Subaru 2002 Impreza Service Manual page 20

I
Fuel Injection (Fuel System)
AIR LINE
C: ATMOSPHERIC PRESSURE SENSOR
The atmospheric pressure sensor converts pressure values into electric signals, and sends the
signals to the ECM.
NF0007
(1) Sensor unit
(2) O-ring
(3) Case
(4) Pipe
(5) Through capacity
(6) Terminal
(7) Inner lead
(8) Resin
(9) Metal lid
D: THROTTLE BODY
In response to operation of the accelerator pedal, the throttle valve in the throttle body opens/
closes to regulate the volume of the air drawn into the combustion chamber.
0
During idling, the throttle valve is almost fully closed and the volume of air passing through the
throttle body is less than that passing through the idle air control solenoid valve.
0
More than half of the air necessary for idling is supplied to the intake manifold via the idle air
control solenoid valve which controls properly the engine idling speed, so the idling speed needs
not be adjusted.
FU-4