2000 MITSUBISHI MONTERO ECO mode

GENERAL -How to Use Troubleshooting/Inspection Service Points00-10
HOW TO USE THE INSPECTION PROCEDURES
The causes of a high frequency of problems occurring in electronic circuitry are generally the connectors,
components, the ECU and the harnesses between connectors, in that order. These inspection procedures
follow this order, and they first try to discover a problem with a connector or a defective component.
D
Indicator does not turn on or off even if control
mode switch is pressed.
D
Indicator switch should not be illuminated is
illuminated.Probable cause
OK
OK
OK
Measure at switch connector A-44
DDisconnect the connector, and measure at the harness
side.
DVoltage between terminal 6 - earth and terminal 8 -
earth
OK:Approx. 5V
OK
NG
Check the following connector.A-44
Repair
OK
Check trouble symptom.
Replace the ECS-ECU.
In the above cases, the ECS switch circuit is defective or the indicator
circuit is defective.
CHECKING PROCEDURE 4
2. Indicates inspection carried out using the
MUT-
II.
Indicates the operation and inspection proce-
dures.
Indicates the OK judgement conditions.
3. Detailed inspection procedures (methods)
such as component inspection andcircuit
inspection are listed on a separate page, and
are given here for reference.
5. Inspect the contact condition at each connectorterminal.
(Refer to Connector Inspection Service Points.)
The connector position can be located in the wiring diagram in the
electrical wiring manual bymeans ofthis symbol.
Caution
After carrying out connector inspection, always be sure to
reconnect the connector as it was before.
6. Confirm that there are trouble symptoms. If trouble symptomshave
disappeared, the connector may have been inserted incorrectly and the
trouble symptom mayhave disappeared during inspection.
If it seemsthat trouble symptoms still remain, proceed to the nextpage of
instructions.
7. If trouble symptoms still remain up to this stage, there is a possibility that there is an
open orshort circuit in the harness between the connectors, socheck the harness.
Alternatively, the cause may be a defectiveECU, so try replacing the ECU andcheck
if the trouble symptom disappears.
NGECU switch component inspection (Refer to P.33-44.)
NG
1. Comments on the diagnosis code ortrouble
symptom above.
MUT-II
Data list
17 Control mode selectionswitch
OK:Voltage changes between approx. 0V
®approx.
2.5V
®approx. 5V when the switch is operated.
4. Indicates voltage and resistance to be measured at a particular
connector.
(Refer to Connector Measurement Service Points.)
The connector position can be located in the wiring diagram in the
electrical wiring manual bymeans ofthis symbol.
Indicates operation and inspection procedures, inspection terminals
and inspection conditions.
Indicates the OK judgement conditions.
HARNESS INSPECTION
Check for an open or short circuit in the harness between the terminals which were defective according
to the connector measurements. Carry out this inspection while referring to the electrical wiring manual.
Here, “Check harness between power supply and terminal xx” also includes checking for blown fuses.
For inspection service points when there is a blown fuse, refer to “Inspection Service Points for a Blown
Fuse.”
MEASURES TO TAKE AFTER REPLACING THE ECU
If the trouble symptoms have not disappeared even after replacing the ECU, repeat the inspection procedure
from the beginning.


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GDI -General Information13A-3
GENERAL INFORMATION
The Gasoline Direct Injection System consists
of sensors which detect the engine conditions,
the engine-ECU or engine-A/T-ECU
which controls the system based on
signals from these sensors, and actuators
which operate under the control of the
engine-ECU or engine-A/T-ECU .The engine-ECU or engine-A/T-ECU
carries out activities such as fuel injection
control, idle speed control and ignition timing
control. In addition, the engine-ECU or
engine-A/T-ECU is equipped with several
diagnosis modes which simplify troubleshooting
when a problem develops.
FUEL INJECTION CONTROL
The injector drive times and injector timing are
controlled so that the optimum air/fuel mixture
is supplied to the engine to correspond to the
continually-changing engine operation condi-
tions.
A single injector for each cylinder is mounted
at the cylinder head. The fuel is sent under
pressure from the fuel tank to the fuel pressure
regulator (low pressure) by the fuel pump (low
pressure). The pressure is regulated by the
fuel pressure regulator (low pressure) and the
fuel regulated is then sent to the fuel pump
(high pressure). The fuel under increased
pressure generated by the fuel pump (high
pressure) is then regulated by the fuel pressure
regulator (high pressure) and is then distributed
to each of the injectors via the delivery pipes.Fuel injection is normally carried out once for
each cylinder for every two rotations of the
crankshaft. The firing order is 1-2-3-4-5-6. This
is called sequential fuel injection.
When the engine is cold or under a severe
load, the “open-loop” control keeps the air/fuel
ratio at a richer than usual level to maintain
driveability. When the engine is under low or
medium loads, the air/fuel ratio becomes leaner
to reduce fuel consumption. When the engine
is running at medium or high loads after having
warmed up, the “closed-loop” control uses the
signal from the oxygen sensor to keep the
air/fuel ratio at the optimum theoretical level.
THROTTLE VALVE OPENING ANGLE CONTROL
This system controls throttle valve opening
angle electronically. The engine-ECU
or engine-A/T-ECU determines how
deeply the accelerator pedal is depressed by
means of the accelerator position sensor (APS).
Then the engine-ECU or engine-A/T-ECU sends a target value of the
throttle valve opening angle to the throttle valve
controller. The throttle valve control servo
operates the throttle valve so that it reaches
the target opening angle.
IDLE SPEED CONTROL
This system maintains engine idle speed at
a predetermined condition by controlling the
air flow that passes through the throttle valve
according to engine idling condition and engine
loads at idling.
The engine-ECU or engine-A/T-ECU
operates the throttle valve control servoso that engine speed is maintained within a
map value. The map value is predetermined
according to engine coolant temperature and
air-conditioning load.
IGNITION TIMING CONTROL
The power transistor located in the ignition
primary circuit turns ON and OFF to control
the primary current flow to the ignition coil. This
controls the ignition timing in order to provide
the optimum ignition timing with respect to the
engine operating conditions. The ignition timingis determined by the engine-ECU or
engine-A/T-ECU from the engine speed,
intake air volume, engine coolant temperature,
atmospheric pressure and injection timing
(intake stroke or compression stroke).


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GDI -General Information13A-4
SELF-DIAGNOSIS FUNCTION
DWhen an abnormality is detected in one
of the sensors or actuators related to
emission control, the engine warning lamp
(check engine lamp) illuminates or flashes
as a warning to the driver.
DWhen an abnormality is detected in one
of the sensors or actuators, a diagnosis
code corresponding to the abnormality is
output.
DThe engine-ECU records the engine
operating condition when the diagnosis
code is set. This data is called “freezeframe” data.
This data can be read by using the MUT-II,
and can then be used in simulation tests
for troubleshooting. M/T>
DThe RAM data inside the engine-ECU
or engine-A/T-ECU that is
related to the sensors and actuators can
be read by means of the MUT-II. In addition,
the actuators can be force-driven under
certain circumstances.
OTHER CONTROL FUNCTIONS
1. Fuel Pump Control
Turns the fuel pump relay ON so that current
is supplied to the fuel pump while the engine
is cranking or running.
2. A/C Relay Control
Turns the compressor clutch of the A/C
ON and OFF.3. Purge Control Solenoid Valve Control
Refer to GROUP 17.
4. EGR Control Servo Control
Refer to GROUP 17.
GENERAL SPECIFICATIONS
ItemsSpecifications
Throttle bodyThrottle bore mm65
Throttle position sensorVariable resistor type
Throttle valve control servoBrushless DC-motor type
Engine-ECUIdentification model No.E2T79271 Engine-ECU
Identification model No.E2T79271
E2T79272
Engine-Identification model No.E2T76277
A/T-ECU
E2T76278


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GDI -Troubleshooting 13A-11
4. Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates
the sensor mounted at the position second closest to the engine.
METHOD OF READING AND ERASING DIAGNOSIS
CODES
Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points.
DIAGNOSIS USING DIAGNOSIS 2 MODE
1. Switch the diagnosis mode of the engine control unit
to DIAGNOSIS 2 mode using the MUT-II.
2. Carry out a road test.
3. Take a reading of the diagnosis code and repair the
problem location.
4. Turn the ignition switch to OFF and then back to ON
again.
NOTE
By turning the ignition switch to OFF, the ENGINE-ECU will
switch the diagnosis mode from DIAGNOSIS 2 mode to
DIAGNOSIS 1 mode.
5. Erase the diagnosis codes.
INSPECTION USING MUT-II
DATA LIST AND
ACTUATOR TESTING
1. Carry out inspection by means of the data list and the
actuator test function. If there is an abnormality, check
and repair the chassis harnesses and components.
2. After repairing, re-check using the MUT-IIand check that
the abnormal input and output have returned to normal
as a result of the repairs.
3. Erase the diagnosis code memory.
4. Remove the MUT-II, and then start the engine again and
carry out a road test to confirm that the problem has
disappeared.


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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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ENGINE AND EMISSION CONTROL -EngineControlSystem/EmissionControl
System <4D5-Step III>17-2
ENGINE CONTROL SYSTEM
GENERAL
OUTLINE OF CHANGE
Electronic-controlled throttle valve system has been used instead of a conventional cable-type accelerator
mechanism <4D5>.
Its service procedure is the same as for previous models with 6G7 or 4M4 engine.
EMISSION CONTROL SYSTEM <4D5-STEP
III>
GENERAL
OUTLINE OF CHANGES
Some service procedures have been established as the following changes have been made due to the
compliance with the Emission Regulation Step III.
DAn electronic-controlled EGR valve and EGR cooler have been used.
DA catalytic converter has been added.
GENERAL INFORMATION
The electronically-controlled EGR system reduces
the level of exhaust gases (NO
x).
ItemsNameSpecification
Exhaust emission
control systemExhaust gas recirculation system
DEGR valve
DEGR solenoid valve No.1
DEGR solenoid valve No.2
DEGR valve position sensorElectronically-controlled EGR system
Single type
ON-OFF solenoid valve
ON-OFF solenoid valve
Variable resistor type
SERVICE SPECIFICATIONS
ItemsStandard value
EGR solenoid valve Nos. 1 and 2 resistance (at 20_C)Ω36 - 44


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AUTOMATIC TRANSMISSION -Troubleshooting 23-7
No.Inspection pro-
cedure if there is
an abnormality Diag-
nosis
code
No. Check item Judgment value Test/operation Pre-test/opera-
tion conditions
6Selector lever
position:
Sports mode
(Must be done on
a level and
straight road.)Selector lever posi-
tion and engine
(1) Idling in 1st
(Vehicle
stopped)
(2) Driving at aData List No. 63
(2) 1st
(3) 2nd
(4) 3rd
(5) 4th
(6) 5thShift condi-
tion--
constant speed
of 10 km/h in 1st
(3) Driving at a
constant speed
of 30 km/h in 2nd
(4) Driving at a
constant speedData List No. 31
(2) 0%
(3) 100%
(4) 100%
(5) 100%
(6) 100%Low & re-
verse sole-
noid valve
(LR solenoid
valve)31LR solenoid
valve system
constant speed
of 50 km/h in 3rd
(5) Driving at a
constant speed
of 50 km/h in 4th
(6) Driving at a
constant speed
Data List No. 32
(2) 0%
(3) 0%
(4) 0%
(5) 0%
(6) 100%Underdrive
solenoid
valve (UD
solenoid
valve)32UD solenoid
valve system
of 70 km/h in 5th
(Each condition
should be main-
tained for 10 seconds
or more)
Data List No. 33
(2) 100%
(3) 0%
(4) 100%
(5) 100%
(6) 0%Second sole-
noid valve
(2ND sole-
noid valve)332nd solenoid
valve system
Data List No. 34
(2) 100% (5) 0%
(3) 100% (6) 0%
(4) 0%Overdrive
solenoid
valve (OD
solenoid
valve)34OD solenoid
valve system
Data List No. 35
(2) 0% (5) 100%
(3) 0% (6) 100%
(4) 0%Reduction
solenoid
valve (RED
solenoid
valve)35RED solenoid
valve system
Data List No. 29
(1) 0 km/h
(5) 50 km/hVehicle
speed sen-
sor-Vehicle speed
sensor system
Data List No. 22
(5) 1,300 - 1,600
r/minInput shaft
speed sen-
sor22Input shaft
speed sensor
system
Data List No. 23
(5) 1,300 - 1,600
r/minOutput shaft
speed sen-
sor23Output shaft
sensor system
Selector lever posi-
tion and engine
(1) Driving at 30
km/h in 2 range,Data List No. 36
(1) 70% - 90% to
0%
(2) 70% - 90%Damper
clutch con-
trol solenoid
valve (DCC36
52DCC solenoid
valve system
then fully close
the accelerator.
(2) Driving at a
constant speed
of 50 km/h in 4thData List No. 52
(1) - 300 - - 100
r/min or 100 -
300 r/min
(2) - 10 - 10 r/minsolenoid
valve)


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AUTOMATIC TRANSMISSION -Troubleshooting 23-20
Code No. 22 Input shaft speed sensor systemProbable cause
If no output pulse from the input shaft speed sensor is detected for 1 second or
more while the vehicle is driving at 30 km/h or more in 4th, it isjudged that
there is a short-circuit oropencircuit in the input shaft speed sensor, and code
No. 22 is output.
If code No. 22 is output 4 times, the transmission is locked at 3rd gear (D) or
2nd gear (downshift operation in Sports mode) as a fail-safe measure, and the N
range indicator lampflashes at 1 Hz.DMalfunction of input shaft speed sensor
DMalfunction of reverse clutch retainer
DMalfunction of harness or connector
DMalfunction of engine-A/T-ECU <6G7>
DMalfunction of A/T-ECU<4M4>
LRefer to the Transmission Workshop Manual.
Transient malfunction
(Refer to GROUP 00 - Points to
Note for Transient Malfunctions.)
OK NG
Check the following connectors:
<6G7> D-121,<4M4>D-108
To the nextpage
NG
OKNG
NG
RepairCheck the following connectors:
<6G7> D-122,<4M4>D-108
Replace the engine-A/T-ECU or
A/T-ECU.
OKMUT-
IIData List
DNo. 22 Input shaft speed sensor
OK:Refer to P.23-61 (Data List
Chart).
Repair
OK
NG
NG
Check the trouble symptoms.
OK
Measure at engine-A/T-ECU
connector D-121 <6G7>, or at
A/T-ECU connector D-107 <4M4>.
DMeasure at the ECU terminals
DIgnition switch: ON
D<6G7> Voltage between terminal
81 and earth
D<4M4> Voltage between terminal
43 and earth
OK:0.5 V or less
Replace the engine-A/T-ECU or
A/T-ECU. NGCheck the trouble symptoms.
NG
Check the trouble symptoms.
Check the following connectors:
<6G7> D-121, D-122,<4M4>D-108
Replace the engine-A/T-ECU or
A/T-ECU.
OK
OK
Measure at engine-A/T-ECU
connector D-122 <6G7>, or at
A/T-ECU connector D-108 <4M4>.
DMeasure at the ECU terminals
DDisconnect C-23
DIgnition switch: ON
D<6G7> Voltage between terminal
103 and earth
D<4M4> Voltage between terminal
31 and earth
OK:4.8 - 5.2 V
Measure the output wave pattern of
the input shaft speed sensor at
engine-A/T-ECU connectors D-121
and D-122 <6G7>, or at A/T-ECU
connector D-108<4M4>(using an
oscilloscope).
DVehicle speed: approx. 50 km/h
DShift range: 4th
D<6G7> Voltage between terminal
81 of D-121 and terminal 103 of
D-122
D<4M4> Voltage between terminal
31 of D-108 and terminal 43 of
D-108
OK:A wave pattern such as the
one shown on P.23-69
(Check Procedure Using an
Oscilloscope) should be
output, and the maximum
value should be 4.8 V or
more and the minimumval-
ue should be 0.8 V or less.
There should be no noise
in the output wave pattern.NG
NG
Repair


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