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Throttle Position Sensors (TPS) is a variable resistance sensor on the throttle body that continuously sends a varying voltage signal, which is proportional to the throttle valve position, to the electronic control module. It monitors the air intake of an engine. The sensor is usually located on the butterfly spindle/shaft to directly monitor the position of the throttle. TPS is a type of accelerator pedal sensor, which often includes a wide-open throttle (WOT) sensor.

  • The throttle body contains the throttle valve. The assembly usually mounts on the intake manifold. The throttle valve connects by linkage to the accelerator pedal in the driver's compartment.
  • Depressing the accelerator pedal opens the throttle valve. Then more air flows through and enters the engine. The electronic control module must always know the position of the throttle valve. The ECM must match the fuel flow with the airflow to the engine the proper air-fuel mixture.
  • The throttle position sensor on the throttle body continuously reports throttle position

Throttle Pressure

In a hydraulically operated automatic transmission, It refers to the pressure applied to one end of the shift valve that changes as engine throttle position or intake manifold vacuum changes  

Throttle Body Injection

A gasoline fuel-injection system that sprays fuel under pressure into the intake air passing through the throttle body on the intake manifold. It is also called a single-point injection