Mitsubishi Galant. Manual — part 392

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-35

FAIL-SAFE (IN CASE OF FAIL-SAFE VALVE A OPERATION)

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R N

P

D
3
2
L

: LINE PRESSURE

: OIL PUMP SUCTION PRESSURE

: TORQUE CONVERTER CLUTCH
PRESSURE

: TORQUE CONVERTER AND LUBRICATION
PRESSURE

: TORQUE CONVERTER CLUTCH SOLENOID
VALVE PRESSURE

1. REVERSE CLUTCH
2. LOW-REVERSE BRAKE
3. SECOND BRAKE
4. UNDERDRIVE CLUTCH
5. OVERDRIVE CLUTCH
6. ACCUMULATOR
7. CHECK BALL
8. TORQUE CONVERTER CLUTCH
9. FAIL SAFE VALVE A
10. FAIL SAFE VALVE B
11. TORQUE CONVERTER CLUTCH CONTROL

VALVE

12. SWITCH VALVE
13. A/T FLUID COOLER
14. LUBRICATION
15. LOW-REVERSE PRESSURE CONTROL VALVE
16. SECOND PRESSURE CONTROL VALVE

17. UNDERDRIVE PRESSURE CONTROL VALVE
18. OVERDRIVE PRESSURE CONTROL VALVE
19. TORQUE CONVERTER CLUTCH SOLENOID

VALVE

20. LOW-REVERSE SOLENOID VALVE
21. SECOND SOLENOID VALVE
22. UNDERDRIVE SOLENOID VALVE
23. OVERDRIVE SOLENOID VALVE
24. TORQUE CONVERTER PRESSURE

CONTROL VALV E

25. REGULATOR VALVE
26. MANUAL VALVE
27. OIL FILTER
28. OIL PUMP
29. OIL STRAINER
30. RELIEF VALVE
31. OIL PAN

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-36

FAIL-SAFE (IN CASE OF FAIL-SAFE VALVE B OPERATION)

: LINE PRESSURE

: OIL PUMP SUCTION PRESSURE

: TORQUE CONVERTER CLUTCH
PRESSURE

: TORQUE CONVERTER AND LUBRICATION
PRESSURE

: TORQUE CONVERTER CLUTCH SOLENOID
VALVE PRESSURE

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2

3

4

5

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R N

P

D
3
2
L

1. REVERSE CLUTCH
2. LOW-REVERSE BRAKE
3. SECOND BRAKE
4. UNDERDRIVE CLUTCH
5. OVERDRIVE CLUTCH
6. ACCUMULATOR
7. CHECK BALL
8. TORQUE CONVERTER CLUTCH
9. FAIL SAFE VALVE A
10. FAIL SAFE VALVE B
11. TORQUE CONVERTER CLUTCH CONTROL

VALVE

12. SWITCH VALVE
13. A/T FLUID COOLER
14. LUBRICATION
15. LOW-REVERSE PRESSURE CONTROL VALVE
16. SECOND PRESSURE CONTROL VALVE

17. UNDERDRIVE PRESSURE CONTROL VALVE
18. OVERDRIVE PRESSURE CONTROL VALVE
19. TORQUE CONVERTER CLUTCH SOLENOID

VALVE

20. LOW-REVERSE SOLENOID VALVE
21. SECOND SOLENOID VALVE
22. UNDERDRIVE SOLENOID VALVE
23. OVERDRIVE SOLENOID VALVE
24. TORQUE CONVERTER PRESSURE

CONTROL VALV E

25. REGULATOR VALVE
26. MANUAL VALVE
27. OIL FILTER
28. OIL PUMP
29. OIL STRAINER
30. RELIEF VALVE
31. OIL PAN

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-37

LINE PRESSURE ADJUSTMENT

M1231001700059

1. Drain the A/T fluid.

NOTE: Be sure to perform the hydraulic pressure test before
attempting any adjustments.

2. Remove the valve body cover.

3. Turn the adjusting screw shown in the illustration to adjust

the line pressure to the standard value. The pressure
increases when the screw is turned to the left.

NOTE: When adjusting the line pressure, adjust to the
middle of the standard value range.

Standard value: 1,010

−−−−

1,050 kPa (147

−−−−

152 psi)

4. Install the valve body cover. Pour in one quart A/T fluid.

5. Repeat the hydraulic pressure test. (Refer to

P.23A-23

.)

Readjust the line pressure if necessary.

DIAGNOSTIC TROUBLE CODE CHART

M1231007900040

AC001830

ADJUSTING
SCREW

AB

CODE

DIAGNOSIS ITEM

REFERENCE
PAGE

11

Throttle position sensor system

Short circuit

P.23A-39

12

Open circuit

P.23A-48

14

Sensor out of adjustment

P.23A-56

15

A/T fluid temperature sensor system

Open circuit

P.23A-66

16

Short circuit

P.23A-73

21

Crankshaft position sensor system

Open circuit

P.23A-78

22

Input shaft speed sensor system

Short circuit/open circuit

P.23A-94

23

Output shaft speed sensor system

Short circuit/open circuit

P.23A-105

26

Stoplight switch system

Short circuit

P.23A-117

27

Park/Neutral position switch system

Open circuit

P.23A-124

28

Short circuit

P.23A-143

29

Vehicle speed sensor system

Short circuit/open circuit

P.23A-150

31

Low-reverse solenoid valve system

Short circuit/open circuit

P.23A-156

32

Underdrive solenoid valve system

Short circuit/open circuit

P.23A-164

33

Second solenoid valve system

Short circuit/open circuit

P.23A-170

34

Overdrive solenoid valve system

Short circuit/open circuit

P.23A-177

36

Torque converter clutch solenoid system

Short circuit/open circuit

P.23A-184

41

1st gear incorrect ratio

P.23A-192

42

2nd gear incorrect ratio

P.23A-192

43

3rd gear incorrect ratio

P.23A-192

44

4th gear incorrect ratio

P.23A-192

46

Reverse gear incorrect ratio

P.23A-192

AUTOMATIC TRANSAXLE DIAGNOSIS

TSB Revision

AUTOMATIC TRANSAXLE

23A-38

SYMPTOM CHART

M1231008000051

52

Torque converter clutch solenoid system

Defective system

P.23A-201

53

Lock-up stuck on

P.23A-206

54

A/T Control relay system

Short circuit to ground/open
circuit

P.23A-208

CODE

DIAGNOSIS ITEM

REFERENCE
PAGE

SYMPTOMS

INSPECTION
PROCEDURE NO.

REFERENCE
PAGE

Communication with
scan tool is not pos-
sible

Communication with
all systems is impos-
sible

2.4L Engine

-

Group 13A,
diagnosis

P.13A-

312

3.0L Engine

-

Group 13B,
diagnosis

P.13B-

389

Communication with
the PCM only is im-
possible

2.4L Engine

-

Group 13A,
diagnosis

P.13A-

314

3.0L Engine

-

Group 13B,
diagnosis

P.13B-

391

Driving impossible

Vehicle does not move

1

P.23A-216

Does not move forward

2

P.23A-218

Does not move backward

3

P.23A-220

Does not move (forward or backward)

4

P.23A-223

Malfunction when en-
gaging

Engine stalls when moving selector lever
from "N" to "D" or "N" to "R"

5

P.23A-224

Shift shocks when shifting from "N" to "D"
and long delay

6

P.23A-225

Shift shocks when shifting from "N" to "R"
and long delay

7

P.23A-228

Shift shocks when shifting from "N" to "D"
or "N" to "R" and long delay

8

P.23A-231

Malfunction when
shifting

Shift shocks and slipping

9

P.23A-233

Does not shift prop-
erly

Early or late shifting in all gears

10

P.23A-234

Early or late shifting in some gears

11

P.23A-237

Does not shift

No diagnostic trouble codes

12

P.23A-239

Malfunction while
driving

Poor acceleration

13

P.23A-242

Vibration

14

P.23A-244

Vehicle shifts differently with A/C engaged

15

P.23A-247

Transaxle won't downshift under load with auto-cruise engaged

16

P.23A-255