2000 MITSUBISHI MONTERO Service Repair Manual

AUTOMATIC TRANSMISSION -Troubleshooting 23-44
Code No. 52 Damper clutch control systemProbable cause
If the DCC solenoid valve drive duty ratio is100% for a continuous period of 4
seconds or more when the damper clutch starts operating, it isjudged that there
is a problem with the damper clutch control system, and code No. 52 is output.DMalfunction of input shaft speed sensor
DMalfunction of DCC solenoid valve
DMalfunction of harness or connector
DMalfunction of reverse clutch retainer
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
DMalfunction of torque converter
LRefer to the Transmission Workshop Manual.
MUT-
IISelf-Diag Code
Is code No. 22 output?YESCode No. 22 Input shaft speed
sensor system check (Refer to
P.23-20.)
NO
NG
Check the trouble symptoms.
NG
Check the trouble symptoms.
NG
Eliminate the cause of the noise. OK
Replace the DCC solenoid valve.
L NGMUT-
IIActuator Test
DNo. 6 DCC solenoid valve
OK:Sound of operation can be
heard
Replace the input shaft speed
sensor.
L
NG
Repair
OK
Measure the output wave pattern of
the output shaft speed sensor at
engine-A/T-ECU connectors D-121
and D-122 <6G7>, or at A/T-ECU
connector D-108<4M4>(using an
oscilloscope).
DVehicle speed: approx. 50 km/h
DShift range: 4th
<6G7> Voltage between terminal
81 of D-121 and terminal 103 of
D-122
<4M4> Voltage between terminal
31 of D-108 and terminal 43 of
D-108
OK:A wave pattern such as the
one shown on P.23-69
(Check Procedure Using an
Oscilloscope) should be
output, and the maximum
value should be 4.8 V or
more and the minimumval-
ue should be 0.8 V or less.
There should be no noise
in the output wave pattern.
Overhaul the A/T.
L
DReplace the reverse clutch
retainer.
NG
Replace the valve body assembly.
L
Check the trouble symptoms.
Replace the engine-A/T-ECU or
A/T-ECU.
Replace the torque converter. NG
Check the trouble symptoms.OK
DCheck the harness between the
input shaft speed sensor and the
engine-A/T-ECU. <6G7>
DCheck the harness between the
input shaft speed sensor and the
A/T-ECU.<4M4>
NG


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AUTOMATIC TRANSMISSION -Troubleshooting 23-45
Code No. 54 A/T control relay systemProbable cause
If the A/T control relay voltage is less than 7 V after the ignition switch is turned
to the ON position, it is judged that there is ashort-circuit to earth oropen
circuit in the A/T control relay, and code No. 54 is output.
The transmission will be fixed in 3rd as a fail-safe measure, and the N range
indicator will flash at a rate of 1 Hz.DMalfunction of A/T control relay
DMalfunction of harness or connector
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
A/T control relay check
(Refer to P.23-103.)Replace
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Transient Malfunctions.)
OK NG
Check the following connectors:
<6G7> D-120,<4M4>D-109 OK OKNG
Repair OK Repair
Check the following connector: drive vehicles> A-04, vehicles> D-145 NG
(1)NG
(2)NG
NG
Measure at engine-A/T-ECU
connector D-120 <6G7>, or at
A/T-ECU connector D-109 <4M4>.
DMeasure at the ECU terminals.
D<6G7> Voltage between terminal
50 and earth
D<4M4> Voltage between terminal
71 and earth
OK:System voltage
Replace the engine-A/T-ECU or
A/T-ECU.NGCheck the trouble symptoms.
OKMUT-
IIService Data
DNo. 54 A/T control relay
OK:System voltage
(3)NG
OK
Measure at A/T control relay
connector D-12.
DDisconnect the relay and
measure at the connector side.
(1) Voltage between terminal 1 and
earth
OK:System voltage
(2) Resistance between terminal 2
and earth
OK:2
Wor less
(3) Voltage between terminal 4 and
earth
(Ignition switch: ON)
OK:System voltage
OK
Check the following connector:D-12Replace NG
Check the harness between the A/T
control relay and the battery.
NG
OKRepair
Check the following connector:D-14
Check the harness between the A/T
control relay and body earth.
Repair OKNG
NG
DCheck the harness between the
A/T control relay and the
engine-A/T-ECU. <6G7>
DCheck the harness between the
A/T control relay and the
A/T-ECU, and repair if necessary.
<4M4>
DCheck the harness between the
A/T control relay and the
engine-A/T-ECU. <6G7>
DCheck the harness between the
A/T control relay and the
A/T-ECU.<4M4>Measure at engine-A/T-ECU
connector D-121 <6G7>, or at
A/T-ECU connector D-107 <4M4>.
DMeasure at the ECU terminals.
DIgnition switch: ON
D<6G7> Voltage between terminals
77, 89 and earth
D<4M4> Voltage between terminals
2, 3 and earth
OK:System voltage
OK
DCheck the harness between the
A/T control relay and the battery.
DCheck the harness between the
A/T control relay and the
engine-A/T-ECU. <6G7>
DCheck the harness between the
A/T control relay and the
A/T-ECU, and repair if necessary.
<4M4> NGCheck the following connectors:
<6G7> D-121,<4M4>D-107OK
NG
Repair


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AUTOMATIC TRANSMISSION -Troubleshooting 23-46
Code No. 56 N range lamp systemProbable cause
If the N range signal is OFF after the N range lamp illuminates(ON), it is
judged that there is ashort-circuit to earth in the N range lamp, and code No.
56 is output.DMalfunction of Combination meter
DMalfunction of harness or connector
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
OK OK
NG
OK
NG
RepairCheck the following connectors:
<6G7> D-122, E-11,<4M4> E-11,
E-113, D-109
Check the harness between the
combination meter and earth, and
repair if necessary.
OK
OK
Measure at combination meter
connector D-01.
DDisconnect the connector and
measure at the harness side.
DResistance between terminal 57
and earth
OK:2
Wor lessNGNG
RepairCheck the following connector:D-30
OK
Measure at combination meter
connector D-03.
DDisconnect the connector and
measure at the harness side.
DResistance between terminal 3
and earth
OK:No continuity
NG
Repair
OK
NG
Replace the engine-A/T-ECU or
A/T-ECU.
Check the trouble symptoms.
OK
Check the following connectors:
<6G7> D-30, D-122, E-11,<4M4>
D-30, E-11, D-109, E-113
NG
Repair
NG
Replace
NG
Repair
N range indicator valve check
(Refer to GROUP 52A - Instrument
Panel.)
Check the following connectors:
D-01, D-03
DCheck the harness between the
combination meter and the
engine-A/T-ECU, and repair if
necessary. <6G7>
DCheck the harness between the
combination meter and the
A/T-ECU, and repair if necessary.
<4M4>
DCheck the harness between the
combination meter and earth.
DCheck the harness between the
combination meter and the
engine-A/T-ECU. <6G7>
DCheck the harness between the
combination meter and the
A/T-ECU.<4M4>


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AUTOMATIC TRANSMISSION -Troubleshooting 23-47
CHART CLASSIFIED BY TROUBLE SYMPTOMS
Trouble SymptomInspection pro-
cedure No.Reference page
Communication with the MUT-IIis not possible.123-48
Driving not possibleStarting not possible223-49
Does not move forward323-49
Does not reverse423-50
Does not move (forward or reverse)523-51
Malfunction when startingEngine stalls during shifting623-51
offN - to - D shocks, large time lag723-52
N - to - R shocks, large time lag823-53
N - to - D, N - to - R shocks, large time lag923-54
Problem during shiftingShocks, engine racing1023-54
Incorrect shift pointsAll points1123-55
Some points1223-56
No shiftingNo diagnosis code1323-56
Problem during drivingPoor acceleration1423-57
Vibration1523-57
Inhibitor switch system1623-58
Shift switch assembly system1723-58
Dual pressure switch system1823-59
Vehicle speed sensor system1923-59
4LLc switch system2023-60


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AUTOMATIC TRANSMISSION -Troubleshooting 23-48
INSPECTION PROCEDURES CLASSIFIED BY TROUBLE SYMPTOM
Inspection procedure 1
Communication with the MUT-II
is not possible.
Probable cause
If communication with the MUT-
IIis not possible, the cause is probably a
malfunction of the diagnosis line or the A/T-ECU is not functioning.DMalfunction of diagnosis line
DMalfunction of harness or connector
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
Is communication with other systems possible
using the MUT-
II?NOCheck the MUT-
IIdiagnosis line, and repair if
necessary.
YES
Measure at engine-A/T-ECU connector D-120,
D-121 <6G7>, or at A/T-ECU connectors D-107
and D-109 <4M4>.
DDisconnect the connector and measure at the
harness side.
DIgnition switch: ON
<6G7> Voltage between terminals 41, 47 and
earth
<4M4> Voltage between terminals 11, 24 and
earth
OKSystem voltage
<6G7> Continuity between terminals 76, 97,
88 and earth
<4M4> Continuity between terminals 13, 25,
26, 12, 72 and earth
OKContinuityOKCheck the following connectors:<6G7> D-120,
D-121, <4M4> D-107,D-109NG
Repair
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU or A/T-ECU.
NG
NG
Repair
OK
Check the trouble symptoms.NGDCheck the harness between the
engine-A/T-ECU and the ignition switch, and
repair if necessary. <6G7>
DCheck the harness between the A/T-ECU and
the ignition switch, and repair if necessary.
<4M4>
DCheck the harness between the
engine-A/T-ECU and earth, and repair if
necessary. <6G7>
DCheck the harness between the A/T-ECU and
earth, and repair if necessary.<4M4>
Check the following connectors:<6G7> A-04,
B-25X, D-128, D-120, D-121, D-14,<4M4> D-208,
D-213, D-32, E-13, D-107, D-109, D-14


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AUTOMATIC TRANSMISSION -Troubleshooting 23-49
Inspection procedure 2
Starting not possible
Probable cause
If the enginewill not start when the selector lever is at the P or N position, the
cause is probably a malfunction of the inhibitor switch system, the transmission
control cable assembly, theenginesystem, the torque converter or the oil pump.DMalfunction of inhibitor switch system
DMalfunction of transmission control cable assembly
DMalfunction of enginesystem
DMalfunction of torque converter
DMalfunction of oil pump
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
NG
Inspection Procedure 16: Inhibitor switch system check (Refer
to P.23-58.)NG
Repair or replace
OK
Torque converter check
DCheck for incorrect installation (inserted at an angle, etc.)
or damagedsplines.NGIf repair is possible, repair the damaged part.
If repair is not possible because the splines aredamaged,
replace the torque converter assembly.
OK
Replace the oil pumpassembly.
L
(The oilpump cannot be disassembled.)
Engine system check
DControl system, ignition system, fuel system, vehicle bodyNG
Repair
OK
Transmission control cable assembly checkNG
Repair OK
Check the trouble symptoms.Replace the engine-A/T-ECU or A/T-ECU.
Inspection procedure 3
Does not move forward
Probable cause
If the vehicle does not move forward when theengine is idling and theselector
lever is moved from N to D, 3, 2 or L, or if it is shifted to 1st or 2nd in Sports
mode, the cause is probably a problem with line pressure, or a malfunction of
the UD clutch or valve body.DAbnormal line pressure
DMalfunction of UD solenoid valve
DMalfunction of UD clutch system
DMalfunction of valve body
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
MUT-
IIActuator Test
DNo.2 UD solenoid valve
OK:Sound of operation can be heardNGReplace the solenoid valve.
L
OK
Fluid pressure test (Refer to P.23-106.)
DMeasure the fluid pressure at each element in 1st in
Sportsmode
Standard value:Refer to P.23-106.NGDisassemble, clean and re-assemble the valve body.
L
DMake sure that the mounting bolts are not loose and that
the O-ring and valve body are notdamaged or positioned
incorrectly.
DIf the extent of thedamagelooks too bad for repairs to be
carried out, replace the valve body assembly.
OK
UD clutch system check
DRemove the transmission assembly, the valve body cover
and the valve body.
DBlow air through the UD clutch oilhole in the transmission
case, and check that the piston operates to maintain
pressure.
UD clutch check
L
DCheck for a problem such as burnt facing, poor piston
sealing or interference with the retainer.OKCheck the trouble symptoms. NG
Replace the engine-A/T-ECU or A/T-ECU.NG


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AUTOMATIC TRANSMISSION -Troubleshooting 23-50
Inspection procedure 4
Does not reverse
Probable cause
If the vehicle does not reverse when theengine is idling and theselector lever
is moved from N to R, the cause is probably a problem with reverse clutch
pressure or LR brake pressure, or a malfunction of the reverse clutch, LD clutch
or valve body.DAbnormal reverse clutch pressure
DAbnormal LR brake pressure
DMalfunction of LR solenoid valve
DMalfunction of reverse clutch
DMalfunction of LR brake
DMalfunction of valve body
DReplacement of engine-A/T-ECU <6G7>
DReplacement of A/T-ECU.<4M4>
LRefer to the Transmission Workshop Manual.
NGReplace the solenoid valve.
L
OK
NG
OK
NG
Disassemble, clean and re-assemble the valve body.
L
DMake sure that the mounting bolts are not loose and that
the O-ring and valve body are notdamaged or positioned
incorrectly.
DIf the extent of thedamagelooks too bad for repairs to be
carried out, replace the valve body assembly.
OK
Reverse clutch system and LR brake system check
L
DRemove the transmission assembly, the valve body cover
and the valve body.
DBlow air through the reverse clutch oilhole or LRbrake
air hole in the transmissioncase, and check that the
piston operates to maintain pressure.OK
Check the reverse clutch and LR brake.
L
DCheck for a problem such as burnt facing, poor piston
sealing or interference with the retainer.NGCheck the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.NG
MUT-
IIActuator Test
DNo. 1 LR solenoid valve
OK:Sound of operation can be heard
Fluid pressure test (Refer to P.23-106.)
DMeasure the reverse clutch fluid pressure in R range.
Standard value:Refer to P.23-106.
Fluid pressure test (Refer to P.23-106.)
DMeasure the LR brake fluid pressure in R range.
Standard value:Refer to P.23-106.


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AUTOMATIC TRANSMISSION -Troubleshooting AUTOMATIC TRANSMISSION -Troubleshooting 23-51
Inspection procedure 5
Does not move (forward or reverse)
Probable cause
If the vehicle does not move forward or reverse when the selector lever is
moved to any position while the engine is idling, thecause is probably a
problem with line pressure or a malfunction of the oil pumps and valve bodies in
the power train.DAbnormal line pressure
DMalfunction of power train components
DMalfunction of oil pump
DMalfunction of valve body
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
Fluid pressure test (Refer to P.23-106.)
DMeasure the fluid pressure at each element in 1st, 2nd
and reverse.
Standard value:Refer to P.23-106.OKCheck the power train components
L
DDisassemble the transmission and check the condition of
components such as the planetary carrier, output shaft and
differential.
NG
Replace the oil pumpassembly.
L
(The oilpump cannot be disassembled.)
Disassemble, clean and re-assemble the valve body.
L
DMake sure that the mounting bolts are not loose and that
the O-ring and valve body are notdamaged or positioned
incorrectly.
DIf the extent of thedamagelooks too bad for repairs to be
carried out, replace the valve body assembly.NG
NG
Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.
Inspection procedure 6
Engine stalls during shifting
Probable cause
If the enginestalls when the selector lever is moved from N to D or R while the
engine is idling, thecause is probably a malfunction of theenginesystem, DCC
solenoid valve, valve body, or torque converter (damper clutch).DMalfunction of enginesystem
DMalfunction of DCC solenoid valve
DMalfunction of valve body
DMalfunction of torque converter (malfunction of
damper clutch)
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
Engine system check
DControl system, ignition system, fuel system, vehicle bodyNG
Repair or replace
OK
Replace the DCC solenoid valve.
L
Disassemble, clean and re-assemble the valve body.
L
DMake sure that the mounting bolts are not loose and that
the O-ring and valve body are notdamaged or positioned
incorrectly.
DIf the extent of thedamagelooks too bad for repairs to be
carried out, replace the valve body assembly.NGReplace the torque converter assembly.
Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.NG


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