Circuit Description
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
The accelerator pedal position (APP) sensor 1 is a potentiometer type sensor with the following 3 circuits:
- A 5-volt reference circuit
- A low reference circuit
- A signal circuit
The control module provides the APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensor then provides the control module a signal voltage proportional to pedal movement. The APP sensor 1 signal voltage is low at rest and increases as the pedal is depressed. When the control module detects that the APP sensor 1 signal or the APP sensor 5-volt reference voltage is outside the predetermined range, DTC P2120 sets.