2000 MITSUBISHI MONTERO Service Repair Manual

DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-31
INSPECTION PROCEDURE 5
No initial combustion (unable to start)
Probable cause
Probable causes can be found in troubles with control system, injection pump,
glow system, and power supply system.DControl system inoperative
DInjection pump 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.13E-8.)
NO
Conduct MUT-IIData list check and an actuator test.
(Refer to P.13E-40, 44.)OKCheck the following items in order:
DGlow plug, glow plug relay
DBattery
DInjection nozzle
DThrottle body assembly
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, injection pump,
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.13E-8.)
NO
Conduct MUT-IIData list check and an actuator test.
(Refer to P.13E-40, 44.)OKInspect the following items in order:
DGlow plug, glow plug relay
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


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-32
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, injection pump,
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.13E-8.)
NO
Conduct MUT-IIData list check and an actuator test.
(Refer to P.13E-40, 44.)OKInspect the following items in order:
DInjection nozzle, fuel filter
DThrottle body assembly
DCompression pressure
DInjection pump
DExistence of mixing foreign objects (water, kerosene) with
the fuel
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, injection pump,
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.13E-8.)
NO
Conduct MUT-IIData list check and an actuator test.
(Refer to P.13E-40, 44.)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.13E-8.)
NO
Conduct MUT-IIData list check and an actuator test.
(Refer to P.13E-40, 44.)OKInspect the following items in order:
DInjection pump
DStarter switch signal


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-33
INSPECTION PROCEDURE 10
Low idling speed (improper idling speed)
Probable cause
Probable causes can be found in troubles with control system, injection pump,
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.13E-8.)
NO
Conduct MUT-IIData list check and an actuator test.
(Refer to P.13E-40, 44.)OKInspect the following items in order:
DInjection nozzle
DInjection pump
INSPECTION PROCEDURE 11
Idling instable (rough idling, hunting)
Probable cause
Probable causes can be found in troubles with control system, injection pump,
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.13E-8.)
NO
Conduct MUT-IIData list check and an actuator test.
(Refer to P.13E-40, 44.)OKInspect the following items in order:
DGlow plug, glow plug relay
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, injection pump,
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.13E-8.)
NO
Conduct MUT-IIData list check and an actuator test.
(Refer to P.13E-40, 44.)OKInspect the following items in order:
DThrottle body assembly
DFuel filter
DInjection pump


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-34
INSPECTION PROCEDURE 13
The engine stalls during idling.
Probable cause
Probable causes can be found in troubles with control system, injection pump,
intake system, EGR system, and power supply.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.13E-8.)
NO
Conduct MUT-IIData list check and an actuator test.
(Refer to P.13E-40, 44.)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, injection pump,
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.13E-8.)
NO
Conduct MUT-IIData list check and an actuator test.
(Refer to P.13E-40, 44.)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, injection pump,
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.13E-8.)
NO
Conduct MUT-IIData list check and an actuator test.
(Refer to P.13E-40, 44.)OKInspect the following items in order:
DInjection nozzle
DInjection timing
DEGR system
DInjection pump


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-35
INSPECTION PROCEDURE 16
Abnormal black smoke
Probable cause
Probable causes can be found in troubles with control system, injection pump,
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.13E-8.)
NO
Conduct MUT-IIData list check and an actuator test.
(Refer to P.13E-40, 44.)OKInspect the following items in order:
DAir cleaner
DInjection nozzle
DThrottle body assembly
DEGR system
DTurbocharger
DInjection pump
INSPECTION PROCEDURE 17
Abnormal white smoke
Probable cause
Probable causes can be found in troubles with control system, injection pump,
fuel system, intake system, EGR system, and glow system.DControl system inoperative
DInjection pump inoperative
DFuel system inoperative
DIntake system inoperative
DEGR 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.13E-8.)
NO
Conduct MUT-IIData list check and an actuator test.
(Refer to P.13E-40, 44.)OKInspect the following items in order:
DGlow plug, glow plug relay
DInjection nozzle
DThrottle body assembly
DEGR system
DTurbocharger
DInjection pump
INSPECTION PROCEDURE 18
Hunting during driving
Probable cause
Probable causes can be found in troubles with control system, injection pump,
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.13E-8.)
NO
Conduct MUT-IIData list check and an actuator test.
(Refer to P.13E-40, 44.)OKInspect the following items in order:
DInjection nozzle
DInjection pump


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-36
INSPECTION PROCEDURE 19
A/C condenser fan operating problem
Probable cause
The power transistor inside the engine-ECU turns on and off to control the A/C
condenser fan motor relay.DMalfunction of A/C condenser fan motor relay
DMalfunction of A/C condenser fan motor
DMalfunction of thermostat
DOpen circuit or short-circuit in circuit, or poor
connector contact
DMalfunction of engine-ECU
Check the following connector:D-110
OK
Measure at engine-ECU connector D-110.
DDisconnect the connector and measure at the harness
side.
DCheck the A/C condenser fan condition.
(Ignition switch: ON)
OK:Fan stopped
DVoltage between 7 and the earth
(Ignition switch: ON)
OK:System voltage
DShort out 7 and the earth
(Ignition switch: ON)
OK:A/C condenser fan turnsNGA/C condenser fan motor circuit check
(Refer to the wiring harness configuration diagram.)
OK
MUT-IIData list
02 Engine coolant temperature sensor
OK:When engine is idling after having warmed up, the en-
gine coolant temperature and the MUT-IIdisplay temper-
ature are identicalNGEngine coolant temperature sensor check
(Refer to Code 15 on P.13E-59.)
Check the trouble symptoms.OK
Replace the engine-ECU.NG
Repair
Thermostat checkNG
NGReplace
OK


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-37
INSPECTION PROCEDURE 20
Engine-ECU power supply and earth circuit check
(5) NG
Check the trouble symptoms.
NG
Repair
(2), (3) NGOK
Check the trouble symptoms.
OK
NG
Check the harness between the
engine-ECU and the ignition switch.
Ignition switch check
(4) NG
Check and repair the harness
between the engine-ECU and the
earth.
OK
Check the following connectors:
D-110, D-111, D-113
NG
Replace the engine-ECU.
OK
Check the trouble symptoms.Repair NG
NG
RepairCheck the following connectors:
B-25X, D-128
NG
Check and repair the harness
between the engine-ECU and the
control relay connector.
Check and repair the harness
between the engine-ECU and the
battery.
Check the following connectors:
D-208, D-223, E-13NG
RepairMeasure at D-110, D-111, D-113
engine-ECU connectors.
DDisconnect the connector and
measure at the harness side.
(1) Voltage between 82 and the
earth (Ignition switch: ON)
OK:System voltage
(2) Voltage between 46 and the
earth
OK:System voltage
(3) Voltage between 12, 25 and the
earth (Ignition switch: ON)
OK:System voltage
(When terminal 38 is short
circuited to theearth)
(4) Continuity between 13, 26 and
the earth
OK:Continuity
(5) Voltage 80 and the earth
OK:System voltage(1) NG
OK
INSPECTION PROCEDURE 21
Fuel cut solenoid valve circuit inspection
NG
Check the harness between the
engine-ECU and the fuel cut
solenoid valve connector.
OK
Replace the engine-ECU.
OK
Check the fuel injection pump
assembly connector B-38, and repair
if necessary.
OK
Check the trouble symptoms.
OK
Measure at fuel injection pump
assembly connector B-38.
DDisconnect the connector and
measure at the harness side.
DVoltage between 1 and the earth
(Ignition switch: ON)
OK:System voltageOKCheck the following connector:
D-110NG
Repair
Fuel cut solenoid valve check
(Refer to P.13E-61.)NGReplace the injection pump.
NG
Repair


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-38
INSPECTION PROCEDURE 22
EGR control solenoid valve No. 1 circuit inspection
NG
Check the harness between the
engine-ECU and the EGR control
solenoid valve No. 1 connector, and
repair if necessary.
OK
Check the trouble symptoms.
OK
Measure at EGR control solenoid
valve No. 1 connector B-35.
DDisconnect the connector and
measure at the harness side.
DVoltage between 1 and the earth
(Ignition switch: ON)
OK:System voltage
NG
Check the following connector:
B-35NG
Repair NG
Check the harness between the
control relay and the EGR control
solenoid valve No. 1 connector, and
repair if necessary.
EGR control solenoid valve No. 1
check (Refer to GROUP 17 -
Service Adjustment Procedures.)NG
Replace
OK
Measure at engine-ECU connector
D-110.
DDisconnect the connector and
measure at the harness side.
DVoltage between 9 and the earth
(Ignition switch: ON)
OK:System voltage
NG
Replace the engine-ECU. NGCheck the trouble symptoms.OK
Repair
Check the following connector:
D-110OK
INSPECTION PROCEDURE 23
EGR control solenoid valve No. 2 circuit inspection
NG
Check the harness between the
engine-ECU and the EGR control
solenoid valve No. 2 connector, and
repair if necessary.
OK
Check the trouble symptoms.
OK
Measure at EGR control solenoid
valve No. 2 connector B-34.
DDisconnect the connector and
measure at the harness side.
DVoltage between 1 and the earth
(Ignition switch: ON)
OK:System voltage
NG
Check the following connector:
B-34NG
Repair NG
Check the harness between the
control relay and the EGR control
solenoid valve No. 2 connector, and
repair if necessary.
EGR control solenoid valve No. 2
check (Refer to GROUP 17 -
Service Adjustment Procedures.)NG
Replace
OK
Measure at engine-ECU connector
D-110.
DDisconnect the connector and
measure at the harness side.
DVoltage between 5 and the earth
(Ignition switch: ON)
OK:System voltage
NG
Replace the engine-ECU. NGCheck the trouble symptoms.OK
Repair
Check the following connector:
D-110OK


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