Mitsubishi Pajero Pinin. Manual - part 34

 

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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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