Component Functional Description - 3 Wire Brake Pedal Position Sensor

NON-eBOOSTER SYSTEMS: 3-Wire Position Sensor  - The Non-eBooster systems use a single Brake Pedal Position Sensor mounted on the Brake Pedal assembly. The BSCM provides the sensor with a 5-Volt reference, a pull down signal and sensor ground circuit. Using a pull down signal means that there will be 0 volts on the signal circuit when the connector is unplugged. The sensor is hard-wired to the BSCM. The BSCM converts the analog voltage signal to a digital signal and broadcasts it on the CAN bus. When the pedal is not pressed, the signal voltage is low. As the driver presses on the Brake Pedal, the voltage on the signal increases. The Minimum (Not pressed) and maximum (Pedal fully pressed) thresholds for the sensors are learned into the BSCM and PCM. These thresholds must be re-learned using the scan tool every time a sensor, BSCM or PCM is replaced. If these thresholds are not learned, a performance fault will set. 

eBOOSTER SYSTEMS: Single Edge Nibble Transmission (SENT) Sensors  - The eBooster system uses two SENT interface protocol sensors used to detect brake pedal travel. These sensors are internal to the Hydraulic Control Unit assembly. As the driver presses on the Brake Pedal, the Brake Pedal Position Sensors send an output only digital signal to the BSCM in percentage of travel. These sensors consist of three circuits, a power supply and ground circuit to function, and a digital output signal circuit. The power supply range is typically between 4.75 and 5.25 volts.