fuel pressure MITSUBISHI MONTERO 2000 Service Manual Online

DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-20
Code No. 41 Throttle solenoid valve systemProbable cause
Range of Check
DIgnition switch: OFF
DBarometric pressure is 95.4 kPa or over (equivalent to an altitude of 500 m).
Set Conditions
DBoost pressure sensor output does not change.DThrottle solenoid valve inoperative
DThrottle solenoid valve open circuit, short circuit, or
connector contact inoperative
DEngine-ECU inoperative
DMalfunction of throttle actuator
Check and repair the harness between the
engine-ECU and the solenoid valve
connector.
NG
OK
Check the trouble symptoms.
OK
Check and repair the harness between the
control relay and the solenoid valve
connector. NG
OKMeasure at B-62 throttle solenoid valve
connector
DDisconnect the connector and measure at
the harness side.
DVoltage between 2 and the earth
(Ignition switch: ON)
OK:System voltage
OK
Replace
Throttle actuator check
(Refer to P.13E-63.)NG
OK
Throttle solenoid valve check
(Refer to P.13E-62.)
Replace the engine-ECU. OK
RepairCheck the following connector:D-110
Check the trouble symptoms.NGReplace NG
Check the following connector:
B-62NG
RepairNGMeasure 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 voltage
NG


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-24
Code No. 49 Over boostProbable cause
Range of Check
DIgnition switch: ON
Set Conditions
DBoost pressure is higher than the barometric pressure + 133 kPaDMalfunction of the variable geometry actuator
DMalfunction of variable geometry solenoid valve
DVariable geometry solenoid valve open circuit, short
circuit, or connector contact inoperative
DEngine-ECU inoperative
OKOK
Check and repair the harness between the
control relay and the solenoid valve
connector.
Replace the engine-ECU.OK
ReplaceVariable geometry solenoid valve check
(Refer to GROUP 15 - On-vehicle Service.)
Check the trouble symptoms.NG
NG
Check the following connector:B-61NG
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 17 and earth
(Ignition switch: ON)
OK:System voltageOK
Measure at B-61 variable geometry solenoid
valve connector
DDisconnect the connector and measure at
the harness side.
DVoltage between 2 and earth
(Ignition switch: ON)
OK:System voltage
Check and repair the harness between the
engine-ECU and the solenoid valve
connector.
ReplaceVariable geometry actuator check (Refer to
GROUP 15 - On-vehicle Service.)NG
OK
Repair
Check the following connector:D-110NG
NG
Replace the turbocharger assembly. YESConnect a boost gauge to the boost
pressure sensor hose. When the vehicle is
driven at 1st gear with full throttle, does
boost pressure exceed 133 kPa
momentarily?
NO


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-25
Code No. 51 EGR valve position sensor systemProbable cause
Range of Check
DIgnition switch: ON, except during engine cranking
Set Condition
DOutput voltage of EGR valve position sensor for 3 seconds is 4.85 V or
higher, or lower than 0.15 VDEGR valve position sensor inoperative
DEGR valve position sensor open circuit, short
circuit or connector circuit inoperative
DEngine-ECU inoperative
Repair NG
NG
OK
Check the harness between the engine-ECU
and the EGR valve position sensor
connector.
Replace the engine-ECU.
Repair NG
OK
NG
Repair
OK
OK
Check the harness between the
engine-ECU and the EGR valve position
sensor connector.
EGR valve position sensor check
(Refer to P.13E-60.)
OKReplace
Check the following connector:D-113
Check the trouble symptoms.NG
NG
Check the following connector:B-66NG
Repair
OK
Check the trouble symptoms.
NG
NGMeasure at D-113 engine-ECU connector
DConnect the connector.
DVoltage between 90 and earth.
OK:0.4 - 0.6 V
(Ignition switch: ON)
4.1 - 4.8 V
(When 60 kPa of negative pressure is
applied to the EGR valve nipple and the
valve is fully open)OK
Measure at B-66 EGR valve position sensor
connector.
DDisconnect the connector and measure at
the harness side.
DVoltage between 2 and earth
(Ignition switch: ON)
OK:4.5 - 5.5 V
DContinuity between 3 and earth
OK:Continuity
Replace the engine-ECU.
Replace the engine-ECU.
Check the following connector:D-112NG
Repair
OK
Check the trouble symptoms.
NG


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-26
Code No. 52 Variable geometry control pressure sensor
systemProbable cause
Range of Check
DIgnition switch: ON, except during engine cranking
Set Condition
D4.5 V or higher, or 0.2 V or lower
Range of Check
DEngine idling
Set Conditions
DThe difference between target and actual negative pressures remains 10.6
kPa or more for 10 seconds.DVariable geometry control pressure sensor
inoperative
DVariable geometry control pressure sensor open
circuit, short circuit or connector contact
inoperative
DVacuum hose disconnected or ruptured
DEngine-ECU inoperative
NGReplace the engine-ECU.
Check the harness between the
engine-ECU and the variable
geometry control pressure sensor
connector, if necessary.
NG
Check the trouble symptoms.OK
NG
Repair
Replace the variable geometry
control pressure sensor.OK
NG
Repair
Check the vacuum hose and pipe
between the variable geometry
control pressure sensor and
alternator.OK
NG
Repair
NG
NG
Check the trouble symptoms.OK
Repair
Check the trouble symptoms.
OK
Replace the engine-ECU.OK
Repair NG NG
Check the harness between the
engine-ECU and the variable
geometry control pressure sensor
connector.
Check the trouble symptoms.OK
NG
Repair
Check the following connector:
D-111NG
Repair
OK
OKOK
Check the following connector:
B-63NG
NGNG
Check the following connector:
B-63
Measure at B-63 variable geometry
control pressure sensor connector.
DConnect the connector.
(Use the test harness:
MB991348)
DVoltage between 1 and earth
(Ignition switch: ON)
OK:Altitude 0 m: 3.7 - 4.3 V
Altitude 1,200 m: 3.2 - 3.8
V
OK:0.5 - 1.2 V when 80 kPa
of negative pressure is ap-
plied to the sensor
Measure at D-111 engine-ECU
connector
DConnect the connector.
DVoltage between 45 and earth.
(Ignition switch: ON)
OK:Altitude 0 m: 3.7 - 4.3 V
Altitude 1,200 m: 3.2 - 3.8
V
OK:0.5 - 1.2 V when 80 kPa
of negative pressure is ap-
plied to the sensor
Measure at B-63 variable geometry
control pressure sensor connector
DDisconnect the connector, and
measure at the harness side.
DVoltage between 3 and earth
(Ignition switch: ON)
OK:4.8 - 5.2 V
DContinuity between 2 and earth
OK:ContinuityCheck the following connector:
D-112
Check the harness between the
engine-ECU and the variable
geometry control pressure sensor
connector.


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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-40
DATA LIST REFERENCE TABLE
Item
No.Check itemInspection conditionsValue to be
determined
as normalCode No.
or inspec-
tion proce-
dure No.Reference
page
01Boost air
temperatureIgnition switch: ON or
the engine runningWhen the intake air
temperature is - 20_C-20_CCode No.
1613E-12
p
sensor
gg
When the intake air
temperature is 0_C0_C
When the intake air
temperature is 20_C20_C
When the intake air
temperature is 40_C40_C
When the intake air
temperature is 80_C80_C
02Engine
coolant
temperatureIgnition switch: ON or
the engine runningWhen the engine
coolant temperature is
-20_C-20_CCode No.
1513E-12
p
sensorWhen the engine
coolant temperature is
0_C0_C
When the engine
coolant temperature is
20_C20_C
When the engine
coolant temperature is
40_C40_C
When the engine
coolant temperature is
80_C80_C
03BarometricIgnition switch: ONAltitude 0 m101 kPaCode No.
13
13E-11
pressure
sensor
g
Altitude 600 m95 kPa13
sensorAltitude 1,200 m88 kPa
Altitude 1,800 m81 kPa
04BoostDEngine coolant
tt
Altitude 0 m101 kPaCode No.
12
13E-10
pressure
sensor
g
temperature:
80-95_CAltitude 600 m95 kPa12
sensor80-95_C
DLamps, electricalAltitude 1,200 m88 kPaLamps,electrical
cooling fan, and
accessories:OFFAltitude 1,800 m81 kPaaccessories:OFF
DTransmission:Idling81 - 109 kPaDTransmission:
Neutral
DIgnition switch: ONWhen sudden racing is
doneIncreased
05Fuel
temperatureIgnition switch: ON or
the engine runningWhen the fuel
temperature is - 20_C-20_CCode No.
1413E-11
p
sensor
gg
When the fuel
temperature is 0_C0_C
When the fuel
temperature is 20_C20_C
When the fuel
temperature is 40_C40_C
When the fuel
temperature is 80_C80_C


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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-47
Terminal
No.Normal condition: Inspection conditions (engine status) Check item
21A/C relayA/C switch: OFF→ONSystem voltage→0-1
V
31Idle switchIgnition switch: ONRelease the foot from the
accelerator pedal.0-1V
Step on the accelerator
pedal slightly3 V or higher
32A/C switchA/C in operation (compressor in operation)System voltage
36Selector switch
between A/T and M/TIgnition switch: ONSystem voltage (M/T)
46Control relayIgnition switch: ON0-1V
Ignition switch: ON→OFF (in about 8 seconds)System voltage
51Pump speed sensorEngine: Idling (Use a digital voltage meter to check.)0V↔5V
(repeat the change)
55Accelerator pedal
position sensor (sub)Ignition switch: ONAccelerator pedal: Idling
position0.9 - 1.1 V
Accelerator pedal: Fully
opened position3.7 V or higher
60Sensor power supplyIgnition switch: ON4.6 - 5.4 V
71Ignition switch-STEngine: Cranking8 V or higher
80Back-up power supplyIgnition switch: OFFSystem voltage
81Power supply to accel-
erator pedal position
sensor (main)Ignition switch: ON4.6 - 5.4 V
82Ignition switch-IGIgnition switch: ONSystem voltage
83Engine coolant tem-
perature sensorIgnition switch: ONEngine coolant
temperature: 0_C3.7 - 4.3 V
Engine coolant
temperature: 20_C2.8 - 3.4 V
Engine coolant
temperature: 40_C1.9 - 2.5 V
Engine coolant
temperature: 80_C0.6 - 1.2 V
84Accelerator pedal posi-
tion sensor (main)Ignition switch: ONAccelerator pedal: Idling
position0.9 - 1.1 V
Accelerator pedal: Fully
opened position3.7 V or higher
85Boost pressure sensorIgnition switch: ON (101 kPa)1.0 - 1.4 V
86Vehicle speed sensorDIgnition switch: ON
DMove the vehicle forward slowly0V↔8 - 12 V
(repeat the change)
87Fuel temperature sen-
sor
Ignition switch: ONFuel temperature: 0_C3.2 - 3.6 V
sorFuel temperature: 20_C2.3 - 2.7 V
Fuel temperature: 40_C1.5 - 1.9 V
Fuel temperature: 80_C0.4 - 0.8 V


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