Mitsubishi Montero (2002-2004). Manual — part 872

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION DIAGNOSIS

23Ab-

29

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

1

2

3

4

5

6

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8

8

8

8

8

9

10

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13

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30

31

32

33

34

35

36

RP

N

D

: 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. REDUCTION BRAKE
7. DIRECT CLUTCH

8. ACCUMULATOR

9. CHECK

BALL

10. TORQUE CONVERTER CLUTCH

11. FAIL SAFE VALVE A

12. FAIL SAFE VALVE B
13. FAIL SAFE VALVE C

14. TORQUE CONVERTER CLUTCH CONTROL

VALVE

15. SWITCH VALVE

16. TRANSMISSION FLUID COOLER

17. LUBRICATION

18. LOW-REVERSE PRESSURE CONTROL VALVE

19. SECOND PRESSURE CONTROL VALVE

20. UNDERDRIVE PRESSURE CONTROL VALVE

21. OVERDRIVE PRESSURE CONTROL VALVE
22. REDUCTION PRESSURE CONTROL VALVE

23. TORQUE CONVERTER CLUTCH SOLENOID

VALVE

24. LOW-REVERSE SOLENOID VALVE

25. SECOND SOLENOID VALVE

26. UNDERDRIVE SOLENOID VALVE

27. OVERDRIVE SOLENOID VALVE
28. REDUCTION SOLENOID VALVE

29. TORQUE CONVERTER CLUTCH PRESSURE

CONTROL VALVE

30. REGULATOR VALVE

31. MANUAL VALVE

32. OIL FILTER

33. OIL PUMP

34. OIL STRAINER

35. RELIEF VALVE

36. OIL PAN

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION DIAGNOSIS

23Ab-

30

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

1

2

3

4

5

6

7

8

8

8

8

8

8

9

10

11

12

13

14

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21

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23

24

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26

27

28

29

30

31

32

33

34

35

36

RP

N

D

: 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. REDUCTION BRAKE
7. DIRECT CLUTCH

8. ACCUMULATOR

9. CHECK

BALL

10. TORQUE CONVERTER CLUTCH

11. FAIL SAFE VALVE A

12. FAIL SAFE VALVE B
13. FAIL SAFE VALVE C

14. TORQUE CONVERTER CLUTCH CONTROL

VALVE

15. SWITCH VALVE

16. TRANSMISSION FLUID COOLER

17. LUBRICATION

18. LOW-REVERSE PRESSURE CONTROL VALVE

19. SECOND PRESSURE CONTROL VALVE

20. UNDERDRIVE PRESSURE CONTROL VALVE

21. OVERDRIVE PRESSURE CONTROL VALVE
22. REDUCTION PRESSURE CONTROL VALVE

23. TORQUE CONVERTER CLUTCH SOLENOID

VALVE

24. LOW-REVERSE SOLENOID VALVE

25. SECOND SOLENOID VALVE

26. UNDERDRIVE SOLENOID VALVE

27. OVERDRIVE SOLENOID VALVE
28. REDUCTION SOLENOID VALVE

29. TORQUE CONVERTER CLUTCH PRESSURE

CONTROL VALVE

30. REGULATOR VALVE

31. MANUAL VALVE

32. OIL FILTER

33. OIL PUMP

34. OIL STRAINER

35. RELIEF VALVE

36. OIL PAN

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION DIAGNOSIS

23Ab-31

LINE PRESSURE ADJUSTMENT

M1231108700091

1. Drain the transmission fluid.

NOTE: The hydraulic pressure test must be performed
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 counterclockwise.
NOTE: Adjust to the middle of the standard range when the
transmission is at the 1st or 2nd gear.

Standard value: 1.01

− 1.05 MPa (147 − 152 psi)

NOTE: Each complete turn of the adjusting screw changes
pressure: 0.035 MPa (5.1 psi)

4. Install the valve body cover. Pour in one quart Transmission

fluid.

5. Repeat the hydraulic pressure test. (Refer to

P.23Ab-15

.)

Readjust the line pressure if necessary.

DIAGNOSTIC TROUBLE CODE CHART

M1231101200114

AC100548

ADJUSTING
SCREW

AB

A/T
DTC

MFI
DTC

DIAGNOSTIC ITEM

REFERENCE
PAGE

15

P0712

Transmission fluid temperature sensor
system

Open circuit

P.23Ac-2

16

P0713

Short circuit

P.23Ac-18

21

-

Crankshaft position sensor system

Open circuit

P.23Ac-27

22

P0715

Input shaft speed sensor system

Short circuit/open circuit

P.23Ac-47

23

P0720

Output shaft speed sensor system

Short circuit/open circuit

P.23Ac-65

26

-

Stoplight switch system

Short circuit

P.23Ac-83

27

P0705

Transmission range switch system

Open circuit

P.23Ac-93

28

Short circuit

P.23Ac-123

29

P0500

Vehicle speed sensor system

Short circuit/open circuit

P.23Ac-140

31

P0753

Low-reverse solenoid valve system

Short circuit/open circuit

P.23Ac-147

32

P0758

Underdrive solenoid valve system

Short circuit/open circuit

P.23Ac-160

33

P0763

Second solenoid valve system

Short circuit/open circuit

P.23Ac-171

34

P0768

Overdrive solenoid valve system

Short circuit/open circuit

P.23Ac-181

35

P0773

Reduction solenoid valve system

Short circuit/open circuit

P.23Ac-193

36

P0743

Torque converter clutch solenoid system

Short circuit/open circuit

P.23Ac-204

41

P0731

1st gear incorrect ratio

P.23Ac-215

42

P0732

2nd gear incorrect ratio

P.23Ac-215

43

P0733

3rd gear incorrect ratio

P.23Ac-215

44

P0734

4th gear incorrect ratio

P.23Ac-215

45

P0735

5th gear incorrect ratio

P.23Ac-215

46

P0736

Reverse gear incorrect ratio

P.23Ac-215

AUTOMATIC TRANSMISSION DIAGNOSIS

TSB Revision

AUTOMATIC TRANSMISSION DIAGNOSIS

23Ab-32

NOTE: The MFI diagnostic trouble codes are the codes which are set when item "MFI" is selected on scan
tool MB991502. However, the codes above indicate failure in the automatic transmission.

SYMPTOM CHART <AUTOMATIC TRANSMISSION>

M1231108800098

52

P0741

Torque converter clutch solenoid system

Defective system

P.23Ac-228

53

P0742

Clutch stuck on

P.23Ac-232

54

P1751

A/T Control relay system

Short circuit to ground/
open circuit

P.23Ac-237

56

-

"N" range light system

Open circuit

P.23Ac-253

A/T
DTC

MFI
DTC

DIAGNOSTIC ITEM

REFERENCE
PAGE

SYMPTOM

INSPECTION
PROCEDURE
NO.

REFERENCE PAGE

Communication with
scan tool (MUT-II) is
not possible

Communication with all systems is
impossible

−

Group 13A,
Symptom
Procedures

P.13Ad-

2

Communication with the PCM only is
impossible

−

Group 13A,
Symptom
Procedures

P.13Ad-

5

Driving impossible

Engine does not crank

1

P.23Ad-2

Does not move forward

2

P.23Ad-4

Does not move backward

3

P.23Ad-6

Does not move (forward or backward)

4

P.23Ad-8

Malfunction when
moving selector into
gear

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

5

P.23Ad-9

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

6

P.23Ad-11

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

7

P.23Ad-14

Shift shock when shifting from "N" to "D",
"N" to "R" and long delay

8

P.23Ad-17

Malfunction when
shifting

Shift shocks and slipping

9

P.23Ad-18

Does not shift
properly

Early or late shifting in all gears

10

P.23Ad-21

Early or late shifting in some gears

11

P.23Ad-23

Does not shift

No diagnostic trouble codes

12

P.23Ad-25

Malfunction while
driving

Poor acceleration

13

P.23Ad-29

Vibration

14

P.23Ad-30

Vehicle shifts differently with A/C engaged

15

P.23Ad-33

Transmission won't downshift under load with auto-cruise engaged 16

P.23Ad-45