068

CONNECTOR: B-110

B-110 (B)

AE

TRANSMISSION
RANGE SWITCH

1

7

2

8

3

5

9

4

10

6

AC305231

CONNECTOR: C-01

AS

33

22

11

28

17

16

15

14

13

12

25

2324

2627

3

1 2

4 5

21

20

19

18

29 30

32

31

7

6

8

10

9

AC306349AB

CONNECTOR: C-20

4

3

1

5 6

2