Mitsubishi Grandis. Manual — part 688
13A-3
Inspection Procedure 18: Odor, White Smoke, Black
Smoke, and High-Concentration CO/HC during Idling
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection Procedure 19: Battery Run Down
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection Procedure 20: Overheating . . . .
Inspection Procedure 21: Abnormal Rotation of Fan
Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection Procedure 22: Engine-ECU <M/T> or
Engine-A/T-ECU <A/T> Power Supply, Engine Control
Relay, Ignition Switch-IG1 System . . . . . . .
Inspection Procedure 23: Fuel Pump System
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection Procedure 24: Fan Control Relay System
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection Procedure 25: A/C Compressor Relay
System . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection Procedure 26: Ignition Circuit System
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data List Reference Table . . . . . . . . . . . . .
Actuator Test Reference Table . . . . . . . . . .
CHECK AT THE ECU TERMINALS . . . . . .
INSPECTION PROCEDURE USING OSCILLOSCOPE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE. . . . . . . . . . .
THROTTLE BODY (THROTTLE VALVE AREA)
CLEANING . . . . . . . . . . . . . . . . . . . . . . . . .
FUEL PRESSURE TEST . . . . . . . . . . . . . .
FUEL PUMP RELAY DISCONNECTION (HOW TO
REDUCE PRESSURIZED FUEL LINES) . .
FUEL PUMP OPERATION CHECK . . . . . .
COMPONENT LOCATION . . . . . . . . . . . . .
ENGINE CONTROL RELAY CONTINUITY CHECK
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FUEL PUMP RELAY CONTINUITY CHECK
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THROTTLE VALVE CONTROL SERVO RELAY
CONTINUITY CHECK . . . . . . . . . . . . . . . . .
INTAKE AIR TEMPERATURE SENSOR CHECK
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ENGINE COOLANT TEMPERATURE SENSOR
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OXYGEN SENSOR CHECK . . . . . . . . . . . .
INJECTOR CHECK . . . . . . . . . . . . . . . . . . .
THROTTLE VALVE CONTROL SERVO CHECK
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OIL CONTROL VALVE CHECK . . . . . . . . .
INJECTOR . . . . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
THROTTLE BODY ASSEMBLY . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
ENGINE-ECU AND ENGINE-A/T-ECU
REMOVAL AND INSTALLATION . . . . . . . .
GENERAL INFORMATION
MULTIPORT FUEL INJECTION (MPI)
13A-4
GENERAL INFORMATION
M1131000101618
The Multipoint Fuel Injection System consists of
sensors which detect the engine conditions, the
engine-ECU <M/T> or engine-A/T-ECU <A/T> which
controls the system based on signals from these
sensors, and actuators which operate under the
control of the engine-ECU <M/T> or engine-A/T-ECU
<A/T>. The engine-ECU <M/T> or engine-A/T-ECU
<A/T> carries out activities such as fuel injection
control, idle speed control and ignition timing control.
In addition, the engine-ECU <M/T> or
engine-A/T-ECU <A/T> is equipped with several
diagnosis modes which simplify troubleshooting
when a problem develops.
FUEL INJECTION CONTROL
The injector drive times and injection timing are
controlled so that the optimum air/fuel mixture is
supplied to the engine to correspond to the
continually-changing engine operation conditions.
A single injector is mounted at the intake port of each
cylinder. Fuel is sent under pressure from the fuel
tank by the fuel pump, with the pressure being
regulated by the fuel pressure regulator. The fuel
thus regulated is distributed to each of the injectors.
Fuel injection is normally carried out once for each
cylinder for every two rotations of the crankshaft. The
firing order is 1-3-4-2. This is called sequential fuel
injection. The engine-ECU <M/T> or
engine-A/T-ECU <A/T> provides a richer air/fuel
mixture by carrying out "open-loop" control when the
engine is cold or operating under high load
conditions in order to maintain engine performance.
In addition, when the engine is warm or operating
under normal conditions, the engine-ECU <M/T> or
engine-A/T-ECU <A/T> controls the air/fuel mixture
by using the oxygen sensor signal to carry out
"closed-loop" control in order to obtain the theoretical
air/fuel mixture ratio that provides the maximum
cleaning performance from the three way catalyst.
THROTTLE VALVE OPENING CONTROL
This system electrically controls the opening of the
throttle valve. The engine-ECU <M/T> or
engine-A/T-ECU <A/T> detects the amount of travel
of the accelerator pedal via the accelerator pedal
position sensor, and controls the actuation of the
throttle valve control servo, which is mounted on the
throttle body, in order to attain the target throttle
valve opening that has been predetermined in
accordance with driving conditions.
IDLE AIR CONTROL
The idle speed is kept at the optimum speed by
controlling the amount of air that passes through the
throttle valve in accordance with changes in idling
conditions and engine load during idling.
The engine-ECU <M/T> or engine-A/T-ECU <A/T>
drives the throttle valve control servo to keep the
engine running at the pre-set idle target speed in
accordance with the engine coolant temperature and
A/C and other electrical load. In addition, when the
air conditioning switch is turned off and on while the
engine is idling, the throttle valve control servo
adjusts the throttle valve passes through air amount
according to the engine load conditions to avoid
fluctuations in the engine speed.
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 timing is determined by the
engine-ECU <M/T> or engine-A/T-ECU <A/T> from
the engine speed, intake air volume, engine coolant
temperature and atmospheric pressure.
GENERAL INFORMATION
MULTIPORT FUEL INJECTION (MPI)
13A-5
SELF-DIAGNOSIS FUNCTION
• When an abnormality is detected in one of the
sensors or actuators related to emission control,
the engine warning lamp (check engine lamp)
illuminates as a warning to the driver.
• When an abnormality is detected in one of the
sensors or actuators, a diagnosis code
corresponding to the abnormality is output.
• The RAM data inside the engine-ECU <M/T> or
engine-A/T-ECU <A/T> that is related to the
sensors and actuators can be read by means of
the MUT-III. 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. Oil Control Valve Control
The engine-ECU <M/T> or engine-A/T-ECU <A/T>
effects duty cycle control on the engine oil control
valve, in accordance with the engine speed. This
regulates the supply of engine oil to the intake
rocker shaft, which switches the cams.
4. Fan Motor Control
The revolutions of the radiator fan and condenser fan
are controlled in response to the engine coolant
temperature and vehicle speed.
5. Alternator Output Current Control
Prevents alternator output current from increasing
suddenly and idle speed from dropping at times
such as when the headlamp are turned on.
6. Purge Control Solenoid Valve Control
(Refer to
− Engine And
Emission Control
− Evaporative Emission Control
System).
7. EGR Control Solenoid Valve Control
[Refer to
− Engine And
Emission Control
− Exhaust Gas Recirculation
(EGR) System].
GENERAL SPECIFICATIONS
Items
Specifications
Throttle body
Throttle bore mm
60
Throttle position sensor
Hall element type
Throttle valve control servo
DC motor type, having broshes
engine-ECU
<M/T>
Identification No.
E6T41876
Engine-A/T-E
CU <A/T>
Identification No.
E6T41875
Sensors
Air flow sensor
Heat sensitizing type
Barometric pressure Sensor
Semiconductor type
Intake air temperature sensor
Thermistor type
Engine coolant temperature sensor
Thermistor type
Oxygen sensor
Zirconia type
Accelerator pedal position sensor
Hall element type
Vehicle speed sensor <M/T>
Magnetic resistive element type
Inhibitor switch <A/T>
Contact switch type
Camshaft position sensor
Magneto resistance element type
Crank angle sensor
Magneto resistance element type
Detonation sensor
Piezoelectric type
Power steering fluid pressure sensor
Semiconductor type
GENERAL INFORMATION
MULTIPORT FUEL INJECTION (MPI)
13A-6
Actuators
Engine control relay type
Contact switch type
Fuel pump relay type
Contact switch type
Injector type and number
Electromagnetic type, 4
Injector identification mark
HDA305E
Throttle actuator control motor relay
Contact switch type
Oil control valve
Duty cycle type solenoid valve
EGR valve
Stepper motor
Purge control solenoid valve
Duty cycle type solenoid valve
Fuel pressure
regulator
Regulator pressure kPa
328
Items
Specifications
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