Hyundai Elantra HD: Idle Speed Control Actuator (ISCA). Description and Operation
Function And Operation Principle
The Idle Speed Control Actuator (ISCA) is installed on the throttle body
and controls the intake airflow that is bypassed around the throttle plate to
keep constant engine speed when the throttle valve is closed. The function of
the ISCA is to maintain idle speed according to various engine loads and conditions,
and also to provide additional air during starting. The ISCA consists of an
opening coil, a closing coil, and a permanent magnet. Based on information from
various sensors, the ECM controls both coils by grounding their control circuits.
According to the control signals from the ECM, the valve rotor rotates to control
the by pass airflow into the engine.
