P1220 CHEVROLET - Throttle Position Sensor 2 Circuit
Faulty Throttle Position (TP) Sensor
Throttle Position (TP) Sensor harness is open or shorted
Throttle Position (TP) Sensor circuit poor electrical connection
Engine Light ON (or Service Engine Soon Warning Light)
P1220 Chevrolet Description
The Throttle Position (TP) Sensor is mounted on the throttle body of the Throttle Actuator Control (TAC) assembly. The sensor is actually 2 individual throttle position sensors within 1 housing. Two separate signal circuits, a low reference circuit, and a 5-volt reference circuit are used in order to connect the TP sensor assembly and the TAC module. The TP sensor signal voltage increases as the throttle opens. The signal circuit for TP sensor is pulled up to 5-volt reference voltage.