Throttle Position (TP) Sensor

The throttle position (TP) sensor is located on the throttle body.

It supplies information to the PCM about the position of the throttle plate. The TCM receives the signal from the PCM.

It also detects the speed of actuation of the throttle plate.

The TCM uses the signals for the following functions, among other things:

• to determine the shift timing.
• to control the main line pressure.
• to control the torque converter clutch.
• for kickdown.

In case of absence of the TP signal, the engine control uses the signals of the mass air flow (MAF) and intake air temperature (IAT) sensors as a substitute signal. The main line pressure is increased and hard shifts may occur.