Mitsubishi Montero (2004+). Manual — part 866
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-39
FAIL-SAFE (IN CASE OF FAIL-SAFE VALVE B OPERATION)
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2
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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
23A-40
FAIL-SAFE (IN CASE OF FAIL-SAFE VALVE C OPERATION)
1
2
3
4
5
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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
23A-41
LINE PRESSURE ADJUSTMENT
M1231108700109
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: 0.98
− 1.05 MPa (142 − 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
Readjust the line pressure if necessary.
DIAGNOSTIC TROUBLE CODE CHART
M1231101200125
AC100548
ADJUSTING
SCREW
AB
A/T DIA-
GNOSTIC
TROUBLE
CODE
MFI
DIAGNOS
TIC
TROUBLE
CODE
DIAGNOSTIC ITEM
REFERENCE PAGE
15
P0713
Transmission fluid temperature sensor
system
Open circuit
16
P0712
Short circuit
21
-
Crankshaft position sensor system
Open circuit
Group 13A,
Diagnostic
Trouble code
Procedures
(P0335
−
Crankshaft
Position Sensor
Circuit)
22
P0715
Input shaft speed sensor system
Short circuit/open circuit
23
P0720
Output shaft speed sensor system
Short circuit/open circuit
26
-
Stoplight switch system
Short circuit
27
P0705
Transmission range switch system
Open circuit
28
Short circuit
29
P0500
Vehicle speed sensor system
Short circuit/open circuit
31
P0753
Low-reverse solenoid valve system
Short circuit/open circuit
32
P0758
Underdrive solenoid valve system
Short circuit/open circuit
33
P0763
Second solenoid valve system
Short circuit/open circuit
34
P0768
Overdrive solenoid valve system
Short circuit/open circuit
35
P0773
Reduction solenoid valve system
Short circuit/open circuit
AUTOMATIC TRANSMISSION DIAGNOSIS
TSB Revision
AUTOMATIC TRANSMISSION
23A-42
NOTE: The MFI diagnostic trouble codes are the codes which are set when item "MFI" is selected on scan
tool MB991958 (MUT-III sub assembly). However, the codes above indicate failure in the automatic transmis-
sion.
SYMPTOM CHART <AUTOMATIC TRANSMISSION>
M1231108800106
36
P0743
Torque converter clutch solenoid system Short circuit/open circuit
41
P0731
1st gear incorrect ratio
42
P0732
2nd gear incorrect ratio
43
P0733
3rd gear incorrect ratio
44
P0734
4th gear incorrect ratio
45
P0735
5th gear incorrect ratio
46
P0736
Reverse gear incorrect ratio
52
P0741
Torque converter clutch solenoid system Defective system
53
P0742
Clutch stuck on
54
P1751
A/T Control relay system
Short circuit to
ground/open circuit
56
-
"N" range light system
Open circuit
A/T DIA-
GNOSTIC
TROUBLE
CODE
MFI
DIAGNOS
TIC
TROUBLE
CODE
DIAGNOSTIC ITEM
REFERENCE PAGE
SYMPTOM
INSPECTION
PROCEDURE
NO.
REFERENCE
PAGE
Communication with scan
tool MB991958 (MUT-III
sub assembly) is not
possible
Communication with all systems is
impossible
−
Group 13A,
Symptom
Procedures
Communication with the PCM only is
impossible
−
Group 13A,
Symptom
Procedures
Driving impossible
Engine does not crank
1
Does not move forward
2
Does not move backward
3
Does not move (forward or backward)
4
Malfunction when moving
selector into gear
Engine stalls when moving selector lever
from "N" to "D" or "N" to "R"
5
Shift shock when shifting from "N" to "D"
and long delay
6
Shift shock when shifting from "N" to "R"
and long delay
7
Shift shock when shifting from "N" to "D",
"N" to "R" and long delay
8
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