MITSUBISHI MONTERO 2000 Service Repair Manual

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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GDI -Troubleshooting <A/T>13A-144
Code No.24 Vehicle speed sensor systemProbable cause
Range of Check
DEngine: Two seconds after theengine wasstarted
DIdle switch: OFF
DEngine speed: 2,500 r/min or more
DDuring high engine load
Set Conditions
DThe sensor output voltage does not change for 4 seconds (no pulse signal
input).DMalfunction of the vehicle speed sensor
DOpen or short circuit in the vehicle speed sensor
circuit or loose connector contact
DMalfunction of engine-A/T-ECU
NOCheck the vehicle speed sensor
(Refer to GROUP 54 - Combination Meter.)
YES
Use an analyzer to measure the output waveform of the
vehicle speed sensor at engine-A/T-ECU connector C-09.
DDriving the vehicle
DSelector lever position: P
DThe voltage between terminal 80 and earth
OK:
A normal waveform should be displayed as described
in OSCILLOSCOPE INSPECTION PROCEDURE,
and noise should not be displayed in the waveform.
(Refer to GROUP 23 - Troubleshooting.)NGCheck the following connectors:
C-09, E-13
NG
Repair
OK
Check the harness wire between intermediate connector E-13
and the engine-A/T-ECU, and repair if necessary.
OK
Check the following connector:
C-09NG
Repair
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.
Does the speedometer operate normally?


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GDI -Troubleshooting <A/T>13A-145
Code No.25 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-A/T-ECU
(2) NGCheck the following connector:
D-121NG
Repair
OK
Check the harness between the air
flow sensor and the engine-A/T-ECU,
and repair if necessary.
MUT-
IIData list
25 Barometric pressure sensor
(Refer to P.13A-198, 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-A/T-ECU
connector D-121.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DIgnition switch: ON
DVoltage between terminal 87 and
earth
OK:
4.8 - 5.2 VOKCheck the following connector:
D-121
NG
Repair
NG
Check the following connector:
D-121NG
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
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-121NG
Repair
OK
Check the harness between the air
flow sensor and the engine-A/T-ECU,
and repair if necessary.
OK
To the nextpage(3) NG
(2) NG
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,
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.
Check the following connector:
B-120
Check the trouble symptoms.


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GDI -Troubleshooting <A/T>GDI -Troubleshooting <A/T>13A-146
OK
Check the harness between the air
flow sensor and the engine-A/T-ECU,
and repair if necessary.
From the previouspage
OK
Measure at engine-A/T-ECU
connector D-120.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DIgnition switch: ON
DVoltage between terminal 55 and
earth
OK:
Altitude 0 m: 3.7 - 4.3 V
Altitude 1200 m:
3.2 - 3.8 VNGCheck the following connector:
D-120NGRepair
OK
Check the trouble symptoms.
OKCheck the following connector:
D-120NG
Repair
NG
Replace the engine-A/T-ECU.
Code No.31 Detonation sensor systemProbable cause
Range of Check
DEngine: Two seconds after theengine has beenstarted
Set Conditions
DChanges in sensor output voltage (detonation sensor peak voltage per 1/3
crankshaft rotation) in 200 consecutivecycles are0.08 V or less.DMalfunction of the detonation sensor
DOpen or short circuit in the detonation sensor
circuit or loose connector contact
DMalfunction of engine-A/T-ECU
Check the following connector:
B-05NG
Repair
OK
Measure at the detonation sensor connector B-05.
DDisconnect the connector and measure at the harness
side.
DThe resistance between terminal 2 and earth
OK:
2Wor lessNGCheck the harness wire between the detonation sensor and
earth, and repair if necessary.
OK
Check the following connector:
D-121NG
Repair
OK
Check the harness wire between the detonation sensor and
the engine-A/T-ECU.NG
Repair
OK
Check the trouble symptoms.OKIntermittent malfunction
(Refer to GROUP 00 - Points to Note for Intermittent
Malfunctions.)
NG
Replace the detonation sensor.
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.


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