Mitsubishi Pajero Pinin. Manual — part 34
13A-2
GASOLINE DIRECT
INJECTION (GDI)
CONTENTS
GENERAL INFORMATION
3
. . . . . . . . . . . . . . . . . .
SERVICE SPECIFICATIONS
7
. . . . . . . . . . . . . . . . .
SEALANT
7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS
8
. . . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING
10
. . . . . . . . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE
92
. . . . . . . . . . . . . . . . . . . .
Throttle Body (Throttle Valve Area) Cleaning
92
. .
Throttle Position Sensor Adjustment
92
. . . . . . . . . .
Accelerator Pedal Position Sensor
Adjustment
94
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Pressure Test
95
. . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Leak Check
99
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Pump Connector Disconnection (How to
Reduce Fuel Pressure)
99
. . . . . . . . . . . . . . . . . . . . . .
Fuel Pump Operation Check
100
. . . . . . . . . . . . . . . .
Component Location
101
. . . . . . . . . . . . . . . . . . . . . . .
Engine Control Relay, Fuel Pump Relay, Injector
Driver Relay and Throttle Valve Control Servo
Relay Continuity Check
102
. . . . . . . . . . . . . . . . . . . . .
Intake Air Temperature Sensor Check
102
. . . . . . .
Engine Coolant Temperature Sensor Check
102
. .
Throttle Position Sensor Check
103
. . . . . . . . . . . . .
Accelerator Pedal Position Sensor (1st channel)
Check
104
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accelerator Pedal Position Sensor (2nd channel)
Check
104
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Accelerator Pedal Position Switch Check
105
. . . .
Oxygen Sensor Check
105
. . . . . . . . . . . . . . . . . . . . .
Injector Check
106
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Throttle Valve Control Servo Check
107
. . . . . . . . .
Purge Control Solenoid Valve Check
107
. . . . . . . .
EGR Valve Check
107
. . . . . . . . . . . . . . . . . . . . . . . . .
FUEL PUMP (HIGH PRESSURE) AND FUEL
PRESSURE REGULATOR (HIGH
PRESSURE)
108
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INJECTOR 111
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THROTTLE BODY
114
. . . . . . . . . . . . . . . . . . . . . . . .
INJECTOR DRIVER
116
. . . . . . . . . . . . . . . . . . . . . .
THROTTLE VALVE CONTROLLER
117
. . . . . . . .
GDI –
General Information
13A-3
GENERAL INFORMATION
The Gasoline Direct Injection System consists
of sensors which detect the engine conditions,
the engine-ECU which controls the system
based on signals from these sensors, and
actuators which operate under the control of
the engine-ECU. The engine-ECU carries out
activities such as fuel injection control, idle
speed control and ignition timing control. In
addition, the engine-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 1-3-4-2. 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 deter-
mines how deeply the accelerator pedal is
depressed by means of the accelerator position
sensor (APS). Then the engine-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 operates the throttle valve
control servo so that engine speed is maintained
within a map value. The map value is
predetermined according to engine coolant
temperature and air-conditioning load. In
addition, if the A/C switch is turned on or off
during engine idling, the engine-ECU
compensates the engine speed by operating
the throttle valve control servo as necessary.
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 from the
engine speed, intake air volume, engine coolant
temperature, atmospheric pressure and
injection timing (intake stroke or compression
stroke).
GDI –
General Information
13A-4
SELF-DIAGNOSIS FUNCTION
D
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.
D
When an abnormality is detected in one
of the sensors or actuators, a diagnosis
code corresponding to the abnormality is
output.
D
The RAM data inside the engine-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.
Fan Motor Control
The revolutions of the radiator fan and
condenser fan are controlled in response
to the engine coolant temperature and
vehicle speed.
4.
Purge Control Solenoid Valve Control
Refer to GROUP 17.
5.
EGR Control Servo Control
Refer to GROUP 17.
GENERAL SPECIFICATIONS
Items
Specifications
Throttle body
Throttle bore mm
60
Throttle position sensor
Variable resistor type
Throttle valve control servo
Torque motor type
Engine-ECU
Identification model No.
E2T71575
Sensors
Air flow sensor
Karman vortex 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
Variable resistor type
Accelerator pedal position switch
Rotary contact type, within accelerator pedal position
sensor
Vehicle speed sensor
Magnetic resistive element type
Inhibitor switch
Contact switch type
Camshaft position sensor
Magnetic resistive element type
Crank angle sensor
Hall element type
Detonation sensor
Piezoelectric type
Fuel pressure sensor
Metallic membrane type
Power steering fluid pressure switch
Contact switch type
GDI –
General Information
13A-5
Items
Specifications
Actuators
Engine control relay type
Contact switch type
Fuel pump relay type
Contact switch type
Injector driver control relay
Contact switch type
Injector type and number
Electromagnetic type, 4
Injector identification mark
DIM 100G
Throttle valve control servo relay
Contact switch type
Throttle valve control servo
Torque motor type
EGR control servo
Stepper motor type
Purge control solenoid valve
Duty cycle type solenoid valve
Fuel pressure
regulator (low
pressure)
Regulator pressure kPa
324
Fuel pressure
regulator
(high pres-
sure)
Regulator pressure MPa
5
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