engine MITSUBISHI MONTERO 2000 Service Repair Manual

GDI -Troubleshooting <A/T>13A-134
OK
Check the harness between the air
flow sensor and the engine-A/T-ECU.NG
Repair
OK
Check the harnesses between the
air flow sensor and the
engine-A/T-ECU and between the air
flow sensor and theengine control
relay, 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: 3,000 r/min
6-9VNGCheck the following connector:
D-119NGRepair
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.
Check the trouble symptoms.
NG
Check the following connectors:
D-120, D-121, B-25XNG
Repair
OK
Measure the output waveform from
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
DSelector lever position: P
DVoltage between terminal 3 and
earth
OK:
Waveform should be dis-
played on P.13A - 211 (In-
spection Procedure Using
an Analyzer) and noise
should not be displayed in
the waveformNGReplace the air flow sensor.
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.OK


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GDI -Troubleshooting13A-135
Code No.13 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-A/T-ECU
OK
Check the harness between the air
flow sensor and the engine-A/T-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-227.)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-120NG
Repair
OK
Check the harness between the air
flow sensor and the engine-A/T-ECU.NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
Check following connector:
B-67NG
Repair
(2) NGMeasure at engine-A/T-ECU
connector D-120.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DDisconnect connector B-120.
DIgnition switch: ON
DVoltage between terminal 64 and
earth
OK:
4.8 - 5.2 VOKCheck the following connector:
D-120
OK
Check the harness between the air
flow sensor and the engine-A/T-ECU.NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
To the nextpage
Check the following connector:
D-121


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GDI -Troubleshooting <A/T>13A-136
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-120, D-121NG
Repair
OK
Check the harness between the air
flow sensor and the engine-A/T-ECU,
and repair if necessary.
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
From the previouspage


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GDI -Troubleshooting <A/T>13A-137
Code No.14 Throttle position sensor (2nd 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
DThe throttle position sensor (1st channel) is normal.
Set Conditions
DThe sensor output voltage is 0.2 V or less for four seconds.
or
DThe sensor output voltage is 4.85 V or more and the throttle position sensor
(1st channel) output voltage is 1.2 V or more for four seconds.
or
DThe throttle position sensor (1st channel) and throttle position sensor (2nd
channel) combination output voltage is outside 4 - 6 V.DMalfunction of throttle position sensor (2nd
channel)
DOpen or short circuit in the throttle position sensor
(2nd 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
14 Throttle position sensor (2nd
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
(2nd channel). (Refer to P.13A-228.)NG
Replace
OK
(1) NG
Measure 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
To the nextpage
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


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GDI -Troubleshooting <A/T>13A-138
OK
Measure at throttle valve controller
connector D-121.
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-121NG
Repair
OK
Check the harness wire between the
the throttle position sensor (2nd
channel) and the throttle valve
controller, and repair if necessary.
OK
Check the following connector:
D-121
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.
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 3 and
earth
OK:
0.5 V or less
(3) Voltage between terminal 4 and
earth
OK:
Acceleratorpedalfully re-
leased: 4.0 V or more
Acceleratorpedalfully de-
pressed: 0.4 - 0.6 V(1) NGCheck the following connector:
D-11NG
Repair
(2) NG
OK
Check the harness wire between the
the throttle position sensor (2nd
channel) and the throttle valve
controller, and repair if necessary.
(3) NG
Adjust the throttle position sensor.
(Refer to P.13A-220.)
Check the following connector:
D-121NG
Repair
OK
Check the harness wire between the
the throttle position sensor (2nd
channel) and the throttle valve
controller, and repair if necessary.
Code No.21 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-A/T-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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GDI -Troubleshooting <A/T>13A-139
OK
Check the harness wire between the
engine coolant temperaturesensor
and the engine-A/T-ECU.
MUT-
IIData list
21 Engine coolant temperature
sensor
OK:
When the engine iscold,
the temperature is roughly
the same asambient tem-
perature. If warm, it is 80 -
120_C.OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
NG
Replace
OK
Measure at engine coolant
temperature sensor connector B-56.
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 2
and earth
OK:
2Wor less(1) NGMeasure at engine-ECU connector
D-120.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DDisconnect connector B-56.
DIgnition switch: ON
DVoltage between terminal 44 and
earth
OK:
4.8 - 5.2 VOKCheck the following connector:
D-120
NG
Repair
NG
NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
Check the following connector:
B-56NG
Repair
(2) NG
OKRepair
OK
Check the harness wire between the
engine coolant temperaturesensor
and the engine-A/T-ECU.NG
Repair
NG
Check the harness wire between the
engine coolant temperaturesensor
and the engine-A/T-ECU.NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
To the nextpage
Measure at engine coolant
temperature sensor connector B-56.
DDisconnect the connector and
measure at the harness side.
DResistance between terminals 1
and 2
OK:
At 20_C of engine coolant
temperature: 2.1 - 2.7 kW
At 80_C of engine coolant
temperature: 0.26 - 0.36
kW
Check the following connector:
D-120
Check the following connector:
D-121


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GDI -Troubleshooting <A/T>13A-140
OK
Measure at engine coolant
temperature sensor connector B-56.
DUse test harness (MB991658) to
connect the connector, and
measure at the pick-up harness.
DIgnition switch: ON
DVoltage between terminal 1 and
earth
OK:
At 0_C of engine coolant
temperature: 3.2 - 3.8 V
At 20_C of engine coolant
temperature: 2.3 - 2.9 V
At 40_C of engine coolant
temperature: 1.3 - 1.9 V
At 80_C of engine coolant
temperature: 0.3 - 0.9 VNGCheck theengine coolant
temperature sensor.
(Refer to P.13A-227.)NG
Repair
OK
Check the harness wire between the
engine coolant temperaturesensor
and the engine-A/T-ECU, and repair
if necessary.
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
Check the following connectors:
D-120, D-121NG
Repair
From the previouspage
Code No.22 Crank angle sensor systemProbable cause
Range of Check
DEngine is cranking
Set Conditions
DSensor output voltage does not change for 4 seconds (no pulse signal input).DMalfunction of the crankanglesensor.
DOpen or short circuit in the crankanglesensor
circuit or loose connector contact.
DMalfunction of engine-A/T-ECU


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GDI -Troubleshooting <A/T>13A-141
OK
Check the harness wire between the
crankanglesensor and the
engine-A/T-ECU, and repair if
necessary.
MUT-
IIData list
22 Crankanglesensor (Refer to
P.13A-198, DATA LIST
REFERENCE TABLE.)OKIntermittent malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
OK
Measure at the crankanglesensor
connector B-52.
DDisconnect the connector and
measure at the harness side.
(1) The resistance between terminal
1 and earth
OK:
2Wor less
(2) The voltage between terminal 2
and earth
(Ignition switch: ON)
OK:
4.8 - 5.2 V
(3) The voltage between terminal 3
and earth
(Ignition switch: ON)
OK:
System voltage(1) NGCheck the harness between the
crankanglesensor and earth, and
repair if necessary.
NG
Repair
NG
Check the following connector:
D-120NG
Repair
NG
Check the following connector:
B-52NG
Repair
(2) NGMeasure at engine-A/T-ECU
connector D-120.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DDisconnect the connector B-52
DIgnition switch: ON
DThe voltage between terminal 45
and earth.
OK:
4.8 - 5.2 VOKCheck the following connector
:
D-120
Check the following connector:
B-25XNG
Repair
OK
Check the harness wire between the
crankanglesensor and the
engine-A/T-ECU.NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
(3) NG
OK
Check the harness wire between the
crankanglesensor and theengine
control relay, and repair if necessary.OK
Use an analyzer to measure the
output waveform at the crankangle
sensor connector B-52.
DUse the test harness
(MD998478) to connect the
connector, and measure at the
pickup harness side.
DEngine: Idling
DThe voltage between terminal 2
and earth
OK:
A normal waveform should
be displayed as described
on P.13A-212 (Inspection
Procedure Using an Ana-
lyzer). Its maximum value
should be 4.8 V or more,
and its minimumvalue
should be 0.6 V or less
with no noise in waveformNGCheck the crankanglesensor vaneNG
Replace
OK
Replace the crankanglesensor
OK
Check the trouble symptoms.
NG
NG
Repair
OK
Check the harness wires between
the crankanglesensor and the
engine-A/T-ECU, crankanglesensor
and the engine controlrelay, and the
crankanglesensor and earth. Then,
repair if necessary.
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.
Check the following connectors:
B-25X, D-120


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GDI -Troubleshooting <A/T>13A-142
Code No.23 Camshaft position sensor systemProbable cause
Range of Check
DAfter theengine wasstarted
Set Conditions
DThe sensor output voltage does not change for 4 seconds (no pulse signal
input).DMalfunction of the camshaft position sensor
DOpen or short circuit in the camshaft position
sensor circuit or loose connector contact.
DMalfunction of engine-A/T-ECU


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GDI -Troubleshooting <A/T>13A-143
OK
Check the harness wire between the
intermediate connector and the
engine-A/T-ECU, and repair if
necessary.NG
Repair
NG
NG
Repair
NG
Repair
(2) NGMeasure at engine-A/T-ECU
connector D-120.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DDisconnect connector B-110.
DIgnition switch: ON
DThe voltage between terminal 50
and earth
OK:
4.8 - 5.2 VOKCheck the following connector
:
D-120
Check the harness wire between the
intermediate connector and earth,
and repair if necessary.
OK
Check the harness wire between the
intermediate connector and the
engine controlrelay, and repair if
necessary.
(3) NG
OK
Measure at intermediate connector
B-110
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 2
and earth
(Ignition switch: ON)
OK:
4.8 - 5.2 V
(3) The resistance between terminal
3 and earth
OK:
2Wor less(1) NGCheck the following connector:
B-25XNG
Repair
OK
Replace the camshaft position
sensor
Check the trouble symptoms.
OK
NG
Repair
OK
Check the harness wires between the intermediate connector and the engine-A/T-ECU,
the intermediate connector and theengine controlrelay, and the intermediate connector
and earth. Then, repair if necessary.
NG
Replace the engine-A/T-ECU.
OK
Check the harness wire between the
intermediate connector and the
engine-A/T-ECU.NG
Repair
OK
Use an analyzer to measure the
output waveform at intermediate
connector B-110.
DUse test harness (MB991658) to
connect the connector, and
measure at the pick-up harness.
DEngine: Idling
DSelector lever position: P
DThe voltage between terminal 2
and earth
OK:
A normal waveform should
be displayed as described
on P.13A-212 (Inspection
Procedure Using an Ana-
lyzer), its maximum value
should be 4.8 V or more,
and its minimumvalue
should be 0.6 V or less
with no noise in waveform.(1) NGCheck the following connector:
B-23NG
Repair
OK
Check the harness wire between the
camshaft position sensor and the
intermediate connector.NG
Repair
NG
Check the camshaft position sensing
cylinderNG
OK
Check the trouble symptoms.Intermittent malfunction
(Refer to GROUP 00 - Points to Note for Intermittent Malfunctions.)
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
Replace
OK
Check the following connector:
B-110
Check the following connector:
D-120
Check the following connectors:
B-25X, D-120


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