2000 MITSUBISHI MONTERO compressor

GDI -Troubleshooting 13A-114
Terminal
No.Normal condition Check requirements (engine condition) Check item
63Stop lamp switchDepress the brake pedal.System voltage
Release the brake pedal.0-3V
65A/C switch (2nd channel)Refer to GROUP 55 - Troubleshooting “Check at the A/C-ECU
terminal, engine-ECU output terminals.”
66Clutch switchDepress the clutch pedal.0-3V
Release the clutch pedal.System voltage
68Ignition switch-STEngine: Cranking8V or more
71Oxygen sensor (front)Engine: Warm up, and then hold the
engine speed at 2,500r/min (Use a
digital voltmeter).0«0.8 V alternates.
76Air flow sensor reset signalEngine: Idling0-1V
Engine: 3,000 r/min6-9V
78Throttle position sensor
(2nd channel)Ignition switch:
ONRelease the
accelerator pedal.4.5 - 5.5 V
Depress the
accelerator pedal
fully.0.4 - 0.6 V
79Accelerator pedal position
switchIgnition switch:
ONRelease the
accelerator pedal.0-1V
Depress the
accelerator pedal
fully.4V or more
80Vehicle speed sensorDIgnition switch: ON
DMove the vehicle forward.0«system voltage
alternates.
83A/C switch (1st channel)Engine: IdlingA/C switch: OFF0-3V
A/C switch: ON
(Compressor is
operating)System voltage
88Small lamp switchLighting switch: OFF0-3V
Lighting switch: ON (Taillamp: ON)System voltage
89Oxygen sensor heaterEngine: Idling0-3V
(front)
Engine: 3,500 r/minSystem voltage
90Oxygen sensor heaterEngine: Idling0-3V
(rear)
Engine: 3,500 r/minSystem voltage
92Fuel pressure sensorEngine: Idling0.3 - 4.7 V


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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-201
Item
No.Reference
page Inspection
procedure
No. Normal condition Inspection contents Inspection
item
41Injector
drive time*1D
Engine: CrankingWhen engine coolant
temperature is 0_
C120 - 160 msCode No.
4113A-147
When engine coolant
temperature is 20_
C70 - 90 ms
When engine coolant
temperature is 80_
C20 - 35 ms
Injector
drive time*2D
Engine coolant
temperature: 85 -
95_
CIdling0.3 - 0.8 ms
95_
C
D
Lamps and all
accessories: OFF
D
Transmission:
2,500 r/min0.4 - 1.0 ms
D
Transmission:
P range
D
Within six minutes
after engine start-
ing
When engine is sud-
denly racedIncreases
44Ignition ad-
vance valueD
Engine: After hav-
ing warmed up
D
Timing lamp is set.
(The timing lamp is
set in order toIdling12 - 28_
BTDCCode No.
4413A-148
set in order to
check actual igni-
tion timing.)
D
Within six minutes
after engine start-
ing
2,500 r/min15 - 35_
BTDC
49A/C relayEngine: After having
warmed up, idlingA/C switch: OFFOFF (compressor
clutch is not oper-
ating)Procedure
No.3113A-194
A/C switch: ONON (compressor
clutch is operat-
ing)
67Stop lamp
switchIgnition switch: ONBrake pedal: De-
pressedOFFProcedure
No.3213A-195
Brake pedal: Re-
leasedON
68EGR valveD
Engine coolant
temperature: 85 -
95_
CIdling2 - 20 STEPProcedure
No.3513A-196
D
Lamps and all
accessories: OFF
D
Transmission: P
range
2,500 r/min0 - 10 STEP
74Fuel pres-
sure sensorD
Engine coolant
temperature: 85 -
95_
CEngine: Cranking2 MPa or moreCode No.
5613A-151
D
Lamps and all
accessories: OFF
D
Transmission: P
range
Engine: Idling4.0 - 6.9 MPa


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GDI -Troubleshooting 13A-205
Terminal
No.Normal condition Check condition (Engine condition) Check item
18Condenser fan relayCondenser fan not operatingSystem voltage
Condenser fan operating0 - 3 V or more
19Air flow sensor resetEngine: Idling0-1V
signal
Engine speed: 3,000 r/min6-9V
20A/C relayDEngine: Idling
DA/C switch: OFF to ON (Compressor operating)System voltage or
changes momentarily 6
V or more to 0 - 3 V
21Fuel pump relayIgnition switch: ONSystem voltage
Engine: Idling0-3V
22Engine warning lampIgnition switch: OFF to ONSystem voltage
23GDI ECO indication
lampIgnition switch: OFF to ON0 - 3 V (system voltage
after five seconds)
Rev the engine suddenly.System voltage
34Purge control solenoidDEngine coolantEngine: stoppedSystem voltage
valvetemperature: 80 -
95_C
DIgnition switch:
ON
Engine: After starting, in-
crease the engine speed
up to 3,500 r/minThe voltage drops
41Power supplyIgnition switch: ONSystem voltage
47
43Engine ignition signalEngine speed: 3,000 r/min0.3 - 3.0 V
44Engine coolant tem-
perature sensorIgnition switch: ONWhen engine coolant tem-
perature is 0_C3.2 - 3.8 V
When engine coolant tem-
perature is 20_C2.3 - 2.9 V
When engine coolant tem-
perature is 40_C1.3 - 1.9 V
When engine coolant tem-
perature is 80_C0.3 - 0.9 V
45Crank angle sensorEngine: Cranking0.4 - 4.0 V
Engine: Idling1.5 - 2.5 V
46Power supply voltage
applied to accelerator
pedal position sensor
(1st channel)Ignition switch: ON4.5 - 5.5 V


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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-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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DIESEL FUEL <4D5-stepIII>-General/General Information13E-2
GENERAL
OUTLINE OF CHANGE
An electronically-controlled injection pump has been added in order to comply with Regulation STEP
III. Due to this, the following service procedures have been added.
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-ECU detects an abnormality in any of the sensors or actuators, the throttle valve
is half opened to restrict the amount of intake air in order to prevent the vehicle from running away.
3. A/C Relay Control
Turns the compressor clutch of the A/C ON and OFF
4. Condenser Fan Motor Relay Control
Controls the condenser fan motor relay based on the A/C switch, engine coolant temperature and
vehicle speed input signals.
5. Glow Control
Refer to GROUP 16.
6. EGR Control
Refer to GROUP 17.


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