sensor MITSUBISHI MONTERO 2000 Service Repair Manual

GDI -Troubleshooting <A/T>13A-156
Code No.78 Accelerator pedal position sensor (1st
channel) systemProbable cause
Range of Check
DAcceleratorpedal positionsensor (2nd channel) is normal.
DCommunication between the engine-A/T-ECU and the throttle valve controller
is normal.
Set Conditions
DThe output voltage of accelerator pedal positionsensor (1st channel) is 0.2 V
or less for one second.
or
DThe output voltage of accelerator pedal positionsensor (2nd channel) is 2.5
V or less, and that of acceleratorpedal positionsensor (1st channel) is 4.5
V or more for one second
or
DThe difference between accelerator pedal positionsensor (1st channel) and
accelerator pedal positionsensor (2nd channel) output voltages is 1.0 V or
more (i.e. the throttle opening anglechanges slightly).
or
DThe output voltage of accelerator pedal positionsensor (1st channel) is 1.1 V
or more for one second when the acceleratorpedal positionswitch is turned
on.DMalfunction of accelerator pedal positionsensor
(1st channel)
DOpen or short circuit in the acceleratorpedal
position sensor (1st channel) circuit or loose
connector contact
DAcceleratorpedal positionswitch seized ON
DMalfunction of throttle valve controller
DMalfunction of engine-A/T-ECU
OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU, and repair if necessary.
NG
Check Acceleratorpedal position
sensor (1st channel) (Refer to
P.13A-229).NG
Replace
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
(2) NGMeasure at engine-A/T-ECU
connector D-120.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DIgnition switch: ON
DVoltage between terminal 46 and
earth
OK:
4.8 - 5.2 VOK
OK
MUT-
IIData list
78 Acceleratorpedal positionsensor
(1st channel) (Refer to 13A-198,
DATA LIST REFERENCE
TABLE.)OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
MUT-
IIData list
26 Acceleratorpedal positionswitch
(Refer to 13A-198, DATA LIST
REFERENCE TABLE.)NGCheck the acceleratorpedal position
switch system. (Refer to P.13A-192,
Inspection Procedure 28).
OK
Measure at accelerator pedal position
sensor connector D-135.
DDisconnect the connector and
measure at the harness side.
(1) Resistance between terminal 1
and earth
OK:
2Wor less
(2) Voltage between terminal 2 and
earth
(Ignition switch: ON)
OK:
4.8 - 5.2 V(1) NGCheck the following connector:
D-120NGRepair
NG
Repair
NG
Check the following connector:
D-117NG
Repair
OK
Check the following connector:
D-45NG
Repair
OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU.NG
Repair
OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU.NG
RepairOK
To the nextpage
Check the following connector:
D-120


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GDI -Troubleshooting <A/T>13A-157
OK
Measure at accelerator pedal position
sensor connector D-135.
DConnect connector terminals
No.1, No.2 and No.3 only by
using test harness (MB991658),
and measure at the pick-up
harness.
DIgnition switch: ON
(1) Voltage between terminal 1 and
earth
OK:
0.5 V or less
(2) Voltage between terminal 2 and
earth
OK:
4.8 - 5.2 V
(3) Voltage between terminal 3 and
earth
OK:
Acceleratorpedalfully re-
leased: 0.985 - 1.085 V
Acceleratorpedalfully de-
pressed: 4.0 V or higher(1), (2) NGCheck the following connector:
D-32NG
Check the following connector:
D-31NG
Repair OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU, and repair if necessary.
From the previouspage
(3) NG
Adjust the acceleratorpedal position
sensor. (Refer to P.13A-221.)
OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU, and repair if necessary.
OK
Measure at engine-A/T-ECU
connector D-121.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DIgnition switch: ON
DVoltage between terminal 95 and
earth
OK:
Acceleratorpedalfully re-
leased: 0.985 - 1.085 V
Acceleratorpedalfully de-
pressed: 4.0 V or higherNGCheck the following connector:
D-121NGRepair
OK
Check the harness wire between
accelerator pedal positionsensor
(1st channel) and the engine-
A/T-ECU, and repair if necessary.
OKCheck the following connector:
D-121NG
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.Repair
Repair


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GDI -Troubleshooting <A/T>13A-158
Code No.79 Throttle position sensor (1st channel)
systemProbable cause
The throttle valve controller judges a malfunction, and then transmit the result to
the engine-A/T-ECU.
Range of Check
DIgnition switch: ON
Set Conditions
DThe sensor output voltage is 0.2 V or less.
or
DThe sensor output voltage is 4.85 V or more and the throttle position sensor
(2nd channel) output voltage is 2.5V or more.
or
DThe throttle position sensor (1st channel) and throttle position sensor (2nd
channel) combination output voltage is outside 4 - 6V.
or
DThe opening angle of throttle positionsensor (1st channel) is different from
its target by 1V or more.
or
DThe throttle position sensor (1st channel) output changes within 25 mV when
the throttle valve control servo moves one step.DMalfunction of throttle position sensor
DOpen or short circuit in the throttle position sensor
(1st channel) circuit or loose connector contact
DMalfunction of throttle valve controller
DMalfunction of engine-A/T-ECU
OK
Check the harness wire between the
the throttle position sensor and the
throttle valve controller, and repair if
necessary.
MUT-
IIData list
79 Throttle position sensor (1st
channel) (Refer to P.13A-198,
DATA LIST REFERENCE
TABLE.)OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Check the throttle position sensor.
(Refer to P.13A-228.)NG
Replace
OK
Measure at throttle position sensor
connector B-102.
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 3
and earth
OK:
2Wor less(1) NGMeasure at throttle valve controller
connector D-11.
DMeasure voltage at the throttle
valve controller connector
terminals.
DIgnition switch: ON
DVoltage between terminal 6 and
earth
OK:
4.8 - 5.2 VOKCheck the following connector:
D-11
NG
Repair
NG
Check the following connector:
D-11NG
Repair
OK
Check the trouble symptoms.NGReplace the throttle valve controller.
NG
Check the following connector:
B-102NG
Repair
(2) NGCheck the following connector:
D-11NGRepair
OK
Check the harness wire between the
the throttle position sensor and the
throttle valve controller.NG
Repair
OK
Check the harness wire between the
the throttle position sensor and the
throttle valve controller.NG
Repair
OK
Check the trouble symptoms.NGReplace the throttle valve controller.
OK
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GDI -Troubleshooting <A/T>13A-159
OK
Measure at throttle valve controller
connector D-11.
DMeasure voltage at the throttle
valve controller connector
terminals.
DIgnition switch: ON
DVoltage between terminal 7 and
earth
OK:
Acceleratorpedalfully re-
leased: 0.4 - 0.8 V
Acceleratorpedalfully de-
pressed: 4.2 - 4.8 VNGCheck the following connector:
D-11NG
Repair
OK
Check the harness wire between the
the throttle position sensor and the
throttle valve controller, and repair if
necessary.
OK
Check the following connector:
D-11
OK
Check the trouble symptoms.
NG
Replace the throttle valve controller.
From the previouspage
NG
Repair
OK
Measure at throttle position sensor
connector B-102.
DUse test harness (MB991536) to
connect the connector, 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:
Acceleratorpedalfully re-
leased: 0.4 - 0.8 V
Acceleratorpedalfully de-
pressed: 4.2 - 4.8 V
(3) Voltage between terminal 3 and
earth
OK:
0.5 V or less(1) NGCheck the following connector:
D-11NG
Repair
(3) NG
OK
Check the harness wire between the
the throttle position sensor and the
throttle valve controller, and repair if
necessary.
(2) NG
Adjust the throttle position sensor.
(Refer to P.13A-220.)
Check the following connector:
D-11NG
Repair
OK
Check the harness wire between the
the throttle position sensor and the
throttle valve controller, and repair if
necessary.


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GDI -Troubleshooting <A/T>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 <A/T>GDI -Troubleshooting <A/T>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 <A/T>13A-162
Code No.92 Throttle valve position feedback systemProbable cause
The throttle valve controller judges a malfunction, and then transmit the result to
the engine-A/T-ECU.
Range of Check
DIgnition switch: ON
DBattery voltage: 10 V or more
Set Conditions
DFailure in the position feedback
[The engine-A/T-ECU detects that the current in the motor isexcessive and
the opening angle difference between the targetvalue of throttle position
sensor (1st channel) and the actual value of throttle position sensor (1st
channel) is 2.0V or more]DMalfunction of throttle position sensor (1st channel)
DOpen or short circuit in the throttle position sensor
(1st channel) circuit or loose connector contact
DMalfunction of the throttle valve controller
NG
Replace the throttle valve controller.
OK
Check the trouble symptoms.
NG
Check the harness wires between the throttle position sensor
and the throttle valve controller, and between the throttle valve
control servo and the throttle valve controller.NG
Repair
NO
Adjust the throttle position sensor. (Refer to P.13A-220.)
MUT-
IISelf-Diag Code
Is code No.79 set?YESRefer to Code No.79, Throttle position sensor (1st channel)
system. (Refer to P.13A-158.)
NO
MUT-
IISelf-Diag Code
Is Code No.93 set?YESRefer to Code No.93, Throttle valve control servo system
(Refer to P.13A-163.)
OK
Check the following connectors:
B-102, B-122, D-11NG
Repair
OK
Check the throttle valve control servo. (Refer to 13A-232.)NGReplace the throttle body assembly.


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GDI -Troubleshooting <A/T>13A-170
Inspection procedure 3
The engine warning lamp does not illuminate right after
the ignition switch is turned to the ON position.
Probable cause
Because there is a burnt-out bulb, the engine-A/T-ECU causes theengine
warning lamp to illuminate forfive seconds immediately after the ignition switch
is turned to ON.
If the engine warning lampdoes notilluminate immediately after the ignition
switch is turned to ON, one of the malfunction listed at right has probably
occurred.DBurnt-out bulb
DOpen circuit or short-circuit between theengine
warning lamp and engine-A/T-ECU.
DMalfunction of the engine-A/T-ECU
NG
Replace the engine-A/T-ECU.
NG
Check the harness wire between
combination meter and
engine-A/T-ECU connector, and
repair if necessary.NG
Check theengine warning lamp
power supply circuit, and repair if
necessary.
OK
Check the trouble symptoms.
OK
Measure at the combination meter
connector D-01.
DDisconnect the connector, and
measure at the harness side.
DVoltage between 62 and earth
(Ignition switch: ON)
OK:
Battery voltageOKCheck the following connectors:
D-02, D-119, E-13NG
Repair
NG
Check a burnt-out bulb.NG
Replace
OK
Check the trouble symptoms.
OK
Measure at the engine-A/T-ECU
connector D-119.
DDisconnect the connector, and
measure at the harness side.
DEarth the terminal 22
(Ignition switch: ON)
OK:
Engine warning lamp illumi-
nates.OKCheck the following connector:
D-119NG
Repair
MUT-
IIData list
16 Engine-A/T-ECU power supply
voltage
(Refer to P.13A-198.)NGCheck the engine-A/T-ECU power
supply and earth circuit (Refer to
P.13A-189, Inspection procedure 24.)
Inspection procedure 4
The engine warning lamp remains illuminating and
never goes out.
Probable cause
In cases such as the above, the cause is probably that the engine-A/T-ECU is
detecting a problem in a sensor or actuator, or that one of the malfunctions
listed at right has occurred.DShort-circuit between the engine warning lamp and
engine-A/T-ECU
DMalfunction of the engine-A/T-ECU
Replace the engine-A/T-ECU.
NO
Measure at the combination connector D-02.
DDisconnect the connector, and measure at the harness
side.
DDisconnect the engine-A/T-ECU connector
DContinuity between 38 and earth
OK:
No continuityNGCheck the harness wire between combination meter and
engine-A/T-ECU connector, and repair if necessary.
OK
MUT-
IISelf-Diag Code
Is a diagnosis code set?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES.


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GDI -Troubleshooting <A/T>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 <A/T>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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