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What does a Throttle Position Sensor do for your vehicle?

intake manifold and throttle body

Throttle Position Sensor (TPS)The throttle position sensor moves with the throttle and sends a voltage signal to the computer indicating throttle angle and speed of movement data. The computer uses this data to measure engine load, adjust timing, fuel delivery, EGR, converter clutch operation and clear flood mode.

Where are these sensors located?

The throttle position sensor is mounted on the throttle body.

Will a malfunctioning TPS illuminate the check engine light or affect vehicle operation?

A failing throttle position sensor can illuminate the malfunction indicator lamp (MIL), and cause the engine to hesitate upon acceleration or experience idling problems.

What are the common causes of failure?

Typically these sensors fail due to the constant contact of the movable wiper arm over the sensor element and the exposure to the high under hood heat.

How to determine if these sensors are malfunctioning?

Look for smooth voltage changes on the signal wire as the throttle plate is being opened and closed. The diagnostic codes range from P0120 through P0125.

Check out all the relays, sensors and switches available on NAPA Online or trust one of our 17,000 NAPA AutoCare locations for routine maintenance and repairs. For more information on your vehicle’s throttle position sensor, chat with a knowledgeable expert at your local NAPA AUTO PARTS store.

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