Component Functional Description - Brake Pedal Position Sensor

The Non-eBooster systems use a single Brake Pedal Position Sensor mounted on the Brake Pedal assembly. The PCM 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 PCM. The PCM 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 ABS Module and PCM. These thresholds must be re-learned using the scan tool every time a sensor, ABS Module or PCM is replaced. If these thresholds are not learned, a performance fault will set.