ECU MITSUBISHI MONTERO 2000 Service Repair Manual

SWS -Troubleshooting54B-20
Inspection Procedure C-4
Central door locking system: Forgotten key prevention
function does not work.Probable cause
The ETACS-ECU operates the forgotten key prevention function, based on the
input signals from the following switches:
DKey reminder switch
DDriver’s door switch
DDriver’s door lock actuator switch
If the function does not work normally, a defect on the relevant circuit or the
ETACS-ECU may be suspected.DMalfunction of key reminder switch
DMalfunction of driver’s door switch
DMalfunction of driver’s door lock actuator
DMalfunction of ETACS-ECU
DMalfunction of harness wire or connector
NGCheck the defective input circuit. (Refer to P.54B-15, Defects Found
by Input Signal Check.)
OK
Replace the ETACS-ECU.
MUT-
IIinput signal check
DKey reminder switch
DDriver’s door switch
DDriver’s door lock actuator switch
Inspection Procedure D-1
Power window: Power window do not work at all.Probable cause
The power window relay or the ETACS-ECU may be defective.DMalfunction of power window relay
DMalfunction of ETACS-ECU
DMalfunction of harness wire or connector
OK
NG
NG
Repair
NG
Check the harness wire between power window relay and fusible
link (4).OK
NG
Repair
OK
Replace the ETACS-ECU.
NG
Check the harness wire between power window relay and power
window mainswitch, power window relay and ETACS-ECU.NG
Repair
OK
Check trouble symptoms.
Check the following connectors:
D-221, D-208, D-25, H-05, D-224
Check the power window relay. (Refer to GROUP 42 – Door.)NG
Replace
OK
Check trouble symptoms.
Measure at power window relay connector D-221.
DDisconnect connector and measure at J/B side.
DVoltage between terminal 5 and body earth.
OK:System voltage
DVoltage between terminal 3 and body earth.
OK:System voltageCheck the following connectors:
D-221 D-223, D-27


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SWS -Troubleshooting54B-23
Inspection Procedure D-4
Power window: Power window main switch can not
operate front passenger’s or rear window.Probable cause
The cause is probably a malfunction of the power windowmainswitch or front
passenger’s or rear power window motor, or an abnormality in the power supply
circuit.DMalfunction of power windowmainswitch
DMalfunction of front passenger’s or rear power
window motor
DMalfunction of harness wire or connector
NG
Replace the power windowmainswitch.
OK
Replace the power window motor.Check trouble symptoms.
NG
Check the harness wire between power windowmainswitch and
power window motor.NG
Repair
OK
Check trouble symptoms.
Ye s
NG
Check the power windowmainswitch input circuit. (P.54B-51, In-
spection Procedure P-16.)
OK
Check the following connectors:
Front L.H. door: H-05, D-25, D-31, D-15, H-04
Front R.H. door: H-05, D-25, D-31, D-15, H-16
Rear L.H. door: H-05, D-25, D-31, D-26, F-18, H-10
Rear R.H. door: H-05, D-25, D-31, D-124 F-04, H-23NG
Repair
MUT-
IIinput signal check
DPower windowmainswitch
Can the passenger’s side power window be operated by the
power window sub switch?NoCheck the power window sub switch circuit. (Refer to P.54B-22,
Inspection Procedure D-3.)
Inspection Procedure D-5
Power window: Power window timer function does not
work normally.Probable cause
The ETACS-ECU operates the power window timer function, based on the input
signals from the following switches:
DIgnition switch (IG1)
DDriver’s door switch
If the function does not work normally, a defect on the relevant circuit, power
window mainswitch or the ETACS-ECU may be suspected.DMalfunction of driver’s door switch
DMalfunction of power windowmainswitch
DMalfunction of ETACS-ECU
DMalfunction of harness wire or connector
OK
NoNGCheck the defective input circuit. (Refer to P.54B-15, Defects Found
by input Signal Check.)
NG
Replace the power windowmainswitch.
Check trouble symptoms.Replace the ETACS-ECU.
MUT-
IIinput signal check
DIgnition switch (IG1)
DDriver’s door switch
DPower windowmainswitch
Is a diagnosis code output when the ignition switch is at the
OFF (LOCK) position?Ye sCarry out troubleshooting while referring to the Diagnosis Code
Chart on P.54B-9.


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SWS -TroubleshootingSWS -Troubleshooting54B-24
Inspection Procedure D-6
Power window: When the glass is raised, it then lowers
automatically.Probable cause
If the sliding resistance is too large when the glass isbeing raised, it is judged
that something is jammed in the window, and the window is lowered by
approximately 150 mm.DIncorrect window glass adjustment
DGlass slider is incorrectly installed or warped
DMalfunction of power window motor
OK
Replace the power window motor.NG
Replace the window regulator assembly.
Check trouble symptoms.
Check the power window operating currant. (Refer to GROUP
42 – Door.)NGAdjust the window glass. (Refer to GROUP 42 – Door.)
Inspection Procedure D-7
Power window: The glass is jammed in the window.Probable cause
The cause may be a malfunction of the revolution detection sensor in the power
window motor.DMalfunction of power window motor
Replace the power window motor.
Inspection Procedure D-8
Power window: When the glass is fully raised, it then
lowers automatically.Probable cause
The cause may be a malfunction of the revolution detection sensor in the power
window motor.DMalfunction of power window motor
NG
Replace the power window motor.
Check trouble symptoms.
After disconnecting the battery terminals, set the limit switch.
(Refer to GROUP 42 - Door.)
Inspection Procedure E-1
Keyless entry system: Keyless entry system does not
operate.Probable cause
The ETACS-ECU operates the keyless entry system, based on the input signals
from the following switches:
DKey reminder switch
DDoor switches
DDriver’s door lock actuator switch
DTransmitter
If the function does not work normally, a defect on the relevant circuit or the
ETACS-ECU may be suspected.DMalfunction of key reminder switch
DMalfunction of door switches
DMalfunction of driver’s door lock actuator switch
DMalfunction of transmitter
DMalfunction of ETACS-ECU


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SWS -Troubleshooting54B-25
OK
Replace the ETACS-ECU.
NoCheck the central door locking system. (Refer to P54B-13, Trouble
Symptom Chart.)
Ye s
MUT-
IIinput signal check
DKey reminder switch
DDoor switches
DDriver’s door lock actuator switch
DTransmitterNGCheck the defective input circuit. (Refer to P.54B-15, Defects Found
by input Signal Check.)
Is the central door locking system operated normally?
Inspection Procedure E-2
Keyless entry system: The room lamp and hazard warning
lamps do not operate through the answerback function.Probable cause
The hazard warninglampanswerback function can be selected by the driver’s
desire (can be deactivated). However, the roomlampanswerback function can
not be deactivated. if all of these device do not operate through the answerback
function, the ETACS-ECU may be defective.DMalfunction of turn-signal lamp
DMalfunction of room lamp
DMalfunction of ETACS-ECU
DMalfunction of harness wire or connector
Ye s
Replace the ETACS-ECU.
NG
Are the room lamp andhazard warning lamps operated normally?NoCheck the defective device. (Refer to P.54B-13, Trouble Symptom
Chart.)
Check trouble symptoms.
Activate the answerback functions. (Refer to GROUP 42 – Keyless
Entry System or P.54B-60.)
Inspection Procedure E-3
Keyless entry system: The encrypted code cannot be
registered.Probable cause
The ETACS-ECU actives the encrypted code registermode according to the
following switch signals.
DKey reminder switch
DHazard warninglampswitch
If the encrypted code registermode is notset, the relevant input signal circuit or
the ETACS-ECU may be defective.
If a transmitter can not be registered although the encrypted code registermode
is set, the transmitter or the ETACS-ECU may be defective.DMalfunction of key reminder switch
DMalfunction of hazard warninglampswitch
DMalfunction of transmitter
DMalfunction of ETACS-ECU
DMalfunction of harness wire or connector
OK
Replace the ETACS-ECU.
Ye s
No
NG
Check the defective input circuit. (Refer to P.54B-15, Defects Found
by input Signal Check.)NG
Repair OKReplace the transmitter.
MUT-
IIinput signal check
DKey reminder switch
DHazard warninglampswitch
Is encrypted code registermodeset?Check the transmitter battery. (Refer to GROUP 42 - Keyless
Entry System.)


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SWS -Troubleshooting54B-27
Inspection Procedure F-2
Sunroof: Sunroof timer function does not work normally.Probable cause
The sunroof motor assembly operates the sunroof timer function, based on the
input signals from the following switches:
DIgnition switch (IG1)
DDriver’s door switch
If the function does not work normally, a defect on the relevant circuit, sunroof
motor assembly or the ETACS-ECU may be suspected.DMalfunction of driver’s door switch
DMalfunction of sunroof motor assembly
DMalfunction of ETACS-ECU
DMalfunction of harness wire or connector
OK
NoNGCheck the defective input circuit. (Refer to P.54B-15, Defects Found
by input Signal Check.)
NG
Replace the ETACS-ECU.
Check trouble symptoms.Replace the sunroof motor assembly.
MUT-
IIinput signal check
DIgnition switch (IG1)
DDriver’s door switch
DSunroof switch
Is a diagnosis code output when the ignition switch is at the
OFF (LOCK) position?Ye sCarry out troubleshooting while referring to the Diagnosis Code
Chart on P.54B-9.
Inspection Procedure F-3
Sunroof: Safety mechanism does not work normally.Probable cause
The sunroof motor assembly monitorsload condition according to thecurrent,
which runs in the motor. If a predetermined current is exceeded, the sunroof
motor reverses due to safety mechanism. If the sunroof motor does not reverse
when an excessiveload is applied, the sunroof motorassembly may be
defective.DMalfunction of sunroof motor assembly
Replace the sunroof motor assembly.


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SWS -Troubleshooting54B-28
Inspection Procedure G-1
Windshield wiper and washer: Windshield wiper does not
operate.Probable cause
If the windshield wiper does not work at all, the windshield wiper motor, column
switch or the front-ECU may be defective.DMalfunction of windshield wiper motor
DMalfunction of column switch
DMalfunction of front-ECU
DMalfunction of harness wire or connector
OK
NG
Replace
NG
Repair
NG
Repair
NG
Check the harness wire between windshield wiper motor and body
earth.
NG
Repair
NG
Check the harness wire between front-ECU and ignition switch
(ACC).
OK
Check trouble symptoms.
OK
Check trouble symptoms.
OK
Replace the front-ECU.
NG
NG
Repair
Check the harness wire between front-ECU and windshield wiper
motor.
OK
Check trouble symptoms.
OK
Check the following connectors:
B-12, A-05, A-08X
OK
Measure at front-ECU connector A-08X.
DDisconnect connector and measure at relay box side.
DTurn the ignition switch to ACC position.
DVoltage between terminal 24 and body earth.
OK:System voltageNGCheck the following connectors:
A-08X, D-27, D-223, D-208
OK
Measure at windshield wiper motor connector B-12.
DDisconnect connector and measure at harness side.
DContinuity between terminal 5 and body earth.
OK:ContinuityNGCheck the following connector:
B-12
Check the windshield wiper motor. (Refer to GROUP 51 – Wind-
shield Wiper and Washer.)
MUT-
IIinput signal check
DWindshield mist wiper switch
DWindshield intermittent wiper switch
DWindshield low-speed wiper switch
DWindshield high-speed wiper switchNGCheck the defective input circuit. (Refer to P.54B-15, Defects Found
by Input Signal Check.)


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SWS -Troubleshooting54B-29
Inspection Procedure G-2
Windshield wiper and washer: Any of the windshield
wiper switch positions is defective.Probable cause
The windshield wiper motor, column switch or the front-ECU may be defective.DMalfunction of windshield wiper motor
DMalfunction of column switch
DMalfunction of front-ECU
DMalfunction of harness wire or connector
NGCheck the defective input circuit. (Refer to P.54B-15, Defects Found
by Input Signal Check.)
OK
Replace the front-ECU.
OK
NG
Repair
NG
Check the harness wire between windshield wiper motor and front-
ECU.NG
Repair
OK
Check trouble symptoms.
Check the following connectors:
B-12, A-05, A-08X
OK
Check the windshield wiper motor. (Refer to GROUP 51 – Wind-
shield Wiper and Washer.)NG
Replace
MUT-
IIinput signal check
DWindshield mist wiper switch
DWindshield intermittent wiper switch
DWindshield low-speed wiper switch
DWindshield high-speed wiper switch
Inspection Procedure G-3
Windshield wiper and washer: Windshield wiper does not
stop at the predetermined park position.Probable cause
The windshield wiper motor or the front-ECU may be defective.DMalfunction of windshield wiper motor
DMalfunction of front-ECU
DMalfunction of harness wire or connector
NG
Replace
OK
NG
NG
Repair
NG
Check the harness wire between windshield wiper motor and ignition
switch (ACC).
NG
Repair
OK
Replace the front-ECU.
OK
NG
Check the harness wire between windshield wiper motor and front-
ECU.NG
Repair
OK
Check trouble symptoms.
Check the following connectors:
B-12, A-05, A-08X
OK
Check trouble symptoms.
Check the following connectors:
B-12, A-05, D-27, D-223, D-208Measure at windshield wiper motor connector B-12.
DDisconnect connector and measure at harness side.
DTurn the ignition switch to ACC position.
DVoltage between terminal 2 and body earth.
OK:System voltage
Check the windshield wiper motor. (Refer to GROUP 51 – Wind-
shield Wiper and Washer.)


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SWS -TroubleshootingSWS -Troubleshooting54B-30
Inspection Procedure G-4
Windshield wiper and washer: Windshield intermittent
wiper interval cannot be adjusted.Probable cause
The ETACS-ECU calculates the intermittent wiper interval, and sends a signal to
the front-ECU through the SWS communication line. If the signal is defective, the
front-ECU will ignore the signal and set the intermittent wiper interval to 4
seconds.DMalfunction of column switch
DMalfunction of front-ECU
DMalfunction of ETACS-ECU
DMalfunction of harness wire or connector
NGCheck the windshield intermittent wiper interval adjusting knob sig-
nal input circuit. (Refer to P.54B-50, Inspection Procedure P-15.)
NG
Replace the ETACS-ECU.
OK
Replace the front-ECU.Check trouble symptoms.
MUT-
IIinput signal check
DWindshield intermittent wiper interval adjusting knob
Inspection Procedure G-5
Windshield wiper and washer: Windshield washer does
not work.Probable cause
The windshield washer motor, the column switch or the front-ECU may be
defective.DMalfunction of windshield washer motor
DMalfunction of column switch
DMalfunction of front-ECU
DMalfunction of harness wire or connector
NoCheck the windshield wiper. (Refer to P.54B-13, Trouble Symptom
Chart.)
Ye s
NG
Check the windshield washer switch circuit. (Refer to P.54B-50,
Inspection Procedure P-14.)
OK
NG
Replace
OK
NG
NG
Repair
NG
Check the harness wire between windshield washer motor and
body earth.
OK
OK
Check trouble symptoms.
NG
Repair
NG
NG
Repair
OK
Replace the front-ECU.
Check the harness wire between windshield washer motor and
front-ECU.
Check the following connectors:
A-35, A-08X
OK
Check trouble symptoms.
Check the following connector:
A-35Measure at windshield washer motor connector A-35.
DDisconnect connector and measure at harness side.
DContinuity between terminal 2 and body earth.
OK:Continuity
Check the windshield washer motor. (Refer to GROUP 51 – Wind-
shield Wiper and Washer.)
MUT-
IIinput signal check
DWindshield washer switch
Is the windshield wiper operated normally?


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SWS -Troubleshooting54B-31
Inspection Procedure H-1
Rear wiper and washer: Rear wiper does not work
normally.Probable cause
The ETACS-ECU operates the rear wiper according to the input signals from the
following switches:
DIgnition switch (ACC)
DRear wiper switch
If the rear wiper does not work normally, the relevant input signal circuit, the
rear wiper motor, the column switch or the ETACS-ECU may be defective.DMalfunction of rear wiper motor
DMalfunction of column switch
DMalfunction of front-ECU
DMalfunction of harness wire or connector
NGCheck the defective input circuit. (Refer to P.54B-15, Defects Found
by Input Signal Check.)
OK
NG
Replace
OK
NG
NG
Repair
NG
Check the harness wire between rear wiper motor and body earth.
NG
Repair
OK
Replace the ETACS-ECU.
OK
NG
Check the harness wire between rear wiper motor and ETACS-ECU.NG
Replace
OK
Check trouble symptoms.
Check the following connectors:
I-07, G-06, D-124, D-218, D-224
I-07, G-06, D-219, D-224
OK
Check trouble symptoms.
Check the following connector:
I-08Measure at rear wiper motor connector I-07
DDisconnect connector and measure at harness side.
DContinuity between terminal 1 and body earth.
OK:Continuity
Check the rear wiper motor. (Refer to GROUP 51 – Rear Wiper
and Washer.)
MUT-
IIinput signal check
DIgnition switch (ACC)
DRear wiper switch
Inspection Procedure H-2
Rear wiper and washer: Rear wiper does not stop at the
predetermined park position.Probable cause
The rear wiper motor or the ETACS-ECU may be defective.DMalfunction of rear wiper motor
DMalfunction of front-ECU
DMalfunction of harness wire or connector
NGCheck the rear wiper auto-stop signal input circuit. (Refer to
P.54B-46, Inspection Procedure P-9.)
OK
Replace the ETACS-ECU.
MUT-
IIinput signal check
DRear wiper motor auto-stop signal


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SWS -Troubleshooting54B-32
Inspection Procedure H-3
Rear wiper and washer: When the shift lever or
selector lever is moved to R position during the rear
wiper operation, the rear wiper does not operate at the
continuous mode.Probable cause
The ETACS-ECU operates the rear wiper consecutively twice when the shift
lever or selector lever is moved to R position while the rear wiper
is turned on. If the rear wiper does not work consecutively twice, the back-up
lampswitch or the inhibitor switch (reverse) may be defective.DMalfunction of back-uplampswitch
DMalfunction of inhibitor switch
DMalfunction of ETACS-ECU
DMalfunction of harness wire or connector
NGCheck the defective input circuit. (Refer to P.54B-15, Defects Found
by Input Signal Check.)
OK
Replace the ETACS-ECU.
MUT-
IIinput signal check
DBack-uplampswitch
DInhibitor switch (reverse)
Inspection Procedure H-4
Rear wiper and washer: Rear washer does not work.Probable cause
The rear washer motor, the column switch or the ETACS-ECU may be defective.DMalfunction of rear washer motor
DMalfunction of column switch
DMalfunction of ETACS-ECU
DMalfunction of harness wire or connector
NoCheck the rear wiper. (Refer to P.54B-13, Trouble Symptom Chart.)
Ye s
NG
Check the rear washer switch circuit. (Refer to P.54B-50, Inspection
Procedure P-14.)
OK
NG
NG
Repair
NG
Check the harness wire between windshield washer motor and
body earth.
OK
NG
Repair
OK
Replace the ETACS-ECU.
NG
Check the harness wire between rear washer motor and ETACS-
ECU.NG
Repair
OK
Check trouble symptoms.
Check the following connectors:
I-08, G-06, D-124, D-223, D-224
OK
Check trouble symptoms.
Check the following connector:
I-08Measure at rear washer motor connector I-08.
DDisconnect connector and measure at harness side.
DContinuity between terminal 1 and body earth.
OK:Continuity
OK
Check the rear washer motor. (Refer to GROUP 51 – Rear Wiper
and Washer.)NG
Replace
MUT-
IIinput signal check
DRear washer switch
Is the rear wiper operated normally?


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