DTC P050A-00: Cold Start Idle Air Control System Performance: General Description

The Electronic Throttle Control (ETC) system which is composed of throttle body, the Throttle Position Sensor (TPS) 1, 2 and the Accelerator Position Sensor (APS) 1, 2 controls the mass of airflow by driver's intention. The throttle valve opening is controlled by throttle motor which is controlled by the PCM. The Throttle Position Sensor (TPS) is a variable resistance and its value is changed by open angle of throttle valve.