Tracer L4-110 1.8L DOHC (1995)
Idle Air Control (IAC) Valve: Description and Operation
Idle Speed Control (ISC) Solenoid
PURPOSE
The Idle Air Control (IAC) valve controls idle speed during all modes of engine operation.
OPERATION
The IAC valve receives duty cycle signals from from the Powertrain Control Module (PCM), controlling a rotary valve opening or closing the air
by-pass passage depending on the signal received. The valve will rotate to a half opened position as the signal from the PCM stops. This assures
bypass air to the engine is maintained as a fail-safe measure in the event of an electrical circuit malfunction.