Throttle Position Sensor

The Throttle Position (TP) sensor is a potentiometer mounted on the throttle body. The PCM receives a signal from the TP sensor relaying throttle plate position. PCM uses TP sensor signal to help determine EPC pressure, shift scheduling and TCC operation. TP sensor failure will cause PCM to operate in fail safe mode and raise line pressure to prevent transmission damage. This condition will result in harsh engagements, firm shift feel, abnormal shift schedule, and TCC not engaging or cycling.