Air Line - Subaru LEGACY 2002 Quick Reference Index

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Fuel Injection (Fuel System)

D: THROTTLE POSITION SENSOR

The throttle position sensor is mounted in the throttle body and linked to the throttle valve.

The throttle position sensor sends the ECM voltage signal corresponding to the opening of the

throttle valve. When the sensor's output voltage exceeds a predetermined level, the ECM inter-

prets it as complete closure of the throttle valve. When the output voltage is at another predeter-

mined level, the ECM recognizes that the throttle valve is at a wide open position. Since the output

characteristics of the sensor change over years, the ECM is provided with a learning function to

be able to interpret signals into throttle valve angles always correctly.

E: IDLE AIR CONTROL SOLENOID VALVE

The idle air control solenoid valve is located in the throttle body and regulates the amount of

intake air that flows bypassing the throttle valve into the intake manifold during engine idling. It is

activated by a signal from the ECM in order to maintain the engine idling speed at a target speed.

The idle air control solenoid valve is a solenoid-actuated rotary valve consisting of a coil, rotary

valve, spring and housing. The housing is an integral part of the throttle body and provided with a

bypass air port whose opening area is changed by the rotary valve.

AIR LINE

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