Throttle Position Sensor (TPS) - Monitors Throttle Valve Position
Throttle Position Sensor (TPS) – Monitors Throttle Valve Position

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Throttle Position Sensor (TPS) – Function – Failure – Testing


So, The throttle position sensor (TPS) monitors how far open the throttle valve (or blade) is open. Consequently, Determined by how far down the accelerator pedal has been pushed. Also, The throttle position controls the amount of air that flows into an engine’s intake manifold. So, The wider it is open, the more air is able to flow in. In contrast, The less that it is open, less air is able to flow in.

So, The position of the throttle and how quickly it’s opening and closing is transmitted to the (ECM). Consequently, The computer uses that information to decide, how much fuel is injected into the engine and the spark timing.

What can happen when it malfunctions:

  • It can trigger a “check engine” warning light
  • It causes the engine to idle roughly, surge, hesitate or stall

As a result, The engine control module (ECM) doesn’t know where the throttle position is. Therefore, It can not correctly set the fuel mixture or ignition timing.

Symptoms of a bad throttle position sensor (TPS):

  • Check engine light is on.
  • Engine has little or no acceleration.
  • Car bucks or jerks violently.
  • Engine surges and stalls out.
  • Engine starts and dies immediately.
  • Poor fuel economy.
  • Car goes into limp-home mode.

Replacing it can be straightforward, depending on the model, but the hardest part of the procedure is the diagnosis. As a result, You will need to have the proper diagnostic equipment.

So, It is a small sensor that’s about the size of your key fob. Also, It has an electrical connector attached to it, that normally houses three wires. On most engines, there are two smaller screws that secure it to the throttle body.

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