Mitsubishi Lancer Evolution 7. Manual — part 9
ENGINE -
Control System
1-15
CONTROL 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
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 l
oad signal
D
Power steering fluid pressure switch
D
Alternator FR terminal
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
Engine-ECU
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
ENGINE -
Control System
1-16
LIST OF COMPONENT FUNCTIONS
Name
Function
ECU
Engine-ECU
Uses the signals input from the various sensors to control operation of
actuators in accordance with the driving conditions.
Sensors
Ignition switch-IG
Detects the ON/OFF position of the ignition switch. When this signal
is input to the engine-ECU, power is supplied to components such as
the injectors, air flow sensor, idle speed control servo and crank angle
sensor.
Ignition switch-ST
Detects whether the engine is cranking. The engine-ECU controls the
fuel injection, throttle valve opening angle and ignition timing to the
appropriate settings based on this signal.
Air flow sensor
Detects the amount of intake air (volumetric capacity) by means of a
Karman vortex meter. The engine-ECU controls the basic injector drive
time based on this signal and on the engine speed.
Barometric pressure sensor
Detects the barometric pressure by means of a semiconductor
diffusion-type pressure sensor. The engine-ECU detects the vehicle’s
altitude based on this signal, and uses this to correct the fuel injection
amount so that the optimum air/fuel mixture ratio is obtained for that
altitude.
Oxygen sensor
Detects the concentration of oxygen in the exhaust gas by means of
zirconia and platinum electrodes. The engine-ECU judges whether the
air/fuel mixture ratio is at the optimum theoretical ratio based on this
concentration.
Intake air temperature sensor
Detects the temperature of the intake air by means of a thermistor. The
engine-ECU corrects the fuel injection amount to the correct amount
corresponding to the intake air temperature based on the voltage
output from this sensor.
Engine coolant temperature
sensor
Detects the temperature of the engine coolant by means of a
thermistor. The engine-ECU detects how warm the engine is based on
the signal from this sensor, and uses this to control the fuel injection
amount, idle speed and ignition timing.
Throttle position sensor
Detects the throttle valve opening angle by means of a potentiometer.
The engine-ECU controls the throttle valve and also determines the
optimum fuel injection for the vehicle’s degree of acceleration based
on the voltage output from this sensor.
Vehicle speed sensor
Detects the vehicle speed by means of a magnetic rheostatic element.
Camshaft position sensor
Detects the No. 1 cylinder compression top dead centre position by
means of a hall element.
Crank angle sensor
Detects the crank angle by means of a hall element. The engine-ECU
controls the injectors based on the signal from this sensor.
Alternator FR terminal
Detects the energising duty ratio of the alternator field coil.
Power steering fluid pressure
switch
Detects whether there is a power steering load present by means of a
contact switch.
A/C switch
Detects the ON/OFF condition of the A/C.
ENGINE -
Control System
1-17
Name
Function
Sensors
A/C load signal
Inputs the compressor drive state (low load/high load) to the
engine-ECU. The engine-ECU controls the A/C idle-up revolution
speed using this signal.
Intercooler water spray switch
(automatic)
Sprays water when certain driving conditions are satisfied.
Intercooler water spray switch
(manual)
Sprays water while the switch is being pressed by the driver.
Diagnosis control terminal
Notifies the engine-ECU that the MUT-II has been connected to the
diagnosis connector, and enables communication between the MUT-II
and the engine-ECU.
Actuators
Engine control relay
Turns the engine-ECU power circuit on and off.
Injector
Drives the fuel injection by means of drive signals from the
engine-ECU.
Ignition coil
(integrated power transistor)
Interrupts the ignition coil primary current in accordance with the
ignition signals from the engine-ECU, in order to generate a high
voltage for ignition.
Idle speed control servo
The throttle valve bypass air amount during idling and deceleration is
controlled with the signal from the engine-ECU.
Fuel pump relay 1
Supplies power to the fuel pump when the ignition switch is at the ON
position.
Fuel pump relay 2
Controls the supply of power to the fuel pump in accordance with the
signal from the engine-ECU.
Fuel pump relay 3
Controls the supply of power to the fuel pump when driving at low loads
and when driving at high loads, in accordance with the signal from the
engine-ECU.
Fan controller
Controls the smooth operation of the radiator fan in accordance with
the signal from the engine-ECU.
Condenser fan relay (HI)
Controls the condenser fan operation (high speed) in accordance with
the signal from the engine-ECU.
Condenser fan relay (LOW)
Controls the condenser fan operation (low speed) in accordance with
the signal from the engine-ECU.
Intercooler water spray relay
Controls the driving of the intercooler spray motor in accordance with
the signal from the engine-ECU.
Waste gate solenoid valve
Controls the supercharging pressure which acts on the waste gate
actuator in accordance with the signal from the engine-ECU.
Purge control solenoid valve
Controls the purge air flow amount which is introduced into the surge
tank in accordance with the signal from the engine-ECU.
EGR control solenoid valve
Controls the negative pressure which operates the EGR valve in
accordance with the signal from the engine-ECU.
Secondary air control solenoid
valve
Controls the pressure which is introduced into the secondary air valve
in accordance with the signal from the engine-ECU.
Fuel pressure control solenoid
valve
Controls the fuel pressure in accordance with the signal from the
engine-ECU.
ENGINE -
Control System
1-18
Name
Function
Actuators
Alternator G terminal
Controls the current generated by the alternator in accordance with the
signal from the engine-ECU.
A/C relay
Controls the A/C compressor operation.
Engine warning lamp
(check engine lamp)
Illuminates when a sensor malfunction is detected to warn the driver
of the problem.
Intercooler water spray lamp
Illuminates when the intercooler is being sprayed in accordance with
the signal from the engine-ECU.
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