ignition MITSUBISHI MONTERO 2000 Service Manual PDF

GDI -Troubleshooting 13A-100
Inspection procedure 28
Accelerator pedal position switch system
Probable cause
The accelerator pedal positionswitch detects that the acceleratorpedal isfully closed,
and sends a signal to the engine-ECU. The engine-ECU controlsidle speed,based
on this signal.DMaladjustment of the accelerator cable
DMaladjustment of the accelerator pedal positionswitch
DOpen circuit or short-circuited harness wire in the
accelerator pedal positionswitch system, or poor
connector contact
DMalfunction of the engine-ECU
NG
Repair
NG
Repair
Check the acceleratorpedal positionswitch. (Refer to P.13A-230.)NGReplace the accelerator pedal positionsensor assembly.
OK
Measure at accelerator pedal positionsensor connector D-135.
DDisconnect the connector, and measure at the harness side.
DVoltage between terminal 4 and earth
(Ignition switch: ON)
OK:
4 V or more
DContinuity between terminal 5 and earth
OK:
ContinuityNGCheck the following connector:
D-118
OK
Check trouble symptom.
NG
Check the harness wire between the engine-ECU and accelerator
pedal positionsensor.
OK
Check the following connector:
D-135NG
Repair
OK
Check trouble symptom.NGReplace the engine-ECU.
OK


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GDI -Troubleshooting 13A-101
Inspection procedure 29
Fuel pump (low pressure) system
Probable cause
The engine-ECU turns on the fuelpumprelay while theengine iscranking or running,
and supplies power source to the fuelpump(low pressure).DMalfunction of the fuel pumprelay
DMalfunction of the fuel pump(low pressure)
DOpen circuit or short-circuited harness wire in the fuel
pump(low pressure) circuit, or poor connector contact
DMalfunction of the engine-ECU
Check trouble symptom.NGCheck the harness wire between the
fuel pump(low pressure) and earth, and
repair if necessary.
NG
RepairOK
Check trouble symptom.NGCheck the harness wire between the
fuel pumprelay and engine-ECU, and
repair if necessary.
NG
RepairOK
NG
RepairOK
Check the ignition switch. (Refer to
GROUP 54 - Ignition Switch.)
(2) NGCheck the following connector:
F-11
MUT-
IIActuator test
07 Fuel pump(Refer to P.13A-110.)OK
Normal
NG
Check the fuelpumprelay. (Refer to
P.13A-227.)NG
Replace
OK
Measure at fuel pumprelay connector
B-27X.
DDisconnect the connector, and
measure at the harness side.
DVoltage between terminals 3, 4 and
earth
(Ignition switch: ON)
OK:
System voltageNGCheck the following connectors:
D-208, D-213, E-10NG
Repair
OK
Check trouble symptom.NGCheck the harness wire between the
fuel pumprelay and ignition switch.
OK
Measure at engine-ECU connector
D-116.
DDisconnect the connector, and
measure at the harness side.
DVoltage between terminal 21 and
earth (Ignition switch: ON)
OK:
System voltageNGCheck the following connector:
B-27X
OK
Measure at engine-ECU connector
D-116.
DDisconnect the connector, and
measure at the harness side.
DShort circuit between terminal 21
and earth (Ignition switch: ON)
OK:
The fuel pump operates(its
operation sound can be
heard).OKCheck the following connector:
D-116NG
Repair
OK
Check trouble symptom.NGReplace the engine-ECU.
NG
Measure at fuel pump(low pressure)
connector G-12.
DDisconnect the connector, and
measure at the harness side.
(1) Voltage between terminal 5 and
earth
(Ignition switch: ON)
OK:
System voltage
(2) Continuity between 4 and earth
OK:
Continuity(1) NGCheck the following connectors:
B-27X, D-124, E-13, F-11NG
Repair
OK
Check trouble symptom.NGCheck the harness wire between the
fuel pumprelay and fuelpump(low
pressure), and repair if necessary.
OK
Check the following connector:
G-12NG
Repair
OK
Check trouble symptom.
NG
Replace the fuel pump(low pressure).


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GDI -Troubleshooting 13A-102
Inspection procedure 30
Power steering fluid pressure switch system
Probable cause
The power steering fluid pressure switch sends a signal to the engine-ECU according
to power steering load.
Based on this signal, the engine-ECU controls the throttle control servo so thatidle
speed increases when the power steering is in operation.DMalfunction of the power steering fluid pressure switch
DOpen circuit or short-circuited harness wire in the power
steering fluid pressure switch circuit, or poor connector
contact
DMalfunction of the engine-ECU
NG
NG
RepairOK
Replace the engine-ECU.
NG
Repair
Check the power steering fluid pressure switch. (Refer to GROUP
37A - On-vehicle Service.)NG
Replace
OK
Measure at power steering fluid pressure switch connector B-51.
DDisconnect the connector, and measure at the harness side.
DVoltage between terminal 1 and earth
(Ignition switch: ON)
OK:
System voltageNGCheck the following connector:
D-117
OK
Check trouble symptom.
Check the harness wire between the engine-ECU and power steer-
ing fluid pressure switch.NG
RepairOK
OK
Check the following connector:
B-51
Check trouble symptom.NG
Inspection procedure 31
A/C switch and A/C relay system
Probable cause
If the engine-ECU receives a ‘A/C on’ signal, it operates the throttle control servo
and A/C compressor magnetic clutch so thatidlespeed increases.DMalfunction of the A/C control system
DMalfunction of the A/C switch
DOpen circuit or short-circuited harness wire in the A/C
switch circuit, or poor connector contact
DMalfunction of the engine-ECU
NG
NG
RepairOK
Check trouble symptom.
NG
Replace the engine-ECU.
Service the A/C compressor relay. (Refer to GROUP 55 - On-ve-
hicle Service.)NG
Replace
OK
Measure at engine-ECU connectors D-116, D-118.
DDisconnect the connector, and measure at the harness side.
DVoltage between terminals 20, 83 and earth
(Ignition switch: ON)
OK:
0-3V
(A/C switch: OFF)
System voltage
(A/C switch: ON)
DConnect terminal 20 to earth.
(Ignition switch: ON, A/C switch: ON)
OK:
A/C compressor clutch turns on.OKCheck the following connectors:
D-116, D-118
Check the A/C system. (Refer to GROUP 55 - On-vehicle Service.)


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GDI -Troubleshooting 13A-103
Inspection procedure 32
Stop lamp switch system
Probable cause
The engine-ECU determines whether the brakepedal is depressed or not, by means
of the stoplampswitch input signal.DMalfunction of the stoplampswitch
DOpen circuit or short-circuited harness wire in the stop
lampcircuit, or poor connector contact
DMalfunction of the engine-ECU
NG
NG
NG
Repair
Check the stoplampswitch. (Refer to GROUP 35 - Brake Pedal.)NG
Replace
OK
Measure at stoplampswitch connector D-136.
DDisconnect the connector, and measure at the harness side.
DVoltage between terminal 2 and earth
OK:
System voltageNG
OK
Check trouble symptom.
Check the harness wire between the battery and stoplampswitch.
NG
Repair
OK
Measure at engine-ECU connector D-117.
DDisconnect the connector, and measure at the harness side.
DVoltage between terminal 63 and earth
(Ignition switch: ON)
OK:
0 - 3 V (when the brakepedal is not depressed)
System voltage (when the brakepedal is depressed)NG
OK
Check trouble symptom.
Check the harness wire between the engine-ECU and stoplamp,
and repair if necessary.
OK
Check the following connector:
D-117NG
Repair
OK
Check trouble symptom.
NG
Replace the engine-ECU.
Check the following connectors:
D-26 , D-27, D-124

Check the following connectors:
D-26 , D-124 ,
D-128, E-13


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GDI -Troubleshooting 13A-105
DATA LIST REFERENCE TABLE
Caution
When shifting the select lever to D range, the brakes should be applied so that the vehicle does
not move forward.
NOTE
*
1: Within four minutes after starting the engine
*2: In a new vehicle [driven approximately 500 km or less], the injector drive time is sometimes 10%
longer than the standard time.
*
3: The accelerator pedal position switch normally turns off when the voltage of the accelerator pedal
position sensor (1st channel) is 200 - 600 mV higher than the voltage at the idle position. If the
accelerator pedal position switch turns back on after the accelerator pedal position sensor voltage
has risen by 100 mV and the throttle valve has opened, the accelerator pedal position switch and
the accelerator pedal position sensor (1st channel) need to be adjusted.
Item
No.Check itemsRequirementsNormal conditionInspection
procedure
No.Reference
page
11Oxygen sen-Engine: AfterIdling200 mV or lessK
1Code No.13A-28
sor
(front)warm-up
Sudden racing600 - 1,000 mV
P0130
2,500 r/min400 mV or less and
600 - 1,000 mV
alternates.
12Air flow sensorD
Engine coolant
temperature:Idling22 - 48 HzCode No.
P010013A-17
80 - 95_
C
D
Lamps, electric
cooling fan and2,500 r/min60 - 100 Hz
cooling fan and
all accessories:
OFF
D
Transmission:
Neutral
RacingFrequency in-
creases in re-
sponse to racing.
13Intake air tem-
perature sen-Ignition switch: ONIntake air tempera-
ture: - 20_
C-20_
CCode No.
P011013A-21
sor
Intake air tempera-
ture: 0_
C0_
C
Intake air tempera-
ture: 20_
C20_
C
Intake air tempera-
ture: 40_
C40_
C
Intake air tempera-
ture: 80_
C80_
C


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GDI -Troubleshooting 13A-106
Item
No.Reference
page Inspection
procedure
No. Normal condition Requirements Check items
14Throttle posi-
tion sensorDEngine coolant
temperature:Release the accel-
erator pedal.4,000 mV or moreCode No.
P022513A-52
(2nd channel)80 - 95_C
DIgnition switch:
ON (Engine
stopped)
Depress the accel-
erator pedal gradu-
ally.Voltage decreases
in response to the
pedal depression.
Depress the accel-
erator pedal fully.400 - 600 mV
16Power supply
voltageIgnition switch: ONSystem voltageProcedure
No.2513A-98
18Cranking sig-Transmission: Neu-Engine: StoppedOFFProcedure13A-99
nal (Ignition
switch - ST)tral
Engine: CrankingON
No.27
21Engine coolant
temperature
sensorIgnition switch: ONEngine coolant
temperature:
-20_C-20_CCode No.
P011513A-22
Engine coolant
temperature: 0_C0_C
Engine coolant
temperature: 20_C20_C
Engine coolant
temperature: 40_C40_C
Engine coolant
temperature: 80_C80_C
22Crank angle
sensorDEngine: crank-
ing
DTachometer:
ConnectedCompare the engine
speed readings on
the tachometer and
the MUT-II.AccordCode No.
P033513A-56
DEngine: Idling
DAccelerator
pedal positionEngine coolant
temperature:
-20_C1,250 - 1,450 r/min
switch: ON
Engine coolant
temperature: 0_C1,100 - 1,300 r/min
Engine coolant
temperature: 20_C1,000 - 1,200 r/min
Engine coolant
temperature: 40_C900 - 1,100 r/min
Engine coolant
temperature: 80_C550 - 650 r/min*1


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GDI -Troubleshooting 13A-107
Item
No.Reference
page Inspection
procedure
No. Normal condition Requirements Check items
25BarometricIgnition switch: ONAltitude: 0 m101 kPaCode No.13A-19
pressure sen-
sor
Altitude: 600 m95 kPa
P0105
Altitude: 1,200 m88 kPa
Altitude: 1,800 m81 kPa
26Accelerator
pedal positionIgnition switch: ON
(Depress and re-Release the accel-
erator pedal.ONProcedure
No.2813A-100
switchlease the accelera-
tor pedal several
times)
Depress the accel-
erator pedal slight-
ly.OFF
27Power steer-
ing fluid pres-Engine: IdlingSteering wheel sta-
tionaryOFFProcedure
No.3013A-102
sure switch
Steering wheel
turningON
28A/C switchEngine: Idling (The
A/C compressor isA/C switch: OFFOFFProcedure
No.3113A-100
A/C compressor is
running when the
A/C switch is on.)
A/C switch: ONON
No.31
31Small lamp
switchEngine: IdlingLighting switch:
OFFOFFProcedure
No.3313A-104
Lighting switch: ONON
34Air flow sensorEngine: After hav-Engine is idlingONCode No.13A-17
reset signaling warmed up
3,000 r/minOFF
P0100
37Volumetric effi-
ciencyDEngine coolant
temperature:Engine is idling20 - 40%--
80 - 95_C
DLamps, electric
cooling fan and2,500 r/min10 - 30%
cooling fan and
all accessories:
OFF
DTransmission:
Neutral
Engine is suddenly
racedVolumetric effi-
ciency increases in
response to racing
38Crank angle
sensorDEngine: Cranking [reading is possible
at 2,000 r/min or less]
DTachometer: ConnectedEngine speeds dis-
played on the
MUT-IIand
tachometer are
identical.--


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GDI -Troubleshooting 13A-108
Item
No.Reference
page Inspection
procedure
No. Normal condition Requirements Check items
41Injector drive
time *2DEngine coolant
temperature:
80 - 95_CIdling0.3 - 0.8 ms*1--
80 - 95_C
DLamps, electric
cooling fan and
all accessories:
2,500 r/min0.4 - 1.0 ms
all accessories:
OFF
DTransmission:
Neutral
Sudden racingIncreases
44Ignition
advanceDEngine: After
warm-upIdling5-20_BTDC *1Code No.
P030013A-53
advancewarm-up
DSet a timing
light.
2,500 r/min15 - 35_BTDC
P0300
49A/C relayEngine: After
warm-up, idlingA/C switch: OFFOFF (compressor
clutch is not oper-
ating)Procedure
No.3113A-102
A/C switch: ONON (compressor
clutch is operating)
59Oxygen sen-
sor (rear)DTransmission:
2nd gear
DDrive with
throttle widely
open3,500 r/min600 - 1,000 mVCode No.
P013613A-31
67Stop lamp
switchIgnition switch: ONBrake pedal: De-
pressedOFFProcedure
No.3213A-103
Brake pedal: Re-
leasedON
68EGR valveDEngine coolant
temperature:
80 - 95_C
DLamps, electricIdling2 - 20 STEPCode No.
P040313A-60
cooling fan and
all accessories:
OFF
DTransmission:
Neutral
2,500 r/min0 - 10 STEP
74Fuel pressure
sensorDEngine coolant
temperature:
80 - 95_C
DLamps, electric
cooling fan and
all accessories:
OFF
DTransmission:
NeutralEngine: Idling4 - 6.9 MPaCode No.
P019013A-36


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GDI -Troubleshooting 13A-109
Item
No.Reference
page Inspection
procedure
No. Normal condition Requirements Check items
77Accelerator
pedal positionIgnition switch: ONRelease the accel-
erator pedal.985 - 1085 mVCode
No.P122513A-68
sensor (2nd
channel)
Depress the accel-
erator pedal gradu-
ally.Increases in re-
sponse to the ped-
al depression
stroke.
Depress the accel-
erator pedal fully.4,000 mV or more
78Accelerator
pedal positionIgnition switch: ONRelease the accel-
erator pedal.985 - 1085 mVCode
No.P022013A-50
sensor (1st
channel) *3Depress the accel-
erator pedal gradu-
ally.Increases in re-
sponse to pedal
depression stroke.
Depress the accel-
erator pedal fully.4,200 - 4,800 mV
79Throttle posi-
tion sensorDEngine coolant
temperature:Release the accel-
erator pedal.400 - 800 mVCode
No.012013A-25
(1st channel)80 - 95_C
DIgnition switch:
ON (Engine
stopped)
Depress the accel-
erator pedal gradu-
ally.Increases in re-
sponse to pedal
depression stroke.
4,600 - 5,200 mV4,200 - 4,800 mV
Engine: AfterNo load450 - 1,000 mV
warm-up, idling
A/C switch: OFF®
ONIncreases by 100 -
600 mV.
99Fuel injection
modeEngine: After warm
upIdling (after four
minutes or more
have passed since
engine start)Lean compression--
2,500 r/minStoichiometric
metric feedback
Sudden racing after
idle positionOpen loop


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GDI -Troubleshooting 13A-110
ACTUATOR TEST REFERENCE TABLE
Item
No.Inspection
itemDrive contentsInspection contentsNormal conditionInspection
procedure
No.Reference
page
01InjectorsCut fuel to No. 1
injectorEngine:
After havingIdling condition
becomes differentCode No.
P020113A-38
02Cut fuel to No. 2
injector
warmed up/Engine
is idling
(Cut the fuel supply(becomes unsta-
ble).
Code No.
P020213A-40
03Cut fuel to No. 3
injectorto each injector in
turn and check
cylinders whichCode No.
P020313A-42
04Cut fuel to No. 4
injectordon’t affect idling.)Code No.
P020413A-44
05Cut fuel to No. 5
injectorCode No.
P020513A-46
06Cut fuel to No. 6
injectorCode No.
P020613A-48
07Fuel pump
(low pressure)Fuel pump
operates and
fuel is recirculated.Ignition switch: ONSound of opera-
tion is heard.Procedure
No. 2913A-101
08Purge
control
solenoid valveSolenoid valve
turns from OFF to
ON.Ignition switch: ONSound of opera-
tion can be heard
when solenoid
valve is
driven.Code No.
P044313A-62
17Basic ignition
timingSet the engine-
ECU to ignition
timing adjustment
modeIdling after engine
warm up5_BTDC--
21Condenser fanDrive the fan motorIgnition switch: ONThe fan motor
operatesProcedure
No.2113A-95
34Electronic-
controlled
throttle valve
systemStop the throttle
control servo.Ignition switch: ONThrottle valve is
opened slightly.Code No.
P122013A-64


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