The throttle position sensor (TPS) monitors, how far open the throttle valve is open.

In other words, by how far down, the accelerator pedal has been pushed.

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.

Advances in technology, have allowed the throttle position sensor (TPS) to work; without actually needing contact with the throttle.

So, the position of the throttle and how quickly it’s opening and closing, is transmitted to the (ECM). As a result, 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, (TPS) include:

Replacing the throttle position sensor (TPS), can be straightforward, depending on the model. But, the hardest part of the procedure is the diagnosis. Therefore, 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.


Choose Your Throttle Position Sensor (TPS) Help Topic Below

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


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