2000 MITSUBISHI MONTERO ECU

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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GDI-General/General Information13A-3
GENERAL
OUTLINE OF CHANGE
The engine
-ECU and engine-A/T-ECU , which feature communication port with stability control
system, have been introduced. The service procedures for these ECUs are the same as before.
GENERAL INFORMATION
GENERAL SPECIFICATIONS
ItemsSpecifications
Engine-ECU Identification No.E2T79275
E2T79276
Engine-A/T-ECU Identification No.E2T76290
E2T76291


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GDI -General/General Information/Troubleshooting13A-3
GENERAL
OUTLINE OF CHANGES
Due to the changes as shown below, the service procedures regarding the different description from
the previous version have been established.
DOn M/T, the engine-ECU has been changed as diagnosis code P1603 has been added.
DOn A/T, the engine-A/T-ECU has been changed as an on-board diagnosis system has been adopted.
The engine warning lamp control, the diagnosis function, the service data output and the actuator
test are basically the same as for M/T.
DOn A/T, an dual oxygen sensor has been adopted. This sensor is the same as for the previous
M/T.
GENERAL INFORMATION
GENERAL SPECIFICATIONS
ItemsSpecifications
Engine-ECU Identification No.E2T79277
E2T79278
Engine-A/T-ECU Identification No.E2T76292
E2T76293
TROUBLESHOOTING
DIAGNOSIS FUNCTION
ENGINE WARNING LAMP (CHECK ENGINE LAMP)
The following item has been added as diagnosis code P1603 has been added. The other items are
the same as before.
Engine warning lamp inspection items
Code No.Diagnosis item
P1603Battery backup line malfunction
INSPECTION CHART FOR DIAGNOSIS CODES
Diagnosis code P1603 has been added. The other codes are the same as for the previous M/T.
Code No.Diagnosis itemReference page
P1603Battery backup line malfunction13A-4


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GDI -TroubleshootingGDI -Troubleshooting13A-4
INSPECTION PROCEDURE CLASSIFIED BY DIAGNOSIS CODE
Code No. P1603 Battery backup line malfunctionProbable cause
Range of Check
DStarting sequence was completed.
DThe battery voltage is 10 V or more.
Set Condition
DBattery backup line voltage is less than 2 V.DOpen or short circuit in the battery back-up line or
loose connector contact
DMalfunction of engine-ECU
DMalfunction of engine-A/T-ECU
NOTE: If the engine is started while the ignition-off
current draw connector has been pulled off, the
engine - ECU or the engine-A/T-ECU
judges that the battery backup line is open, and
illuminates the engine warning lamp and stores this
diagnosis code.
NG
Replace the engine-ECU or engine-A/T-ECU .
Check the trouble symptoms.
OKNG
Repair
Check the harness wire between the battery and the engine-ECU
or engine-A/T-ECU, and repair if necessary.
OKNG
Repair
Check the harness wire between the battery and the engine-ECU
or engine-A/T-ECU , and repair if necessary.
OK
NG
Repair
MUT-IISelf-Diag Code
Is code No. P1603 set?
Check the following connector:D-117 , D-120 OKNO
Check the following connectors:E-13, D-27, D-31 drive vehicles>, D-223 YESMeasure at engine-ECU connector D-117 or engine-A/T-ECU
connector D-120 .
DDisconnect the connector, and measure at the harness
side.
DThe voltage between terminal No.60 or 66
and earth
OK:System voltageNG
Intermittent malfunction (Refer to GROUP 00 - Points to Notes
for Intermittent Malfunction).


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GDI -Troubleshooting13A-5
DATA LIST REFERENCE TABLE
The data list has been changed as the engine-ECU and the engine-A/T-ECU have been changed. The
other items are the same as for M/T.
Item
No.Inspection
itemInspection contentsNormal conditionInspec-
tion pro-
cedure
No.Refer-
ence
page
22Crank angle
sensorDEngine: Cranking
DTachometer:
ConnectedCompare the engine
speed readings on
the tachometer and
the MUT-II.AccordCode
No.
P033513A-56*
DEngine: Idling
DIdle position
switch: ONWhen engine
coolant temperature
is - 20_C1,300 - 1,500
r/min
When engine
coolant temperature
is 0_C1,300 - 1,500
r/min
When engine
coolant temperature
is 20_C1,250 - 1,450
r/min
When engine
coolant temperature
is 40_C1,100 - 1,300
r/min
When engine
coolant temperature
is 80_C (more than
four minutes later
after engine has
started)600 - 800 r/min
A1LOxygen
sensorEngine: After having
warmed up. (Air/fuel
mixture is made
leaner when deceler-When at 4,000
r/min, engine is
decelerated200 mV or lessCode
No.
P013013A-28*
leanerwhendeceler
ating, and is made
richer when racing.)Rev the engine.600 - 1000 mV
Engine: After having
warmed up (The
oxygen sensor signal
is used to check the
air/fuel mixture ratio,
and control condition
isalsocheckbythe
Engine is idling
(more than 4
minutes later after
engine has started)Voltage should
alternate between
400 mV or less
and 600 - 1,200
mV (more than 4
minutes after the
enginehasisalso checkbythe
engine-ECU
or engine-A/T-ECU
.)
2,500 r/min
enginehas
started).
24LVehicle
speed sen-
sorDrive at 40 km/hApproximately 40
km/hCode
No.
P050013A-63*


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GDI -Troubleshooting/On-vehicle Service13A-7
CHECK AT THE ENGINE-ECU TERMINALS
TERMINAL VOLTAGE CHECK CHART
Engine-A/T-ECU Connector Terminal Arrangement
The terminals below have been changed as the engine-A/T-ECU has been changed. The other terminals
are the same as before.
Terminal No.Check itemCheck requirements (Engine condition)Normal condition
3Oxygen sensor heat-
er(front)
Engine: Idling0-3V
er(front)
Engine: 3,500 r/minSystem voltage
26Oxygen sensor heat-
er(rear)
Engine: Idling0-3V
er(rear)
Engine: 3,500 r/minSystem voltage
71Oxygen sensor (front)Engine: Warmed up, and then hold the engine
speed at 2,500 r/min (Use a digital voltmeter)0 and 0.8 V alternate.
73Oxygen sensor (rear)DTransmission: 2nd gear
DEngine speed: 3,500 r/min or more
DDriving with the throttle valve widely open0.6 - 1.0 V
Engine-A/T-ECU Harness-side Connector Terminal Arrangement
The terminals below have been changed as the engine-A/T-ECU has been changed. The other terminals
are the same as before.
Terminal No.Check itemStandard value, normal condition (check conditions)
3-41Oxygen sensor heater (front)11 - 1 8Ω(at 20_C)
26 - 41Oxygen sensor heater (rear)11 - 1 8Ω(at 20_C)
ON-VEHICLE SERVICE
OXYGEN SENSOR CHECK
On A/T, a dual oxygen sensor has been adopted. Its service
procedure is the same as for the previous M/T.


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13C-1
DIESEL FUEL
<4M4>
CONTENTS
GENERAL INFORMATION 2...................
SERVICE SPECIFICATIONS 3.................
SEALANT 3..................................
SPECIAL TOOLS 4...........................
TROUBLESHOOTING 5.......................
ON-VEHICLE SERVICE 42...................
Injection Timing Check and Adjustment 42.........
Idle Speed Check and Adjustment 42.............
Accelerator Pedal Position Sensor (APS)
Adjustment 42.................................
Control Relay Continuity Check 43................
Accelerator Pedal Position Sensor (APS) Check 43.Idle Switch Check 43...........................
Boost Air Temperature Sensor (Intake Air
Temperature Sensor) Check 44..................
Engine Coolant Temperature Sensor Check 44.....
Evacuation of Water from Fuel Filter 45...........
Fuel Filter Cartridge Replacement 45.............
Evacuation of Air from Fuel Line 45...............
Fuel Injection Pump Check 46...................
Intake Air Restriction Equipment Check 48.........
Injection Nozzle Check and Adjustment 49.........
INJECTION NOZZLE 50......................
INJECTION PUMP 56........................
ENGINE-ECU 59............................


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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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