OBDII - Components - Throttle Position Sensor

Throttle Position Sensor

- Last Edited: Aug 27, 2023
- Popularity: 24,022 Views


A Throttle Position Sensor (TPS) is a sensor that measures the position of the throttle valve in an internal combustion engine. The TPS is usually located on the throttle body, which is the component that controls the amount of air that enters the engine.

The TPS is a potentiometer, which means that it has a variable resistor that changes resistance as the throttle valve moves. The TPS sends a signal to the Engine Control Unit (ECU), which uses the signal to determine the amount of fuel to inject into the engine and the spark timing.

The TPS is an important sensor in the engine management system. If the TPS fails, the ECU will not be able to determine the position of the throttle valve, and the engine may not run properly.

Here are some of the symptoms of a bad throttle position sensor:

      • Engine idles rough or stalls.
      • Engine hesitates when accelerating.
      • Check engine light comes on.
      • Poor fuel economy.

If you experience any of these symptoms, it's a good idea to have your TPS checked by a mechanic.

Here are some of the causes of a bad throttle position sensor:

      • Physical damage to the sensor.
      • Corrosion or dirt on the sensor.
      • Electrical problems with the sensor.

If your TPS is bad, it will need to be replaced. The cost of replacing a TPS will vary depending on the make and model of your car.

Here are some tips to prevent your TPS from failing:

      • Keep the sensor clean and free of dirt and corrosion.
      • Inspect the sensor for signs of physical damage.
      • Have the sensor checked regularly by a mechanic.

By following these tips, you can help to prevent your TPS from failing and keep your engine running smoothly.

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