Corolla Sedan 4-Door L4-1587cc 1.6L DOHC MFI (1997)
Idle Speed/Throttle Actuator - Electronic: Description and Operation
System Schematic
CIRCUIT DESCRIPTION
The rotary solenoid type IAC valve is located on the throttle body and intake air bypassing the throttle valve is directed to the IAC valve through a
passage. In this way the intake air volume bypassing the throttle valve is regulated, controlling the engine speed.
The ECM operates only the IAC valve to perform idle-up and provide feedback for the target idling speed.
