Theory Of Operation

The Electronic Throttle Control (ETC) system uses two Throttle Position Sensors (TPS) to monitor the throttle blade position. TPS 1 and TPS 2 are located within the Throttle Body assembly. Each sensor has its own Signal circuit (TPS 1 or TPS 2). Both sensors share a 5-volt reference circuit (Supply) and a low reference circuit (Sensor Return). Processors within the Powertrain Control Module (PCM) monitor the ETC system data. Each Signal circuit provides the processors with a signal voltage proportional to throttle blade movement. The processors share and monitor data to verify that the indicated TPS calculation is correct.