Throttle Position Sensor / Throttle Potentiometer
1. What is a throttle position sensor and what is its function in the car?
Latest fuel injection engine models use a throttle position sensor (TPS) to inform the powertrain control module (PCM) about the throttle opening rate and its position. The PCM then uses this information to control many output data such as fuel control.
2. What are the symptoms of a faulty throttle position sensor?
A faulty TPS can create many problems, the most common being hesitation or misfires during acceleration. Normally, the Check Engine Light (CEL) is also illuminated. Other symptoms may include (non-exhaustive list): changes in power and response, increased emissions, irregular engine operation, and poor idle quality.
3. How can I check if my throttle position sensor is broken?
Generally, if there is a problem with the TPS or its circuits, a diagnostic trouble code (DTC) will be recorded and the Check Engine Light (CEL) will illuminate. If the light is on, you can plug a diagnostic tool into the designated port under the dashboard and read the error codes listed. If the code indicates a problem with the TPS or its circuits, the vehicle-specific repair manual should be consulted before proceeding with further tests.
4. How do I change the throttle position sensor?
The method for replacing a TPS varies from vehicle to vehicle, but it is quite simple in most cases. Specific repair information should be consulted before you replace your TPS. A typical TPS replacement proceeds as follows:
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Disconnect the negative terminal of the battery.
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Disconnect the electrical connector from the TPS.
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Remove the TPS mounting screws.
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Remove the TPS.
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Reinstall in the reverse order of removal.
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Adjust the TPS if necessary.