2000 MITSUBISHI MONTERO MOTOR

GDI -Troubleshooting 13A-196
Inspection procedure 34
Injector driver
Probable cause
The engine-A/T-ECU drives the injector by the drive signal.DMalfunction of the injector driver
DImproper connector contact,opencircuit or
short-circuited harness wire
DMalfunction of the engine-A/T-ECU
OK
NG
Replace the engine-A/T-ECU.
OK
Check the trouble symptoms.Transient malfunction
(Refer to GROUP 00 - Points to Note for Intermittent
Malfunctions.) OK
Use a analyzer to measure the signal waveform at the engine-
A/T-ECU connectors D-119 and D-120.
DEngine: idling
DSelector lever position: P
DVoltage between 96 and earth, and between 1 and earth
OK:
A normal waveform should be displayed as described
on P.13A-214 (INSPECTIONPROCEDURE USING
AN ANALYZER).NGReplace the injector driver.
NGCheck the following connectors:
B-121, D-119Repair
NG
Repair
OK
Check the harness wire between the injector driver and engine-
A/T-ECU.
Inspection procedure 35
EGR valve (stepper motor) system
Probable cause
The engine-A/T-ECU controls the EGR valve (stepper motor) in order to control
the amount ofexhaust gas mixed in the intake air.DMalfunction of the EGR valve
DOpen circuit or short-circuited harness wire in the
EGR valve circuit
DMalfunction of the engine-A/T-ECU
OK
Check the trouble symptoms.NGCheck the harness wire between the
engine controlrelay and the EGR valve,
and repair if necessary.
OK
Check the trouble symptoms.NGCheck the harness wire between the
engine-A/T-ECU and EGR valve, and
repair if necessary.
OK
Check the trouble symptoms.NGReplace the engine-A/T-ECU.
OK
Check the following connector:
D-120NG
Repair
OK
Measure at the engine-A/T-ECU con-
nector D-120.
DDisconnect the connector, and
measure at the harness side.
DVoltage between 51, 53, 60, 62
and earth (Ignition switch: ON)
OK:
System voltageNGCheck the following connector:
B-60NG
Repair
OK
Measure at the EGR valve connector
B-60.
DDisconnect the connector, and
measure at the harness side.
DVoltage between 2, 5 and earth
(Ignition switch: ON)
OK:
System voltageNGCheck the following connector:
B-25XNG
Repair
Check the EGR valve. (Refer to GROUP
17 - Emission Control System.)NG
Replace


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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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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-3
Diagnosis item Control features in malfunction
Fuel temperature sensorMaintain the fuel temperature at 90_C
Boost pressure sensorDKeep the boost pressure as barometric pressure (101 kPa)
DVoid cruise control
Injection correction ROMDWhen backup data is normal: Correction calculation using backup
data
DWhen backup data is corrupted: Fixed at correction value±0%
GE actuatorDWith accelerator pedal released (when idle switch is on)
Engine speed = 800 r/min
DWith accelerator pedal depressed (when idle switch is off)
Engine speed = 2,000 r/min
DVoid cruise control
Over boostVoid cruise control
Timing control valveDOpen control by means of engine speed
DVoid cruise control
Throttle body assemblyVoid cruise control
EGR sensorEGR control is prohibited
EGR motorEGR control is prohibited
INSPECTION CHART FOR DIAGNOSIS CODES
Code No.Diagnosis itemReference page
11Accelerator pedal position sensor system13C-4
12Boost pressure sensor (boost sensor) system13C-4
13Barometric pressure sensor system13C-4
18Engine speed sensor (backup) system13C-4
21Engine speed sensor system13C-5
23Idle switch (accelerator pedal position sensor built-in) system13C-5
27Accelerator pedal position sensor (sub) system13C-5
41Throttle valve system13C-6
46Injection correction ROM system13C-6
48GE actuator (in the middle of control sleeve position sensor inoperative) system13C-7
51EGR valve system13C-8


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DIESEL FUEL <4M4> -Troubleshooting13C-11
ENGINE-ECU CHECK
TERMINAL VOLTAGE TABLE
Terminal No.Check itemInspection conditions (engine status)Normal condition
14Throttle body assembly (1)Ignition switch: ON (Engine stops)9 V or more
17EGR motorIgnition switch: ON (Engine stops)System voltage
18Throttle body assembly (2)Ignition switch: ON (Engine stops)9 V or more
19Throttle body assembly (3)Ignition switch: ON (Engine stops)9 V or more
20Throttle body assembly (4)Ignition switch: ON (Engine stops)9 V or more
33A/C load signalEngine: Idle
A/C switch: ONDuring weak cooling or
heatingSystem voltage
During normal cooling0-1V
During strong coolingChanges repeatedly
between 0 V and 12 V
37Clutch switch Clutch pedal depressed0-1V
Inhibitor switch Ignition switch:
ON (Engine stops)Move selector lever to N
or P0-1V
Move selector lever to D,
2, L or RSystem voltage
38Control relay (no immobi-
lizer)
Ignition switch: ON0-1V
lizer)
Ignition switch: ON→OFF (after approx. 8
seconds)System voltage
41Select switch Ignition switch:
ON (Engine stops)Move shift lever to 4st or
RSystem voltage
421st - 2nd switch Ignition switch:
ON (Engine stops)Move shift lever to 1st or
2ndSystem voltage
433rd - 4th switch Ignition switch:
ON (Engine stops)Move shift lever to 3rd or
4thSystem voltage
445th - R switch Ignition switch:
ON(Enginestops)
Move shift lever to 5th0-1V
ON(Engine stops)
Move shift lever to RSystem voltage
58TachometerDuring idlingChanges repeatedly
between 0 V and 12 V
90EGR valve sensorDuring racingChanges between 0.5
V and 4.5 V


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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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DIESEL FUEL <4D5-stepIII>-Troubleshooting13E-36
INSPECTION PROCEDURE 19
A/C condenser fan operating problem
Probable cause
The power transistor inside the engine-ECU turns on and off to control the A/C
condenser fan motor relay.DMalfunction of A/C condenser fan motor relay
DMalfunction of A/C condenser fan motor
DMalfunction of thermostat
DOpen circuit or short-circuit in circuit, or poor
connector contact
DMalfunction of engine-ECU
Check the following connector:D-110
OK
Measure at engine-ECU connector D-110.
DDisconnect the connector and measure at the harness
side.
DCheck the A/C condenser fan condition.
(Ignition switch: ON)
OK:Fan stopped
DVoltage between 7 and the earth
(Ignition switch: ON)
OK:System voltage
DShort out 7 and the earth
(Ignition switch: ON)
OK:A/C condenser fan turnsNGA/C condenser fan motor circuit check
(Refer to the wiring harness configuration diagram.)
OK
MUT-IIData list
02 Engine coolant temperature sensor
OK:When engine is idling after having warmed up, the en-
gine coolant temperature and the MUT-IIdisplay temper-
ature are identicalNGEngine coolant temperature sensor check
(Refer to Code 15 on P.13E-59.)
Check the trouble symptoms.OK
Replace the engine-ECU.NG
Repair
Thermostat checkNG
NGReplace
OK


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16-1
ENGINE
ELECTRICAL
CONTENTS
CHARGING SYSTEM 2................
GENERAL INFORMATION 2................
SERVICE SPECIFICATIONS 3..............
SPECIAL TOOL 4.........................
ON-VEHICLE SERVICE 5..................
Alternator Output Line Voltage Drop Test 5....
Output Current Test 6.......................
Regulated Voltage Test 8....................
Waveform Check Using An Analyzer 11.......
ALTERNATOR 13.........................
STARTING SYSTEM 23................
GENERAL INFORMATION 23..............
SERVICE SPECIFICATIONS 24............
STARTER MOTOR 24.....................
IGNITION SYSTEM 37.................
GENERAL INFORMATION 37..............
SERVICE SPECIFICATIONS 38............
SPECIAL TOOL 38.......................
ON-VEHICLE SERVICE 38................
Ignition Coil (With Built-in Power Transistor)
Check 38...................................
Spark Plug Check and Cleaning 39...........
Ignition Failure Sensor Check 40.............
Camshaft Position Sensor Check, Crank angle
Sensor Check, Detonation Sensor Check 40...
IGNITION COIL <6G7> 41.................
CRANKSHAFT ANGLE SENSOR
<6G7> 42................................
CAMSHAFT POSITION SENSOR
<6G7> 42................................
DETONATION SENSOR <6G7> 43.........
GLOW SYSTEM 44....................
GENERAL INFORMATION 44..............
SERVICE SPECIFICATIONS 45............
ON-VEHICLE SERVICE 45................
Self-regulating Glow System Check 45........
Glow & EGR Control Unit Check 48..........
Engine ECU Check 49.......................
Glow Plug Relay Check 50..................
Glow Plug Check 51........................
Engine Coolant Temperature Sensor
Check 51...................................
GLOW PLUG 52..........................


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