sensor MITSUBISHI MONTERO 2000 Service Repair Manual

DIESEL FUEL <4M4> -Troubleshooting13C-13
Code No. 18 Engine speed sensor (backup) systemProbable cause
Range of Check
DExcept for duringengine running andcranking
Set Conditions
DThe difference in the enginespeed sensor output for 4 seconds: 325 r/min or
moreDEngine speed sensor inoperative
DEngine speed sensoropencircuit, short circuit, or
connector contact inoperative
DEngine-ECU inoperative
Check the trouble symptoms.
OK
Check and repair the harness
between the enginespeed sensor
and the control relay connector.OK
OK
NG
Repair
(1) NGMeasure at B-36-2 enginespeed
sensor connector
DConnect the connector.
(Test harness: MB998348 used)
DVoltage between 2 and the earth
(Engine: cranking)
OK:
0.4 - 4.0 V
DVoltage between 2 and the earth
(Engine: Idling)
OK:
1.5 - 2.5 V
NG
Replace the enginespeed sensor.
Replace the engine-ECU.
Check the following connector:
B-36
NG
NG
Check the trouble symptoms.
OK
Repair NG
OK
Repair NG NG
OKRepair NG
NG
OKRepair NG
Check the following connector:
B-36-2
Check the trouble symptoms.
Measure at B-36-2 enginespeed
sensor connector
DDisconnect the connector and
measure at the harness side.
(1) Voltage between 3 and the earth
(Ignition switch: ON)
OK:
System voltage
(2) Voltage between 2 and the earth
(Ignition switch: ON)
OK:
4.8 - 5.2V
(3) Continuity between 1 and the
earth
OK:
Continuity(2) NG
(3) NG
Check the harness between the
engine-ECU and the enginespeed
sensor connector.
Replace the engine-ECU.
Check and repair the harness
between the enginespeed sensor
and the earth.
Check the following connector:
B-36
Check the trouble symptoms.
Check the following connectors:
B-36, D-112


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DIESEL FUEL <4M4> -Troubleshooting13C-14
Code No. 21 Engine speed sensor systemProbable cause
Range of Check
DDuring enginecranking
Or
DExcept for duringengine running andcranking
Set Conditions
DNo change in the sensor output voltage for 3 seconds (no pulse signal has
been input).
Or
DNo change in the enginespeed sensor output for 0.06 seconds (for backup),
or in the sensor output for 0.3 secondsDEngine speed sensor inoperative
DEngine speed sensoropencircuit, short circuit, or
connector contact inoperative
DEngine-ECU inoperative
OK
Check and repair the harness
between the enginespeed sensor
and the control relay connector.OK
OK
NG
Repair
(1) NGMeasure at B-36-1 enginespeed
sensor connector
DConnect the connector.
(Test harness: MB998348 used)
DVoltage between 2 and the earth
(Engine: cranking)
OK:
0.4 - 4.0 V
DVoltage between 2 and the earth
(Engine: idling)
OK:
1.5 - 2.5 V
NG
Replace the enginespeed sensor.
Replace the engine-ECU.
Check the following connector:
B-36
NG
NG
Check the trouble symptoms.
OK
Repair
Check the following connectors:
B-36, D-112
NG
OK
Repair NG
Check the harness between the
engine-ECU and the enginespeed
sensor connector.NG
Check the trouble symptoms.
Replace the engine-ECU.
Check and repair the harness
between the enginespeed sensor
and the earth.OK
Repair
Check the following connector:
B-36
NG
NG
Check the trouble symptoms. OK
Repair NG
Check the following connector:
B-36-1
Check the trouble symptoms.
Measure at B-36-1 enginespeed
sensor connector
DDisconnect the connector and
measure at the harness side.
(1) Voltage between 3 and the earth
(Ignition switch: ON)
OK:
System voltage
(2) Voltage between 2 and the earth
(Ignition switch: ON)
OK:
4.8 - 5.2V
(3) Continuity between 1 and the
earth
OK:
Continuity(2) NG
(3) NG


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DIESEL FUEL <4M4> -Troubleshooting13C-15
Code No. 23 Idle switch (accelerator pedal position
sensor built-in) systemProbable cause
Range of Check
Ignition switch: ON, acceleratorpedal positionsensor (main, sub) operative,
except for duringenginecranking
Set Conditions
DFor 1 minute idleswitch (built-in): ON, acceleratorpedal positionsensor
(main, sub) output voltage 1.875V or higher or 10 minutes
DIdle switch (built-in): OFF, acceleratorpedal positionsensor (main, sub)
opening degreesless than 1%DAcceleratorpedal positionsensor inoperative
DAcceleratorpedal positionsensoropencircuit,
short circuit, or connector contact inoperative
DIdle switch “ON” inoperative
DIdle switch signallineshort circuit
DEngine-ECU inoperative
OK
Measure at D-135 acceleratorpedal position
sensor connector
DDisconnect the connector and measure at
the harness side.
DVoltage between 4 and the earth
(Ignition switch: ON)
OK:
4.5 - 5.5 V
DContinuity between 5 and the earth
OK:
ContinuityNGCheck the following connectors:
D-111, D-112NG
Repair
OK
OKRepair
NGAcceleratorpedal positionsensor check
(Refer to P.13C-43.)
Check the trouble symptoms.
Replace the engine-ECU.NG
Replace the engine-ECU.OKNG
OK
Check the following connector:
D-135Replace
NG
Check the trouble symptoms.
Check the harness between the
engine-ECU and the accelerator pedal
position sensor connector.
NG
Repair


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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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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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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-32
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.
1613C-11
sensorWhen 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 cool-
ant temper-
ature sensorIgnition switch: ON or
the engine runningWhen the engine cool-
ant temperature is
-20_C-20_CCode No.
1513C-11
When the engine cool-
ant temperature is
0_C0_C
When the engine cool-
ant temperature is
20_C20_C
When the engine cool-
ant temperature is
40_C40_C
When the engine cool-
ant temperature is
80_C80_C
03BarometricIgnition switch: ONAltitude 0 m101 kPaCode No.13C-10
pressureAltitude 600 m95 kPa13
sensorAltitude 1,200 m88 kPa
Altitude 1,800 m81 kPa
04Boost pres-DEngine coolantAltitude 0 m101 kPaCode No.13C-9
sure sensortemperature:Altitude 600 m95 kPa12
80 - 95_C
DLamps, electricalAltitude 1,200 m88 kPa
cooling fan, andAltitude 1,800 m81 kPaaccessories: OFF
DTransmission: PIdling81 - 109 kPaDTransmission: P
range
DIgnition switch: ON
When sudden racing is
doneIncreased
05Fuel tem-
peratureIgnition switch: ON or
the engine runningWhen the fuel temper-
ature is - 20_C-20_CCode No.
1413C-10
sensorWhen the fuel temper-
ature is 0_C0_C
When the fuel temper-
ature is 20_C20_C
When the fuel temper-
ature is 40_C40_C
When the fuel temper-
ature is 80_C80_C


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DIESEL FUEL <4M4> -Troubleshooting13C-33
Item
No.Reference
page Code No.
or inspec-
tion proce-
dure No. Value to be
determined
as normal Inspection conditions Check item
06Vehicle
speed sen-
sorWhen drivingCompare the engine
speed displayed in the
speed meter with that
in MUT-IIMatchedCode No.
1713C-12
07Engine
speed sen-Engine: CrankingCompare the engine
speed displayed in theMatchedCode No.
1813C-13
sor (backup)Engine: Idlingtachometer with that in
MUT-II
08Engine
speed sen-Engine: CrankingCompare the engine
speed displayed in theMatchedCode No.
2113C-14
sorEngine: Idlingtachometer with that in
MUT-II
09Accelerator
pedal posi-Ignition switch: ONAccelerator pedal:
Idling position0.9 - 1.1VCode No.
1113C-8
tion sensor
(main)Accelerator pedal:
Fully opened position4.1 V or high-
er
10Idle switchIgnition switch: ONRelease the foot from
the accelerator pedal.0-1VCode No.
2313C-15
Step on the accelera-
tor pedal slightly4V or higher
11System volt-
ageIgnition switch: ONSystem volt-
ageProcedure
No. 1913C-31
13Timing con-Engine: After warmingIdling0%*1Code No.13C-16
trol valve*1up the engine2,500 r/min35 - 45%*125 or No.13C-20
High idling20 - 30%*143
14EGR com-
mand valueEngine: Idling0 - 100%*2–-
mand value
Engine: After warming up the engine
17Control
sleeve posi-Engine: After warming
up the engineIdling1.535 -
1.735 VCode No.
2613C-17
tion (target
value)2,500 r/minSlightly de-
creased.
High idling1.884 -
2.084 V
18Actual injec-Engine: After warmingIdling0.65 - 0.85 V––
tion timingup the engine2,500 r/min2.325 -
2.525 V
High idling3.814 -
4.014 V
19InjectionEngine: After warmingIdling0.3 - 0.5 V––
timing com-
mand valueup the engine2,500 r/min2.325 -
2.525 V
High idling3.814 -
4.014 V


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DIESEL FUEL <4M4> -Troubleshooting13C-34
Item
No.Reference
page Code No.
or inspec-
tion proce-
dure No. Value to be
determined
as normal Inspection conditions Check item
21GE actuatorEngine: After warmingIdling20 - 30%Code No.13C-17
up the engine2,500 r/min20 - 30%26 or No.13C-21
High idling20 - 29%48
22EGR dutyEngine: Idling0 - 100%*2––
valueEngine: After warming up the engine
23Control
sleeve posi-Engine: After warming
up the engineIdling1.535 -
1.735 VCode No.
2613C-17
tion (actual
value)2, 500 r/minSlightly de-
creased.
High idling1.884 -
2.084 V
24Accelerator
pedal posi-Ignition switch: ONAccelerator pedal:
Idling position0.9 - 1.1 VCode No.
2713C-18
tion sensor
(sub)Accelerator pedal:
Fully opened position4.1V or
higher
25Accelerator
pedal posi-Ignition switch: ONAccelerator pedal:
Idling position0%Code No.
2713C-18
tion sensor
(sub)Accelerator pedal:
Fully opened position99 - 100%
NOTE
*1: The opening degree of the timing control valve is converted into percentage. (0%: timer non-advanced angle,
100%: timer maximum advanced angle)
*
2: The opening degree of the EGR solenoid valve is converted into percentage.
Item
No.
Check itemInspection conditionsValue to be
determined
as normalCode No.
or inspec-
tion proce-
dure No.Reference
page
41Idle switchIgnition switch: ON
(check by repeatedRelease the foot from
the accelerator pedal.ON––
accelerator operation)Step on the accelerator
pedal slightly.OFF
43A/C switchEngine: Idling (The
A/C compressorA/C switch: ONON––
should be in operation
when the A/C switch is
“ON”)A/C switch: OFFOFF
44IgnitionIgnition switch: ONEngine: StopOFF––
switch-STEngine: CrankingON
45Ignition
switch-IGIgnition switch: ONON––
46Control
relayIgnition switch: ONON––
47A/C relayEngine: Idling after
warming up the engineA/C switch: OFFOFF (A/C
compressor
clutch not in
operation)––
A/C switch: ONON (A/C
compressor
clutch in op-
eration)


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DIESEL FUEL <4M4> -Troubleshooting13C-37
ACTUATOR TEST TABLE
Item
No.Check itemDrive Con-
tentsInspection
conditionsValue to be determined
as normalCode No.
or inspec-
tion proce-
dure No.Reference
page
02Glow plug relayTurning theIgnition switch:Battery charge is––
relay from
OFF to ON orONenergized to the glow
plug when the glow
from ON to
OFFplug relay is ON.
03A/C compressorTurning theIgnition switch:The A/C compressor––
relayrelay from
OFF to ON orONclutch makes an
audible sound.
from ON to
OFF
11Timing control
valveTurn the
timing control
valve to ONDIgnition
switch: ON
DEngine:
IdlingMakes an audible
soundCode
No.4313C-20
12Turn the
timing control
valve to OFF
Idling
DTimer piston
position
sensor:
Normal
15Glow lampTurn the glow
lamp on or offIgnition switch:
ONThe glow lamp turns
on––
16Warning lampTurn the
warning lamp
on or offIgnition switch:
ONThe warning lamp
turns onProcedure
No.3, 413C-25
22Condenser fan
relayTurning the
relay from
OFF to ON or
from ON to
OFFIgnition switch:
ONThe condenser fan
rotates.––
23Main throttle
solenoid valveTurn the
solenoid
valve from
OFF to ON or
from ON to
OFFDIgnition
switch: ON
DVehicle
speed:
0 km/h
DEngine
speed:
1,000 r/min
or lowerMakes an audible
soundCode
No.4113C-19
24Sub throttle
solenoid valveTurn the
solenoid
valve from
OFF to ON or
from ON to
OFFDIgnition
switch: ON
DVehicle
speed:
0 km/h
DEngine
speed:
1,000 r/min
or lowerMakes an audible
sound––


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