Idle Speed/Throttle Actuator - Electronic: Description and Operation

PURPOSE/OPERATION
The idle air control solenoid valve consists of an air cut valve, duty control valve, intake air passage and a coolant passage. The air cut valve contains a bimetallic substance which responds to coolant temperature, and a duty control valve which is operated by a signal sent from the Engine Control Module (ECM).





When engine coolant temperature is low, the air cut valve is fully opened by the action of the bimetallic substance so that the air flow required for low engine coolant temperatures is maintained. The ECM controls the duty control valve to bring the operating engine speed as close to preset idle speed as possible.