check engine light MITSUBISHI MONTERO 2000 Service User Guide

GDI -Troubleshooting 13A-154
Code No.77 Accelerator pedal position sensor (2nd
channel) systemProbable cause
Range of Check
DAcceleratorpedal positionsensor (1st channel) is normal.
DCommunication between the engine-A/T-ECU and the throttle valve controller
is normal.
Set Conditions
DOutput voltage of the accelerator pedal positionsensor (2nd channel) is 0.2
V or less for one second
or
DOutput voltage of the accelerator pedal positionsensor (1st channel) is 2.5 V
or less, and output voltage of the acceleratorpedal positionsensor (2nd
channel) is 4.5 V or more for one second.
or
DDifference between the accelerator pedal positionsensor (1st and 2nd
channels) output voltages exceeds 1.0 V (i.e. when the throttle valveopening
anglechanges slightly).DMalfunction of accelerator pedal positionsensor
(2nd channel)
DOpen or short circuit in acceleratorpedal position
sensor (2nd channel) circuit or loose connector
contact
DMalfunction of the throttle valve controller
DMalfunction of engine-A/T-ECU
OKIntermittent malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Check the acceleratorpedal position
sensor (Refer to P.13A-229.)NG
Replace
OK
Measure at accelerator pedal position
sensor connector D-135
DDisconnect the connector and
measure at the harness side.
(1) The resistance between terminal
7 and earth
OK:
2Wor less
(2) The voltage between terminal 8
and earth
(Ignition switch: ON)
OK:
4.8 - 5.2 V(1) NGCheck the following connector:
D-11NG
Repair
OK
Check the following connector:
D-45NG
Repair
Check the harness wire between
accelerator pedal positionsensor
(2nd channel) and the throttle valve
controller.NG
Repair
OK
Check the trouble symptoms.NGReplace the throttle valve controller.
(2) NGMeasure at throttle valve controller
connector D-11.
DMeasure voltage at the throttle
valve controller connector
terminals.
DIgnition switch: ON
DThe voltage between terminal 6
and earth
OK:
4.8 - 5.2 VOK
OK
Check the harness wire between
accelerator pedal positionsensor
(2nd channel) and the throttle valve
controller, and repair if necessary.NG
Repair
NG
Check the following connector:
D-11NG
Repair
OK
Check the harness wire between
accelerator pedal positionsensor
(2nd channel) and the throttle valve
controller.NG
Repair
OK
To the nextpage
OK
Check the trouble symptoms.NGReplace the throttle valve controller. OK
MUT-
IIData list
77 Acceleratorpedal positionsensor
(2nd channel) (Refer to P.
13A-198, DATA LIST
REFERENCE TABLE.)
Check the following connector:
D-11


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GDI -Troubleshooting 13A-156
Code No.78 Accelerator pedal position sensor (1st
channel) systemProbable cause
Range of Check
DAcceleratorpedal positionsensor (2nd channel) is normal.
DCommunication between the engine-A/T-ECU and the throttle valve controller
is normal.
Set Conditions
DThe output voltage of accelerator pedal positionsensor (1st channel) is 0.2 V
or less for one second.
or
DThe output voltage of accelerator pedal positionsensor (2nd channel) is 2.5
V or less, and that of acceleratorpedal positionsensor (1st channel) is 4.5
V or more for one second
or
DThe difference between accelerator pedal positionsensor (1st channel) and
accelerator pedal positionsensor (2nd channel) output voltages is 1.0 V or
more (i.e. the throttle opening anglechanges slightly).
or
DThe output voltage of accelerator pedal positionsensor (1st channel) is 1.1 V
or more for one second when the acceleratorpedal positionswitch is turned
on.DMalfunction of accelerator pedal positionsensor
(1st channel)
DOpen or short circuit in the acceleratorpedal
position sensor (1st channel) circuit or loose
connector contact
DAcceleratorpedal positionswitch seized ON
DMalfunction of throttle valve controller
DMalfunction of engine-A/T-ECU
OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU, and repair if necessary.
NG
Check Acceleratorpedal position
sensor (1st channel) (Refer to
P.13A-229).NG
Replace
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
(2) NGMeasure at engine-A/T-ECU
connector D-120.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DIgnition switch: ON
DVoltage between terminal 46 and
earth
OK:
4.8 - 5.2 VOK
OK
MUT-
IIData list
78 Acceleratorpedal positionsensor
(1st channel) (Refer to 13A-198,
DATA LIST REFERENCE
TABLE.)OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
MUT-
IIData list
26 Acceleratorpedal positionswitch
(Refer to 13A-198, DATA LIST
REFERENCE TABLE.)NGCheck the acceleratorpedal position
switch system. (Refer to P.13A-192,
Inspection Procedure 28).
OK
Measure at accelerator pedal position
sensor connector D-135.
DDisconnect the connector and
measure at the harness side.
(1) Resistance between terminal 1
and earth
OK:
2Wor less
(2) Voltage between terminal 2 and
earth
(Ignition switch: ON)
OK:
4.8 - 5.2 V(1) NGCheck the following connector:
D-120NGRepair
NG
Repair
NG
Check the following connector:
D-117NG
Repair
OK
Check the following connector:
D-45NG
Repair
OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU.NG
Repair
OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU.NG
RepairOK
To the nextpage
Check the following connector:
D-120


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GDI -Troubleshooting 13A-171
Inspection procedure 5
No initial combustion (starting impossible)
Probable cause
In cases such as the above, the cause is probably that a sparkplug is
defective, or that the supply of fuel to the combustion chamber is defective.
In addition, foreign materials (water, kerosene, etc.) may be mixed with the fuel.DMalfunction of the fuel supply system
DMalfunction of the ignition system
DMalfunction of the engine-A/T-ECU
NGRepair
OK
MUT-
IIData list
22 Crankanglesensor (Refer to P.13A-198.)NGCheck the crankanglesensor system.
(Refer to P.13A-140, code No.22.)
YES
MUT-
IIActuator Test
07 Fuel pump(low pressure) (Refer to P.13A-203.)NGCheck fuelpump(low pressure) system
(Refer to P.13A-193, Inspection procedure 29.)
OK
Does the camshaft rotate when theengine is cranking?NOCheck if thetiming belt isbroken ordamaged.
NO
MUT-
IIData list
16 Battery voltage (Refer to P.13A-198.)NGCheck theengine controlrelay and ignition switch-IG system
(Refer to P.13A-190, Inspection procedure 25.)
OK
MUT-
IISelf-Diag Code
Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES
Check battery voltage when cranking.
OK:
8 V or higherNGCheck the battery.
OK
Is starting good if the engine iscranked with the accelerator
pedalslightly depressed?YESDClean the throttle valve area. (Refer to P.13A-220.)
DCheck and adjust the throttle position sensor (Refer to
P.13A-220.)
OK
MUT-
IIData list
79 Throttle position sensor (1st channel) (Refer to P.13A-198.)NGCheck the throttle position sensor (1st channel) system
(Refer to P.13A-158, code No.79.)
OK
MUT-
IIData list
21 Engine coolant temperature sensor (Refer to P.13A-198.)NGCheck theengine coolant temperaturesensor system
(Refer to P.13A-138, code No.21.)
OK
Measure low fuel pressure between the fuelpump(low
pressure) and fuelpump (highpressure) (Refer to P.13A-222.)NGRepair
OK
To the nextpage
NO
Adjust the throttle position sensor (Refer to P.13A-220.)
NG
Measure at injector driver connector B-19
DDisconnect the connector, and measure at the harness
side.
DThe voltage between terminals 4, 12, 21 and earth
(Ignition switch: ON)
OK
Battery voltage
Check fuel leakage (Refer to P.13A-225.)OK
Check the injector driver system.
(Refer to P.13A-196, Inspection procedure 34.) NG


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GDI -Troubleshooting 13A-172
OK
Check the following items in that order.
DCheck the sparkplug
DCheck the compression pressure
DCheck if foreign materials (water, alcohol, etc.) got into
fuel.
OK
Clamp the leads of the ignition coil No.1 terminal with atiming
light pick-up in order. Does thetiming lightflash when the
engine iscranked?NOCheck the ignition coil (built-in power transistor) system (Refer
to P.13A-148, code No.44.)
From the previouspage
OK
Check the trouble symptoms.
OK
Check ignition coil spark for each cylinder.
1. Remove the ignition coil.
2. Install a new sparkplug to the removed ignitioncoil.
3. Disconnect the injector intermediate connector.
Caution
Never touch the connector terminal as approx. 100 V is
applied to the injector, or you are seriously injured.
4. Earth the sparkplug electrodesecurely.
5. Check that the sparkplug igniteswhen theengine is
cranked.NGReplace the ignition coil.
YES
Check the ignitiontimingwhen cranking.
OK:
approx. 5_BTDCNGCheck that the crankanglesensor andtiming beltcover are
properly installed.
Replace the injector.NG
Inspection procedure 6
Initial combustion but no complete combustion (starting
impossible), long time to start (hard starting)
Probable cause
In such cases as the above, the cause is probably that the spark plugs are
generating sparks by the spark are weak, or the initial mixture is not appropriate.DMalfunction of fuel supply system
DMalfunction of of fuel pressure control solenoid
valve
DMalfunction of the ignition system
DMalfunction of the electronic-controlled throttle
valve system
DMalfunction of the engine-A/T-ECU
OK
MUT-
IIData list
21 Engine coolant temperature sensor (Refer to P.13A-198.)NGCheck theengine coolant temperaturesensor system (Refer
to P.13A-138, code No.21.)
OK
MUT-
IISelf-Diag Code
Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES.
Check the battery voltage when cranking.
OK:
8 V or higherNGCheck the battery.
NO
MUT-
IIActuator Test
07 Fuel pump(low pressure) (Refer to P.13A-203.)NGCheck fuelpumpsystem (low-pressure)
(Refer to P.13A-193, Inspection procedure 29.)
OK
To the nextpage


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GDI -Troubleshooting 13A-173
NGReplace the injector.Check the trouble symptoms.
OK
Check the following items in that order.
DCheck the sparkplug
DCheck the compression pressure
DCheck the fuel lines for clogging.
DCheck if foreign materials (water, alcohol, etc.) got into
fuel.
OK
Check ignition coil spark for each cylinder.
1. Remove the ignition coil.
2. Install a new sparkplug to the removed ignitioncoil.
Caution
Never touch the connector terminal as approx. 100 V is
applied to the injector, or you are seriously injured.
3. Disconnect the injector intermediate connector.
4. Earth the sparkplug electrodesecurely.
5. Check that the sparkplug igniteswhen theengine is
cranked.NGReplace the ignition coil.
Check the ignitiontimingwhen cranking.
OK:
Approx. 5_BTDCNGCheck that the crankanglesensor andtiming beltcover are
installed properly.
NO
Adjust the throttle position sensor (Refer to P.13A-220.)
OK
Is starting good if the engine iscranked with the accelerator
pedalslightly depressed?YESDClean the throttle valve area. (Refer to P.13A-220)
DAdjust the throttle position sensor
(Refer to P.13A-220.)
OK
MUT-
IIData list
79 Throttle position sensor (1st channel) (Refer to P.13A-198.)NGCheck the throttle valve position feedback system.
(Refer to P.13A-162, code No.92.)
OK
Check fuel leakage. (Refer to P.13A-225.)NGRepair
OK
MUT-
IIActuator Test
74 Fuel pressure sensor (Refer to P.13A-203.)NGCheck abnormal fuel pressure.
(Refer to P.13A-151, code No.56.)
OK
MUT-
IIData list
18 Cranking signal (Refer to P.13A-198.)NGCheck the ignition switch-ST system and inhibitor switch
(Refer to 13A-191, Inspection procedure 27.)
From the previouspage


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GDI -Troubleshooting 13A-195
Inspection procedure 32
Stop lamp switch system
Probable cause
The engine-A/T-ECU determines whether the brakepedal is depressed or not.
The engine-A/T-ECU selects a fuel injectionmode by determining thebrake
operation according to this information.DMalfunction of the stoplampswitch
DImproper connector contact,opencircuit or
short-circuited harness wire
DMalfunction of the engine-A/T-ECU
NG
Check the following connectors:
D-26 , D-27, D-124 NG
Repair
OK
Check the trouble symptoms.
OK
Check the following connector:
D-122NG
Repair
Stoplampswitch check (Refer to
GROUP 35 - Brake Pedal.)NG
Replace
OK
Measure at stoplampswitch
connector D-136.
DDisconnect the connector, and
measure at the harness side.
DThe voltage between terminal 2
and earth
OK
System voltageOKMeasure at the engine-A/T-ECU
connector D-122.
DDisconnect the connector, and
measure at the harness side.
DThe voltage between terminal 123
and earth
(Ignition switch: ON)
OK
0 - 3 V (when the brake
pedal is not depressed)
System voltage (when the
brakepedal is depressed)NG
NG
Repair OK
Check the trouble symptoms.
NG
Check the harness wire between the
engine-A/T-ECU and the stoplamp
switch, and repair if necessary.
NG
Check the harness wire between the
battery and the stoplampswitch,
and repair if necessary.
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
Check the following connectors:
D-26 , D-33, D-128, D-136,
D-124 , E-13
Inspection procedure 33
Small lamp switch system
Probable cause
The engine-A/T-ECU determines whether the smalllampswitch is on or off.
According to that information, the engine-A/T-ECU controls alternator output
current when the vehicle is started.DImproper connector contact,opencircuit or
short-circuited harness wire in thetaillamprelay
circuit.
DMalfunction of the engine-A/T-ECU
OK
Check the following connector:
D-121NGReplace
Measure at engine-A/T-ECU connector D-121.
DDisconnect the connector, and measure at the harness
side.
DThe voltage between terminal 86 and earth (Lighting
switch: ON)
OK:
System voltageNGCheck thetaillampcircuit. (Refer to ELECTRICAL WIRING.)
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.


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GDI -Troubleshooting 13A-203
ACTUATOR TEST REFERENCE TABLE
Item
No.Inspection
itemDrive ContentsInspection contentsNormal condi-
tionInspec-
tion pro-
cedure
No.Reference
page
01InjectorCut fuel to the
No.1 injector.Engine:
Idling after warming-upIdling condition
becomes differ-Code
No. 4113A-147
02Cut fuel to the
No.2 injector.
(Cut the fuel supply to each
injector in turn and check
cylinders which does notent (becomes
unstable, or the
engine stalls).
03Cut fuel to the
No.3 injector.affect idling.)
04Cut fuel to the
No.4 injector.
05Cut fuel to the
No.5 injector.
06Cut fuel to the
No.6 injector.
07Fuel pump
(low-pres-
sure)Operates the
fuel pump (low-
pressure) to cir-
culate fuel.Ignition
switch:
ONPinch the return
hose with fin-
gers to feel the
pulse of the fuel
being circulated.Pulse is felt.Proce-
dure
No.2913A-193
Operating
sound can be
heard around
the fuel tank.Sound of opera-
tion can be
heard
08Purge con-
trol solenoid
valveSolenoid valve
turns from OFF
to ON.Ignition switch: ONSound of opera-
tion can be
heard when so-
lenoid valve is
driven.Proce-
dure
No.3613A-197
17Basic ignition
timingSolenoid valve
turns from OFF
to ON.DEngine: Idling
DSet a timing light.
5_BTDC--
21Condenser
fanDrive the fan
motorDIgnition switch: ON
DA/C switch: ON
Fan motor runsProce-
dure
No.2113A-187
34Electronic-
controlled
throttle valve
systemStop the throttle
control servoIgnition switch: ONThe throttle
valve opens
slightlyCode
No. 9113A-161


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GDI -Troubleshooting 13A-206
Terminal
No.Normal condition Check condition (Engine condition) Check item
49Engine control relayIgnition switch: OFF0-3V
Ignition switch: ONSystem voltage
51EGR valve (A)Ignition switch: OFF to ON5-8V
53EGR valve (C)
(Repeatedly changes
for approx. 3 seconds)
60EGR valve (B)
62EGR valve (C)
52Power steering fluid
pressure switchEngine: Idling after
warming-upWhen steering wheel is
stationarySystem voltage
When steering wheel is
turned0-3V
55Barometric pressureIgnition switch: ONAt an altitude of 0 m3.7 - 4.3 V
sensor
At an altitude of 1,200 m3.2 - 3.8 V
56Camshaft position sen-Engine: Cranking0.4 - 3.0 V
sor
Engine: Idling0.5 - 2.0 V
58Ignition switch-STEngine: Cranking8 V or more
61A/C switch 2Refer to GROUP 55 - Troubleshooting (Check at A/C-ECU or Engine-ECU
Terminal).
63Injector open circuit
check signalEngine: Increases from idling up to 4,000 r/minThe voltage decreases
slightly (approx. 0.7 V)
from 4.5 - 5.0 V.
64Intake air temperature
sensorIgnition switch: ONWhen intake air tempera-
ture is 0_C3.2 - 3.8 V
When intake air tempera-
ture is 20_C2.3 - 2.9 V
When intake air tempera-
ture is 40_C1.5 - 2.1 V
When intake air tempera-
ture is 80_C0.4 - 1.0 V
65Air flow sensorEngine: Idling2.2 - 3.2 V
Engine speed: 2,500 r/min
66Backup power supplyIgnition switch: OFFSystem voltage
71Oxygen sensorEngine: Running at 2,500 r/min after warming-up
(Check by using a digital voltmeter.)Voltages of 0 V and 0.8
V alternate


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GDI -Troubleshooting 13A-207
Terminal
No.Normal condition Check condition (Engine condition) Check item
78Throttle position sen-
sor (2nd channel)Ignition switch: ONRelease the accelerator
pedal.4.0 V or higher
Depress the accelerator
pedal fully.0.4 - 0.6 V
79Accelerator pedal posi-
tion switchIgnition switch: ONRelease the accelerator
pedal.0-1V
Depress the accelerator
pedal slightly.4 V or more
80Vehicle speed sensorDIgnition switch: ON
DMove the vehicle slowly forwardVoltages of 0 and 8 - 12
V alternate (changes
repeatedly)
83A/C switch 1Engine: IdlingA/C switch: OFF0-3V
A/C switch: ON (Com-
pressor is operating)System voltage
86Small lamp switchLighting switch: OFF0-3V
Lighting switch: Tail light positionSystem voltage
87Sensor applied voltageIgnition switch: ON4.5 - 5.5 V
93Fuel pressure sensorEngine: Idling0.3 - 4.7 V
95Accelerator pedal posi-
tion sensor (1st chan-Ignition switch: ONRelease the accelerator
pedal.0.985 - 1.085 V
nel)
Depress the accelerator
pedal fully.4.0 V or higher
98Ignition switch-IGIgnition switch: ONSystem voltage
123Stop lamp switchDepress the brake pedal.System voltage
Release the brake pedal.0-3V


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DIESEL FUEL <4M4> -Troubleshooting13C-33
Item
No.Reference
page Code No.
or inspec-
tion proce-
dure No. Value to be
determined
as normal Inspection conditions Check item
06Vehicle
speed sen-
sorWhen drivingCompare the engine
speed displayed in the
speed meter with that
in MUT-IIMatchedCode No.
1713C-12
07Engine
speed sen-Engine: CrankingCompare the engine
speed displayed in theMatchedCode No.
1813C-13
sor (backup)Engine: Idlingtachometer with that in
MUT-II
08Engine
speed sen-Engine: CrankingCompare the engine
speed displayed in theMatchedCode No.
2113C-14
sorEngine: Idlingtachometer with that in
MUT-II
09Accelerator
pedal posi-Ignition switch: ONAccelerator pedal:
Idling position0.9 - 1.1VCode No.
1113C-8
tion sensor
(main)Accelerator pedal:
Fully opened position4.1 V or high-
er
10Idle switchIgnition switch: ONRelease the foot from
the accelerator pedal.0-1VCode No.
2313C-15
Step on the accelera-
tor pedal slightly4V or higher
11System volt-
ageIgnition switch: ONSystem volt-
ageProcedure
No. 1913C-31
13Timing con-Engine: After warmingIdling0%*1Code No.13C-16
trol valve*1up the engine2,500 r/min35 - 45%*125 or No.13C-20
High idling20 - 30%*143
14EGR com-
mand valueEngine: Idling0 - 100%*2–-
mand value
Engine: After warming up the engine
17Control
sleeve posi-Engine: After warming
up the engineIdling1.535 -
1.735 VCode No.
2613C-17
tion (target
value)2,500 r/minSlightly de-
creased.
High idling1.884 -
2.084 V
18Actual injec-Engine: After warmingIdling0.65 - 0.85 V––
tion timingup the engine2,500 r/min2.325 -
2.525 V
High idling3.814 -
4.014 V
19InjectionEngine: After warmingIdling0.3 - 0.5 V––
timing com-
mand valueup the engine2,500 r/min2.325 -
2.525 V
High idling3.814 -
4.014 V


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