Subaru LEGACY 2002 Quick Reference Index page 84

Fuel Injection (Fuel System)
B: INPUT AND OUTPUT SIGNALS
Signal
Intake air temperature and pressure
sensor
Throttle position sensor
Oxygen sensor*
Crankshaft position sensor
Camshaft position sensor
Engine coolant temperature sensor
Knock sensor
Vehicle speed sensor
Ignition switch
Input signals
Starter switch
Neutral position switch (MT)
Park/Neutral position switch (AT)
Torque control signal (AT)
Heater circuit of oxygen sensor*
Diagnostics of AT-ECU
A/C switch
Small light switch
Blower fan switch
Rear defogger switch
Fuel Injector
Ignition signal
Fuel pump relay
A/C control relay
Radiator fan control relay
Output signals
Idle air control solenoid valve
Malfunction indicator lamp
Purge control solenoid valve
Power supply
*: With catalytic converter
CONTROL SYSTEM
Unit
Detects the temperature of intake and amount of intake air (Measures
the absolute pressure).
Detects the throttle valve position.
Detects the density of oxygen in exhaust gases at the upstream of the
front catalytic converter.
Detects the crankshaft angular position.
Detects the combustion cylinder.
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 shift positions.
Controls engine torque.
Detects abnormality in the heater circuit of the oxygen sensors.
Detects the self-diagnostics of the AT-ECU.
Detects ON-OFF operation of the A/C switch.
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.
Turns the fuel pump relay ON or OFF.
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.
Indicates existence of abnormality.
Controls purge of evaporative gas absorbed by the canister.
Control ON/OFF of the main power supply relay.
FU-26
Function