ESP MITSUBISHI MONTERO 2000 Service Owner's Manual

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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GDI -Troubleshooting 13A-115
Terminal
No.Normal condition Check requirements (engine condition) Check item
94Accelerator pedal position
sensor (1st channel)Ignition switch:
ONRelease the acceler-
ator pedal.0.3 - 1.0 V*1
Depress the
accelerator pedal
fully.4.2 - 5.5 V*2
96Injector open circuit check
signalEngine: Increase engine speed from
idle speed to 4,000 r/min.Decreases slightly (approx.
0.7V) from 4.5 V - 5.0 V.
99Ignition switch - IGIgnition switch: ONSystem voltage
NOTE
Check if the difference in output between *1 and *2 is 4 V or more.
CHECK CHART FOR RESISTANCE AND CONTINUITY
BETWEEN TERMINALS
1. Turn the ignition switch to OFF.
2. Disconnect the engine-ECU connector.
3. Measure the resistance and check for continuity between
the terminals of the engine-ECU harness-side connector
while referring to the check chart.
NOTE
(1) When measuring resistance and checking continuity,
a harness for checking contact pin pressure should
be used instead of inserting a test probe.
(2) Checking need not be carried out in the order given
in the chart.
Caution
If the terminals that should be checked are mistaken,
or if connector terminals are not correctly shorted
to earth, damage may be caused to the vehicle wiring,
sensors, engine-ECU and/or ohmmeter.
Be careful to prevent this!
4. If the ohmmeter shows any deviation from the standard
value, check the corresponding sensor, actuator and
related electrical wiring, and then repair or replace.
5. After repair or replacement, recheck with the ohmmeter
to confirm that the repair or replacement has corrected
the problem.


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GDI -Troubleshooting 13A-147
Code No.41 Injector systemProbable cause
Range of Check
DThe enginespeed is 4,000 r/min or less.
DThe battery voltage is 10 V or more.
DThe fuel cut operation or the injector operation (by carrying out the Actuator
Test) is not in progress.
Set Conditions
DThe injector driver is not transmitting a injectoropencircuit check signal for
four seconds.DMalfunction of injector
DOpen or short circuit in the injector circuit or loose
connector contact
DMalfunction of engine-A/T-ECU
NG
Check the following connector:
B-105NG
Repair
OK
NG
Repair
MUT-
IIActuator Test
01 No.1 injector
02 No.2 injector
03 No.3 injector
04 No.4 injector
05 No.5 injector
06 No.6 injector
OK:
The idling condition should
change.OKCheck the trouble symptoms.OKTransient malfunction
(Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
NG
Replace the injector driver.
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
Measure at intermediate connector
B-105.
DDisconnect the connector and
measure at the harness side.
DResistance between terminals 11
and 12
Resistance between terminals 5
and 6
Resistance between terminals 9
and 10
Resistance between terminals 3
and 4
Resistance between terminals 7
and 8
Resistance between terminals 1
and 2
OK:
0.9 - 1.1WNGCheck the following connectors:
B-117 , B-114 injector>, B-118 ,
B-115 , B-103 injector>, B-104 NG
Repair
OK
Replace the injector.
Check the following connector:
B-121NG
Repair
OK
Check the harness wire between the
injector driver and the intermediate
connector.NG
Repair
OK
Check the following connector:
D-119NG
Repair
OK
Check the harness wire between the
injector driver and the
engine-A/T-ECU.NG
Repair
OK
To the nextpage
Check the harness wire between
injector and the intermediate
connector.
OK


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GDI -Troubleshooting 13A-191
Inspection procedure 27
Ignition switch-ST and inhibitor switch system
Probable cause
The ignition switch-ST inputs a HIGH signal to the engine-A/T-ECU while the
engine iscranking. The engine-A/T-ECU controls fuel injection, etc. during
starting based on this input.
The inhibitor switch inputs the position of the selector lever to the
engine-A/T-ECU. The engine-A/T-ECU uses this signal to carry outidlespeed
control.DMalfunction of the ignition switch
DMalfunction of the inhibitor switch
DOpen circuit or short-circuited harness wire
between the ignition switch and the inhibitor
switch, or improper connector contact.
DMalfunction of the engine-A/T-ECU
OK
Check the following connector:
D-120
OK
Ignition switch check
(Refer to GROUP 54 - Ignition Switch.)
OK
Check the trouble symptoms.
OK
Check the trouble symptoms.
MUT-
IIData list
Confirm the data list concerning the A/T system.
61 Inhibitor switch
(Refer to GROUP 23 - Troubleshooting.)NGCheck the inhibitor switch system.
(Refer to GROUP 23 - Troubleshooting.)
OK
Measure at engine-A/T-ECU connector D-120.
DDisconnect the connector, and measure at the harness
side.
DThe voltage between terminal 58 and earth
(Selector lever position: P or N)
(Ignition switch: START)
OK:
System voltageNGCheck the following connector:
C-05
NG
Repair
NG
Check the harness between the inhibitor switch and the
ignition switch.
OK
Check the trouble symptoms.
NG
Repair
OK
Check the inhibitor switch.
DThe continuity between terminals 9 and 10 (Refer to
GROUP 23 - On-vehicle Service.)NGReplace
NG
Replace the engine-A/T-ECU.
NG
Repair
NG
Check the harness wire between the inhibitor switch and the
engine-A/T-ECU, and repair if necessary.
OK
Measure at inhibitor switch connector C-05.
DDisconnect the connector, and measure at the harness
side.
DThe voltage between terminal 10 and earth (Ignition switch:
ON)
OK:
System voltageNGCheck the following connector:
E-114
NG
Repair


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GDI -Troubleshooting 13A-192
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-A/T-ECU. The engine-A/T-ECU uses
this signal to carry outidlespeed control.DMaladjustment of the accelerator pedal position
switch and the acceleratorpedal positionsensor.
DOpen circuit or short-circuited harness wire in the
accelerator pedal positionswitch system, or poor
connector contact
DMalfunction of the engine-A/T-ECU
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
Check the acceleratorpedal position
switch. (Refer to P.13A-230.)NGReplace the accelerator pedal
position sensor.
OK
Measure at accelerator pedal position
sensor connector D-135.
DDisconnect the connector, and
measure at the harness side.
DThe voltage between terminal 4
and earth
(Ignition switch: ON)
OK:
4 V or more
DThe continuity between terminal 5
and earth
OK:
ContinuityNGCheck the following connector:
D-121NG
Repair
OK
Check the trouble symptoms.
NG
NG
Check the harness wire between the
engine-A/T-ECU and the accelerator
pedal positionsensor.Repair
OK
Check the following connector:
D-135NG
Repair


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GDI -Troubleshooting 13A-194
Inspection procedure 30
Power steering fluid pressure switch system
Probable cause
The presence or absence of power steeringload is input to the engine-A/T-ECU.
Based on this signal, the engine-A/T-ECU controls the throttle control servo so
that idlespeed increases when the power steering is in operation.DMalfunction of the power steering fluid pressure
switch.
DImproper connector contact,opencircuit or
short-circuited harness wire
DMalfunction of the engine-A/T-ECU
OK
Measure at power steering fluid
pressure switch connector B-51.
DDisconnect the connector, and
measure at the harness side.
DThe voltage between terminal 1
and earth
(Ignition switch: ON)
OK:
System voltageNGCheck the following connector:
D-120NG
Repair
OK
Check the trouble symptoms.
NG
Check the harness wire between the
engine-A/T-ECU and the power
steering fluid pressure switch, and
repair if necessary.OK
Check the following connector:
B-51NG
Repair
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
Check the power steering fluid
pressure switch (Refer to GROUP
37A - On-vehicle Service.)NG
Replace
Inspection procedure 31
A/C switch and A/C relay system
Probable cause
When an A/C ON signal is input to the engine-A/T-ECU, the engine-A/T-ECU
controls the throttle control servo so thatidlespeed increases, and also operates
the A/C compressor magnetic clutch.DMalfunction of the A/C control system
DMalfunction of the A/C switch
DImproper connector contact,opencircuit or
short-circuited harness wire
DMalfunction of the engine-A/T-ECU
Service the A/C compressor relay.
(Refer to GROUP 55 - On-vehicle
Service.)NG
Replace
OK
Measure at engine-A/T-ECU
connectors D-119, D-121.
DDisconnect the connector, and
measure at the harness side.
DThe voltage between terminal 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-119, D-121NG
Repair
OK
Check the trouble symptoms.
NG
Replace the engine-A/T-ECU.
NG
Check the A/C system (Refer to
GROUP 55 - Troubleshooting.)


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GDI -Troubleshooting 13A-199
Item
No.Reference
page Inspection
procedure
No. Normal condition Inspection contents Inspection
item
14Throttle
positionDEngine: After hav-
ing warmed upRelease the acceler-
ator pedal.4,000 mV or moreCode No.
1413A-137
sensor (2nd
channel)DIgnition switch: ON
(Engine: Stopped)
Depress the acceler-
ator pedal gradually.Voltage
decreases in
response to the
pedal depression.
Depress the acceler-
ator pedal fully.400 - 600 mV
16System
voltageIgnition switch: ONSystem voltageProcedure
No. 2513A-190
18Cranking
signal (igni-Ignition switch: ONEngine: StoppedOFFProcedure
No.2713A-191
signal (igni-
tion switch:
ST)
Engine: CrankingON
No.27
21Engine cool-
ant temper-
ature sensorIgnition switch: ON or
with engine runningWhen engine coolant
temperature is
-20_
C-20_
CCode No.
2113A-138
When engine coolant
temperature is 0_
C0_
C
When engine coolant
temperature is 20_
C20_
C
When engine coolant
temperature is 40_
C40_
C
22Crank angle
sensorDEngine: Cranking
DTachometer: Con-
nectedCompare the
tachometer with the
MUT-IIreading.IdenticalCode No.
2213A-140
DEngine: Idling
DIdle position
switch: ON
DWithin six minutesWhen engine coolant
temperature is
-20_
C1,250 - 1,450
r/min
DWithin six minutes
after engine
starting (Onlywhen
engine coolant
When engine coolant
temperature is 0_
C1,100 - 1,300
r/min
engine coolant
temperature is
80
_C)
When engine coolant
temperature is 20_
C1,000 - 1,200
r/min
When engine coolant
temperature is 40_
C900 - 1,100 r/min
When engine coolant
temperature is 80_
C550 - 650 r/min


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GDI -Troubleshooting 13A-200
Item
No.Reference
page Inspection
procedure
No. Normal condition Inspection contents Inspection
item
25BarometricIgnition switch: ONAt altitude of 0 m101 kPaCode No.13A-145
pressure
sensor
At altitude of 600 m95 kPa
25
At altitude of 1,200 m88 kPa
At altitude of 1,800 m81 kPa
26Accelerator
pedal posi-Ignition switch: ON
(Depress and re-Release the acceler-
ator pedal.ONProcedure
No.2813A-192
tion switchlease the accelerator
pedal several times)
Depress the acceler-
ator pedal slightly.OFF
27Power
steering
fluid pres-
sure switchEngine: IdlingWhen steering wheel
is turnedONProcedure
No.3013A-194
28A/C switchEngine: Idling
(The A/C compres-A/C switch: OFFOFFProcedure
No.3113A-194
(The A/C compres-
sor is running when
the A/C switch is on.)
A/C switch: ONON
No.31
31Small lampEngine: IdlingLighting switch: OFFOFFProcedure13A-195
switch
Lighting switch: ONON
No.33
34Air flow sen-Engine: After havingIdlingONCode No.13A-133
sor reset
signalwarmed up
3,000 r/minOFF
12
37VolumetricDEngine coolantIdling20 - 40%--
efficiencytemperature: 85 -
95
_C
Lamps and all
2,500 r/min10 - 30%DLamps and all
accessories: OFF
DTransmission: P
range
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
displayed on the
MUT-IIand
tachometer are
identical.--


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GDI -Troubleshooting 13A-208
CHECK CHART FOR RESISTANCE AND CONTINUITY
BETWEEN TERMINALS
1. Turn the ignition switch to OFF.
2. Disconnect the engine-A/T-ECU connector.
3. Measure the resistance and check for continuity between
the terminals of the engine-A/T-ECU harness-side
connector while referring to the check chart.
NOTE
(1) When measuring resistance and checking continuity,
a harness for checking contact pin pressure should
be used instead of inserting a test probe.
(2) Checking need not be carried out in the order given
in the chart.
Caution
If the terminals that should be checked are mistaken,
or if connector terminals are not correctly shorted
to earth, damage may be caused to the vehicle wiring,
sensors, engine-A/T-ECU and/or ohmmeter.
Be careful to prevent this!
4. If the ohmmeter shows any deviation from the standard
value, check the corresponding sensor, actuator and
related electrical wiring, and then repair or replace.
5. After repair or replacement, recheck with the ohmmeter
to confirm that the repair or replacement has corrected
the problem.


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DIESEL FUEL <4M4> -General Information13C-2
GENERAL INFORMATION
The electronically-controlled fuel injection system consists of sensors which detect the condition of the
diesel engine, an engine-ECU which controls the system based on signals from these sensors, and actuators
which operate according to control commands from the engine-ECU.
The engine-ECU carries out operations such as fuel injection rate control, fuel injection timing control
and idle up control. In addition, the engine-ECU is equipped with several self-diagnosis functions which
make troubleshooting easier in the event that a problem develops.
FUEL INJECTION RATE CONTROL
The fuel injection completion timing is controlled by means of a solenoid-type spill valve to ensure that
the optimum amount of fuel is supplied to the engine in accordance with gradual changes in the engine
running condition.
Before fuel injection starts, the solenoid-type spill valve is on (energized), so that the valve is closed.
As the plunger turns and rises, fuel is sent out under pressure, and when the fuel flow rate reaches
the target value for fuel injection, the solenoid-type spill valve turns off. When the solenoid-type spill
valve turns off, the fuel under high pressure inside the plunger is leaked out into the pump chamber
and fuel injection is completed.
FUEL INJECTION TIMING CONTROL
The position of the injection pump timer piston is controlled so that fuel injection is carried out at the
optimum timing in accordance with the engine running condition.
The timer piston position is determined by duty control of the timing control solenoid valve which is located
in the line between the high-pressure chamber and the low-pressure chamber of the timer piston.
The fuel injection timing is advanced by increasing the control duty of the timing control solenoid valve.
IDLE SPEED CONTROL
Controlling the fuel injection rate in accordance with the engine running condition maintains the idle speed
at the optimum condition.
SELF-DIAGNOSIS FUNCTION
DWhen an abnormality is detected in any of the sensors or actuators, the engine warning lamp illuminates
to warn the driver.
DWhen an abnormality is detected in any of the sensors or actuators, a diagnosis code number
corresponding to the problem which occurred is output.
DThe RAM data relating to the sensors and actuators which is stored in the engine-ECU can be read
using the MUT-II. In addition, the actuators can be force-driven under certain conditions.
OTHER CONTROL FUNCTIONS
1. Power Supply Control
When the ignition switch is turned to ON, the relay turns on and power is supplied to components
such as the timing control solenoid valve.
2. Intake Air Throttle Control
When the engine is idling after having warmed up, the throttle valve is half opened to restrict the
amount of intake air in order to reduce vibration and noise.
3. A/C Relay Control
Turns the compressor clutch of the A/C ON and OFF
4. Fan motor relay control
The radiator fan and condenser fan operating speeds are controlled in accordance with the engine
coolant temperature and the vehicle speed.
5. Glow Control
Refer to GROUP 16.
6. EGR Control
Refer to GROUP 17.


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