Circuit Description

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 the following 3 circuits:

• A 5-volt reference
• A low reference
• A signal

The ECM provides the TP sensor with 5 volts on the 5-volt reference circuit, and a ground on the low reference circuit. The TP sensor provides a signal voltage that changes relative to throttle plate angle. The TP sensor signal voltage at idle is less than 0.5 volt. The TP sensor voltage is typically near 0 volt at idle, but could be as high as 0.5 volt. The TP sensor voltage should increase to above 4 volts at wide open throttle (WOT). If the ECM detects an excessively high signal voltage, this DTC sets.