Left Rear Wheel Speed Sensor And Right Rear Wheel Speed Sensor
The rear wheel speed sensors are inputs to the brake ECM. The speed sensors are designed to inform the ECM when the axle ratio is approximately 1.6 to 1. The brake ECM sends a signal to the selector valves and the proportional valves. The selector valves and proportional valves activate the parking brake of the affected wheel. The brake ECM sends a signal to the parking brake. The ECM signal will release the parking brake when the ratio of the right axle and the ratio of the left axle are 1 to 1.
The rear wheel speed sensors are frequency sensors. The rear wheel speed sensors are located on the drive axle. The sensor generates an AC signal. The ECM measures the frequency of the signal and the ECM responds accordingly to the signal. The diagnostic status of the sensors are available to other modules through the CAT Data Link.
The left rear wheel speed sensor is connected to the brake ECM through contact C. The sensor is being supplied with +10V. The sensor receives power from the brake ECM through contact A. The sensor contact B is connected to ground.
