sensor MITSUBISHI MONTERO 2000 Service User Guide
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Page 227 of 1839
GDI -Troubleshooting
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 standard petrol.
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 1.0 V or higher.)
3
. Suspends the electronic controlled throttle valve system if accelerator pedal
position sensor (1st channel) is also defective.
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Page 228 of 1839
GDI -Troubleshooting
Malfunctioning item Control contents during malfunction
Accelerator pedal position sen-
sor (1st channel)1. Suspends lean burn operation.
2. Controls the throttle valve position by using signals from the accelerator pedal
position sensor (2nd channel). (However, this control is not applicable if the
voltage difference between the accelerator pedal position sensor (1st channel)
and accelerator pedal position sensor (2nd channel) is 1.0 V or higher.)
3. Also suspends the electronic-controlled throttle valve system when the
accelerator pedal position sensor (2nd channel) is defective.
Throttle position sensor (1st
channel)1. Suspends lean burn operation.
2.Controls throttle opening angle feedback by using signals from throttle position
sensor (2nd channel). (However, the controlling system is not applied when
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 when throttle
position sensor (2nd channel) is also defective.
Electronic-controlled throttle
valve system1. Suspends the electronic controlled throttle valve system.
2. Suspends lean burn operation.
3. Suspends the idle speed feedback control.
Throttle valve position feed-
back1. Suspends the electronic controlled throttle valve system.
2. Suspends lean burn operation.
3. Suspends the engine speed feedback control.
However, if the throttle valve opening angle is significantly wide, this system carries
out the following controls.
1. Always cuts the fuel supply to three cylinders.
2. Cuts the fuel supply when the engine speed reaches 3,000 r/min or more.
Throttle control servo1. Suspends the electronic-controlled throttle valve system.
2. Suspends lean burn operation.
3. Suspends the engine speed feedback control.
Communication line between
the throttle valve controller and
the ECU1. Communication error between the throttle valve controller and the engine-ECU:
DSuspends lean burn operation.
DCuts the fuel supply when the engine speed reaches 3,000 r/min or
more.
DSuspends the cruise-control.
2. Communication error between the throttle valve controller and the engine-ECU:
DSuspends lean burn operation.
DCuts the fuel supply when the engine speed reaches 3,000 r/min or
more.
DSuspends the cruise-control.
DThe throttle valve controller controls the throttle valve opening angle by
using signals from accelerator pedal position sensor (2nd channel).
Throttle valve controller1. Suspends the electronic-controlled throttle valve system.
2. Suspends lean burn operation.
3. Suspends the engine speed feedback control.
NOTE
If the electronic-controlled throttle valve system is suspended, the engine warning lamp will illuminate.
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Page 229 of 1839
GDI -Troubleshooting
INSPECTION CHART FOR DIAGNOSIS CODES
Code No.Diagnosis itemReference page
P0100Air flow sensor system13A-17
P0105Barometric pressure sensor system13A-19
P0110Intake air temperature sensor system13A-21
P0115Engine coolant temperature sensor system13A-22
P0120LThrottle position sensor (1st channel) system13A-25
P0125Feedback system13A-27
P0130Oxygen sensor (front) system
P0135Oxygen sensor heater (front) system
P0136Oxygen sensor (rear) system
P0141Oxygen sensor heater (rear) system
P0170Abnormal fuel system13A-34
P0190LAbnormal fuel pressure13A-36
P0201No.1 injector system13A-38
P0202No.2 injector system13A-40
P0203No.3 injector system13A-42
P0204No.4 injector system13A-44
P0205No.5 injector system13A-46
P0206No.6 injector system13A-48
P0220LAccelerator pedal position sensor (1st channel) system13A-50
P0225LThrottle position sensor (2nd channel) system13A-52
P0300LIgnition coil (power transistor) system13A-53
P0301No.1 cylinder misfire detected.13A-55
P0302No.2 cylinder misfire detected.13A-55
P0303No.3 cylinder misfire detected.13A-55
P0304No.4 cylinder misfire detected.13A-55
P0305No.5 cylinder misfire detected.13A-55
P0306No.6 cylinder misfire detected.13A-55
P0325Detonation sensor system13A-56
P0335Crank angle sensor system13A-56
P0340Camshaft position sensor system13A-58
P0403EGR valve system13A-60
P0420Catalyst malfunction13A-61
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GDI -Troubleshooting
Code No.Reference page Diagnosis item
P0443Purge control solenoid valve system13A-62
P0500Vehicle speed sensor system13A-63
P1200Injector driver system13A-63
P1220LElectronic-controlled throttle valve system13A-64
P1221LThrottle valve position feedback system13A-65
P1222LThrottle control servo system13A-66
P1223LCommunication line with throttle valve controller13A-67
P1225LAccelerator pedal position sensor (2nd channel) system13A-68
P1226LThrottle valve controller system13A-69
P1500Alternator FR terminal system13A-70
P1610Immobilizer system13A-71
NOTE
1. Do not replace the engine-ECU until a through terminal check reveals there are no short/open circuit.
2. Check that the engine-ECU earth circuit is normal before checking for the cause of the problem.
3. After the engine-ECU has detected a malfunction, a diagnosis code is recorded the next time the
engine is started and the same malfunction is re-detected. However, for items marked with a “
L”,
the diagnosis code is recorded on the first detection of the malfunction.
4. Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates
the sensor mounted at the position second closest to the engine.
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Page 231 of 1839
GDI -Troubleshooting
INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSIS CODE
Code No.P0100 Air flow sensor systemProbable cause
Range of Check
DEngine speed: 500 r/min or more
Set Conditions
DThe sensor output frequency is 3.3 Hz or less for four seconds.DMalfunction of air flow sensor
DOpen or short circuit in air flow sensor circuit or
loose connector contact
DMalfunction of engine-ECU
(3) NGCheck the following connector:
D-118NG
Repair
(2) NGCheck the following connector:
B-25XNG
Repair
OK
Check the harness between the air
flow sensor and the engine-ECU,
and repair if necessary.
MUT-
IIData list
12 Air flow sensor (Refer to
P.13A-105, DATA LIST
REFERENCE TABLE.)OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Check the following connector:
B-120NG
Repair
OK
Measure at air flow sensor connector
B-120.
DDisconnect the connector and
measure at the harness side.
(1) Voltage between terminal 3 and
earth (Ignition switch: ON)
OK:
4.8 - 5.2 V
(2) Voltage between terminal 4 and
earth (Ignition switch: ON)
OK:
System voltage
(3) Resistance between terminal 5
and earth
OK:
2Wor less(1) NGMeasure at engine-ECU connector
D-117.
DMeasure the voltage at the
engine-ECU terminal.
DIgnition switch: ON
DVoltage between terminal 61 and
earth
OK:
4.8 - 5.2 VOKCheck the following connector:
D-117
NG
Repair
OK
Replace the air flow sensor.
NG
Check the following connector:
D-117NG
Repair
OK
Check the harness between the air
flow sensor and the engine-ECU.NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-ECU.
OK
Check the harness between the air
flow sensor and theengine control
relay, and repair if necessary.
OK
Check the harness between the air
flow sensor and the engine-ECU.NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-ECU.
OK
Measure at air flow sensor connector
B-120.
DUse test harness (MB991709) to
connect the connector, and
measure at the pick-up harness.
DIgnition switch: ON
DVoltage between terminal 7 and
earth
OK:
7-8VNGCheck the following connector:
D-118NG
Repair
OK
Check the harness between the air
flow sensor and the engine-ECU.NG
Repair
OK
To the nextpage
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Page 232 of 1839
GDI -Troubleshooting
OK
Check the harness between the air
flow sensor and the engine-ECU.NG
Repair
OK
Check the harnesses between the
air flow sensor and the engine-ECU
and between the air flow sensor and
the engine controlrelay, and repair if
necessary.
From the previouspage
OK
Measure at air flow sensor connector
B-120.
DUse test harness (MB991709) to
connect the connector, and
measure at the pick-up harness.
DSelector lever position: P
DVoltage between terminal 7 and
earth
OK:
Engine: Idling
0-1V
Engine speed: 3000 r/min
6-9VNGCheck the following connector:
D-118NGRepair
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.
Check the trouble symptoms.
NG
Check the following connectors:
B-25X, D-117, D-118NG
Repair
OK
Measure the output wave form at air
flow sensor connector B-120 (by
using an analyzer).
DUse test harness (MB991709) to
connect the connector, and
measure at the pick-up harness.
DEngine: Idling
DVoltage between terminal 3 and
earth
OK:
Waveforms should be dis-
played on P.13A-118 (In-
spection Procedure Using
an Analyzer) and noise
should not be displayed in
the waveform.NGReplace the air flow sensor.
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.OK
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GDI -Troubleshooting
Code No.P0105 Barometric pressure sensor systemProbable cause
Range of Check
DTwo seconds have passed since the ignition switch is turned ON or the
engine startingprocess is completed.
DBattery voltage: 8 V or more
Set Conditions
DThe sensor output voltage is 4.5 V or more for four seconds (equivalent to
114 kPa of barometric pressure)
or
DThe sensor output voltage is 0.2 V or less (equivalent to 53 kPa of
barometric pressure)DMalfunction of barometric pressure sensor
DOpen or short circuit in barometric pressure
sensor circuit or loose connector contact
DMalfunction of engine-ECU
(2) NGCheck the following connector:
D-117NG
Repair
OK
Check the harness between the air
flow sensor and the engine-ECU,
and repair if necessary.
MUT-
IIData list
25 Barometric pressure sensor
(Refer to P.13A-105, DATA LIST
REFERENCE TABLE.)OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
NG
Repair
OK
Measure at air flow sensor connector
B-120.
DDisconnect the connector and
measure at the harness side.
(1) Voltage between terminal 1 and
earth (Ignition switch: ON)
OK:
4.8 - 5.2 V
(2) Resistance between terminal 5
and earth
OK:
2Wor less(1) NGMeasure at engine-ECU connector
D-117.
DMeasure the voltage at the
engine-ECU terminal.
DIgnition switch: ON
DVoltage between terminal 41 and
earth
OK:
4.8 - 5.2 VOKCheck the following connector:
D-117
NG
Repair
NG
Check the following connector:
D-117NG
Repair
OK
Check the harness between the air
flow sensor and the engine-ECU.NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-ECU.
OK
Measure at air flow sensor connector
B-120.
DConnect connector terminals
No.1, No.2 and No.5 only by
using test harness (MB991709),
and measure at the pick-up
harness.
DIgnition switch: ON
(1) Voltage between terminal 1 and
earth
OK:
4.8 - 5.2 V
(2) Voltage between terminal 2 and
earth
OK:
Altitude 0 m: 3.7 - 4.3 V
Altitude 1200 m:
3.2 - 3.8 V
(3) Voltage between terminal 5 and
earth
OK:
0.5 V or less(1) NGCheck the following connector:
D-117NG
Repair
OK
Check the harness between the air
flow sensor and the engine-ECU,
and repair if necessary.
OK
To the nextpage(3) NG
(2) NG
Replace the air flow sensor.
NG
Check the following connector:
D-117NG
Repair
OK
Check the harness between the air
flow sensor and the engine-ECU,
and repair if necessary.
OK
Check the harness between the air
flow sensor and the engine-ECU.NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-ECU.
Check the following connector:
B-120
Check the trouble symptoms.
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GDI -Troubleshooting
OK
Check the harness between the air
flow sensor and the engine-ECU,
and repair if necessary.
From the previouspage
OK
Measure at engine-ECU connector
D-117.
DMeasure the voltage at the
engine-ECU terminal.
DIgnition switch: ON
DVoltage between terminal 51 and
earth
OK:
Altitude 0 m: 3.7 - 4.3 V
Altitude 1200 m:
3.2 - 3.8 VNGCheck the following connector:
D-117NGRepair
OK
Check the trouble symptoms.
OKCheck the following connector:
D-117NG
Repair
NG
Replace the engine-ECU.
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GDI -Troubleshooting
Code No.P0110 Intake air temperature sensor systemProbable cause
Range of Check
DTwo seconds have passed since the ignition switch is turned ON or the
engine startingprocess is completed.
Set Conditions
DThe sensor output voltage is 4.6 V or more for four seconds (equivalent to
-45_C of intake air temperature)
or
DThe sensor output voltage is 0.2 V or more for four seconds (equivalent to
125_C of intake air temperature)DMalfunction of intake air temperature sensor
DOpen or short circuit in intake air temperature
sensor or loose connector contact
DMalfunction of engine-ECU
OK
Check the harness between the air
flow sensor and the engine-ECU,
and repair if necessary.
MUT-
IIData list
13 Intake air temperature sensor
OK:
Roughly the same as ambi-
ent temperature.OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Check the intake air temperature
sensor itself.
(Refer to P.13A-1227.)NG
Repair
OK
Measure at air flow sensor connector
B-120.
DDisconnect the connector and
measure at the harness side.
(1) Resistance between terminal 5
and earth
OK:
2Wor less
(2) Voltage between terminal 6 and
earth
(Ignition switch: ON)
OK:
4.8 - 5.2 V(1) NG
NGRepair
NG
Repair
NG
Check the following connector:
D-117NG
Repair
OK
Check the harness between the air
flow sensor and the engine-ECU.NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-ECU.
OK
Check following connector:
B-120NG
Repair
(2) NGMeasure at engine-ECU connector
D-117.
DMeasure the voltage at the
engine-ECU terminal.
DDisconnect connector B-120.
DIgnition switch: ON
DVoltage between terminal 62 and
earth
OK:
4.8 - 5.2 VOKCheck the following connector:
D-117
OK
Check the harness between the air
flow sensor and the engine-ECU.NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-ECU.
OK
To the nextpage
Check the following connector:
D-118
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GDI -Troubleshooting
OK
Measure at air flow sensor connector
B-120.
DUse the test harness (MB991709)
to connect only terminals 5 and
6, and then measure at the
pickup harness.
DIgnition switch: ON
DVoltage between terminal 6 and
earth
OK:
Ambient temperature 0_C:
3.2 - 3.8 V
Ambient temperature 20_C:
2.3 - 2.9 V
Ambient temperature 40_C:
1.5 - 2.1 V
Ambient temperature 80_C:
0.4 - 1.0 VNGCheck the following connectors:
D-117, D-118NG
Repair
OK
Check the harness between the air
flow sensor and the engine-ECU,
and repair if necessary.
OK
Check the trouble symptoms.NGReplace the engine-ECU.
From the previouspage
Code No.P0115 Engine coolant temperature sensor
systemProbable cause
Range of Check
DEngine: Two seconds after theengine has beenstarted
Set Conditions
DThe sensor output voltage is 4.6 V or more for four seconds (equivalent to
-45_C of engine coolant temperature)
or
DThe sensor output voltage is 0.1 V or less for four seconds (equivalent to
140_C of engine coolant temperature)DMalfunction of engine coolant temperaturesensor
DOpen or short circuit in theengine coolant
temperature sensor circuit or loose connector
contact
DMalfunction of engine-ECU
Range of Check
DEngine: After starting
Set Conditions
DThe engine coolant temperature has reduced fromover 40_C to less than
40_C, and that condition has lasted for five minutes or more.
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