Some vehicles also include a similar sensor in the accelerator pedal called "APP sensor". The TPS sensor is located in the throttle body. If your vehicle has an automatic transmission, the TPS sensor also influences the control of the gears. Signs that show that your Kia's TPS is faulty. Unstable idle speed; Lack of power; The car stalls TPS is usually located on the throttle valve spindle so that it can directly monitor its position. The TPS sensor is a potentiometer, providing a variable resistance depending on the position of the throttle valve (and hence throttle position sensor). The sensor signal is used by the engine control unit (ECU) as an input to its control system. htPt.