Mitsubishi Lancer Evolution 7. Manual — part 176
MPI -
General Information
13A-3
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 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 idle speed control 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 barometric 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 -
General Information
13A-4
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
60
Throttle position sensor
Variable resistor type
Idle speed control servo
Stepper motor type
(Stepper motor type by-pass air control system with the
air volume limiter)
Engine-ECU
Identification No.
E6T34874
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
Camshaft position sensor
Hall element type
Crank angle sensor
Hall element type
Detonation sensor
Piezoelectric type
Power steering fluid pressure switch
Contact switch type
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
MDL560
EGR control solenoid valve
Duty cycle type solenoid valve
Purge control solenoid valve
Duty cycle type solenoid valve
Fuel pressure control solenoid valve
ON/OFF type solenoid valve
Waste gate solenoid valve
Duty cycle type solenoid valve
Secondary air control solenoid valve
ON/OFF type solenoid valve
Fuel pressure
regulator
Regulator pressure kPa
294
MPI -
General Information
13A-5
MULTI-POINT FUEL INJECTION SYSTEM DIAGRAM
L
1 Oxygen sensor (front)
L
2 Oxygen sensor (rear)
L
3 Air flow sensor
L
4 Intake air temperature sensor
L
5 Throttle position sensor
L
6 Camshaft position sensor
L
7 Crank angle sensor
L
8 Barometric pressure sensor
L
9 Engine coolant temperature sensor
L
10 Detonation sensor
Engine-ECU
l
1 Injector
l
2 Idle speed control servo
l
3 Fuel pressure control solenoid valve
l
4 Waste gate solenoid valve
l
5 EGR control solenoid valve
l
6 Purge control solenoid valve
l
7 Secondary air control solenoid valve
D
Power supply
D
Ignition switch IG
D
Ignition switch ST
D
Vehicle speed sensor
D
A/C switch
D
A/C load signal
D
Tachometer
D
Power steering fluid pressure switch
D
Alternator FR terminal
D
Diagnosis control terminal
D
Intercooler water spray switch (automatic)
D
Intercooler water spray switch (manual)
D
Engine control relay
D
Fuel pump relay 2, 3
D
A/C relay
D
Ignition coil
D
Fan controller
D
Condenser fan relay (HI)
D
Condenser fan relay (LOW)
D
Engine warning lamp
D
Diagnosis output
D
Alternator G terminal
D
Intercooler water spray relay
D
Intercooler water spray lamp
L
1 Oxygen
sensor
(front)
L
4 Intake air
temperature
sensor
L
5 Throttle
position
sensor
L
6 Camshaft
position sensor
l
1 Injector
l
2 Idle
speed
control
servo
l
6 Purge
control
solenoid
valve
Three-way
catalytic converter
Canister
Air
inlet
Vacuum
tank
Fuel
pressure
regurator
From
fuel tank
To fuel tank
PCV valve
From
fuel pump
Waste gate
actuator
L
2 Oxygen sensor (rear)
Check
valve
By-pass
valve
l
5 EGR control
solenoid valve
l
4 Waste gate
solenoid valve
L
8 Barometric
pressure
sensor
L
3 Air flow
sensor
l
7 Secondary
air control
solenoid
valve
Secondary
air valve
l
3 Fuel pressure
control
solenoid valve
EGR
valve
L
9 Engine coolant
temperature sensor
L
7 Crank angle sensor
L
10 Detonation sensor
MPI -
Service Specifications/Sealant
13A-6
SERVICE SPECIFICATIONS
Items
Specifications
Basic idle speed r/min
850 ± 100
Throttle position sensor adjusting voltage mV
535 - 735
Throttle position sensor resistance kΩ
3.5 - 6.5
Idle speed control servo coil resistance (at 20_C) Ω
28 - 33
Intake air temperature sensor
resistance kΩ
-20_C
13 - 17
resistance kΩ
0_C
5.7 - 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 kΩ
-20_C
14 - 17
sensor resistance kΩ
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 heater
resistance (at 20_C) Ω
Front
4.5 - 8.0
resistance (at 20_C) Ω
Rear
11 - 18
Oxygen sensor output voltage (at racing) V
0.6 - 1.0
Fuel pressure kPa
Vacuum hose disconnection
289 - 309 at curb idle
Vacuum hose connection
Approximately 230 at curb idle
Fuel pressure control solenoid valve resistance (at 20_C) Ω
28 - 36
Fuel pump resistor resistance Ω
0.45 - 0.65
Injector coil resistance (at 20_C) Ω
2 - 3
Injector fuel leakage rate Drop/minute
1 or less
Resistor (for injector) resistance (at 20_C) Ω
5.8 - 6.2
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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