Wheel Sensor and Sensor Rotor

NOTE:

Wheel sensor of front wheel is installed on steering knuckle.
Sensor rotor of front wheel is integrated in wheel hub assembly.

Fig 1: Identifying Front Wheel Sensor
Courtesy of NISSAN NORTH AMERICA, INC.
Wheel sensor of rear wheel is installed on wheel hub assembly.
Sensor rotor of rear wheel is integrated in wheel hub assembly.
Never measure resistance and voltage value using a tester because sensor is active sensor.

Fig 2: Identifying Rear Wheel Sensor
Courtesy of NISSAN NORTH AMERICA, INC.
Downsizing and weight reduction are aimed goals. IC for detection portion and magnet for sensor rotor are adopted.
Power supply is supplied to detection portion so that magnetic field line is read. Magnetic field that is detected is converted to current signal.
When sensor rotor rotates, magnetic field changes. Magnetic field change is converted to current signals (rectangular wave) and is transmitted to ABS actuator and electric unit (control unit). Change of magnetic field is proportional to wheel speed.

Fig 3: Wheel Sensor Operation Diagram

Courtesy of NISSAN NORTH AMERICA, INC.