Subaru impreza 2002 Service Manual page 20

Fuel Injection (Fuel System)
5. Control System
B: INPUT AND OUTPUT SIGNALS
Signal
Pressure sensor
Mass air flow and intake air tempera-
ture sensor
Throttle position sensor
Front oxygen (A/F) sensor
Rear oxygen sensor
Exhaust gas temperature sensor
(Except STi model)
Tumble generator valve position sen-
sor (Except STi model)
Crankshaft position sensor
Camshaft position sensor
Variable valve timing camshaft posi-
Input signals
tion sensor (Only STi model)
Engine coolant temperature sensor
Knock sensor
Vehicle speed sensor
Ignition switch
Starter switch
Neutral position switch
Heater circuit of front and rear oxy-
gen sensor
A/C switch
Fuel level sensor
Small light switch
Blower fan switch
Rear defogger switch
Fuel Injector
Ignition signal
Fuel pump controller
A/C control relay
Radiator fan control relay
Idle air control solenoid valve
Output signals
Tumble generator valve actuator
(Except STi model)
Wastegate control solenoid valve
Malfunction indicator lamp
Purge control solenoid valve
Power supply
Variable valve timing solenoid valve
(Only STi model)
CONTROL SYSTEM
Unit
Detects the amount of intake air (Measures the absolute pressure).
Detects the temperature and amount of intake air.
Detects the throttle valve position.
Detects the density of oxygen in exhaust gases at the upstream of
the front catalytic converter.
Detects the density of oxygen in exhaust gases at the downstream
of the rear catalytic converter.
Detects the exhaust gas temperature.
Detects the tumble generator valve position.
Detects the crankshaft angular position.
Detects the combustion cylinder.
Detects amounts of advance and retard angles of the intake valves.
Detects the engine coolant temperature.
Detects engine knocking.
Detects the vehicle speed.
Detects operation of the ignition switch.
Detects the condition of engine cranking.
Detects that the gear is in neutral.
Detects the abnormality in heater circuit of front and rear oxygen
sensor.
Detects ON-OFF operation of the A/C switch.
Detects the level of the fuel in the fuel tank.
Detects ON-OFF operation of the small light switch.
Detects ON-OFF operation of the blower fan switch.
Detects ON-OFF operation of the rear defogger switch.
Activates an injector.
Turns the primary ignition current ON or OFF.
Controls the fuel pump.
Turns the A/C control relay ON or OFF.
Turns the radiator fan control relay ON or OFF.
Adjusts the amount of air flowing through the bypass line in the
throttle body.
Operates the tumble generator valve.
Controls supercharging pressure
Indicates existence of abnormality.
Controls purge of evaporative gas absorbed by the canister.
Controls ON/OFF of the main power supply relay.
Controls advance and retard angles of the intake valves.
FU-4
Function