2000 MITSUBISHI MONTERO Service Repair Manual

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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DIESEL FUEL <4M4> -Troubleshooting13C-23
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble SymptomInspection
procedure
No.Reference
page
No communication canNo communication can be established with all systems.113C-24
be established be-
tween MUT-IIand the
engine-ECU.No communication can be established only with the
engine-ECU.213C-24
Engine warning lamp
relatedImmediately after the ignition switch is “ON”, the engine
warning lamp does not turn on.313C-25
The engine warning lamp keeps on and does not turn off.413C-25
Starting performanceNo initial combustion (unable to start)513C-26
Starting performance is bad when the engine is cold (difficult to
start)613C-26
Starting performance is bad regardless of when the engine is
hot or cold (difficult to start)713C-26
Idling stability
(idling inoperative)Low idling speed when the engine is cold (improper idling
speed)813C-27
High idling speed (improper idling speed)913C-27
Low idling speed (improper idling speed)1013C-27
Idling instable (rough idling, hunting)1113C-28
Idling stabilityThe engine halts after running for a while.1213C-28
(idling sustainment in-
operative)The engine halts during idling.1313C-29
DriveabilityLack of output power1413C-29
Occurrence of abnormal knocking1513C-29
Abnormal black smoke1613C-30
Abnormal white smoke1713C-30
Hunting during driving1813C-31


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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-06NG
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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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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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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DIESEL FUEL <4M4> -Troubleshooting13C-27
Inspection procedure 8
Low idling speed when the engine is cold (improper
idling speed)
Probable cause
Probable causes can be found in troubles with control system, injectionpump,
and fuel system.DControl system inoperative
DInjection pump inoperative
DFuel 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 pump
DFuel filter
Inspection procedure 9
High idling speed (improper idling speed)
Probable cause
Probable causes can be found in troubles with control system and injection
pump.DControl system inoperative
DInjection pump 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 pump
DStarter switch signal
Inspection procedure 10
Low idling speed (improper idling speed)
Probable cause
Probable causes can be found in troubles with control system, injectionpump,
and fuel.DControl system inoperative
DInjection pump inoperative
DFuel 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
DInjection pump


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DIESEL FUEL <4M4> -Troubleshooting13C-28
Inspection procedure 11
Idling instable (rough idling, hunting)
Probable cause
Probable causes can be found in troubles with control system, injectionpump,
fuel system, glow system, intake system, and EGR system.DControl system inoperative
DInjection pump inoperative
DFuel system inoperative
DIntake system inoperative
DGlow system inoperative
DEGR 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
DEGR system
DInjection nozzle
DCompression pressure
DValve clearance
DThrottle body assembly
DInjection timing
DFuel line bleeding
DInjection pump
Inspection procedure 12
The engine stalls after running for a while.
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:
DThrottle body assembly
DFuel filter
DInjection pump


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DIESEL FUEL <4M4> -Troubleshooting13C-29
Inspection procedure 13
The engine stalls during idling.
Probable cause
Probable causes can be found in troubles with control system, injectionpump,
intake system, EGR system, and power supply.DControl system inoperative
DInjection pump inoperative
DFuel system inoperative
DEGR 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:
DPower supply system
DThrottle body assembly
DEGR system
DInjection pump
Inspection procedure 14
Lack of output power
Probable cause
Probable causes can be found in troubles with control system, injectionpump,
fuel system, intake system, and EGR system.DControl system inoperative
DInjection pump inoperative
DFuel system inoperative
DIntake system inoperative
DEGR 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 assembly
DEGR system
DTurbocharger
DCompression pressure
DInjection timing
DInjection pump
DExistence of mixing foreign objects (water, kerosene) with
the fuel
Inspection procedure 15
Occurrence of abnormal knocking
Probable cause
Probable causes can be found in troubles with control system, injectionpump,
fuel system, and EGR system.DControl system inoperative
DInjection pump inoperative
DFuel system inoperative
DEGR 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
DInjection timing
DEGR system
DInjection pump


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