Oil MITSUBISHI MONTERO 2000 Service Workshop Manual

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-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-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-128
FAIL-SAFE FUNCTION REFERENCE TABLE
When the main sensor malfunctions are detected by the diagnosis function, the vehicle is controlled
by means of the pre-set control logic to maintain safe conditions for driving.
Malfunctioning itemControl contents during malfunction
Air flow sensor1. Suspends lean burn operation.
2. Uses the throttle position sensor signal and engine speed signal (crank angle
sensor signal) to take reading of the basic injector drive time and basic ignition
timing from the pre - set mapping.
Intake air temperature sensorControls as if the intake air temperature is 25_
C.
Throttle position sensor (2nd
channel)1. Suspends lean burn operation.
2. Controls the throttle opening angle feedback (half as much as the opening
rate in the normal condition) by using signals from the throttle position sensor
(1st channel). However, this controlling system is not applied if the throttle
position sensor (1st channel) and throttle position sensor (2nd channel)
combination output voltage is outside 4 - 6 V.
3. Refrains from controlling the throttle opening angle feedback if the throttle
position sensor (1st channel) is also defective.
Engine coolant temperature
sensorControls as if the engine coolant temperature is 80_
C. (Moreover, the control system
is working until the ignition switch is turned OFF if the sensor signal returns to normal.)
Camshaft position sensorCuts the fuel supply once a malfunction is detected. (Only when there has been
no occasion of detecting No.1 cylinder top dead centre after the ignition switch
is turned ON.)
Vehicle speed sensor1. Suspends lean burn operation. However, the control is cancelled as a certain
time passes by with the engine speed of 1,500 r/min or more.
2. Suspends lean burn operation during the engine idling.
Barometric pressure sensorControls as if the barometric pressure is 101 kPa.
Detonation sensorFixes the ignition timing as that for regular gasoline.
Injector1. Suspends lean burn operation.
2. Suspends the exhaust gas recirculation.
Ignition coil (incorporating pow-
er transistor)1. Suspends lean burn operation.
2. Cuts off the fuel supply to cylinders with an abnormal ignition signal.
Fuel pressure sensor1. Controls as if the fuel pressure is 5MPa.
2. Suspends fuel injection. (when the low pressure is detected and the engine
speed is more than 3,000r/min)
Alternator FR terminalRefrains from controlling to suppress the alternator output to electrical load.
(Operated as a normal alternator)
Accelerator pedal position sen-
sor (2nd channel)1. Suspends lean burn operation.
2. Controls the throttle valve position by using signals from the accelerator pedal
position sensor (1st channel). (However, the control system is not applicable
if the difference from the accelerator pedal position sensor (1st channel) output
voltage is 1.0V or higher.)
3
. Suspends the electronic controlled throttle valve system if accelerator pedal
position sensor (1st channel) is also defective.


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GDI -Troubleshooting 13A-130
INSPECTION CHART FOR DIAGNOSIS CODES
Code No.Diagnosis itemReference page
11Oxygen sensor system13A-131
12Air flow sensor system13A-133
13Intake air temperature sensor system13A-135
14Throttle position sensor (2nd channel) system13A-137
21Engine coolant temperature sensor system13A-138
22Crank angle sensor system13A-140
23Camshaft position sensor system13A-142
24Vehicle speed sensor system13A-144
25Barometric pressure sensor system13A-145
31Detonation sensor system13A-146
41Injector system13A-147
44Ignition coil (incorporating power transistor) system (for No. 1 and No. 4 cylinders)13A-148
52Ignition coil (incorporating power transistor) system (for No. 2 and No. 5 cylinders)13A-148
53Ignition coil (incorporating power transistor) system (for No. 3 and No. 6 cylinders)13A-148
54Immobilizer system13A-150
56Abnormal fuel pressure system13A-151
64Alternator FR terminal system13A-153
77Accelerator pedal position sensor (2nd channel) system13A-154
78Accelerator pedal position sensor (1st channel) system13A-156
79Throttle position sensor (1st channel) system13A-158
89Abnormality in fuel pressure system13A-160
91Electronic-controlled throttle valve system13A-161
92Throttle valve position feedback system13A-162
93Throttle valve control servo system13A-163
94Communication line system with throttle valve controller13A-164
96Throttle valve controller system13A-165
NOTE
Code No. 56 may be also output when air is sucked in high-pressure fuel line due to no fuel supply.


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GDI -Troubleshooting 13A-148
OK
Use an analyzer to measure the
signal waveform at engine-A/T-ECU
connectors D-119 and D-120.
DEngine: Idling
DSelector lever position: P
DVoltage between terminal 1 and
earth
OK:
A normal waveform should
be displayed as described
on P.13A-214 (INSPEC-
TION PROCEDURE US-
ING AN ANALYZER).NGCheck the following connector:
B-61
OK
Check the following connectors:
B-117 , B-114 injector>, B-118 ,
B-115 , B-103 injector>, B-104 NG
RepairNG
OK
OK
Check the harness wire between the
injector and the intermediate
connector.NG
Replace the engine-A/T-ECU.
Repair
Repair
From the previouspage
OK
Check the harness wire between
injector and the intermediate
connector.NG
Repair
OK
Replace the injector.
Check the trouble symptoms.NGReplace the injector driver.
Code No.44, 52, 53 Ignition coil (incorporating power
transistor) systemProbable cause
Range of Check
DEngine speed is approx. 50 - 4,000 r/min.
DEngine is not cranking.
Set Conditions
DThe ignition failure sensor does not send a signal about a certain cylinder for
four seconds. However, except that the ignition failure sensor does not send
a signal about all of cylinders.DMalfunction of the ignition coil
DMalfunction of the ignition failure sensor
DMalfunction of sparkplug
DOpen or short circuit in the primary ignition circuit
or loose connector contact
DMalfunction of engine-A/T-ECU


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GDI -Troubleshooting 13A-149
OK
Check trouble symptom.
OK
Check trouble symptom.
OK
Check the following connectors:
B-101, B-108, B-112,
B-113, B-116, B-119
NG
Repair
OK
Replace the engine-A/T-ECU.
NGNG
Replace the ignition failure sensor.
OK
Check the harness wire between the engine-A/T-ECU and the igni-
tion failure sensor.
OK
Check the ignition failure sensor. (Refer to GROUP 16 - Ignition
System.)NG
Check the following connectors:
B-04, D-120
Check the ignition coil. (Refer to GROUP 16 - Ignition System.)NG
Replace
Measure at the 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) Voltage between 1 and earth (Ignition switch: ON)
OK:
System voltage
(2) Voltage between 3 and earth (Engine: cranking)
OK:
0.5 - 4.0 V
(3) Continuity between 2 and earth
OK:
ContinuityReplace
OK
NG
Repair
OK
Check the following connectors:
B-07, B-107, E-13, D-223
(1) NG
NGRepair
NG
Check and repair the harness wire between the ignition coil and
ignition failure sensor.
Check and repair the harness wire between the ignition failure
sensor and ignition switch.
Check the following connectors:
B-107, D-119
Repair
NG
(2) NG
OK
Check trouble symptom.
Check the harness wire between the engine-A/T-ECU and the igni-
tion coil.
Repair
NGOK
Replace the engine-A/T-ECU.
Check and repair the harness wire between the ignition coil and
earth. (3) NG
Measure at the ignition failure sensor connector B-04.
DDisconnect the connector, and measure at the harness
side.
(1) Voltage between 2 and earth (Ignition switch: ON)
OK:
4 V or more
(2) Continuity between 1 and earth
OK:
Continuity
NG
There is short circuit oropencircuit in the ignition signal output
harness of the ignition failure sensor. Check and repair the harness. (1) NG
Check and repair the harness wire between the ignition failure
sensor and earth. (2) NG
Measure at the engine-A/T-ECU connector D-120.
DConnect the connector.
DVoltage between 45 and earth (Engine: 3,000 r/min)
OK:
0.3 - 3.0 VOK
Repair
NG


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