2000 MITSUBISHI MONTERO service

AUTOMATIC TRANSMISSION -Troubleshooting 23-25
Code No. 26 Stop lamp switch systemProbable cause
If the stoplampswitch is continuously on for 5 minutes or more while the
vehicle isbeing driven, it is judged that there is ashort-circuit in the stoplamp
switch and code No. 26 is output.DMalfunction of brakepedal
DMalfunction of stoplampswitch
DMalfunction of harness or connector
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
NG
NG
MUT-
IIData List
DNo. 26 Stoplampswitch system
OK:The switch turns ON when
brakepedal is depressed
the switch turns OFF when
the brakepedal is released.Transient malfunction
(Refer to GROUP 00 - Points to
Note for Transient Malfunctions.) OK
OK OK OKNG
Repair
Repair
Check the following connectors:
D-26, D-27
D-124, D-27Check the harness between the stop
lampswitch and the battery, and
repair if necessary.
OK OK
NG
Brakepedal heightcheck
(Refer to GROUP 35A - On-vehicle
Service.)
OKNG
Adjust
OK
OK
NG
NG
Check the trouble symptoms.Replace the engine-A/T-ECU or
A/T-ECU.
Check the following connectors:
<6G7-L.H. drive vehicles> D-27, D-26,
D-33, E-13, D-128, D-122,
<6G7-R.H. drive vehicles> D-27, D-124,
E-13, D-128, D-122,
<4M4-L.H. drive vehicles> D-27, D-26,
D-33, E-13, D-128, D-109
<4M4-R.H. drive vehicles> D-27, D-124,
E-13, D-128, D-109Measure at engine-A/T-ECU
connector D-122 <6G7>, A/T-ECU
connector D-109 <4M4>.
DMeasure at the ECU terminals
D<6G7> Voltage between terminals
123 and earth
D<4M4> Voltage between terminal
59 and earth
OK:System voltage when brake
pedal is depressed
1 V or less when the brake
pedal is released
Measure at stoplampswitch
connector D-136.
DDisconnect the connector and
measure at the harness side.
DVoltage between terminals 2 and
earth
OK:System voltageNG
Replace
NG
Repair
Stoplampswitch check
(Refer to GROUP 35A - On-vehicle
Service.)
Check the following connector:
D-136
RepairNG
Check the following connectors:
<6G7> D-122,<4M4>D-109
DCheck the harness between the
stoplampswitch and the
engine-A/T-ECU, and repair if
necessary. <6G7>
DCheck the harness between the
stoplampswitch and the
A/T-ECU, and repair if necessary.
<4M4>
DCheck the harness between the
stoplampswitch and the battery,
and repair if necessary.


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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 23-59
Inspection procedure 18
Dual pressure switch system
Probable cause
The cause is probably a malfunction of thedualpressure switch circuit, or of the
engine-A/T-ECU or A/T-ECU.DMalfunction of dualpressure switch
DMalfunction of harness or connector
DMalfunction of A/C system
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
Dual pressure switch check
(Refer to GROUP 55 – On-Vehicle Service.)NG
Measure at engine-A/T-ECU connector D-121
<6G7> or at A/T-ECU connector D-107 <4M4>.
DDisconnect the connector and measure at the
harness side.
DIgnition switch: ON
DA/C switch: ON
D<6G7> Voltage between terminal 83 and earth
<4M4> Voltage between terminal 10 and
earth
OK:System voltage
OKCheck the following connectors:<6G7> D-121,
A-04,<4M4> D-107,A-04NG
Repair OK
Check the trouble symptoms.Replace
A/C system check (Refer to GROUP 55 -
Troubleshooting.)NG
Replace the engine-A/T-ECU or A/T-ECU. NG
Inspection procedure 19
Vehicle speed sensor system
Probable cause
The cause is probably a malfunction of the vehicle speed sensor circuit, or of
the A/T-ECU or the engine-A/T-ECU.DMalfunction of vehicle speed sensor
DMalfunction of connector
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
MUT-
IIData List
DNo.29 Vehicle speed sensor
OK:Refer to P.23-61 (Data List Chart).NO
Speedometer check
(Refer to GROUP 54A - Combination Meter.)
OK
OKNG NG
YES
Is the speedometer correct?
OK
Transient malfunction (Refer to GROUP 00 - Points to Note
for Transient Malfunctions.)
Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.NG
Check the following connectors:<6G7> C-09, E-113, E-13,
D-121<4M4>C-09, E-113, E-13, D-109
DCheck the harness between the engine-A/T-ECU and the
vehicle speed sensor. <6G7>
DCheck the harness between the A/T-ECU and the vehicle
speed sensor.<4M4>Repair
NG
Repair


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AUTOMATIC TRANSMISSION -Troublehshooting II>23-73
Code No. 21 Accelerator pedal position sensor (APS)
systemProbable cause
Code No. 21 is output to indicate anopencircuit in the APS or an incorrect
adjustment when the APS output voltage drops below 0.2 V while theengine is
idling.DMalfunction of APS
DMalfunction of harness or connector
DMalfunction of transfer-ECU
DMalfunction of throttle valve controller <6G7>
DMalfunction of engine-ECU <4M4>
NGNG
NG
Repair
MUT-
IIData List
DNo. 1 APS
OK:Refer to P.23-87 (Data List
Chart).
NG
ReplaceAPS single part check
(Refer to GROUP 13 - On-vehicle
Service.)
OK
NG
Repair
OK
Check the following connector:
D-135
OK
DCheck the harness between the
APS and the throttle valve
controller, and repair if necessary.
<6G7>
DCheck the harness between the
APS and the engine-ECU, and
repair if necessary.<4M4> OK
Check the following connectors:
<6G7> D-11,<4M4> D-112
Repair
NG
Repair
NG
Repair
OK
DCheck the harness between the
APS and the throttle valve
controller. <6G7>
DCheck the harness between the
APS and the engine-ECU. <4M4>
OK
Check the following connectors:
<6G7> D-11,<4M4> D-112
Measure at throttle valve controller
connector D-11 <6G7>, or at
engine-ECU connector D-112 <4M4>.
DMeasure at ECU terminals.
DIgnition switch: ON
D<6G7> Voltage between terminal
6 and earth
D<4M4> Voltage between terminal
60 and earth
OK:4.8 - 5.2 V
NGNG
NGCheck the trouble symptoms.Replace the throttle valve controller
or the engine-ECU.
OK
Measure at APS connector D-135
DDisconnect the connector and
measure at the harness side.
DVoltage between terminal 8 and
earth
(Ignition switch: ON)
OK:4.8 - 5.2 V
To the nextpage
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Transient Malfunctions.)
OK


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AUTOMATIC TRANSMISSION -Troublehshooting II>23-74
OKOK OK
NG
NG
NG(1)NGCheck the following connectors:
<6G7> D-11,<4M4> D-112
Repair OK
DCheck the harness between the
APS and the throttle valve
controller, and repair if necessary.
<6G7>
DCheck the harness between the
APS and the engine-ECU, and
repair if necessary.<4M4> OK (2)NG
Measure at transfer-ECU connector
E-105
DMeasure at ECU terminals.
DIgnition switch: ON
DVoltage between terminal 13 and
earth
OK:Fully close the accelerator
985 - 1,085 mV
fullyopen the accelerator
4,000 mV or more
Check the following connector:E-105
Check the trouble symptoms.OK
Check the following connectors:
E-105, E-113 NG
Replace the transfer-ECU. OK
NGRepair
Check the harness between the APS
and the transfer-ECU, and repair if
necessary.
Check the harness between the APS
and the transfer-ECU, and repair if
necessary.
From the previouspage
(3)NG
Measure at APS connector D-135.
DUse the test harness
(MB991658) to connect only
terminals 6, 7 and 8, and
measure at the pickup harness.
DIgnition switch: ON
(1) Voltage between terminal 7 and
earth
OK:0.5 V or less
(2) Voltage between terminal 8 and
earth
OK:4.8 - 5.2 V
(3) Voltage between terminal 6 and
earth
OK:Fully close the accelerator
985 - 1,085 mV
fullyopen the accelerator
4,000 mV or more
APS adjustment
(Refer to GROUP 13 - On-vehicle
Service.)
Check the following connectors:
E-113, E-105
Repair


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AUTOMATIC TRANSMISSION -Troublehshooting II>23-82
Code No. 34 Freewheel engage solenoid valve systemProbable cause
Code No. 34 is output to indicate anopencircuit or short-circuit in the freewheel
engage solenoidvalve when the transfer-ECU terminal voltages are not the
same while current isbeing supplied to the freewheel engage solenoidvalve.DMalfunction of freewheel engage solenoidvalve
DMalfunction of harness or connector
DMalfunction of transfer-ECU
NG
NG
MUT-
IIActuator Test
DNo. 1 Freewheel engage solenoidvalve
OK:The solenoid valve operates for 5 seconds.Transient malfunction (Refer to GROUP 00 - Points to Note
for Transient Malfunctions.) OK
OK OK OKNG
DCheck the harness between the freewheelengage solenoid
valve and the transfer-ECU, and repair if necessary.
DCheck the harness between the freewheelengage solenoid
valve and the ignition switch, and repair if necessary.Repair
Check the harness between the freewheelengage solenoid
valve and the ignition switch, and repair if necessary.
OK OK
OK
NG
Check the trouble symptoms.Replace the transfer-ECU.
Measure at transfer-ECU connector E-108
DMeasure at ECU terminals.
DTransfer: 4WD
DIgnition switch: ON
DVoltage between terminals 41 and earth
OK:System voltage
Measure at freewheel engage solenoidvalve connectors A-40
and A-41.
DDisconnect the connector and measure at the harness
side.
DIgnition switch: ON
DVoltage between terminal 1 and earth
OK:System voltageNG
Replace
NG
Repair
Freewheel engage solenoidvalve check
(Refer to GROUP 26 - On-Vehicle Service.)
Check the following connectors:A-40, A-41
Repair NG
Check the following connector:E-108
NG
Repair
OK
Check the following connectors: D-208,
D-210, D-27, A-15, A-16, A-04, E-113, E-108,
D-208, D-210, D-27, A-15, A-16, D-143, E-113, E-108,
Check the following connectors:D-208, D-210, D-27, A-15


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AUTOMATIC TRANSMISSION -On-vehicle Service23-100
Specified lubricant:
Hypoid gear oil SAE 75W-90 or 75W-85W
conforming to API GL-4
Oil level: 2.8 L
4. Install the oil filler plug, and tighten it to the specified
torque.
Tightening torque: 32±
2N×
m


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AUTOMATIC TRANSMISSION -On-vehicle ServiceAUTOMATIC TRANSMISSION -On-vehicle Service23-107
HYDRAULIC PRESSURE TEST DIAGNOSIS TABLE
SymptomProblem location
All hydraulic pressures are too highMalfunction of regulator valve
All hydraulic pressures are too lowMalfunction of oil pump
Blocked oil filter
Blocked oil cooler
Malfunction of regulator valve
Malfunction of relief valve
Incorrect valve body installation
Abnormal hydraulic pressure in R range
onlyMalfunction of regulator valve
Abnormal hydraulic pressure in 3rd or 4th
onlyMalfunction of regulator valve
Malfunction of switch bulb
Abnormal UD pressure onlyMalfunction of oil seal K, L, M or Q
Malfunction of underdrive solenoid valve
Malfunction of underdrive pressure control valve
Abnormality with check ball
Blocked orifices
Incorrect valve body installation
Abnormal REV pressure onlyMalfunction of oil seal A, B or C
Abnormality with check ball
Blocked orifices
Incorrect valve body installation
Abnormal OD pressure onlyMalfunction of oil seal D, E or F
Malfunction of overdrive solenoid valve
Malfunction of overdrive pressure control valve
Abnormality with check ball
Blocked orifices
Incorrect valve body installation
Abnormal DIR pressure onlyMalfunction of oil seal R, S or T
Malfunction of low & reverse solenoid valve (also used for the direct
clutch)
Malfunction of low & reverse pressure control valve
Malfunction of switch bulb
Malfunction of fail-safe valve C
Blocked orifices
Incorrect valve body installation
Abnormal LR pressure onlyMalfunction of oil seal I, J or P
Malfunction of low & reverse solenoid valve (also used for the direct
clutch)
Malfunction of low & reverse pressure control valve
Malfunction of switch bulb
Malfunction of fail-safe valve A
Abnormality with check ball
Blocked orifices
Incorrect valve body installation
Abnormal 2ND pressure onlyMalfunction of oil seal G, H or O
Malfunction of second solenoid valve
Malfunction of second pressure control valve
Malfunction of fail-safe valve B
Blocked orifices
Incorrect valve body installation


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