DTC P0123: Throttle Position Sensor 1 Signal Circuit High Input: General Description

The ETC (Electronic Throttle Control) system which is composed of throttle body, the TPS (Throttle Position Sensor) 1&2 and the APS (Accelerator Position Sensor) 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 TPS is a variable resistance and its value is changed by open angle of throttle valve.