2000 MITSUBISHI MONTERO fuel

GDI -Troubleshooting 13A-81
Inspection procedure 7
Unstable idling (rough idle, hunting)
Probable cause
This malfunction is probably caused by a faulty ignition system, improper air/fuel ratio,
a faulty electronic-controlled throttle valve system, improper 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-control throttle valve
system
DImproper compression pressure
DAir sucking into the air intake system
Has the batterybeen disconnectedrecently?Ye sWarm up the engine, and then let it run at idle for approx. ten
minutes.
No
MUT-
IISelf-Diag code
Is a diagnosis code displayed?Ye sRefer to P.13A-15, INSPECTION CHART FOR DIAGNOSIS
CODES.
No
Does theengine idlespeed fluctuates excessively (excessivehunt-
ing)?Ye sClean around the throttle valve. (Refer to P.13A-220.)
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-110.)NGCheck the acceleratorpedal positionswitch system. (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 system. (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 system. (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-
IIActuator test
08 Purge control solenoid valve (Refer to P.13A-110.)NGCheck the purge control solenoid valve system. (Refer to P.13A-62,
code No. P0443.)
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
MUT-
IIData list
59 Oxygen sensor (rear)
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.)
OK
To the nextpage


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GDI -Troubleshooting 13A-82
OK
Check that air is sucked in the air intake system.
DBroken intake manifold gasket
DDamaged vacuum hose
DDamaged air intake hose
From the previouspage
OK
MUT-
IIData list
27 Power steering fluid pressure switch (Refer to P.13A-105.)NGCheck the power steering fluid pressure switch system. (Refer
to P.13A-102, Inspection procedure 30.)
OK
MUT-
IIData list
28 A/C switch (Refer to P.13A-105.)NGCheck the A/C switch and A/C relay system. (Refer to P.13A-102,
Inspection procedure 31.)
OK
MUT-
IIData list
67 Stoplampswitch (Refer to P.13A-105.)NGCheck the stoplampswitch. (Refer to P.13A-103, Inspection proce-
dure 32.)
OK
MUT-
IIData list
31 Small lampswitch (Refer to P.13A-105.)NGCheck the smalllampswitch system. (Refer to P.13A-104, Inspec-
tion procedure 33.)
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
NG
Check that the crankanglesensor andtiming beltcover are properly
installed.
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 trouble symptom.
Check all the following items in that order.
(1) Spark plugs
(2) Exhaust gas emission control system
(3) EGR system
(4) Compression pressure
(5) Foreign material (such as water or kerosine)entered the fuel
line.
(6) Air is sucked in the air intake system, or EGR gas leaks.
DDamaged intake manifoldgasket
DDamaged air intake hose
DDamaged vacuum hose
DFaulty EGR valve seat
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).NG
NG
Repair
Measure fuel high-pressure between the fuel pump (highpressure)
and injector. (Refer to P.13A-224.)
Clean around the throttle valve. (Refer to P.13A-220.)
NG
Check ignition timing. (Refer to GROUP 11A - Engine Adjustment.)


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GDI -Troubleshooting 13A-84
Inspection procedure 9
When the engine is cold, it stalls at idling. (Die out)
Probable cause
The cause is probably an incorrect air/fuel ratio or poor intake airamountwhen the
engine iscold.DMalfunction of the electronic-control throttle valve
system
DMalfunction of the throttle body
Have the battery terminalsbeen disconnectedrecently?Ye sWarm up the engine, and then let it run at idle for approx. ten
minutes.
No
MUT-
IISelf-Diag code
Is a diagnosis code displayed?Ye s(Refer to P.13A-15, INSPECTION CHART FOR DIAGNOSIS
CODES.)
No
Is the engine idlingcorrect after theengine has been warmed up?Ye sRefer to “Unstableidling (rough idle, hunting).”(Refer to P.13A-81,
Inspection procedure 7.)
No
MUT-
IIData list
22 Crankanglesensor (Refer to P.13A-105.)
Checkidlingspeed when theengine iscold.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 accelerator position switch. (Refer to P.13A-100, Inspec-
tion procedure 28.)
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
68 EGR valve (Refer to P.13A-105.)NGCheck the EGR valve system. (Refer to P.13A-60, code No. P0403.)
OK
Does theenginestall immediately after the acceleratorpedal is
released?Ye sClean around the throttle valve. (Refer to P.13A-220.)
No
Measure fuel highpressure between the fuelpump (highpressure)
and injector. (Refer to P.13A-224.)NG
Repair
OK
Check ignition timing. (Refer to GROUP 11A - Engine Adjustment.)NGCheck that the crankanglesensor andtiming beltcover are properly
installed.
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:
DSpark plugs
DCompression pressure
DEngine oilviscosityNGCheck trouble symptom. OK
Replace the injector.


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GDI -Troubleshooting 13A-85
Inspection procedure 10
When the engine is hot, it stalls at idling. (Die out)
Probable cause
The cause is probably an improper air/fuel ratio, faulty electronic-controlled throttle
valve system, compression pressure. In addition, if theenginestalls suddenly, another
possible causemight be a poorconnector contact.DMalfunction of the ignition system
DMalfunction of air/fuel ratio control system
DMalfunction of electronic-controlled throttle valve
system
DMalfunction of the throttle body
DPoor connector contact
DImproper compression pressure
DAir stuck in the air intake system
NG
Repair
Have the battery terminalsbeen disconnectedrecently?Ye sWarm up the engine, and then let it run at idle for approx. ten
minutes.
No
MUT-
IISelf-Diag code
Is a diagnosis code displayed?Ye sRefer 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
Is it easy to reproduce theengine stall?NoWhile carrying out an intermittent malfunction simulation test. (Refer
to GROUP 00 - Points to Note for Intermittent Malfunction.), check
for sudden changes in the following signals.
DCrankanglesensor signal
DInjector drive signal
DFuel pump(low pressure) drive signal
DAir flow sensor
DPrimary ignition signal
DPower supply to the engine-ECU
Ye s
MUT-
IIData list
26 Acceleratorpedal positionswitch (Refer to P.13A-105.)NGCheck 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
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
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
Check that air is sucked in the air intake system.
DBroken intakemanifoldgasket
DDamaged vacuum hose
DDamaged air intake hoseOK
To the nextpage
OK
MUT-
IIData list
59 Oxygen sensor (rear)
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.)


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GDI -Troubleshooting 13A-86
From the previouspage
OK
MUT-
IIData list
27 Power steering fluid pressure switch (Refer to P.13A-105.)NGCheck the power steering fluid pressure switch system. (Refer
to P.13A-102, Inspection procedure 30.)
OK
MUT-
IIData list
28 A/C switch (Refer to P.13A-105.)NGCheck the A/C switch and A/C relay system. (Refer to P.13A-102,
Inspection procedure 31.)
MUT-
IIData list
31 Small lampswitch (Refer to P.13A-105.)NGCheck the smalllampswitch system. (Refer to P.13A-104, Inspec-
tion procedure 33.)
OK
MUT-
IIData list
34 Air flow sensor reset signal (Refer to P.13A-105.)NGCheck the air flow sensor system. (Refer to P.13A-17, code No.
P0100.)
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
Ye s
Clean around the throttle valve. (Refer to P.13A-220.)
No
NG
Check that the crankanglesensor andtiming beltcover are properly
installed.
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:
DSpark plugs
DCompression pressure
DForeign material (such as water or kerosine) entered the fuel
linesOK
Check ignition timing. (Refer to GROUP 11A - Engine Adjustment.)
Does theenginestall immediately after the acceleratorpedal is
released?


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GDI -Troubleshooting 13A-87
Inspection procedure 11
The engine stalls when starting the car. (Pass out)
Probable cause
The cause is probably poor ignition due to a malfunctioning sparkplug(weak spark),
or an incorrect air/fuel ratio when the accelerator is depressed.DMalfunction of the ignition system
DMalfunction of the EGR valve
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.)
No
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 system. (Refer to P.13A-62,
code No. P0443.)
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:
(1) Sparkplug
(2) Check if air is stuck in the air intake system.
DDamage intake manifoldgasket
DDamaged or disconnected vacuum hose
DDamaged air intake hose


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GDI -Troubleshooting 13A-88
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
Have the battery terminalsbeen disconnectedrecently?Ye sWarm up the engine, and then let it run at idle for approx. ten
minutes.
No
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
26 Acceleratorpedal positionswitch (Refer to P.13A-105.)NGCheck the acceleratorpedal positionswitch. (Refer to P.13A-100,
Inspection procedure 28.)
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
68 EGR valve (Refer to P.13A-105.)NGCheck the EGR valve system. (Refer to P.13A-69, code No. P0403.)
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
DClean around the throttle valve (Refer to P.13A-220.)


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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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