2000 MITSUBISHI MONTERO spark plugs

GDI -Troubleshooting GDI -Troubleshooting 13A-55
Code No.P0301 No.1 cylinder misfire detected.
Code No.P0302 No.2 cylinder misfire detected.
Code No.P0303 No.3 cylinder misfire detected.
Code No.P0304 No.4 cylinder misfire detected.
Code No.P0305 No.5 cylinder misfire detected.Probable cause
Range of Check
DThe enginespeed is 500 - 4,500 r/min.
DWhile the engine is runningexcept deceleration and sudden acceleration.
Set Conditions
DThe number of misfires exceeds a predetermined number per 200engine
revolutions (Misfire has occurred in only one cylinder).
or
DThe number of misfires exceeds a predetermined number per 100engine
revolutions (Misfire has occurred in only one cylinder).DMalfunction of the ignition system
DAbnormal compression
DMalfunction of injector
DMalfunction of engine-ECU
NG
Check the harness wire between the
ignition coil and the engine-ECU.
NG
Replace
NG
Repair
(2) NG
OK
Check the ignition failure sensor
(Refer to GROUP 16 - Ignition
System.)
OK
Check the harness wire between the
ignition coil and the earth, and repair
if necessary. (3) NG
OK
Measure at ignition coil connectors
B-101, B-108, B-112, B-113, B-116,
B-119.
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 3
and earth
(Engine: cranking)
OK:
0.5 - 4.0 V
(3) The resistance between terminal
2 and earth
OK:
2Wor less(1) NGCheck the following connectors:
B-04, B-107, D-208, D-223NG
Repair
Check the ignition coil (Refer to
GROUP 16 - Ignition System.)
Check the compression pressure.
(Refer to GROUP 11A - On-vehicle
Service.)Repair
Replace the engine-ECU.
OK
Check the harness wire between the
ignition coil and the ignition failure
sensor, and between the ignition coil
and the ignition failure sensor.
NG
Repair
OK
NGNG
Repair
OKReplace
NG
Check the spark plugs.
Check the trouble symptoms.
OK
Check the trouble symptoms.NGReplace the engine-ECU.
Check the following connectors:
B-101, B-108, B-112, B-113, B-116,
B-119
Check the following connector:
B-107, D-116
OK


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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-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-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-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-184
Inspection procedure 15
The feeling of impact or vibration 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
OK
Clean around the throttle valve. (Refer to P.13A-220.)
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
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
Are diagnosis codes displayed?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES.
Inspection procedure 16
Knocking
Probable cause
In case as the above, the cause is probably that the heat value of the spark
plug is inappropriate.DMalfunction of the detonation sensor
DImproper heat range of the spark plugs.
MUT-
IISelf-Diag Code
Is a diagnosis code set?YESRefer to P.13A-130, 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 ignition
timing is retarded fromwhen the detonation sensor connector
is connected.)NOCheck the detonation sensor system. (Refer to P.13A-146,
code No.31.)
YES
Check the following items in that order.
DSpark plugs
DCheck if foreign materials (water, kerosine,etc.) got into
fuel.
Inspection procedure 17
Run-on (Dieseling)
Probable cause
Fuel leakage from injectors is suspected.DMalfunction of the injector
Replace the injector.


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ENGINE ELECTRICAL -Ignition System16-39
Voltage: 1.5VTerminal No.
123
When current is
flowing
When current is
not flowing
SECONDARY COIL CHECK
NOTE
It is impossible to check the secondary coil through the
continuity check as a diode is integrated in the secondary
coil circuit of this ignition coil. So, check the secondary coil
in the following procedure.
1. Disconnect the ignition coil connector.
2. Remove the ignition coil and install a new spark plug
to the ignition coil.
3. Connect the ignition coil connector.
4. Earth the side electrode of the spark plug and crank
the engine.
5. Check that spark is produced between the electrodes of
the spark plug.
6. If no spark is produced, replace the ignition coil with a
new one and recheck.
7. If spark is produced with the new ignition coil, replace
the old one as it is faulty. If no spark is produced again,
the ignition circuit is suspected as faulty. Check the ignition
circuit.
SPARK PLUG CHECK AND CLEANING
Caution
1. The spark plug gap for iridium plugs should not be
adjusted.
2. Cleaning iridium plugs may result in damage to the
iridium tip. Therefore, if cleaning is necessary
because the plug is sooty, use a plug cleaner, and
do not clean the plug for more than 20 seconds in
order to preserve the electrodes. A wire brush should
never be used.
3. The spark plugs in GDI engines are special iridium
plugs in which the electrodes can become black even
when the plugs are working normally. Carbon which
may become deposited on these plugs burns off more
readily than with conventional plugs, and so should
not cause any problems with spark plug performance.
Judgement of whether a spark plug is operating
normally or not should be made by checking the
insulation resistance.


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