Subaru 2002 Impreza Service Manual page 78

CONTROL SYSTEM
Fuel lniection (Fuel
System)
Unit
Pressure sensor
B: INPUT AND OUTPUT SIGNALS
Function
Detects the amount of intake air (Measures the absolute pressure).
Signal
Mass air flow and intake air tempera-
ture sensor
Input signals
Detects the temperature and amount of intake air.
Tumble generator valve position sen-
sor
Crankshaft position sensor
Detects the tumble generator valve position.
Detects the crankshaft angular position.
I
Throttle position sensor
I
Detects the throttle valve position.
Diagnostics of TCM (AT)
Torque control signal (AT)
NC switch
Fuel level sensor
Fuel temperature sensor
Fuel tank pressure sensor
Small light switch
Blower fan switch
Rear defogger switch
Front oxygen (NF) sensor
~~
Detects the self-diagnostics of the TCM.
Controls engine torque.
Detects ON-OFF operation of the N C switch.
Detects the level of the fuel in the fuel tank.
Detects the temperature of the fuel in the fuel tank.
Detects the evaporation gas pressure 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.
Detects the density of oxygen in exhaust gases at the upstream of
the front catalytic converter.
Rear oxygen sensor
Detects the density of oxygen in exhaust gases at the downstream
of the rear catalytic converter.
Exhaust gas temperature sensor
I
Detects the exhaust gas temperature.
Camshaft position sensor
I
Detects the combustion cylinder.
Engine coolant temperature sensor
I
Detects the engine coolant temperature.
Knock sensor
I
Detects engine knocking.
Vehicle speed sensor
I
Detects the vehicle speed.
Ignition switch
I
Detects operation of the ignition switch.
Starter switch
I
Detects the condition of engine cranking.
Neutral position switch (MT)
I
Detects that the gear is in neutral.
ParWNeutral position sensor (AT)
I
Detects shift positions.
Heater circuit of front and rear oxy-
gen sensor sensor.
Detects the abnormality in heater circuit of front and rear oxygen
FU-28