engine MITSUBISHI MONTERO 2000 Service Repair Manual

GDI -Troubleshooting <A/T>13A-178
Inspection procedure 10
When the engine becomes hot, it stalls at idling. (Die
out)
Probable cause
In such cases as the above, the cause is probably that ignition system, air/fuel
mixture, electronic-controlled throttle valve system, compression pressure is
defective. In addition, if the engine suddenlystalls, the cause may also be a
defective connector contact.DMalfunction of the ignition system
DMalfunction of the air/fuel ratio control system
DMalfunction of the electronic-controlled throttle
valve system
DMalfunction of the throttle body
DImproper connector contact
DDrawing air into intake system
OK
Check that air is sucked in the air intake system.
DBroken intake manifoldgasket
DDamaged vacuum hose
DDamaged air intake hoseOK
To the nextpage
OK
MUT-
IIData list
11 Oxygen sensor (Refer to P.13A-198.)
OK
0 - 400 mV and 600 - 1,000 mV alternates when
the engine is idling(wait for 2 minutes after the en-
gine is started).NGMeasure fuel high-pressure between the fuel pump (high
pressure) and injector. (Refer to P.13A-222.)
OK
MUT-
IIData list
11 Oxygen sensor (Refer to P.13A-198.)
OK
600 - 1,000 mV when theengine is suddenlyraced.NGCheck Oxygen sensor system
(Refer to P.13A-131, code No.11.)
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-
IIData list
25 Barometric pressure sensor (Refer to P.13A-198.)NGCheck the barometric pressure sensor system.
(Refer to P.13A-145, code No.25.)
OK
MUT-
IIData list
13 Intake air temperature sensor (Refer to P.13A-198.)NGCheck the intake air temperature sensor system.
(Refer to P.13A-135, code No.13.)
YES
MUT-
IIData list
26 Acceleratorpedal positionswitch
(Refer to P.13A-198.)NGCheck the acceleratorpedal positionswitch system.
(Refer to P.13A-192, Inspection procedure 28.)
NO
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.)
NO
MUT-
IISelf-Diag Code
Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES.
Has the batterybeen disconnectedrecently?YESAfter warming-up, let theengine run at idling for 10 minutes.
OK
Does theenginestall easilyagain?NOWhile carrying out an intermittent malfunction simulation test
(Refer to GROUP 00 - Points to Note for Intermittent
Malfunctions.), check for sudden changes in the signals shown
below.
DCrankanglesensor signal
DInjector activating signal
DLow pressure fuelpumpdrive signal
DAir flow sensor
DPrimary ignition signal
DEngine-A/T-ECU power supply voltage


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GDI -Troubleshooting <A/T>13A-179
OK
Check the following items in that order.
DCheck the sparkplug
DCheck the compression pressure
DCheck if foreign materials (water, kerosine,etc.) got into
fuel.
OK
MUT-
IIData list
68 EGR valve (Refer to P.13A-198.)NGCheck the EGR valve system (Refer to P.13A-196, Inspection
procedure 35.)
OK
MUT-
IIData list
28 A/C switch (Refer to P.13A-198.)NGCheck the A/C switch and A/C relay system
(Refer to P.13A-194, Inspection procedure 31.)
OK
MUT-
IIData list
27 Power steering oil pressure switch (Refer to P.13A-198.)NGCheck the power steering oil pressure switch system (Refer to
P.13A-194, Inspection procedure30.)
From the previouspage
NO
Check the ignition timing. (Refer to GROUP 11A - Engine
Adjustment.)OKCheck that the crankanglesensor andtiming beltcover are
properly installed.
NG
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.
OK
MUT-
IIData list
14 Throttle position sensor (2nd channel)
After warming-up, let theengine run at idlingwith no load.
OK:
3,900 - 4,800 mVNGDClean around the throttle valve. (Refer to P.13A-220)
DAdjust the throttle position sensor (Refer to P.13A-220.)
OK
MUT-
IIData list
34 Air flow sensor reset signal (Refer to P.13A-198.)NGCheck the air flow sensor system
(Refer to P.13A-133, code No.12.)
OK
Does theenginestall right after the acceleratorpedal is
released?YESClean around the throttle valve. (Refer to P.13A-220.)
OK
MUT-
IIData list
31 Small lampswitch (Refer to P.13A-198.)NGCheck the smalllampswitch system (Refer to P.13A-195,
Inspection procedure 33.)


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GDI -Troubleshooting <A/T>13A-180
Inspection procedure 11
The engine stalls when starting the car. (Pass out)
Probable cause
In cases such as the above, the cause is probably misfiring due to a weak
spark, or an inappropriate air/fuel mixture when the acceleratorpedal is
depressed.DMalfunction of the ignition system
DMalfunction of the EGR valve
DAir stuck in the air intake system
OK
MUT-
IIActuator Test
08 Purge control solenoid valve (Refer to P.13A-203.)NGCheck the purge control solenoid valve system
(Refer to P.13A-197, Inspection procedure 36.)
NO
MUT-
IIData list
68 EGR valve (Refer to P.13A-198)NGCheck the EGR valve system (Refer to P.13A-196, Inspection
procedure 35.)
MUT-
IISelf-Diag Code
Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES.
OK
Check the following items in that order.
DCheck the sparkplug
DCheck that air is sucked in the air intake system.
DBroken intakemanifoldgasket
DDamaged or disconnected vacuum hose
DDamaged air intake hose
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 mV 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.


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GDI -Troubleshooting <A/T>13A-181
Inspection procedure 12
The engine stalls when decelerating.
Probable cause
The cause is probably an improper air/fuel ratio due to a faulty EGR system, or
poor intake air volume due to a faulty electronic-controlled throttle valve system.DMalfunction of the electronic-controlled throttle
valve system
DMalfunction of the EGR valve
OK
Check the following items in that order.
DCheck the sparkplug
DClean around the throttle valve. (Refer to P.13A-220.)
DAdjust the throttle position sensor (Refer to P.13A-220.)
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.
NO
MUT-
IIData list
68 EGR valve (Refer to P.13A-198.)NGCheck the EGR valve system (Refer to P.13A-196, Inspection
procedure 35.)
OK
Check the vehicle speed sensor system
(Refer to P.13A-144, code No.24.)NGRepair
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.P92)
NO
MUT-
IIData list
26 Acceleratorpedal positionswitch (Refer to P.13A-198.)NGCheck the acceleratorpedal positionswitch system.
(Refer to P.13A-192, Inspection procedure 28)
NO
MUT-
IISelf-Diag Code
Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES.
Has the batterybeen disconnectedrecently?YESAfter warming-up, let theengine run at idling for 10 minutes.


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GDI -Troubleshooting <A/T>13A-182
Inspection procedure 13
Hesitation, sag, stumble, poor acceleration or surge
Probable cause
The cause is probably a malfunction of the ignition system, air/fuel ratio control
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
NO
NG
Check that the crankanglesensor andtiming beltcover are
properly installed.
OK
Check that air is sucked in the air intake system.
DBroken intake manifold gasket
DDamaged vacuum hose
DDamaged air intake hose
OK
To the nextpage
MUT-
IIData list
68 EGR valve (Refer to P.13A-198.)NGCheck the EGR valve system (Refer to P.13A-196, Inspection
procedure 35.)
OK
MUT-
IIData list
11 Oxygen sensor (Refer to P.13A-198.)
OK:
0 - 400 mV and 600 - 1,000 mV alternates when
the engine is idling(wait for 2 minutes after the en-
gine is started).NGMeasure fuel high-pressure between the fuel pump (high
pressure) and injector. (Refer to P.13A-222.)
OK
MUT-
IIData list
11 Oxygen sensor (Refer to P.13A-198.)
OK:
600 - 1,000 mV when theengine is suddenlyracedNGCheck the oxygen sensor system. (Refer to P.13A-131, code
No.11.)
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
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-
IIData list
25 Barometric pressure sensor (Refer to P.13A-198.)NGCheck the barometric pressure sensor system (Refer to
P.13A-145, code No.25.)
OK
MUT-
IIData list
13 Intake air temperature sensor (Refer to P.13A-198.)NGCheck the intake air temperature sensor system (Refer to
P.13A-135, code No.13.)
OK
MUT-
IIData list
26 Acceleratorpedal positionswitch
(Refer to P.13A-198.)NGCheck the acceleratorpedal positionswitch system.
(Refer to P.13A-192, Inspection procedure 28.)
Check the ignition timing. (Refer to GROUP11A - Engine
Adjustment)
MUT-
IISelf-Diag Code
Is a diagnosis code displayed?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES.
OK


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GDI -Troubleshooting <A/T>13A-183
OK
Check the following items in that order.
DCheck the sparkplug
DCheck the EGR control system
DCheck the compression pressure
DCheck the fuel filter or fuelline for clogging
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.
OK
Measure fuel high-pressure between the fuel pump (high
pressure) and injector. (Refer to P.13A-222.)NGRepair
From the previouspage
Check the trouble symptoms.Replace the injector. NG
OK
MUT-
IIActuator Test
08 Purge control solenoid valve
(Refer to P.13A-203.)NGCheck the purge control solenoid valve system
(Refer to P.13A-197, Inspection procedure 36.)
Inspection procedure 14
The feeling of impact or vibration when accelerating
Probable cause
In cases such as the above, the cause is probably that there is an ignition leak
accompanying the increase in the sparkplug demand voltage during
acceleration.DMalfunction of the ignition system
Replace the ignition coil.
NG
OK
Check the trouble symptoms.
OK
Check the sparkplugNGReplace
NO
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.)
MUT-
IISelf-Diag Code
Is a diagnosis code displayed?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES.


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GDI -Troubleshooting <A/T>13A-185
Inspection procedure 18
Too high CO and HC concentration when idling
Probable cause
Abnormal air-fuel ratio is suspected.DMalfunction of the air/fuel ratio control system
DDeteriorated catalyst
OK
To the nextpage
NG
Replace the ignition coil.
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
NG
Measure fuel high -pressure between the fuelpump (high
pressure) and injector. (Refer to P.13A-223.)
Check the trouble symptoms.
OK
MUT-
IIData list
11 Oxygen sensor (Refer to P.13A-198.)
OK:
Repeat 0 - 400 mV and 600 - 1,000 mV alternately
during idling(wait for at least 2 minutes after the
enginestarted to run at idle).OKReplace the oxygen sensor.
OK
MUT-
IIData list
11 Oxygen sensor (Refer to P.13A-198.)
OK:
600 - 1,000 mV when theengine is suddenlyracedNGCheck the oxygen sensor system. (Refer to P.13A-131, code
No.11.)
OK
MUT-
IIActuator Test
08 Purge control solenoid valve
(Refer to P.13A-203.)NGCheck the purge control solenoid valve system
(Refer to P.13A-197, Inspection procedure 36.)
OK
MUT-
IIData list
68 EGR valve (Refer to P.13A-198.)NGCheck the EGR valve system (Refer to P.13A-196, Inspection
procedure 35.)
OK
MUT-
IIData list
25 Barometric pressure sensor (Refer to P.13A-198.)NGCheck the barometric pressure sensor system (Refer to
P.13A-145, code No.25.)
OK
MUT-
IIData list
13 Intake air temperature sensor (Refer to P.13A-198.)NGCheck the intake air temperature sensor system (Refer to
P.13A-135, code No.13.)
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.)
NO
Check the ignition timing. (Refer to GROUP 11A - Engine
Adjustment.)NGCheck that the crankanglesensor andtiming beltcover are
properly installed.
MUT-
IISelf-Diag Code
Are diagnosis codes displayed?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES.


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GDI -Troubleshooting <A/T>13A-186
Check the trouble symptoms.NG
From the previouspage
Check the trouble symptoms.
Replace the catalytic converter.
OK
Check the following items in that order.
DCheck the sparkplug
DCheck the compression pressure
DCheck the positive crankcase ventilation system.
NG
Replace the injector.
Inspection procedure 19
Low alternator output voltage (approx.12.3 V)
Probable cause
The cause is probably a malfunction of the alternator or one of the problems
listed at right.DMalfunction of the charging system
DOpen circuit between the alternator G terminal and
the engine-A/T-ECU
DMalfunction of the engine-A/T-ECU
Measure at alternator connector B-59
DConnect the connector.
(Use test harness: MB991519)
DThe voltage between terminal 1
(black clip) and earth
(Engine: Idling)
(Headlamp: OFF to ON)
(Stoplamp: OFF to ON)
(Rear defogger switch: OFF to
ON)
OK:
The voltage increases by
0.2 - 3.5 VNGMeasure at alternator connector B-59
DDisconnect the connector, and
measure at the harness side.
DDisconnect the engine-A/T-ECU
connector
DThe continuity between terminal 1
and earth
OK:
No continuityNGCheck the harness wire between the
alternator and the engine-A/T-ECU,
and repair if necessary.
OK
Check the alternator
(Refer to GROUP16 - Charging
System.)NG
OK
Check the following connectors:
B-41, D-119Repair
OK
Replace the engine-A/T-ECU.
OK
Check the trouble symptoms.
NG
NG
Check the harness wire between the
alternator and the engine-A/T-ECU.Repair


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GDI -Troubleshooting <A/T>13A-187
Inspection procedure 20
Idling speed is improper when A/C is operating (A/C
switch 2 signal)
Probable cause
The A/C-ECU judges ifloadcaused by air conditioner ishigh or low, and
converts it to A/C switch 2 signal to send the engine-A/T-ECU it.
Based on this signal, the engine-A/T-ECU operates the throttle control servo to
control the idle-up speed.DMalfunction of the A/C control system
DOpen or short circuit, or loose connector contact
DMalfunction of the engine-A/T-ECU
OK
Check the trouble symptoms.
Check the harness wire between the engine-A/T-ECU and the
A/C-ECU.OKCheck the A/C system
(Refer to GROUP 55 - Troubleshooting.)
NGNG
RepairOK
Replace the engine-A/T-ECU.
Check the following connectors:
D-120, D-131, E-13
RepairNG
Inspection procedure 21
A/C condenser fan is inoperative
Probable cause
The fan motor relay is controlled by turning on and off the power transistor in
the engine-A/T-ECU.DMalfunction of the A/C condenser fan relay.
DMalfunction of the A/C condenser fan motor.
DOpen or short circuit, or loose connector contact
DMalfunction of the engine-A/T-ECU
NG
Replace the engine-A/T-ECU. OK
NG
RepairOK
Check the trouble symptoms.
Check the following connector:
D-119
Measure at the engine-A/T-ECU connector D-119.
DDisconnect the connector, and measure at the harness
side.
DCheck condition of the condenser fan.
(Ignition switch: ON)
OK:
Fan stops.
DThe voltage between terminal 18 and earth
(Ignition switch: ON)
OK:
System voltage
DConnect terminal 18 to earth.
(Ignition switch: ON)
OK:
A/C condenser fan rotates.NGCheck the condenser fan circuit. (Refer to ELECTRICAL
WIRING.)


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GDI -Troubleshooting <A/T>13A-188
Inspection procedure 22
GDI ECO indicator lamp does not illuminate.
Probable cause
If the GDI ECO indicator lampdoes notilluminate after turningswitch, the causes
listed in the right column are suspected.DBurned-out GDI ECO indicator lamp bulb
DOpen circuit or short-circuited harness wire in the GDI
ECO indicator lampcircuit
DMalfunction of the engine-A/T-ECU
DMalfunction of the GDI ECO indicator lamp ECU
NG
Repair
Measure at the engine-A/T-ECU connector D-119.
DDisconnect the connector, and measure at the harness side.
DEarth terminal 14 (Ignition switch: ON)
OK:
The GDI ECO indicator lamp illuminates.OKCheck the following connector:
D-119
OK
Check trouble symptom.
NG
Replace the engine-A/T-ECU.
NG
Check the following connectors:
E-13, E-112
Check trouble symptom.
Check the harness wire between the GDI ECO indicatorlamp
ECU and engine-A/T-ECU.
Check the relative circuit of GDI ECO indicatorlamp.(Refer to
GROUP 54A - Troubleshooting.)NG OK
OK NG
NG
Repair
Repair
Inspection procedure 23
GDI ECO indicator lamp remains illuminated and does
not go off.
Probable cause
If the GDI ECO indicator lampdoes not go off duringhigh load operation, thecauses
listed in the right column are suspected.DShort circuit between the GDI ECO indicatorlamp and
engine-A/T-ECU
DMalfunction of the engine-A/T-ECU
DMalfunction of the GDI ECO indicator lamp ECU
OK
Replace the engine-A/T-ECU.
Measure at GDI ECO indicator lamp ECUconnector E-112.
DDisconnect the connector, and measure at the harness side.
DDisconnect the engine-A/T-ECU connector.
DContinuity between terminal 3 and earth
OK:
No continuityNGCheck the harness wire between the GDI ECO indicatorlamp
ECU and engine-A/T-ECU, and repair if necessary.
OK
Check the relative circuit of GDI ECO indicatorlamp.(Refer to
GROUP 54A - Troubleshooting.)


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