Throttle Position Sensor: Description and Operation

PURPOSE
The Throttle Position (TPS) Sensor, mounted on and driven by the throttle body unit, is used by the Programmed Fuel Injection Electronic Control Module (PGM-FI ECM) to detect throttle movement and position.

OPERATION
A 5 volt reference signal is applied from the PGM-FI ECM and a ground signal. When the throttle is opened the sensor resistance changes which is read as a varying voltage signal. At idle position the sensor voltage is approx. 0.5 Volts and at full throttle approx. 4.5 Volts.