engine MITSUBISHI MONTERO 2000 Service Repair Manual

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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GDI -Troubleshooting <A/T>13A-147
Code No.41 Injector systemProbable cause
Range of Check
DThe enginespeed is 4,000 r/min or less.
DThe battery voltage is 10 V or more.
DThe fuel cut operation or the injector operation (by carrying out the Actuator
Test) is not in progress.
Set Conditions
DThe injector driver is not transmitting a injectoropencircuit check signal for
four seconds.DMalfunction of injector
DOpen or short circuit in the injector circuit or loose
connector contact
DMalfunction of engine-A/T-ECU
NG
Check the following connector:
B-105NG
Repair
OK
NG
Repair
MUT-
IIActuator Test
01 No.1 injector
02 No.2 injector
03 No.3 injector
04 No.4 injector
05 No.5 injector
06 No.6 injector
OK:
The idling condition should
change.OKCheck the trouble symptoms.OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Replace the injector driver.
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
Measure at intermediate connector
B-105.
DDisconnect the connector and
measure at the harness side.
DResistance between terminals 11
and 12 <No.1 injector>
Resistance between terminals 5
and 6 <No.2 injector>
Resistance between terminals 9
and 10 <No.3 injector>
Resistance between terminals 3
and 4 <No.4 injector>
Resistance between terminals 7
and 8 <No.5 injector>
Resistance between terminals 1
and 2 <No.6 injector>
OK:
0.9 - 1.1WNGCheck the following connectors:
B-117 <No.1 injector>, B-114 <No.2
injector>, B-118 <No.3 injector>,
B-115 <No.4 injector>, B-103 <No.5
injector>, B-104 <No.6 injector>NG
Repair
OK
Replace the injector.
Check the following connector:
B-121NG
Repair
OK
Check the harness wire between the
injector driver and the intermediate
connector.NG
Repair
OK
Check the following connector:
D-119NG
Repair
OK
Check the harness wire between the
injector driver and the
engine-A/T-ECU.NG
Repair
OK
To the nextpage
Check the harness wire between
injector and the intermediate
connector.
OK


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GDI -Troubleshooting <A/T>13A-148
OK
Use an analyzer to measure the
signal waveform at engine-A/T-ECU
connectors D-119 and D-120.
DEngine: Idling
DSelector lever position: P
DVoltage between terminal 1 and
earth
OK:
A normal waveform should
be displayed as described
on P.13A-214 (INSPEC-
TION PROCEDURE US-
ING AN ANALYZER).NGCheck the following connector:
B-61
OK
Check the following connectors:
B-117 <No.1 injector>, B-114 <No.2
injector>, B-118 <No.3 injector>,
B-115 <No.4 injector>, B-103 <No.5
injector>, B-104 <No.6 injector>NG
RepairNG
OK
OK
Check the harness wire between the
injector and the intermediate
connector.NG
Replace the engine-A/T-ECU.
Repair
Repair
From the previouspage
OK
Check the harness wire between
injector and the intermediate
connector.NG
Repair
OK
Replace the injector.
Check the trouble symptoms.NGReplace the injector driver.
Code No.44, 52, 53 Ignition coil (incorporating power
transistor) systemProbable cause
Range of Check
DEngine speed is approx. 50 - 4,000 r/min.
DEngine is not cranking.
Set Conditions
DThe ignition failure sensor does not send a signal about a certain cylinder for
four seconds. However, except that the ignition failure sensor does not send
a signal about all of cylinders.DMalfunction of the ignition coil
DMalfunction of the ignition failure sensor
DMalfunction of sparkplug
DOpen or short circuit in the primary ignition circuit
or loose connector contact
DMalfunction of engine-A/T-ECU


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GDI -Troubleshooting <A/T>13A-149
OK
Check trouble symptom.
OK
Check trouble symptom.
OK
Check the following connectors:
B-101, B-108, B-112,
B-113, B-116, B-119
NG
Repair
OK
Replace the engine-A/T-ECU.
NGNG
Replace the ignition failure sensor.
OK
Check the harness wire between the engine-A/T-ECU and the igni-
tion failure sensor.
OK
Check the ignition failure sensor. (Refer to GROUP 16 - Ignition
System.)NG
Check the following connectors:
B-04, D-120
Check the ignition coil. (Refer to GROUP 16 - Ignition System.)NG
Replace
Measure at the ignition coil connectors B-101, B-108, B-112, B-113,
B-116, B-119.
DDisconnect the connector, and measure at the harness
side.
(1) Voltage between 1 and earth (Ignition switch: ON)
OK:
System voltage
(2) Voltage between 3 and earth (Engine: cranking)
OK:
0.5 - 4.0 V
(3) Continuity between 2 and earth
OK:
ContinuityReplace
OK
NG
Repair
OK
Check the following connectors:
B-07, B-107, E-13, D-223
<LHD> (1) NG
NGRepair
NG
Check and repair the harness wire between the ignition coil and
ignition failure sensor.
Check and repair the harness wire between the ignition failure
sensor and ignition switch.
Check the following connectors:
B-107, D-119
Repair
NG
(2) NG
OK
Check trouble symptom.
Check the harness wire between the engine-A/T-ECU and the igni-
tion coil.
Repair
NGOK
Replace the engine-A/T-ECU.
Check and repair the harness wire between the ignition coil and
earth. (3) NG
Measure at the ignition failure sensor connector B-04.
DDisconnect the connector, and measure at the harness
side.
(1) Voltage between 2 and earth (Ignition switch: ON)
OK:
4 V or more
(2) Continuity between 1 and earth
OK:
Continuity
NG
There is short circuit oropencircuit in the ignition signal output
harness of the ignition failure sensor. Check and repair the harness. (1) NG
Check and repair the harness wire between the ignition failure
sensor and earth. (2) NG
Measure at the engine-A/T-ECU connector D-120.
DConnect the connector.
DVoltage between 45 and earth (Engine: 3,000 r/min)
OK:
0.3 - 3.0 VOK
Repair
NG


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GDI -Troubleshooting <A/T>13A-150
Code No.54 Immobilizer systemProbable cause
Range of Check
DIgnition switch: ON
Set Conditions
DImproper communication between the engine-A/T-ECU and the
immobilizer-ECUDOpen or short circuit, or loose connector contact
DMalfunction of the immobilizer-ECU
DMalfunction of the engine-A/T-ECU
NOTE
(1) If the registered ignition keys are close each other when starting the engine, radio interference may
cause this code to be displayed.
(2) This code may be displayed when registering the key encrypted code.
NG
Replace the engine-A/T-ECU.
Check the trouble symptoms.
NG
Replace the immobilizer-ECU
OK
Check the trouble symptoms.
OK
Check the harness wire between the
immobilizer-ECU and the
engine-A/T-ECU, and repair if
necessary.NG
Replace
Check the following connectors:
D-122, D-202, E-13NG
Repair


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GDI -Troubleshooting <A/T>13A-151
Code No.56 Abnormal fuel pressureProbable cause
Range of Check
DIgnition switch: ON
Set Conditions
DThe sensor output voltage is 4.8V or more, or 0.2 V or less for four
seconds.DMalfunction of of fuel pressure sensor
DOpen or short circuit in the fuel pressure sensor
circuit or loose connector contact
DMalfunction of engine-A/T-ECU
Range of Check
DThe following conditions are detected temporarily after the engine has been
started.
(1) Engine speed: 1,000 r/min or more
(2) Fuel pressure: 2 MPa or more
DEngine running
Set Conditions
DThe fuel pressure is 6.9 MPa or more, or 2 MPa or less for four seconds.DMalfunction of high-pressure fuel pump
DClogging of high-pressure fuel lines
This diagnosis code will also be output when air is trapped into the
high-pressure fuel lines (such as poor fuel level). In that case, the air can be
evacuated by operating the engine for atleast 15 seconds at 2,000 r/min. After
the repair, use the MUT-IIto erase the diagnosis code.DAir trapped due to poor fuel level
(2) NGCheck the following connector:
D-121NG
Repair
OK
Check the harness wire between the
intermediate connector and the
engine-A/T-ECU, and repair if
necessary.
MUT-
IIData list
74 Fuel pressure 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-35NG
Repair
OK
Measure at intermediate connector
B-110.
DDisconnect the connector, and
measure at the engine-A/T-ECU
harness side.
(1) Voltage between terminal 4 and
earth (Ignition switch: ON)
OK:
4.8 - 5.2 V
(2) Resistance between terminal 6
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 wire between the
intermediate connector and the
engine-A/T-ECU.NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
To the nextpage
OK
Check the harness wire between the
intermediate connector and the
engine-A/T-ECU, and repair if
necessary.NG
Repair


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GDI -Troubleshooting <A/T>13A-152
NG
(2) NGCheck the following connector:
B - 111NG
Repair
OK
Measure 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
(1) Voltage between terminal 4 and
earth
OK:
4.8 - 5.2 V
(2) Voltage between terminal 5 and
earth
OK:
0.3 - 4.7 V
(3) Voltage between terminal 6 and
earth
OK:
0.5 V or less(1), (3) NGCheck the following connector:
B - 111
OK
Check the following connector:
D-121NG
Repair
OK
Check the harness wire between the
fuel pressure sensor and the
intermediate connector.NG
Repair
From the previouspage
OK
Check the harness wire between the
intermediate connector and the
engine-A/T-ECU, and repair if
necessary.
OK
Check the harness wire between the
fuel pressure sensor and the
intermediate connector.NG
Repair
OK
Replace the fuel pressure sensor.
Check the trouble symptoms.
Check the following connector:
D-121NG
Repair
NG
Check the harness wire between the
intermediate connector 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.
DEngine: Idling
DSelector lever position: P
DVoltage between terminal 93 and
earth
OK:
0.3 - 4.7 VNGCheck the following connector:
D-121NG
Repair
OK
Check the harness wire between the
intermediate connector and the
engine-A/T-ECU, and repair if
necessary.
OKCheck the following connector:
D-121NG
Repair
OK
Check the trouble symptoms.
OK
Replace the engine-A/T-ECU.OKRepair


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GDI -Troubleshooting <A/T>13A-153
Code No.64 Alternator FR terminal systemProbable cause
Range of Check
DEngine speed: 50 r/min or more
Set Conditions
DInput voltage from the alternator FR terminal is system voltage for 20
seconds.DOpen circuit in alternator FR terminal circuit
DMalfunction of engine-A/T-ECU
OK
Check the harness wire between the
intermediate connector and the
engine-A/T-ECU, and repair if
necessary.NG
Repair
NG
Check the following connector:
D-120NG
Repair
Check the following connector:
B-41NG
Repair
OK
Measure at intermediate connector
B-41.
DUse test harness (MB991658) to
connect the connector, and
measure at the pick-up harness.
DEngine:idling (After warming up)
DSelector lever position: P
DRadiator fan: Not operating
DThe voltage between terminal 2
and earth
OK:
The voltage drops when
the Headlamp are turned
on.NG
Check the following connector:
B-59NG
Repair
OK
Check the trouble symptoms.
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
Measure at intermediate connector
B-41.
DUse test harness (MB991658) to
connect the connector, and
measure at the pick-up harness.
DIgnition switch: ON
DThe voltage between terminal 2
and earth
OK:
9 - 10 VNGMeasure at engine-A/T-ECU
connector D-120.
DMeasure the voltage at the
engine-A/T-ECU terminal.
DIgnition switch: ON
DThe voltage between terminal 54
and earth
OK:
9 - 10 VNGCheck the following connector:
D-120
OK
NG
Repair
OK
Check the following connector:
D-120NG
Replace
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
Check the harness wire between the
intermediate connector and the
engine-A/T-ECU.NG
Repair
NG
Replace the alternator.OK
Check the trouble symptoms.OKIntermittent malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
Check the harness wire between the
alternator and the intermediate
connector.


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