2000 MITSUBISHI MONTERO Service Repair Manual

GDI -Troubleshooting 13A-131
INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSIS CODE
Code No.11 Oxygen sensor systemProbable cause
Range of Check
DThree minutes havebeenpassed since theengine has been started.
DThe engine coolant temperature is approx. 80_C or more.
DIntake air temperature is 20 - 30_C
DEngine speed is 1,200 r/min or more
DDriving on a level surface at constant speed.
Set Conditions
DThe oxygen sensor output voltage is 4.5 V or more when the sensor output
voltage is 0.2 V or less and a voltage of 5 V isapplied to theoxygen
sensor inside the engine-A/T-ECU.DMalfunction of oxygen sensor
DOpen or short circuit in the oxygen sensor circuit
or loose connector contact
DMalfunction of engine-A/T-ECU


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GDI -Troubleshooting 13A-132
Repair
OK
Measure at oxygen sensor (front)
connector C-20.
DDisconnect the connector and
measure at the harness side.
DResistance between terminal 2
and earth
OK:
2Wor lessNGCheck the following connectors:
D-121, E-116NG
OK
Check the trouble symptoms.
Check the following connector:
C-20NG
Repair
(2) NGCheck the oxygen sensor. (Refer to
P.13A-230.)NGReplace
OK
Check the harness wire between
between the oxygen sensor and the
engine-A/T-ECU.NG
Repair
NG
Replace the engine-A/T-ECU.
Repair
OK
Measure at oxygen sensor connector
C-20.
DUse the test harness
(MD998464) to connect the
connector, and measure at the
pick-up harness side.
DEngine: 2,500r/min (after warming
up)
DSelector lever position: P
(1) Voltage between terminal 2 and
earth
OK:
0.5 V or less
(2) Voltage between terminal 4 and
earth
OK:
0 V and 0.8 V alternate.(1) NGCheck the following connectors:
D-121, E-116NG
OK
Check the harness wire between the
oxygen sensor and the
engine-A/T-ECU, and repair if
necessary.
OK
NG
Repair
OK
Check the harness wire between the
oxygen sensor and the
engine-A/T-ECU, and repair if
necessary.
OK
NG
Check the following connectors:
D-121, E-116NG
OK
Check the harness wire between the
oxygen sensor and the
engine-A/T-ECU, and repair if
necessary.
OK
Check the following connectors:
D-121, E-116
OKRepairNG
Check the trouble symptoms.OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Replace the engine-ECU.
Repair
Check the following connectors:
D-121, E-116
Measure at engine-A/T-ECU
connector D-121.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DEngine: 2,500r/min (after warming
up)
DSelector lever position: P
DVoltage between terminal 72 and
earth
OK:
0V and 0.8 V alternate.


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GDI -Troubleshooting 13A-133
Code No.12 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-A/T-ECU
(3) NGCheck the following connector:
D-121NG
Repair
(2) NGCheck the following connector:
B-25XNG
Repair
OK
Check the harness between the air
flow sensor and the engine-A/T-ECU,
and repair if necessary.
MUT-
IIData list
12 Air flow sensor (Refer to
13A-198, 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-A/T-ECU
connector D-120.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DIgnition switch: ON
DVoltage between terminal 65 and
earth
OK:
4.8 - 5.2 VOKCheck the following connector:
D-120
NG
Repair
OK
Replace the air flow sensor.
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 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-A/T-ECU.NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-A/T-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-119NG
Repair
OK
Check the harness between the air
flow sensor and the engine-A/T-ECU.NG
Repair
OK
To the nextpage


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GDI -Troubleshooting 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 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 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 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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