2000 MITSUBISHI MONTERO display

GDI -Troubleshooting 13A-89
Inspection procedure 13
Hesitation, sag, stumble, poor acceleration or surge
Probable cause
The cause is probably a malfunction of the ignition system, electronic-controlled throttle
valve system, compression pressure, etc.DMalfunction of the ignition system
DMalfunction of the air/fuel ratio control system
DMalfunction of the electronic-controlled throttle valve
system
DImproper compression pressure
DAir stuck in the air intake system
MUT-
IISelf-Diag code
Is a diagnosis code displayed?Ye s(Refer to P.13A-15, INSPECTION CHART FOR DIAGNOSIS
CODES.)
OK
Check ignition timing. (Refer to GROUP 11A - Engine Adjustment.)NGCheck that the crankanglesensor andtiming beltcover are properly
installed.
OK
NG
Check the acceleratorpedal positionswitch. (Refer to P.13A-100,
Inspection procedure 28.)
OK
MUT-
IIData list
13 Intake air temperature sensor (Refer to P.13A-105.)NGCheck the intake air temperature sensor. (Refer to P.13A-21, code
No. P0110.)
OK
MUT-
IIData list
25 Barometric pressure sensor (Refer to P.13A-105.)NGCheck the barometric pressure sensor. (Refer to P.13A-19, code
No. P0105.)
OK
MUT-
IIData list
21 Engine coolant temperature sensor (Refer to P.13A-105.)NGCheck theengine coolant temperaturesensor. (Refer to P.13A-22,
code No. P0115.)
OK
MUT-
IIData list
79 Throttle position sensor (1st channel) (Refer to P.13A-105.)NGCheck the throttle valve position feedback system. (Refer to
P.13A-65, code No. P1221.)
OK
MUT-
IIData list
11 Oxygen sensor (front)
OK:
0 - 400 mV and 600 - 1,000 mV alternates when the
engine is idling(wait for four minutes after theengine
started).NGMeasure fuel high-pressure between the fuel pump (highpressure)
and injector. (Refer to P.13A-224.)
OK
MUT-
IIData list
11 Oxygen sensor (front)
OK:
600 - 1,000 mV when theengine is suddenlyracedNGCheck the oxygen sensor (front) system. (Refer to P.13A-28, code
No. P0130.)
OK
Check that air is sucked in the air intake system.
DBroken intake manifold gasket
DDamaged vacuum hose
DDamaged air intake hose
OK
MUT-
IIData list
68 EGR valve (Refer to P.13A-105.)NGCheck the EGR valve. (Refer to P.13A-60, code No. P0403.)
OK
MUT-
IIActuator test
08 Purge control solenoid valve (Refer to P.13A-110.)NGCheck the purge control solenoid valve. (Refer to P.13A-62, code
No. P0443.)
OK
To the nextpage
OK
MUT-
IIData list
59 Oxygen sensor (rear) (Refer to P.13A-78.)
DTransmission: 2nd gear
DDriving with throttle widelyopen
OK:
600 - 1,000 mVNGCheck the oxygen sensor (rear) system. (Refer to P.13A-31, code
No. P0136.)
MUT-
IIData list
26 Acceleratorpedal positionswitch (Refer to P.13A-105.)


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GDI -Troubleshooting 13A-90
From the previouspage
OK
Measure high fuelpressure between the fuelpump (highpressure)
and injector. (Refer to P.13A-224.)NG
Repair
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 iscranked.NGReplace the ignition coil.
OK
Check all the following items:
DSparkplug
DEGR system
DCompression pressure
DClogged fuel filter, fuel lineNGCheck trouble symptom.
Replace the injector.
OK
Inspection procedure 14
The feeling of impact when accelerating
Probable cause
The cause is probably an ignition leakbeing generated in linewith an increase in
the sparkplug request voltage during acceleration.DMalfunction of the ignition system
NGReplace the ignition coil.
MUT-
IISelf-Diag code
Is a diagnosis code displayed?Ye s(Refer to P.13A-15, INSPECTION CHART FOR DIAGNOSIS
CODES.)
No
MUT-
IIData list
79 Throttle position sensor (1st channel) (Refer to P.13A-105.)NGCheck the throttle valve position feedback system. (Refer to
P.13A-65, code No. P1221.)
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 iscranked.OKCheck all the following items:
DSparkplug
DIgnition current leak


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GDI -Troubleshooting 13A-91
Inspection procedure 15
The feeling of impact when decelerating
Probable cause
The cause is probably insufficient intake air due to a faulty electronic-controlled throttle
valve system.DMalfunction of the electronic-controlled throttle valve
system
MUT-
IISelf-Diag code
Is a diagnosis code displayed?Ye s(Refer to P.13A-15, INSPECTION CHART FOR DIAGNOSIS
CODES.)
No
MUT-
IIData list
79 Throttle position sensor (1st channel) (Refer to P.13A-105.)NGCheck the throttle valve position feedback system. (Refer to
P.13A-65, code No. P1221.)
OK
MUT-
IIData list
26 Acceleratorpedal positionswitch (Refer to P.13A-105.)NGCheck the acceleratorpedal positionswitch system. (Refer to
P.13A-100, Inspection procedure 28.)
OK
Clean around the throttle valve. (Refer to P.13A-220.)
Inspection procedure 16
Knocking
Probable cause
The cause is probably incorrect detonation control or improper heat range of the
spark plugs.DMalfunction of the detonation sensor
DImproper heat range of the spark plugs
MUT-
IISelf-Diag code
Is a diagnosis code displayed?Ye s(Refer to P.13A-15, INSPECTION CHART FOR DIAGNOSIS
CODES.)
No
Does knocking occur when the vehicle is driven with the detonation
sensor disconnected?
(At this time, use the MUT-IIto check whether the ignitiontiming
is retarded from when the detonation sensor connector is con-
nected.)NoCheck the detonation sensor system. (Refer to P.13A-56, code
No. P0325.)
Ye s
Check all the following items:
DSparkplug
DForeign material (such as water or kerosine) entered the fuel
lines
Inspection procedure 17
Run-on (dieseling)
Probable cause
The cause is probably fuel leak from injector(s)DMalfunction of the injector
Replace the injector.


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GDI -Troubleshooting 13A-92
Inspection procedure 18
Too high CO and HC concentration when idling
Probable cause
The cause is probably an incorrect air/fuel ratioDMalfunction of air/fuel ratio control system
DDeterioration of the catalyst
MUT-
IISelf-Diag code
Is a diagnosis code displayed?Ye s(Refer to P.13A-15, INSPECTION CHART FOR DIAGNOSIS
CODES.)
No
Check ignition timing. (Refer to GROUP 11A - Engine Adjustment.)NGCheck that the crankanglesensor andtiming beltcover are properly
installed.
OK
MUT-
IIData list
21 Engine coolant temperature sensor (Refer to P.13A-105.)NGCheck theengine coolant temperaturesensor. (Refer to P.13A-22,
code No. P0115.)
OK
MUT-
IIData list
13 Intake air temperature sensor (Refer to P.13A-105.)NGCheck the intake air temperature sensor. (Refer to P.13A-21, code
No. P0110.)
OK
MUT-
IIData list
25 Barometric pressure sensor (Refer to P.13A-105.)NGCheck the barometric pressure sensor. (Refer to P.13A-19, code
No. P0105.)
OK
NG
Check the oxygen sensor (front) system. (Refer to P.13A-31, code
No. P0130.)
OK
MUT-
IIData list
11 Oxygen sensor (front)
OK:
0 - 400 mV and 600 - 1,000 mV alternates when the
engine is idling(wait for four minutes after theengine
started).OKReplace the oxygen sensor (front).
Check trouble symptom.
NGNG
Measure fuel high-pressure between the fuel pump (highpressure)
and injector. (Refer to P.13A-224.)NG
Repair
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 iscranked.
NG
Replace the ignition coil.
OK
Check all the following items:
DSparkplug
DEGR system
DCompression pressure
DClogged fuel filter or line
OK
To the nextpage
OK
MUT-
IIData list
59 Oxygen sensor (rear) (Refer to P.13A-78.)
DTransmission: 2nd gear
DDriving with throttle widelyopen
OK:
600 - 1,000 mVNGCheck the oxygen sensor (rear) system. (Refer to P.13A-31, code
No. P0136.)
MUT-
IIData list
11 Oxygen sensor (front)
OK:
600 - 1,000 mV when theengine is suddenlyraced


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GDI -Troubleshooting 13A-104
Inspection procedure 33
Small lamp switch system
Probable cause
The engine-ECU determines whether the small lampswitch is on or off.
According to that information, the engine-ECU controls
alternator output current when the vehicle is started.DImproper connector contact,opencircuit or
short-circuited harness wire in thetaillampcircuit
DMalfunction of the engine-ECU
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.
OK
Check the following connector:
D-118NG
Repair
Measure at the engine-ECU connector D-118.
DDisconnect the connector, and measure at the harness
side.
DVoltage between 88 and earth
(Lighting switch: ON)
OK:
System voltageNGCheck thetaillampcircuit. (Refer to ELECTRICAL WIRING.)
Inspection procedure 34
Injector driver system
Probable cause
The engine-ECU drives the injector by the drive signal.DMalfunction of the injector driver
DImproper connector contact,opencircuit or
short-circuited harness wire
DMalfunction of the engine-ECU
OK
Check the harness wire between the injector driver and engine-ECU.
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.Transient malfunction
(Refer to GROUP 00 - Points to Note for Intermittent
Malfunctions.) OK
Use a analyzer to measure the signal waveform at the engine-ECU
connectors D-116 and D-118.
DEngine: idling
DVoltage between 96 and earth, and between 1 and earth
OK:
A normal waveform should be displayed as described
on P.13A-118 (INSPECTION PROCEDURE USING
AN ANALYZER).NGReplace the injector driver.
NGCheck the following connectors:
B-121, D-116Repair
NG
Repair
OK


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GDI -Troubleshooting 13A-134
OK
Check the harness between the air
flow sensor and the engine-A/T-ECU.NG
Repair
OK
Check the harnesses between the
air flow sensor and the
engine-A/T-ECU and between the air
flow sensor and theengine control
relay, and repair if necessary.
From the previouspage
OK
Measure at air flow sensor connector
B-120.
DUse test harness (MB991709) to
connect the connector, and
measure at the pick-up harness.
DSelector lever position: P
DVoltage between terminal 7 and
earth
OK:
Engine: Idling
0-1V
Engine speed: 3,000 r/min
6-9VNGCheck the following connector:
D-119NGRepair
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.
Check the trouble symptoms.
NG
Check the following connectors:
D-120, D-121, B-25XNG
Repair
OK
Measure the output waveform from
at air flow sensor connector B-120
(by using an analyzer).
DUse test harness (MB991709) to
connect the connector, and
measure at the pick-up harness.
DEngine: Idling
DSelector lever position: P
DVoltage between terminal 3 and
earth
OK:
Waveform should be dis-
played on P.13A - 211 (In-
spection Procedure Using
an Analyzer) and noise
should not be displayed in
the waveformNGReplace the air flow sensor.
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.OK


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GDI -Troubleshooting 13A-141
OK
Check the harness wire between the
crankanglesensor and the
engine-A/T-ECU, and repair if
necessary.
MUT-
IIData list
22 Crankanglesensor (Refer to
P.13A-198, DATA LIST
REFERENCE TABLE.)OKIntermittent malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
OK
Measure at the crankanglesensor
connector B-52.
DDisconnect the connector and
measure at the harness side.
(1) The resistance between terminal
1 and earth
OK:
2Wor less
(2) The voltage between terminal 2
and earth
(Ignition switch: ON)
OK:
4.8 - 5.2 V
(3) The voltage between terminal 3
and earth
(Ignition switch: ON)
OK:
System voltage(1) NGCheck the harness between the
crankanglesensor and earth, and
repair if necessary.
NG
Repair
NG
Check the following connector:
D-120NG
Repair
NG
Check the following connector:
B-52NG
Repair
(2) NGMeasure at engine-A/T-ECU
connector D-120.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DDisconnect the connector B-52
DIgnition switch: ON
DThe voltage between terminal 45
and earth.
OK:
4.8 - 5.2 VOKCheck the following connector
:
D-120
Check the following connector:
B-25XNG
Repair
OK
Check the harness wire between the
crankanglesensor and the
engine-A/T-ECU.NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
(3) NG
OK
Check the harness wire between the
crankanglesensor and theengine
control relay, and repair if necessary.OK
Use an analyzer to measure the
output waveform at the crankangle
sensor connector B-52.
DUse the test harness
(MD998478) to connect the
connector, and measure at the
pickup harness side.
DEngine: Idling
DThe voltage between terminal 2
and earth
OK:
A normal waveform should
be displayed as described
on P.13A-212 (Inspection
Procedure Using an Ana-
lyzer). Its maximum value
should be 4.8 V or more,
and its minimumvalue
should be 0.6 V or less
with no noise in waveformNGCheck the crankanglesensor vaneNG
Replace
OK
Replace the crankanglesensor
OK
Check the trouble symptoms.
NG
NG
Repair
OK
Check the harness wires between
the crankanglesensor and the
engine-A/T-ECU, crankanglesensor
and the engine controlrelay, and the
crankanglesensor and earth. Then,
repair if necessary.
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.
Check the following connectors:
B-25X, D-120


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GDI -Troubleshooting 13A-143
OK
Check the harness wire between the
intermediate connector and the
engine-A/T-ECU, and repair if
necessary.NG
Repair
NG
NG
Repair
NG
Repair
(2) NGMeasure at engine-A/T-ECU
connector D-120.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DDisconnect connector B-110.
DIgnition switch: ON
DThe voltage between terminal 50
and earth
OK:
4.8 - 5.2 VOKCheck the following connector
:
D-120
Check the harness wire between the
intermediate connector and earth,
and repair if necessary.
OK
Check the harness wire between the
intermediate connector and the
engine controlrelay, and repair if
necessary.
(3) NG
OK
Measure at intermediate connector
B-110
DDisconnect the connector and
measure at the harness side.
(1) The voltage between terminal 1
and earth
(Ignition switch: ON)
OK:
System voltage
(2) The voltage between terminal 2
and earth
(Ignition switch: ON)
OK:
4.8 - 5.2 V
(3) The resistance between terminal
3 and earth
OK:
2Wor less(1) NGCheck the following connector:
B-25XNG
Repair
OK
Replace the camshaft position
sensor
Check the trouble symptoms.
OK
NG
Repair
OK
Check the harness wires between the intermediate connector and the engine-A/T-ECU,
the intermediate connector and theengine controlrelay, and the intermediate connector
and earth. Then, repair if necessary.
NG
Replace the engine-A/T-ECU.
OK
Check the harness wire between the
intermediate connector and the
engine-A/T-ECU.NG
Repair
OK
Use an analyzer to measure the
output waveform at intermediate
connector B-110.
DUse test harness (MB991658) to
connect the connector, and
measure at the pick-up harness.
DEngine: Idling
DSelector lever position: P
DThe voltage between terminal 2
and earth
OK:
A normal waveform should
be displayed as described
on P.13A-212 (Inspection
Procedure Using an Ana-
lyzer), its maximum value
should be 4.8 V or more,
and its minimumvalue
should be 0.6 V or less
with no noise in waveform.(1) NGCheck the following connector:
B-23NG
Repair
OK
Check the harness wire between the
camshaft position sensor and the
intermediate connector.NG
Repair
NG
Check the camshaft position sensing
cylinderNG
OK
Check the trouble symptoms.Intermittent malfunction
(Refer to GROUP 00 - Points to Note for Intermittent Malfunctions.)
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
Replace
OK
Check the following connector:
B-110
Check the following connector:
D-120
Check the following connectors:
B-25X, D-120


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