Idle Speed/Throttle Actuator - Electronic: Description and Operation

ISC Solenoid Valve:

PURPOSE
The idle speed control (ISC) solenoid controls the amount of air allowed to bypass the throttle plate. Using this solenoid the ECU is able to accurately maintain correct idle speed.

LOCATION
The solenoid is located at the air cleaner on the right side of the engine compartment.

CONSTRUCTION
The ISC valve utilizes a duty solenoid design so that the amount of valve lift is determined by the operating frequency.

OPERATION
Whenever the engine is running, the ISC solenoid functions. The ECU uses a duty-cycle pulse to determine the rate of air flow through the solenoid.