Monitors the position of the accelerator pedal and throttle linkage so the computer can make accurate air/fuel mixture adjustments.
The Throttle Position (TP) sensor and accelerator pedal position (APP) sensor are the only sensors sending data to the Powertrain Control Module (PCM) that the vehicle operator has direct control over. The TP sensor is a three wire potentiometer that provides an analog signal to the computer. This signal represents how far the throttle plates have opened.
The Powertrain Control Module calculates how much air should have entered the engine and compares this value with the Manifold Absolute Pressure (MAP) sensor or Mass Air Flow (MAF) sensor value. The PCM uses this information to calculate fuel delivery and ignition timing requirements.
The PCM on vehicles equipped with an electronic transmission utilize the TP sensor in combination with the MAP and MAF sensor values to determine shift schedules and torque converter clutch application.