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Throttle Position Sensor

The Throttle Position (TP) sensor is used by the Engine Control Module (ECM) to determine the throttle plate angle for various engine management systems. The TP sensor is a potentiometer type sensor with 3 circuits:

The ECM provides the TP sensor with 5 volts on the 5-volt reference circuit and a ground on the low reference circuit. Rotation of the TP sensor rotor from the closed throttle position to the Wide Open Throttle (WOT) position provides the ECM with a signal voltage from less than 1 volt to more than 4 volts through the TP sensor signal circuit. If the ECM detects an excessively low signal voltage, DTC P0122 sets. If the ECM detects an excessively high signal voltage, DTC P0123 sets.

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