Andrew Markel discusses wheel speed sensors, and how they determine the turning state of a vehicle. Sponsored by BCA Bearings.
Ride-height sensors not only measure the position of the suspension, but also the rate of movement. They are supplied with a voltage of around 5 volts. The signal voltage is changed as a magnet moves past a coil. Most sensors have three wires — ground, power and signal.
Internally, it is difficult to damage one of these sensors. Externally, the linkage that connects the sensor to the suspension arm can also be damaged. The connector can be damaged and cause a short or open and a code will be set. If one of these sensors is replaced, it must be calibrated after it is installed.
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When performing a calibration, you are adjusting the connection between the sensor, vehicle and surroundings.
For the technician, it can be frustrating. The wheel speed sensors are some of the longest circuits in the vehicle.
There are two types of wheel speed sensors, active and passive.This video is sponsored by BCA Bearings by NTN.