Circuit Description

The Throttle Position (TP) sensor is a potentiometer, mounted on side of air control valve assembly (throttle body). TP sensor is actually 2 sensors within one housing.

TP sensor No. 1 signal voltage increases as throttle opens from less than 1.1 volt at zero percent throttle to greater than 3.7 volts at 100 percent throttle. TP sensor No. 2 signal voltage decreases from greater than 3.9 volts at zero percent throttle to less than 1.2 volt at 100 percent throttle.

Signal circuit for TP sensor No. 1 is pulled up to 5 volts and signal circuit for TP sensor No. 2 is pulled to ground through Throttle Actuator Control (TAC) module. DTC will set when TP sensor voltage is less than 0.13 volt or greater than 4.87 volts and conditions met for less than one second.