Throttle Position Sensor: Testing and Inspection

When the PCM detects a malfunction with the TP sensor circuits, the following DTCs will set:

^ DTC P1120 Throttle Position TP Sensor 1 Circuit.
^ DTC P1220 Throttle Position TP Sensor 2 Circuit.
^ DTC P1221 Throttle Position TP Sensors 1, 2 Performance.