Mitsubishi Pajero Pinin. Manual — part 104
MPI <4G9> –
General Information
13C-2
GENERAL
OUTLINE OF CHANGES
The following contents have been established to correspond to the addition of vehicles with 4G9-MPI
engine.
GENERAL INFORMATION
The Multipoint Fuel 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 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
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 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.
IDLE AIR CONTROL
The idle speed is kept at the optimum speed
by controlling the amount of air that bypasses
the throttle valve in accordance with changes
in idling conditions and engine load during idling.
The engine-ECU drives the idle speed control
(ISC) motor to keep the engine running at the
pre-set idle target speed in accordance with
the engine coolant temperature and air
conditioner load. In addition, when the air
conditioner switch is turned off and on while
the engine is idling, the ISC motor operates
to adjust the throttle valve bypass air amount
in accordance with the engine load conditions
in order 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 from the
engine speed, intake air volume, engine coolant
temperature and atmospheric pressure.
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.
MPI <4G9> –
General Information
13C-3
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 Solenoid Valve Control
Refer to GROUP 17.
GENERAL SPECIFICATIONS
Items
Specifications
Throttle body
Throttle bore mm
50
Throttle position sensor
Variable resistor type
Idle speed control servo
Stepper motor type
(Stepper motor type by-pass air control system)
Engine-ECU
Identification model No.
E2T74481
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
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
Power steering fluid pressure switch
Contact switch type
Actuators
Control relay type
Contact switch type
Fuel pump relay
Contact switch type
Injector type and number
Electromagnetic type, 4
Injector identification mark
CDH 210
EGR control solenoid valve
Duty cycle type solenoid valve
Purge control solenoid valve
Duty cycle type solenoid valve
Fuel pressure
regulator
Regulator pressure kPa
329
MPI <4G9> –
General Information
13C-4
CONTROL SYSTEM DIAGRAM
L
1 Oxygen sensor
<front>
L
2 Air flow sensor
L
3 Intake air temperature
sensor
L
4 Throttle position
sensor
L
5 Camshaft position
sensor
L
6 Crank angle sensor
L
7 Engine coolant
temperature sensor
L
8 Barometric pressure
sensor
L
9 Detonation sensor
L
10Oxygen sensor
<rear>
D
Power supply
D
Ignition switch-IG
D
Ignition switch-ST
D
Vehicle speed sensor
D
A/C switch
D
A/C thermo sensor
D
Inhibitor switch
D
Power steering fluid
pressure switch
D
Alternator FR termi-
nal
D
A/T-ECU
Engine-
ECU
l
1 Injector
l
2 Idle speed control
servo
l
3 EGR control solenoid
valve
l
4 Purge control
solenoid valve
D
Engine control relay
D
Fuel pump relay
D
A/C relay
D
Ignition coil
D
Fan motor relay
D
Engine warning lamp
D
Tachometer
D
Diagnosis output
D
Alternator G terminal
D
A/T-ECU
From
fuel
pump
L
5 Camshaft position
sensor
L
4 Throttle position
sensor
L
3 Intake air temperature
sensor
L
2 Air flow sensor
L
8 Barometric pressure
sensor
l
4 Purge control solenoid valve
L
7 Engine coolant
temperature sensor
L
9 Detonation sensor
L
1 Oxygen sensor
<front>
L
6 Crank angle sensor
Canister
l
3 EGR controlsolenoid valve
To fuel
tank
l
2 Idle speed
control servo
Air cleaner
Air
EGR valve
Catalytic converter
Fuel pressure
regulator
PCV valve
l
1 Injector
L
10Oxygen sensor
<rear>
E
M
A
MPI <4G9> –
Service Specifications/Sealant
13C-5
SERVICE SPECIFICATIONS
Items
Specifications
Basic idle speed r/min
700
±
50
Throttle position sensor adjusting voltage mV
535 – 735
Throttle position sensor resistance k
Ω
3.5 – 6.5
Idle speed control servo coil resistance
Ω
27 – 33 (at 20
_
C)
Intake air temperature sensor
resistance k
Ω
–20
_
C
13 – 17
resistance k
Ω
0
_
C
5.3 – 6.7
20
_
C
2.3 – 3.0
40
_
C
1.0 – 1.5
60
_
C
0.56 –0.76
80
_
C
0.30 – 0.42
Engine coolant temperature
sensor resistance k
Ω
–20
_
C
14 – 17
sensor resistance k
Ω
0
_
C
5.1 – 6.5
20
_
C
2.1 – 2.7
40
_
C
0.9 – 1.3
60
_
C
0.48 – 0.68
80
_
C
0.26 – 0.36
Oxygen sensor output voltage (at racing) V
0.6 – 1.0
Fuel pressure kPa
Vacuum hose disconnection
324 – 343 at curb idle
Vacuum hose connection
Approx. 265 at curb idle
Injector coil resistance
Ω
13 – 16 (at 20
_
C)
SEALANT
Item
Specified sealant
Remark
Engine coolant temperature sensor
threaded portion
3M Nut Locking Part No. 4171 or equivalent
Drying sealant
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