2000 MITSUBISHI MONTERO check engine

AUTOMATIC TRANSMISSION -Troubleshooting 23-55
Inspection procedure 11
All points (incorrect shift points)
Probable cause
If all shift points are incorrect during driving, the cause is probably a malfunction
of the output speed sensor, APS or solenoid valve.DMalfunction of output shaft speed sensor
DMalfunction of APS
DMalfunction of solenoid valve
DAbnormal line pressure
DMalfunction of valve body
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
NGCode No. 23 Output shaft speed sensor system (Refer to
P.23-22.)
OK
NG
Code No. 11, 12, 14 APS system check (Refer to P.23-13, 14
and 15.)
OK
MUT-
IIData List
DNo. 31 RED solenoid valve duty ratio
DNo. 32 UD solenoid valve duty ratio
DNo. 33 2ND solenoid valve duty ratio
DNo. 34 OD solenoid valve duty ratio
DNo. 35 RED solenoid valve duty ratio
OK:
No.31 No.32 No.33 No.34 No.35
Driving at aconstant speed in 1st
0% 0% 100% 100% 0%
Driving at a constant speed in 2nd
100% 0% 0% 100% 0%
Driving at a constant speed in 3rd
100% 0% 100% 0% 0%
Driving at a constant speed in 4th
0% 0% 100% 0% 100%
Driving at a constant speed in 5th
0% 100% 0% 0% 100%NGReplace the solenoid valve.
L
NG
Check the trouble symptoms.
OK
Adjust the line pressure. (Refer to P.23-111.)
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.
Replace the engine-A/T-ECU or A/T-ECU.
MUT-
IIData List
DNo. 23 Output shaft speed sensor system
OK:Increases in proportion to vehicle speed.
MUT-
IIData List
DNo.11 APS
OK:Increases in proportion to the acceleratorpedal open-
ing angle.


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AUTOMATIC TRANSMISSION -Troubleshooting 23-56
Inspection procedure 12
Some points (incorrect shift points)
Probable cause
If some of the shift points are incorrect while driving, the cause is probably a
malfunction of the valve body, or it is a characteristic of control and is not a
malfunction.DMalfunction of valve body
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
INVECS-
IIcancel command
DCancels INVECS-
IIusing MUT-
II.
YES
Problem is a characteristic of control
and is not a malfunction. YES
Is standard shifting normal?NODoes the problem occur when the
ATF temperature is less than 35
°C
or higher than 120
°C?NODisassemble, 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 not
damaged or positionedincorrectly.
DIf the extent of thedamagelooks
too bad for repairs to be carried
out, replace the valve body
assembly.
Check the trouble symptoms.
Replace the engine-A/T-ECU or
A/T-ECU.NG
Inspection procedure 13
No diagnosis code (no shifting)
Probable cause
No shifting during driving
However, if a diagnosis code is not output, the cause is probably malfunction of
the inhibitor switch system, the shift switch assembly, theengine A/T-ECU or
the A/T-ECU.DMalfunction of Inhibitor switch
DMalfunction of shift switch assembly system
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
Does the transmission stay at 3rd in
D range?NOMUT-
IIData List
DNo. 61 Inhibitor switch
OK:The ECU input signal and
the selector lever position
should correspond.NGInspection Procedure 16: Inhibitor
switch system check (Refer to
P.23-58.)
YES
OK
NG
Inspection Procedure 17: Shift switch
assembly system check (Refer to
P.23-58.)
NO
Power supply circuit check
DCheck for anopencircuit in the
harness, a poor connector
connection or a blown fuse wire.
DIf there is a blown fuse, check
for whatever caused the blown
fuse and replace the problem
part.
YES
Replace the engine-A/T-ECU or
A/T-ECU.
MUT-
IIData List
DNo.67 Select switch
DNo.68 Shift switch (UP)
DNo.69 Shift switch (DOWN)
OK:The ECU input signal and
the selector lever position
should correspond.
Check the trouble symptoms.OK
NG
YES
Is powerbeing supplied to the
A/T-ECU or to the
engine-A/T-ECU? NO
Is the backup power supplybeing
supplied to the A/T-ECU or to the
engine-A/T-ECU?


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AUTOMATIC TRANSMISSION -Troubleshooting 23-57
Inspection procedure 14
Poor acceleration
Probable cause
If the vehicle does not accelerate after downshifting, the cause is probably a
malfunction of the enginesystem or of a brake or clutch.DMalfunction of enginesystem
DMalfunction of brake or 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
Brake and clutch check
L
DCheck for a problem such as burnt facing, poor piston
sealing or interference with the retainer.Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.NG
Inspection procedure 15
Vibration
Probable cause
If vibration occurs when accelerating or decelerating while driving at a constant
speed or driving in top range, the cause is probably abnormal damper clutch
pressure, or a malfunction of theenginesystem, DCC solenoid valve, torque
converter or valve body.DAbnormal damper clutch pressure
DMalfunction of enginesystem
DMalfunction of DCC solenoid valve
DMalfunction of torque converter
DMalfunction of valve body
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
NGReplace the DCC solenoid valve.
L
OK
Does the problem still occur when theengine coolant
temperature sensor is disconnected?YESEngine system check
DControl system, ignition system, fuel system, vehicle body
NO
Fluid pressure test (Refer to P.23-106.)
DMeasure the damper clutch fluid pressure.
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
Replace the torque converter assembly.Check the trouble symptoms.
Replace the engine-A/T-ECU or A/T-ECU.OK
MUT-
IIActuator Test
DNo. 6 DCC solenoid valve
OK:Sound of operation can be heard


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AUTOMATIC TRANSMISSION -Troubleshooting AUTOMATIC TRANSMISSION -Troubleshooting 23-58
Inspection procedure 16
Inhibitor switch system
Probable cause
The cause is probably a malfunction of the inhibitor switch circuit or the ignition
switch circuit.DMalfunction of Inhibitor switch
DMalfunction of ignition switch
DMalfunction of harness or connector
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
Inhibitor switch check (Refer to P.23-98.)NG
OK
Inhibitor switch connector C-05 voltage check
DDisconnect the connector and measure at the
harness side.
DVoltage between terminal 7 and earth
(Ignition switch: ON)
OK:System voltage
OKCheck the following connectors:D-208, D-213,
D-32, E-115, C-05NG
Repair
OK
Check the harness between the inhibitor switch
and the ignition switch.
OK
Check the trouble symptoms.
NGNG
Repair
Check the trouble symptoms.Replace
NG
Repair
Ignition switch check
NG
Repair
DCheck the harness between the inhibitor
switch and the engine-A/T-ECU. <6G7>
DCheck the harness between the inhibitor
switch and the A/T-ECU.<4M4>
OK
Replace the engine-A/T-ECU or A/T-ECU. NGNG
OK
Check the following connectors:<6G7> C-05,
E-113, D-128, D-122, <4M4>C-05, E-115, D-128,
B-109
Inspection procedure 17
Shift switch assembly system
Probable cause
The cause is probably a malfunction of the inhibitor switch circuit, shift switch
assembly circuit, or of the engine-A/T-ECU or A/T-ECU.DMalfunction of inhibitor switch
DMalfunction of select switch
DMalfunction of shift switch (UP)
DMalfunction of shift switch (DOWN)
DMalfunction of harness or connector
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
Inhibitor switch check (Refer to P.23-98.)NGInhibitor switch check
DInspection Procedure 16: Inhibitor switch system check
(Refer to P.23-58.)
OK
Shift switch assembly check (Refer to P.23-117.)NG
Replace
OK
DCheck the harness between the shift switch assembly and
the engine-A/T-ECU. <6G7>
DCheck the harness between the shift switch assembly and
the A/T-ECU.<4M4>NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU or A/T-ECU.
OK
Check the following connectors:<6G7> E-117, E-113,
D-122, <4M4> E-117, E-113,D-109NG
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 -Troubleshooting 23-60
Inspection procedure 20
4LLc switch system
Probable cause
The cause is probably a malfunction of the 4LLc switch circuit, or of the
engine-A/T-ECU or A/T-ECU.DMalfunction of 4LLc switch
DMalfunction of harness or connector
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
4LLc switch check (Refer to P.23-99.)NG
4LLc switch connector C-06 voltage check
DDisconnect the connector and measure at the
harness side.
DIgnition switch: ON
DVoltage between terminal 1 and earth
OKFSystem voltageCheck the following connectors:<6G7> C-06,
E-113, D-122, <4M4>C-06, E-113, D-107NG
Repair OK
Check the trouble symptoms.Replace
OKReplace the engine-A/T-ECU or A/T-ECU. NG
DCheck the harness between 4LLc switch and
the engine-A/T-ECU, and repair if necessary.
<6G7>
DCheck the harness between 4LLc switch and
the A/T-ECU, and repair if necessary.<4M4>
Check the following connector:C-06
NG
Repair
OK
NGOK


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AUTOMATIC TRANSMISSION -Troubleshooting 23-61
DATA LIST REFERENCE TABLE
Data
list No.Check itemInspection conditionsNormal condition
11APSIgnition switch: ON
Engine: StoppedAccelerator pedal:
Fully closed985 - 1085 mV
Engine: Stopped
Selector lever posi-
tion: P
Accelerator pedal:
DepressedGradually increases from the above
value.
Accelerator pedal:
Fully open4000 mV or higher
15A/T fluid tempera-
ture sensorDriving after en-
gine has warmed
upDrive for 15 minutes
or more until the ATF
temperature reaches
70 - 80°C.Gradually increases to 70 - 80°C.
21Crank angle sen-
sor <6G7>Engine: Idling
Selector lever posi-Compare the engine
speeds displayed onIdentical
sor <6G7>
Engine speed sen-
sor <4M4>Selector lever posi-
tion: Pspeeds displayed on
the tachometer and
the MUT-II.
22Input shaft speed
sensorShift range: 4thDriving at a constant
speed of 50 km/h in
4th1300 - 1600 r/min
23Output shaft speed
sensorShift range: 4thDriving at a constant
speed of 50 km/h in
4th1300 - 1600 r/min
25Wide open throttleAccelerator pedalReleasedOFF
switchpositionDepressedON
26Stop lamp switchIgnition switch: ON
Engine: StoppedBrake pedal: De-
pressedON
Engine: Stopped
Brake pedal: Re-
leasedOFF
29Vehicle speed sen-
sorSelector lever posi-
tion: Sports modeIdling in 1st
(Vehicle stopped)0 km/h
Driving at a constant
speed of 50 km/h in
3rd50 km/h
31LR solenoid valve
duty ratioSelector lever posi-
tion: Sports modeData List No.No. 31No. 32No. 33No. 34No.35
32UD solenoid valve
duty ratioDriving at a constant
speed in 1st0%0%100%100%0%
332nd solenoid valve
duty ratioDriving at a constant
speed in 2nd100%0%0%100%0%
34OD solenoid valve
duty ratioDriving at a constant
speed in 3rd100%0%100%0%0%
35RED solenoid
valve duty ratioDriving at a constant
speed in 4th0%0%100%0%100%
Driving at a constant
speed in 5th100%100%0%0%100%


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AUTOMATIC TRANSMISSION -Troubleshooting 23-62
Data
list No.Normal condition Inspection conditions Check item
36DCC solenoid
valve duty ratioShift range: 2ndDriving at 30 km/h in
2 range, then fully
close accelerator.70% - 90% -to- 0%
Driving at 50 km/h in
4th70% - 90%
52Damper clutch slip
amountShift range: 2ndDriving at 30 km/h in
2 range, then fully
close accelerator.- 300 - 100 r/min or 100 - 300 r/min
Driving at a constant
speed of 50 km/h in
4th- 10 - 10 r/min
54Control relay out-
put voltageIgnition switch:
OFFIgnition switch: ON10 - 12 V
61Inhibitor switchIgnition switch: ON
Engine: StoppedSelector lever posi-
tion: PP
Engine: Stopped
Selector lever posi-
tion: RR
Selector lever posi-
tion: NN
Selector lever posi-
tion: DD
63Shift positionSelector lever posi-
tion:
Sports modeDriving at a constant
speed of 10 km/h in
1st1st
Driving at a constant
speed of 30 km/h in
2nd2nd
Driving at a constant
speed of 50 km/h in
3rd3rd
Driving at a constant
speed of 50 km/h in
4th4th
Driving at a constant
speed of 70 km/h in
5th5th
65Dual pressureEngine: IdlingA/C switch: ONON
switchA/C switch: OFFOFF
66OD-OFFsignal
control is operatingWhile driving on a
level roadOFF
auto-cruise control
system>While climbing an
inclineON


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