2000 MITSUBISHI MONTERO check engine
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DIESEL FUEL <4M4> -Troubleshooting13C-18
Code No. 27 Accelerator pedal position sensor (sub)
systemProbable cause
Range of Check
DIgnition switch: ON, acceleratorpedal positionsensor (main) operative, except
for during enginecranking
Set Conditions
DOutput voltage of accelerator pedal positionsensor (main) for 1 second is
0.2V or higher and lower than 2.5V. Output voltage of acceleratorpedal
position sensor (sub) for 1 second is 4.5V or higher, or lower than 0.2V.
Range of Check
DIgnition switch: ON, except for duringenginecranking
Set Conditions
DOutput voltage of accelerator pedal positionsensor (main, sub) for 1 second
is 0.2 V or higher or lower than 4.5V. The difference in the output sensor
voltage between the main and the subsensor is 1V or higher, or theidle
switch ON, and sensormain output voltage is 1.875V or higher.DAcceleratorpedal positionsensor inoperative
DAcceleratorpedal positionsensoropencircuit,
short circuit, or connector contact inoperative
DEngine-ECU inoperative
OK
Measure at D-135 acceleratorpedal position
sensor connector
DDisconnect the connector and measure at
the harness side.
DVoltage between 8 and the earth
(Ignition switch: ON)
OK:
4.5 - 5.5 V
DContinuity between 7 and the earth
OK:
ContinuityNGNG
Repair
OK
OKRepair
NGAcceleratorpedal positionsensor check
(Refer to P.13C-43.)
NG
Replace the engine-ECU.OKNG
OK
Replace
NG
Check the trouble symptoms.
NG
RepairCheck the following connector:
D-135
Check the harness between the
engine-ECU and the accelerator pedal
position sensor connector.
Check the trouble symptoms.
Replace the engine-ECU.
Check the following connector:
D-112
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Page 510 of 1839
DIESEL FUEL <4M4> -Troubleshooting13C-19
Code No. 41 Main throttle solenoid valve systemProbable cause
Range of Check
DEngine speed is 1600 r/min or higher and the accelerationopening degree is
60% or more.
Set Conditions
DBoost pressure is lower than barometric pressure + 30 kPa for two seconds.
Range of Check
DWith the idlingspeed controlled, theengine warmed up, and no failure found
Set Conditions
DBoost pressure is higher than barometric pressure - 2.7 kPa for 3 seconds.DMain throttle solenoidvalve inoperative
DMain throttle solenoidvalveopencircuit, short
circuit, or connector contact inoperative
DEngine-ECU inoperative
OK
Check the following connector:
B-45NG
Repair
OK
OK
Check and repair the harness between the
control relay and the solenoid valve
connector.
Main throttle solenoidvalve check (Refer to
P.13C-48.)
Check the trouble symptoms.
Replace the engine-ECU.
NG
OK
RepairCheck the following connector:
D-110
Check the trouble symptoms.NGReplace
NG NG
Check the following connectors:
B-45, B-45-2NG
Repair
OK
Check and repair the harness between the
control relay and the solenoid valve
connector.
Check the trouble symptoms.
NG
NGMeasure at D-110 engine-ECU connector
DDisconnect the connector and measure at
the harness side.
DVoltage between 14 and the earth
(Ignition switch: ON)
OK:
System voltageOK
Measure at B-45-2 main throttle solenoid
valve connector
DDisconnect the connector and measure at
the harness side.
DVoltage between 1 and the earth
(Ignition switch: ON)
OK:
System voltage
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Page 511 of 1839
DIESEL FUEL <4M4> -Troubleshooting13C-20
Code No. 43 Timing control valve systemProbable cause
Range of Check
DEngine coolant temperature 80_C or higher and the engine running
Set Conditions
DTarget value minus actual value is 1 V or more.DTiming controlvalve inoperative
DTiming controlvalveopencircuit, short circuit, or
connector contact inoperative
DEngine-ECU inoperative
OK
OK
Check and repair the harness between the
control relay and the injectionpump
assembly connector.
Timing controlvalve check (Refer to
P.13C-40.)
Replace the engine-ECU. OK
RepairCheck the following connector:
D-110
Check the trouble symptoms.NG NG NG
Check the following connector:
B-38NG
Repair
OK
Check the trouble symptoms.
NG
NGMeasure at D-110 engine-ECU connector.
DDisconnect the connector and measure at
the harness side.
DVoltage between 3 and the earth
(Ignition switch: ON)
OK:
System voltageOK
Measure at B-38 injectionpumpassembly
connector.
DDisconnect the connector and measure at
the harness side.
DVoltage between 5 and the earth
(Ignition switch: ON)
OK:
System voltage
Replace injection pumpassembly.
Check and repair the harness between the
engine-ECU and the injection pump
assembly connector.
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Page 512 of 1839
DIESEL FUEL <4M4> -Troubleshooting13C-21
Code No. 46 Injection correction ROM systemProbable cause
Range of Check
DIgnition switch: ON
Set Conditions
DWhen communication failsDInjection correction ROM inoperative
DEngine-ECU inoperative
Repair
OK
Replace the engine-ECU. OK
RepairCheck the following connector:
B-37
Check the trouble symptoms.NG NG
Check the following connectors:
D-112, D-113
NG
Repair
OK
Check the trouble symptoms.
NG
Measure at B-37 injection correction ROM
connector.
DDisconnect the connector and measure at
the harness side.
DVoltage between 3 and the earth
(Ignition switch: ON)
OK:
4.5 - 5.5 V
DContinuity between 2 and the earth
OK:
Continuity
Check and repair the harness between the
engine-ECU and the injection correction
ROM connector.
OK
Replace the engine-ECU.NG
Code No. 48 GE actuator (in the middle of control sleeve
position sensor inoperative) systemProbable cause
Range of Check
DIgnition switch: ON
Set Conditions
DTarget value minus actual value is 1 V or more.DControl sleeve position sensor inoperative
DGE actuator inoperative
DControl sleeve position sensoropencircuit, short
circuit, or connector contact inoperative
DEngine-ECU inoperative
OK
OK
Check and repair the harness between the
control relay and the injectionpump
assembly connector.
GE actuator check (Refer to P.13C-46.)
Replace the engine-ECU. OK
RepairCheck the following connector:
D-110
Check the trouble symptoms.NGNG NG
Check the following connector:
B-38NG
Repair
OK
Check the trouble symptoms.
NG
NGMeasure at D-110 engine-ECU connector
DDisconnect the connector and measure at
the harness side.
DVoltage between 1 and the earth
(Ignition switch: ON)
OK:
System voltageOK
Measure at B-38 injectionpumpassembly
connector.
DDisconnect the connector and measure at
the harness side.
DVoltage between 6 and the earth
(Ignition switch: ON)
OK:
System voltage
Replace injection pumpassembly.
Check and repair the harness between the
control relay and the injectionpump
assembly connector.
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Page 513 of 1839
DIESEL FUEL <4M4> -TroubleshootingDIESEL FUEL <4M4> -Troubleshooting13C-22
Code No. 49 Over boostProbable cause
Range of Check
DIgnition switch: ON, except duringenginecranking
Set Conditions
DBoost pressure is higher than 305 kPa for 1 second.DMalfunction of the turbocharger waste gate
DEngine-ECU inoperative
Turbocharger waste gate check (Refer to GROUP 15 - On-vehicle
Service.)NG
OK
Check the trouble symptoms.
NG
Replace the engine-ECU.Replace
Code No. 54 Immobilizer systemProbable cause
Range of Check
DIgnition switch: ON
Set Conditions
DImproper communication between the engine-ECU and immobilizer-ECUDRadio interference of encrypted codes
DIncorrect encrypted code
DMalfunction of harness or connector
DMalfunction of immobilizer-ECU
DEngine-ECU inoperative
NOTE
(1) If the ignition switches 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.
Is there another ignition key near the ignition key that is inserted
in the ignition switch?Ye sRemove the extra ignition key
No
Check the following connectors:
D-112, D-202, D-202-1, E-13NG
Repair
No
Is a diagnosis code output from the immobilizer-ECU?Ye sCheck the immobilizer system. (Refer to GROUP 54 - Ignition
Switch and Immobilizer System.)
NG OK
Check the trouble symptoms.
Check the harness between the engine-ECU and immobilizer-ECU.OKReplace the engine-ECU and immobilizer-ECU.
Check the trouble symptoms. NG
RepairNG
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Page 515 of 1839
DIESEL FUEL <4M4> -Troubleshooting13C-24
INSPECTION PROCEDURES FOR TROUBLE SYMPTOMS
Inspection procedure 1
No communication can be established between MUT-II
and all systems.
Probable cause
Probable cause can be found in troubles with the power supply circuit and the
earth circuit to the diagnosis connector.DDiagnosis connector inoperative
DHarness inoperative
OK
Check and repair the earth line.
OK
Replace MUT-II.
NG
Check and repair the harness
between the power supply and
diagnosis connector.
OK
Check the trouble symptoms.NG
Repair
NGCheck the following connector:
D-27, D-210, D-211
NGMeasure at D-23 diagnosis
connector.
DVoltage between 16 and the
earth
OK:
System voltage
Measure at D-23 diagnosis
connector.
DContinuity between 4 and the
earth
DContinuity between 5 and the
earth
OK:
Continuity
Inspection procedure 2
No communication can be established between MUT-II
and the engine-ECU.
Probable cause
Probable causes are shown in the following:
DThe power is not supplied to the engine-ECU.
DThe earth circuit of the engine-ECU inoperative
DThe engine-ECU inoperative
DCommunication between the engine-ECU and MUT-IIinoperativeDThe power supply circuit of the engine-ECU
inoperative
DEngine-ECU inoperative
DOpen circuit at the harness between the
engine-ECU and the diagnosis connector
NG
Check the harness between the engine-ECU and diagnosis
connector.NGRepair
OK
Check the trouble symptoms.
Check the following connector:
D-23, D-33, D-112, E-13,
D-06
Repair
OK
The engine-ECU power supply and the earth circuit check
(Refer to P.13B-31, Inspection procedure 19.)
NOTE
If the trouble symptoms persist even after implementing the above-mentioned inspection procedure to
the vehicle with center display, check the center display and replace it if necessary. (Refer to GROUP
54A - Clock or Center display.)
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Page 516 of 1839
DIESEL FUEL <4M4> -Troubleshooting13C-25
Inspection procedure 3
Immediately after the ignition switch is “ON”, the engine
warning lamp does not turn on.
Probable cause
The engine-ECU turns on theengine warning lamp for 5seconds immediately
after turning on the ignition switch to check thebulb for being blown.
If the engine warning lampdoes not turn on immediately after turning the ignition
switch ON, problems shown in the right could exist.DThe engine warning lamp blown
DThe engine warning lampcircuit inoperative
DEngine-ECU inoperative
NG
Replace the engine-ECU.
NG
Check and repair the harness
between the combination meter and
the engine-ECU connector.
NG
Check and repair theengine warning
lamppower supply circuit.
OK
Check the trouble symptoms.
OK
Measure at D-01 combination meter
connector.
DDisconnect the connector and
measure at the harness side.
DVoltage between 62 and the
earth (Ignition switch: ON)
OK:
System voltageOKCheck the following connectors:
D-01, D-02, D-110, E-13NG
Repair
NG
Checkbulb for being blown.
OK
Check the trouble symptoms.
OK
Measure at D-110 engine-ECU
connector.
DDisconnect the connector and
measure at the harness side.
DShort circuit between 8 and the
earth (Ignition switch:ON)
OK:
The engine warning lampturns
on.OKCheck the following connector:
D-110NG
Repair
MUT-
IIData list
11 Engine-ECU power supply voltage
(Refer to P.13C-33.)NGThe engine-ECU power supply and
the earth circuit check (Refer to
P.13C-31, Inspection procedure 19.)
Inspection procedure 4
The engine warning lamp keeps on and does not turn
off.
Probable cause
The probable causes can be found in either the engine-ECU detecting the
malfunction in the sensor and/or the actuator, or the problem shown in the right
takes place.DShort circuit at the harness between theengine
warning lamp and the engine-ECU
DEngine-ECU inoperative
Check the following connector:
E-28
NO
Measure at D-02 combination meter connector.
DDisconnect the connector and measure at the harness
side.
DDisconnect the engine-ECU connector.
DContinuity between 38 and the earth
OK:
No continuityNGCheck and repair the harness between the combination meter
and the engine-ECU connector.
OK
MUT-
IISelf-Diag code
Is a diagnosis code output?YESInspection chart for diagnosis codes (Refer to P.13C-7.)
Check the trouble symptoms.OKReplace the engine-ECU. NGNG
Repair
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Page 517 of 1839
DIESEL FUEL <4M4> -Troubleshooting13C-26
Inspection procedure 5
No initial combustion (unable to start)
Probable cause
Probable causes can be found in troubles with control system, injectionpump,
glow system, and power supply system.DControl system inoperative
DInjection pump inoperative
DGlow system inoperative
DEngine-ECU inoperative
NG
Repair
MUT-
IISelf-Diag code
Is a diagnosis code output?YESInspection chart for diagnosis codes (Refer to P.13C-7.)
NO
Conduct MUT-IIData list check and an actuator test. (Refer
to P.13C-30, 37.)OKCheck the following items in order:
DGlow plug, glowplugrelay
DBattery
DInjection nozzle
DInjection pump
DCompression pressure
DExistence of mixing foreign objects (water, kerosene) with
the fuel
Inspection procedure 6
Starting performance is bad when the engine is cold
(unable to start)
Probable cause
Probable causes can be found in troubles with control system, injectionpump,
fuel system, intake system, and glow system.DControl system inoperative
DInjection pump inoperative
DFuel system inoperative
DIntake system inoperative
DGlow system inoperative
DEngine-ECU inoperative
NG
Repair
MUT-
IISelf-Diag code
Is a diagnosis code output?YESInspection chart for diagnosis codes (Refer to P.13C-7.)
NO
Conduct MUT-IIData list check and an actuator test. (Refer
to P.13C-32, 37)OKInspect the following items in order:
DGlow plug, glowplugrelay
DInjection nozzle, fuel filter
DThrottle body assembly
DExistence of starter switch signal input
DEngine oil
DInjection pump
DExistence of mixing foreign objects (water, kerosene) with
the fuel
Inspection procedure 7
Starting performance is bad regardless of whether the
engine is hot or cold (unable to start)
Probable cause
Probable causes can be found in troubles with control system, injectionpump,
fuel system, and intake system.DControl system inoperative
DInjection pump inoperative
DFuel system inoperative
DIntake system inoperative
DEngine-ECU inoperative
NG
Repair
MUT-
IISelf-Diag code
Is a diagnosis code output?YESInspection chart for diagnosis codes (Refer to P.13C-7.)
NO
Conduct MUT-IIData list check and an actuator test. (Refer
to P.13C-32, 37.)OKInspect the following items in order:
DInjection nozzle, fuel filter
DThrottle body
DCompression pressure
DInjection pump
DExistence of mixing foreign objects (water, kerosene) with
the fuel
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