Circuit Description
WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
The throttle position (TP) sensors 1 and 2 are located within the throttle body assembly. Each sensor has the following components:
- A 5-volt reference circuit
- A low reference circuit
- A signal circuit
This provides the engine control module (ECM) with a signal voltage proportional to throttle plate movement. TP sensor 1 signal voltage at closed throttle is near the 5-volt reference and decreases as the throttle plate is opened. TP sensor 2 signal voltage at closed throttle is near the low reference and increases as the throttle plate is opened. If the ECM detects the TP sensor 2 signal voltage is not within the predicted range, DTC P0220 sets.