fuel pressure MITSUBISHI MONTERO 2000 Service Workshop Manual

GDI -Troubleshooting 13A-183
OK
Check the following items in that order.
DCheck the sparkplug
DCheck the EGR control system
DCheck the compression pressure
DCheck the fuel filter or fuelline for clogging
OK
Check ignition coil spark for each cylinder.
1. Remove the ignition coil.
2. Install a new sparkplug to the removed ignitioncoil.
3. Disconnect the injector intermediate connector.
Caution
Never touch the connector terminal as approx. 100 V is
applied to the injector, or you are seriously injured.
4. Earth the sparkplug electrodesecurely.
5. Check that the sparkplug igniteswhen theengine is
cranked.NGReplace the ignition coil.
OK
Measure fuel high-pressure between the fuel pump (high
pressure) and injector. (Refer to P.13A-222.)NGRepair
From the previouspage
Check the trouble symptoms.Replace the injector. NG
OK
MUT-
IIActuator Test
08 Purge control solenoid valve
(Refer to P.13A-203.)NGCheck the purge control solenoid valve system
(Refer to P.13A-197, Inspection procedure 36.)
Inspection procedure 14
The feeling of impact or vibration when accelerating
Probable cause
In cases such as the above, the cause is probably that there is an ignition leak
accompanying the increase in the sparkplug demand voltage during
acceleration.DMalfunction of the ignition system
Replace the ignition coil.
NG
OK
Check the trouble symptoms.
OK
Check the sparkplugNGReplace
NO
MUT-
IIData list
79 Throttle position sensor (1st channel) (Refer to P.13A-198.)NGCheck the throttle valve position feedback system
(Refer to P.13A-162, code No.92.)
MUT-
IISelf-Diag Code
Is a diagnosis code displayed?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES.


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GDI -Troubleshooting 13A-185
Inspection procedure 18
Too high CO and HC concentration when idling
Probable cause
Abnormal air-fuel ratio is suspected.DMalfunction of the air/fuel ratio control system
DDeteriorated catalyst
OK
To the nextpage
NG
Replace the ignition coil.
OK
Check ignition coil spark for each cylinder.
1. Remove the ignition coil.
2. Install a new sparkplug to the removed ignitioncoil.
3. Disconnect the injector intermediate connector.
Caution
Never touch the connector terminal as approx. 100 V is applied to the injector, or you are seriously injured.
4. Earth the sparkplug electrodesecurely.
5. Check that the sparkplug igniteswhen theengine iscranked.NG
NG
Measure fuel high -pressure between the fuelpump (high
pressure) and injector. (Refer to P.13A-223.)
Check the trouble symptoms.
OK
MUT-
IIData list
11 Oxygen sensor (Refer to P.13A-198.)
OK:
Repeat 0 - 400 mV and 600 - 1,000 mV alternately
during idling(wait for at least 2 minutes after the
enginestarted to run at idle).OKReplace the oxygen sensor.
OK
MUT-
IIData list
11 Oxygen sensor (Refer to P.13A-198.)
OK:
600 - 1,000 mV when theengine is suddenlyracedNGCheck the oxygen sensor system. (Refer to P.13A-131, code
No.11.)
OK
MUT-
IIActuator Test
08 Purge control solenoid valve
(Refer to P.13A-203.)NGCheck the purge control solenoid valve system
(Refer to P.13A-197, Inspection procedure 36.)
OK
MUT-
IIData list
68 EGR valve (Refer to P.13A-198.)NGCheck the EGR valve system (Refer to P.13A-196, Inspection
procedure 35.)
OK
MUT-
IIData list
25 Barometric pressure sensor (Refer to P.13A-198.)NGCheck the barometric pressure sensor system (Refer to
P.13A-145, code No.25.)
OK
MUT-
IIData list
13 Intake air temperature sensor (Refer to P.13A-198.)NGCheck the intake air temperature sensor system (Refer to
P.13A-135, code No.13.)
OK
MUT-
IIData list
21 Engine coolant temperature sensor (Refer to P.13A-198.)NGCheck theengine coolant temperaturesensor system (Refer
to P.13A-138, code No.21.)
NO
Check the ignition timing. (Refer to GROUP 11A - Engine
Adjustment.)NGCheck that the crankanglesensor andtiming beltcover are
properly installed.
MUT-
IISelf-Diag Code
Are diagnosis codes displayed?YESRefer to P.13A-130, INSPECTION CHART FOR DIAGNOSIS
CODES.


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GDI -Troubleshooting 13A-193
Inspection procedure 29
Fuel pump (low pressure) system
Probable cause
The engine-A/T-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)
DImproper connector contact,opencircuit or
short-circuited harness wire
DMalfunction of the engine-A/T-ECU
Check the ignition switch (Refer to
GROUP54 - Ignition Switch.)
NG
Repair
OK
OK
NG
OK
Check the trouble symptoms.NGReplace the fuel pump(low
pressure).
NG
Replace the engine-A/T-ECU.OKRepair
OK
Normal
NG
Repair
NG
Check the harness wire between the
fuel pumprelay and the fuelpump
(low pressure). NG
(1) NG
NG
NG
Check the harness wire between the
fuel pump(low pressure) and earth,
and repair if necessary.
(2) NG
NG
NG
NG
Repair
OK
OK
Check the following connector:
G-12NG
Repair
Check the trouble symptoms.
Check the following connector
:
F-11
OK
Check the trouble symptoms.
Check the following connectors:
B-27X, D-124, E-17, F-11Measure at fuel pump(low pressure)
connector G-12.
DDisconnect the connector, and
measure at the harness side.
(1) The voltage between terminal 5
and earth
(Ignition switch: ON)
OK:
System voltage
(2) The continuity between terminal 4
and earth
OK:
Continuity
Check the trouble symptoms.
OK
Measure at the engine-A/T-ECU
connector D-119.
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-119
OK
Measure at the engine-A/T-ECU
connector D-119.
DDisconnect the connector, and
measure at the harness side.
DThe voltage between terminal 21
and earth
(Ignition switch: ON)
OK:
System voltageNGCheck the harness wire between the
fuel pumprelay and the
engine-A/T-ECU, and repair if
necessary.
Check the harness wire between the
fuel pumprelay and the ignition
switch.
OK
Check the trouble symptoms.
Check the following connectors:
D-208, D-213, E-10Measure at the fuel pumprelay
connector B-27X.
DDisconnect the connector, and
measure at the harness side.
DThe voltage between terminal 3,
4 and earth
(Ignition switch: ON)
OK:
System voltage
OK
Check the fuelpumprelay (Refer to
P.13A-227.)NG
Replace
MUT-
IIActuator Test
07 Fuel pump
(Refer to P.13A-203.)
Repair


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GDI -Troubleshooting 13A-203
ACTUATOR TEST REFERENCE TABLE
Item
No.Inspection
itemDrive ContentsInspection contentsNormal condi-
tionInspec-
tion pro-
cedure
No.Reference
page
01InjectorCut fuel to the
No.1 injector.Engine:
Idling after warming-upIdling condition
becomes differ-Code
No. 4113A-147
02Cut fuel to the
No.2 injector.
(Cut the fuel supply to each
injector in turn and check
cylinders which does notent (becomes
unstable, or the
engine stalls).
03Cut fuel to the
No.3 injector.affect idling.)
04Cut fuel to the
No.4 injector.
05Cut fuel to the
No.5 injector.
06Cut fuel to the
No.6 injector.
07Fuel pump
(low-pres-
sure)Operates the
fuel pump (low-
pressure) to cir-
culate fuel.Ignition
switch:
ONPinch the return
hose with fin-
gers to feel the
pulse of the fuel
being circulated.Pulse is felt.Proce-
dure
No.2913A-193
Operating
sound can be
heard around
the fuel tank.Sound of opera-
tion can be
heard
08Purge con-
trol solenoid
valveSolenoid valve
turns from OFF
to ON.Ignition switch: ONSound of opera-
tion can be
heard when so-
lenoid valve is
driven.Proce-
dure
No.3613A-197
17Basic ignition
timingSolenoid valve
turns from OFF
to ON.DEngine: Idling
DSet a timing light.
5_BTDC--
21Condenser
fanDrive the fan
motorDIgnition switch: ON
DA/C switch: ON
Fan motor runsProce-
dure
No.2113A-187
34Electronic-
controlled
throttle valve
systemStop the throttle
control servoIgnition switch: ONThe throttle
valve opens
slightlyCode
No. 9113A-161


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GDI -Troubleshooting 13A-207
Terminal
No.Normal condition Check condition (Engine condition) Check item
78Throttle position sen-
sor (2nd channel)Ignition switch: ONRelease the accelerator
pedal.4.0 V or higher
Depress the accelerator
pedal fully.0.4 - 0.6 V
79Accelerator pedal posi-
tion switchIgnition switch: ONRelease the accelerator
pedal.0-1V
Depress the accelerator
pedal slightly.4 V or more
80Vehicle speed sensorDIgnition switch: ON
DMove the vehicle slowly forwardVoltages of 0 and 8 - 12
V alternate (changes
repeatedly)
83A/C switch 1Engine: IdlingA/C switch: OFF0-3V
A/C switch: ON (Com-
pressor is operating)System voltage
86Small lamp switchLighting switch: OFF0-3V
Lighting switch: Tail light positionSystem voltage
87Sensor applied voltageIgnition switch: ON4.5 - 5.5 V
93Fuel pressure sensorEngine: Idling0.3 - 4.7 V
95Accelerator pedal posi-
tion sensor (1st chan-Ignition switch: ONRelease the accelerator
pedal.0.985 - 1.085 V
nel)
Depress the accelerator
pedal fully.4.0 V or higher
98Ignition switch-IGIgnition switch: ONSystem voltage
123Stop lamp switchDepress the brake pedal.System voltage
Release the brake pedal.0-3V


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GDI -Injector13A-238
NOTE
When removing the fuel pump (high pressure), air may
get into the fuel pump (high pressure). If air gets into
the fuel pump (high pressure), diagnosis code No.56 for
abnormal fuel pressure will be output.
2. Use the MUT-IIto check the diagnosis code. If the
diagnosis code No.56 for fuel pressure sensor system
defect is output, erase it.


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GDI -Fuel Pump (High Pressure)13A-241
"
CA
O-RING/FUEL PRESSURE HOSE INSTALLATION
1. Apply a small amount of fresh engine oil to the O-ring.
Caution
Take care not to let any of the engine oil get inside
the fuel pump (high pressure) or the delivery pipe
assembly.
2. While being careful not to damage the O-ring, turn the
fuel pressure hose to the left and right and connect it
to the delivery pipe assembly. After connecting, check
that the fuel injector turns smoothly.
3. If the fuel pressure hose does not turn smoothly, the cause
may be that the O-ring is getting caught. Remove the fuel
pressure hose, check the O-ring for damage and
re-connect the fuel pressure hose to the delivery pipe
assembly and then re-check.


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15
DRIVE CYCLE
Performing the running test of the car using the following five drive cycle patterns makes it possible to
monitor all the diagnosis codes that are required for operation of the car in order to determine if the
applicable system is operating properly or not.
In other words, doing such a drive allows to regenerate any kind of trouble which involves illuminating the
Engine Warning Lamp (Check Engine Lamp) and to verify the repair procedure has eliminated the trouble
[the Engine Warning Lamp (Check Engine Lamp) is no longer illuminated].
Caution
Two technicians should always be in the vehicle when carrying out a test drive.
NOTE
Check that the diagnosis code is not output before traveling in the Drive cycle pattern. Erase the diagnosis
code if it has been output.
DRIVE CYCLE PATTERN LIST
PROCEDURE MONITOR ITEM DIAGNOSIS CODE
Catalytic converter monitor P04201
Heated oxygen sensor monitor P0130
2 Fuel trim monitor P0170
3 Feed back monitor P0125
4 Other monitor P0136, P0201, P0202, P0203, P0204, P0205,
P0206, P0300, P0301, P0302, P0303, P0304,
P0305, P0306, P0325
NOTE
The vehicle speed sensor (P0500) and the power steering fluid pressure switch (P0551) are used to
determine if the system is operating properly or not through use of the Data List function of the MUT-II.
2001 PAJERO/MONTERO WAGON Workshop Manual 6G74
GDI - Troubleshooting

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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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DIESEL FUEL <4M4> -Troubleshooting13C-6
FAIL-SAFE, BACKUP FUNCTIONS
When abnormalities in the major sensors are detected by diagnosis functions, pre-set control logic operates
to maintain a safe driving condition for the vehicle.
Diagnosis itemControl features in malfunction
Accelerator pedal position sensorD
Accelerator pedal released (idle switch ON)
Acceleration opening degree = 0%
D
Accelerator pedal applied (idle switchOFF)
Engine controlled at low speed
Acceleration opening degree = 20% fixed
Idle switchD
Void idling speed control.
D
Void cruise control.
Engine speed sensorD
Engine controlled at low speed
D
Void cruise control.
Boost air temperature sensorMaintain the intake air temperature at 50_
C.
Vehicle speed sensorD
Void idling speed control.
D
Void cruise control.
Engine coolant temperature sensorMaintain the engine coolant temperature at 80_
C.
Control sleeve position sensorD
Engine controlled at low speed
D
Void cruise control.
Timer piston position sensorD
Injection timing stabilizing control
D
Void cruise control.
Barometric pressure sensor (ECU
built-in)Keep the barometric pressure at 101 kPa.
Fuel temperature sensorMaintain the fuel temperature at 50_
C.
Boost pressure sensorKeep the boost pressure as barometric pressure (101 kPa).
Injection correction ROMVoid correction.
GE actuatorD
Engine controlled at low speed
D
Void cruise control.
Over boostVoid cruise control.
Timing control valveD
Injection timing stabilizing control
D
Void cruise control.


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