Enhanced Testing

P0506 - Idle Air Control System: RPM Lower than Expected






General Description
The Idle Speed Control Actuator (ISCA) is installed on the intake manifold 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.

DTC Description
If the actual engine speed is less than the target engine speed at idle, the ECM determines that a fault exists and a DTC is stored.

Detecting Condition and Specifications





Wiring Schematic