The job of the (TPS) is to monitor the throttle valves position.

The  (TPS) sensor reports the position of the throttle valve to your (ECU)

The throttle position sensor (TPS) monitors how far open the throttle valve (or blade) is open, which is determined by how far down the accelerator pedal has been pushed.

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

The ECM uses this information to adjust fuel metering, ignition timing, and emissions. Since it contains both electrical and mechanical parts, the throttle position sensor can be prone to failure. So, If this happens it will send voltage readings to the ECM that are out of spec, illuminating the CEL. At this point, the ECM doesn’t “know.”

In some instances, problems with a TPS might originate from a bad electrical connection or corroded contacts on the connector. Be sure to check this before going any farther.

Use your multimeter for diagnosis—the readings from the TPS should be between 5 volts at WOT and under 1 volt at idle, depending on your vehicle (check a service manual for the exact parameters of these voltages). The throttle position sensor is located near the throttle body itself. As a result, You may need to move or remove the alternator, serpentine belt, and air intake tube to get easy access to it. On some vehicles, it may be necessary to reprogram the ECM so that it can “relearn” the proper shift points for the transmission.

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