Throttle Position Sensor

THEORY

The throttle position switch is operated by the throttle. It has a set of contacts for both idle and full-throttle positions. The switch signals the throttle opening to the ECU, which provides mixture correction for both idle and off idle as well as full throttle conditions. These switches became a variable resistor potentiometer type in later systems. The engine ECU using a potentiometer TPS receives an analogue voltage signal that varies with throttle position. The advantage of this design is the ECU can determine the exact position of the throttle valve at any instant and can also see the rate of the driver’s throttle application.

PROCESS

In this I checked the voltage across the sensor I connected the voltmeter across the sensor the voltage was found to be 0.7V when the throttle was closed and it was 1V when the throttle was open.

REFLECTIONS

The throttle position sensor gives a reading which tells the ECU that how much fuel should be provided. The TPS gives less voltage when the throttle is closed as the throttle opens it increases the voltage. It tells the ECU how much fuel is required to be injected.