Sub-Throttle Position (Sub-TP) Sensor (With TRAC)

Vehicles with Traction Control (TRAC) system are equipped with a secondary (sub) throttle plate that is controlled by an electric actuator. The ECM monitors the angle of this sub-throttle plate by applying a reference voltage to the sub-TP sensor, which operates like the TP (main) sensor. Sub-TP sensor also contains an idle switch.