DTC P0506: Idle Air Control System-RPM Lower Than Expected: General Description

The idle speed is controlled by the Electrical Throttle Control (ETC) System. The ETC system is composed of the throttle motor to operate the throttle valve, and the Throttle Position Sensor (TPS) to detect the opening angle of the throttle valve; the Accelerator Pedal Position Sensor (APS) detects the accelerator pedal position and a one valve type throttle body. The ECM/PCM controls the throttle motor to provide the proper throttle valve opening angle for the commanded engine RPM.