2000 MITSUBISHI MONTERO fuel pump

GDI -Troubleshooting 13A-160
Code No.89 Abnormal fuel systemProbable cause
Range of Check
DEngine: Being learning the air - fuel ratio
Set Conditions
DTen seconds or more havebeenpassed while the fuel injection amount
compensation value is too low.
or
DTen seconds or more havebeenpassed while the fuel injection amount
compensation value is too high.DMalfunction of fuel supply system
DMalfunction of oxygen sensor
DMalfunction of intake air temperature sensor
DMalfunction of barometric pressure sensor
DMalfunction of air flow sensor
DMalfunction of engine-A/T-ECU
Repair
OK
MUT-
IIData list
74 Fuel pressure sensor (Refer to
13A-198, DATA LIST
REFERENCE TABLE.)NGCheck fuel leakage around the fuel
pump (high-pressure) line.NG
NO
Check the air intake from the intake
hose and right bank intake manifold.NG
Repair
OK
Check the oxygen sensor (Refer to
P.13A-230.)NG
Replace
MUT-
IISelf-Diag Code
Is any diagnosis code other than
No.89 output?YESRefer to P.13A-130, INSPECTION
CHART FOR DIAGNOSIS CODES.
OK
Check the exhaust gas leaks from
the right bank exhaust manifold.NG
Cleaning
OK
Check the throttle body (around the
throttle valve), and clean if
necessary. (Refer to P.13A-220).NG
Cleaning
OK
MUT-
IIData list
11 Oxygen sensor
12 Air flow sensor
13 Intake air temperature sensor
21 Engine coolant temperature
sensor
25 Barometric pressure sensor
(Refer to 13A-198, DATA LIST
REFERENCE TABLE.)
Reference
If all the service data is normal, go
to “OK.”
If any abnormal service is found, go
to “NG.”NGRefer to the Inspection procedure for
the sensor, which is indicated by the
abnormal service data.
(Refer to P.13A-130, INSPECTION
CHART FOR DIAGNOSIS CODES.)OK
Replace the fuel pump
(high-pressure).
Check the purge control solenoid
valve (Refer to GROUP 17 -
Emission Control).NG
Replace
OK
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GDI -Troubleshooting GDI -Troubleshooting 13A-161
OK
Check the right bank injectors for
clogging or leaks.NG
Repair
OK
Check the right bank fuel lines for
fuel leaks.NG
Repair
OK
Check the fuel pressure between the
fuel pump(low-pressure) and the
fuel pump (high-pressure)(Refer to
P.13A-112).NG
From the previouspage
OK
Check the trouble symptoms.OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Replace the engine-A/T-ECU.
OK
Check the EGR valve (Refer to
GROUP 17 - Emission Control).NG
Replace
Check the fuelline between the fuel
pump(low-pressure) and the fuel
pump (high-pressure)(Refer to
P.13A-222).
Code No.91 Electronic-controlled throttle valve systemProbable cause
Range of Check
DIgnition switch: ON
DError in communication between the engine-A/T-ECU and the throttle valve
controller
Set Conditions
DOutput voltage of throttle position sensor (2nd channel) fluctuates significantly
(approx. 1 V or more) from an expected value, based on that of the
accelerator pedal positionsensor (2nd channel).
Range of Check
DIgnition switch: ON
DError in communication between the throttle valve controller and the
engine-A/T-ECU
Set Conditions
DThe output voltage of the throttle position sensor (2nd channel) is significantly
different (approx. 1 V) from the the throttle valveopening angle (voltage),
which the engine-A/T-ECU request the throttle valve controller.DShort in communicationline
DMalfunction of the engine-A/T-ECU
DMalfunction of the throttle valve controller
OK
Check the harness wire between the throttle valve controller
and the engine-A/T-ECU.NG
Repair
NG
Replace the engine-A/T-ECU.
Check the following connectors:
D-11, D-119, D-122NG
Repair
OK
NG
Replace the throttle valve controller.
Check the trouble symptoms.
Check the trouble symptoms.


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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
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GDI -Troubleshooting 13A-174
Inspection procedure 7
Unstable idling (Rough idling, hunting)
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. As
many causes can be suspected, diagnose from easier items.DMalfunction of the ignition system
DMalfunction of the air/fuel ratio control system
DMalfunction of the electronic-controlled throttle
valve system
DPoor compression
DAir sucking into the air intake system
OK
Check that air is sucked in the air intake system.
DBroken intake manifold gasket
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 suddenlyracedNG11 Oxygen sensor system check
(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
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.)
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.)
OK
Does theidlingspeed fluctuate excessively?YESDClean around the throttle valve. (Refer to P.13A-220)
DAdjust the throttle position sensor (Refer to P.13A-220.)
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.


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GDI -Troubleshooting 13A-177
Inspection procedure 9
When the engine is cold, it stalls at idling. (Die out)
Probable cause
In such cases as the above, the cause is probably that the air/fuel mixture is
inappropriate when theengine iscold, or that the intake air volume is
insufficient.DMalfunction of the electronic-controlled throttle
valve system
DMalfunction of the throttle body
OK
NG
Replace the injector.
Check the trouble symptoms.
Check the following items in that order.
DCheck the sparkplug
DCheck the compression pressure
DCheck theengine oilviscosity.
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
Check the ignition timing. (Refer to GROUP 11A - Engine
Adjustment.)NGCheck that the crankanglesensor andtiming beltcover are
properly installed.
NO
Measure fuel high-pressure between the fuel pump (high
pressure) and injector. (Refer to P.13A-222.)
OK
Does theenginestall right after the acceleratorpedal is
released?YESDClean around the throttle valve. (Refer to P.13A-220.)
DAdjust the throttle position sensor. (Refer to P.13A-220.)
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
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
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
14 Throttle position sensor (2nd channel) (Refer to P.13A-198.)NGCheck the throttle valve position feedback system.
(Refer to P.13A-162, code No.92.)
NO
Is engine-idling stable after the warming-up?YESCheck the unstableidling (rough, hunting).
(Refer to P.13A-174, Inspection procedure 7.)
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 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 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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