DTC P0507: Idle Speed High: Description

WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The ECM can control idle speed by electrically controlling the throttle plate, advancing/retarding spark timing or increasing/decreasing the air/fuel ratio. The ability for the ECM to control the throttle plate is performed by the use of a throttle body with Throttle Actuator Control (TAC). The throttle contains a DC motor along with two independent throttle position sensors, which relay the position of the throttle plate. The throttle plate is held open 34 percent by the use of spring pressure for maximum idle air. The throttle plate is also held closed by spring pressure, which keeps the throttle in the idle position in the event of a motor circuit malfunction. The ECM monitors the throttle actuator control system for faults in the TP sensors, TAC motor circuit and for a correlation between the actual and desired throttle plate position. The ECM also compares its commanded idle speed to the actual idle speed to ensure idle control is in check. DTC P0507 will set if the actual idle speed is greater than a calibrated amount from the ECM commanded idle speed after a certain period of time.