Circuit Description

The brake pedal position sensor (BPPS) is used by the body control module (BCM) to determine the brake pedal angle for various electrical components. The BPPS is a potentiometer type sensor with 3 circuits: a 10-volt reference circuit, a low reference circuit, a brake apply sensor signal circuit. The BCM provides the BPPS with 10 volts on the 10-volt reference circuit and a ground on the low reference circuit. Application of the BPPS rotate from the closed brake pedal position to the full apply position provides the BCM with a signal voltage from less than 1 volt to greater than 9 volts through the BPPS signal circuit. When the conditions for running this DTC are met, the BCM will use the brake fluid pressure sensor to determine if the predicted operating range of the BPPS is correct. If the BCM detects the BPPS voltage is out of the predicted range, the BCM will send a class 2 message to the electronic brake control module (EBCM) to set DTC C0161. The EBCM will set DTC C0131 or C0132 for a brake fluid pressure sensor fault. The BCM will set DTC C0277, C0278, or C0870 if a fault is detected in the BPPS.