fuel pressure MITSUBISHI LANCER EVOLUTION X 2008 User Guide

GENERAL DESCRIPTION
MULTIPORT FUEL SYSTEM (MFI)13A-4
Control System Diagram

AK604117
Fuel level
sensorFuel tank Air
inlet
2 Exhaust engine
oil control valve
1 Intake engine
oil control valve4 Manifold absolute pressure sensor
2 Intake air
temperature sensor
1 Mass airflow sensor
6 Intake
camshaft
position
sensor
7 Exhaust
camshaft
position
sensor
3 Throttle position
sensor (main/sub)
5 Evaporative emission
purge solenoid
3 Throttle actuator
control motor
12 Fuel tank differential
pressure sensor
13 Fuel tank
temperature
sensor10 Heated oxygen sensor (front)
11 Heated oxygen
sensor (rear)
8 Crankshaft position sensor5 Engine coolant
temperature sensor
9 Knock sensor
4 Injector
Fuel pump Fuel pressure
regulator Evaporative
emission
canister
6 Evaporative
emission
ventilation
solenoid
1 Mass airflow sensor
2 Intake air temperature sensor
3 Throttle position sensor (main/sub)
4 Manifold absolute pressure sensor
5 Engine coolant temperature sensor
6 Intake camshaft position sensor
7 Exhaust camshaft position sensor
8 Crankshaft position sensor
9 Knock sensor
10 Heated oxygen sensor (front)
11 Heated oxygen sensor (rear)
12 Fuel tank differential pressure sensor
13 Fuel tank temperature sensor
Ignition switch-IG
Ignition switch-ST
Power supply
CAN communication (input signal)1 Intake engine oil control valve
2 Exhaust engine oil control valve
3 Throttle actuator control motor
4 Injector
5 Evaporative emission purge solenoid
6 Evaporative emission ventilation
solenoid
Ignition coil, ignition power transistor
Multiport fuel injection (MFI) relay
Fuel pump relay
Starter relay
Throttle actuator control motor relay
Generator G terminal
Heated oxygen sensor heater
A/C compressor relay
Diagnostic output
CAN communication (output signal) SenseAct
Engine oil pressure switch
Power steering pressure switch
Generator FR terminal
Generator L terminal
Vehicle speed sensor Accelerator pedal position sensor (main/sub)
Decide
ECM
(with barometric
pressure sensor)
AB

GENERAL DESCRIPTION
MULTIPORT FUEL SYSTEM (MFI)13A-5

AK604118
Fuel tank
Fuel level
sensor Air
inlet
2 Exhaust engine
oil control valve
1 Intake engine
oil control valve4 Manifold absolute pressure sensor
2 Intake air
temperature sensor
1 Mass airflow sensor
6 Intake
camshaft
position
sensor
7 Exhaust
camshaft
position
sensor
3 Throttle position
sensor (main/sub)
5 Evaporative emission
purge solenoid
3 Throttle actuator
control motor
12 Fuel tank differential
pressure sensor
13 Fuel tank
temperature
sensor11 Heated oxygen sensor (rear)
10 Heated
oxygen
sensor
(front)
12 Heated oxygen sensor (3rd)
8 Crankshaft position sensor5 Engine
coolant
temperature
sensor
9 Knock sensor
4 Injector
Fuel pump Fuel pressure
regulator Evaporative
emission
canister
6 Evaporative
emission
ventilation
solenoid
7 EGR valve
(stepper motor)
1 Mass airflow sensor
2 Intake air temperature sensor
3 Throttle position sensor (main/sub)
4 Manifold absolute pressure sensor
5 Engine coolant temperature sensor
6 Intake camshaft position sensor
7 Exhaust camshaft position sensor
8 Crankshaft position sensor
9 Knock sensor
10 Heated oxygen sensor (front)
11 Heated oxygen sensor (rear)
12 Heated oxygen sensor (3rd)
13 Fuel tank differential pressure sensor
14 Fuel tank temperature sensor
Ignition switch-IG
Ignition switch-ST
Power supply
CAN communication (input signal)1 Intake engine oil control valve
2 Exhaust engine oil control valve
3 Throttle actuator control motor
4 Injector
5 Evaporative emission purge solenoid
6 Evaporative emission ventilation
solenoid
7 EGR valve (stepper motor)
Ignition coil, ignition power transistor
Multiport fuel injection (MFI) relay
Fuel pump relay
Starter relay
Throttle actuator control motor relay
Generator G terminal
Heated oxygen sensor heater
A/C compressor relay
Diagnostic output
CAN communication (output signal) SenseAct
Engine oil pressure switch
Power steering pressure switch
Generator FR terminal
Generator L terminal
Vehicle speed sensor Accelerator pedal position sensor (main/sub)
Decide
ECM
(with barometric
pressure sensor)
AB

SENSOR
MULTIPORT FUEL SYSTEM (MFI)13A-9
.
MANIFOLD ABSOLUTE PRESSURE SENSOR
The manifold absolute pressure sensor is installed in the intake
manifold. Manifold absolute pressure sensor uses a piezo
resistive semiconductor to output the voltage according to man
-
ifold absolute pressure to ECM. ECM uses this output voltage
to compensate fuel injection volume according to manifold
absolute pressure. Sensor properties are as shown in the fig
-
ure.
.
AK602207
Intake air
temperature C (F)
AG
Resistance kΩOutput voltage V
Intake air temperature
sensor (thermistor)5V
Intake air
temperature C (F) ECM
AK602254 ACPressure Manifold absolute
pressure sensor
AK602206AH
5V
0
101 5V
GroundOutput voltage V
Pressure kPa (in.Hg) Manifold absolute
pressure sensorPower supply
Output signal
ECM

SENSOR
MULTIPORT FUEL SYSTEM (MFI)13A-18
.
BAROMETRIC PRESSURE SENSOR
A barometric pressure sensor is built into ECM. The barometric
pressure sensor is a semiconductor diffused pressure element
which outputs voltage to ECM according to atmospheric pres
-
sure. ECM uses this output voltage to sense the altitude of the
vehicle and compensates fuel injection volume to achieve the
appropriate air-fuel ratio for that altitude.
.
ENGINE OIL PRESSURE SWITCH
The engine oil pressure switch is installed on the left side of the
cylinder block. The engine oil pressure switch detects whether
the oil pressure is high or low using the contact switch. When
the oil pressure becomes higher than the specified value after
the engine starts, the contact point of the engine oil pressure
switch opens. This allows the ECM to detect the oil pressure is
higher than the specified value. The ECM outputs the OFF sig
-
nal to the combination meter through the CAN and then turns
off the oil pressure warning lamp.
AK602226AD
5V
Knock sensor
Piezoelectric elementECM
AK602575AC
Barometric pressure sensor
(built in ECM)
AK602587AC
Oil
pressure
Contact switch

SENSOR
MULTIPORT FUEL SYSTEM (MFI)13A-19
.
POWER STEERING PRESSURE SWITCH
A power steering pressure switch is installed on the power
steering oil pump. The power steering pressure switch uses a
contact switch to detect the power steering oil pressure. When
power steering oil pressure rises due to operation of the steer
-
ing wheel, the power steering load switch outputs an ON signal
to ECM. ECM performs idle-up according to the voltage and
prevents reduction in engine speed due to power steering load
and so maintains stable idle speed.
.
AK602228
ON
OFF
AD
12
0ONOFF ECM terminal voltage V
Oil pressure:lowOil pressure: high Operating pressure
Oil pressure kPa (in.Hg) Engine oil
pressure switch
ECM
AK601174AF
Power steering
pressure switch
Oil
pressure
AK602213
ON
OFF
AE
Oil pressure:low
Oil pressure: highOperating pressure
Power steering
pressure switch12
0OFF
ON
ECM
ECM
terminal voltage V
Oil pressure kPa (in.Hg)

SENSOR
MULTIPORT FUEL SYSTEM (MFI)13A-20
FUEL TANK DIFFERENTIAL PRESSURE SENSOR
The fuel tank differential pressure sensor is installed to the fuel
pump module. The fuel tank differential pressure sensor out
-
puts the voltage to the ECM using the piezo resistive semicon-
ductor in accordance with the difference between pressure in
the fuel tank and the pressure of the atmosphere. When moni
-
toring the evaporative leak, the ECM detects malfunctions of
the evaporative emission control system by monitoring the
amount of output voltage changes from this sensor. The sensor
characteristics are as shown in the diagram.
.
FUEL TANK TEMPERATURE SENSOR
The fuel tank temperature sensor is installed to the fuel pump
module. The fuel tank temperature sensor detects the tempera
-
ture inside the fuel tank using the resistance change in the ther-
mistor and outputs the voltage to the ECM in accordance with
the temperature inside the fuel tank. The ECM monitors the
evaporative leak in accordance with the fuel tank temperature.
The sensor characteristics are as shown in the diagram.
AK604121Pressure Fuel tank differential
pressure sensorAB
AK604122
5 V
0 GroundOutput voltage V
Pressure kPa (in. Hg) Fuel tank differential pressure sensorECMPower supply
Output signal
AB
AK604123AB
Sensory part
(thermistor) Fuel tank
temperature
sensor
AK604124
ECM
Resistance kΩOutput voltage V
5 V
AB
Fuel tank temperature
sensor (thermistor)
Fuel tank
temperature C (F)Fuel tank
temperature C (F)

ACTUATOR
MULTIPORT FUEL SYSTEM (MFI)13A-25
IGNITION COIL
Refer to GROUP 16 − Ignition Coil P.16-2.
EXHAUST GAS RECIRCULATION (EGR) VALVE
Refer to GROUP 17 − Emission Control − Exhaust Gas Recircu-
lation (EGR) System P.17-12.
EVAPORATIVE EMISSION PURGE SOLENOID
Refer to GROUP 17 − Emission Control − Evaporative Emission
Control System
P.17-11.
INTAKE ENGINE OIL CONTROL VALVE
The intake engine oil control valve is installed on the left side of
the cylinder head. Receiving the duty signal from the ECM, the
intake engine oil control valve moves the spool valve position
and divides the oil pressure from the cylinder block into the
advanced chamber and the retarded chamber of the V.V.T.
sprocket as well as continually changes the intake camshaft
phase. The spring makes spool valve stop at the position
where the intake camshaft is at the most retarded angle when
the engine is stopped. The ECM moves the spool valve posi
-
tion by increasing and decreasing ON duty ratio of the intake
engine oil control valve and allows the intake camshaft to be at
the target phase angle. When the duty ratio increases, the
spool valve moves. The sprocket rotates toward the advanced
angle side. When the duty ratio decreases, the sprocket rotates
toward the retarded angle side. When the medium duty ratio, at
which the spool valve is at the medium position, is achieved, all
the oil passages are closed. This allows the phase angle to be
kept constant. The ECM changes and controls the duty ratio in
accordance with the engine operation to get the optimum
phase angle.
AK604740AD
Spool valve movement
Retard
chamber
Spring
Drain
Oil pressureCoil
Plunger
Drain Advance
chamber
AK602579
ECM
Intake engine oil
control valve12VOFF
ON
T50ms
0V
AD
From MFI relay
The longer the ON position, the more
advanced the intake camshaft angle

ACTUATOR
MULTIPORT FUEL SYSTEM (MFI)13A-26
EXHAUST ENGINE OIL CONTROL VALVE
The exhaust engine oil control valve is installed on the right
side of the cylinder head. Receiving the duty signal from the
ECM, the exhaust engine oil control valve moves the spool
valve position and divides the oil pressure from the cylinder
block into the advanced chamber and the retarded chamber of
the V.V.T. sprocket as well as continually changes the exhaust
camshaft phase. The spring makes spool valve stop at the
position where the exhaust camshaft is at the most advanced
angle when the engine is stopped. The ECM moves the spool
valve position by increasing and decreasing ON duty ratio of
the exhaust engine oil control valve and allows the exhaust
camshaft to be at the target phase angle. When the duty ratio
increases, the spool valve moves. The sprocket rotates toward
the retarded angle side. When the duty ratio decreases, the
sprocket rotates toward the advanced angle side. When the
medium duty ratio, at which the spool valve is at the medium
position, is achieved, all the oil passages are closed. This
allows the phase angle to be kept constant. The ECM changes
and controls the duty ratio in accordance with the engine oper
-
ation to get the optimum phase angle.
AK604747
Spool valve movement
Retard
chamber
Spring
Drain
Oil pressureCoil
Plunger
Drain Advance
chamber
AC
AK602579
ECM
Exhaust engine oil
control valve12VOFF
ON
T50ms
0V
AG
From MFI relay
The longer the ON position, the more
retarded the exhaust camshaft angle

FUEL INJECTION CONTROL
MULTIPORT FUEL SYSTEM (MFI)13A-29
FUEL INJECTION CONTROLM2132003001036
Fuel injection volume is regulated to obtain the opti-
mum air-fuel ratio in accordance with the constant
minute changes in engine driving conditions. Fuel
injection volume is controlled by injector drive time
(injection time). There is a prescribed basic drive
time that varies according to the engine speed and intake air volume. ECM adds prescribed compensa
-
tions to this basic drive time according to conditions
such as the intake air temperature and engine cool
-
ant temperature to decide injection time. Fuel injec-
tion is done separately for each cylinder and is done
once in two engine rotations.
System Configuration Diagram
1. INJECTOR ACTUATION (FUEL INJECTION)
TIMING
Injector drive time in case of multiport fuel injection (MFI) is
controlled as follows according to driving conditions.
AK604128AB
ECM InjectorMass airflow sensor
Intake air temperature sensor
Manifold absolute
pressure sensor
Engine coolant
temperature sensor
Accelerator pedal position sensor
Knock sensor
Intake camshaft position sensor
Ignition switch-ST
Heated oxygen sensor (front, rear) Crankshaft position sensor

FUEL INJECTION CONTROL
MULTIPORT FUEL SYSTEM (MFI)13A-32
Fuel Injection Volume Control Block Diagram
.
AK602278AD
Mass airflow sensor
Crankshaft
position sensor
Heated oxygen
sensor
Engine coolant
temperature
compensation Engine coolant
temperature sensor
Manifold absolute
pressure sensorFuel pressure
compensation Barometric pressure
sensor
Battery voltage
compensation Battery voltageBasic fuel
injection time
determinationAir fuel ratio
compensation
(Predetermined
compensation)
Heated oxygen
sensor feedback
compensation
Injector Acceleration-
deceleration
compensation