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Active Wheel Speed Sensor Diagnostics

There are two “types” of sensors generally found on the modern car – the passive speed sensor and the active speed sensor. They both perform the same function, but work entirely different. The passive speed sensor uses a magnet with fine copper wire wrapped around it to create its own alternating magnetic field. The polarity changes from positive to negative as the tone ring passes by the magnetic field. This frequency changes with wheel speed.

Servicing Wheel Bearings And Wheel Speed Sensors

If you are replacing a wheel bearing on a late-model vehicle, you will be dealing with a wheel speed sensor. In the past decade, wheel speed sensors have been moving from differentials, axles and knuckles to inside or on the wheel bearing or hub unit. At this location, the sensors are more accurate and often more protected from the elements.

Wheel Speed Sensor Diagnostics for Meters and Scopes

There is no way to quickly tell if a Wheel Speed Sensor (WSS) is passive or active. Both sensors have two wires and are located in the same position on the vehicle. Often, the service information will not indicate what types of sensors are on the vehicle

Wheel Speed Sensors: ABS and TCS Signal Use

The signals from the Wheel Speed Sensors (WSS) are the most important sensor input to the Brake Control Module (BCM) for ABS activation.

Selling Services: Wheel Speed Sensors

There are two main types of magnetic wheel speed sensors — passive and active. Both use a tone ring to reference against and each look very similar to one another.

Tech Tip: Diagnosing Wheel Speed Sensors

Wheel speed sensors (WSS) provide essential wheel speed information not only for anti-lock brake systems (ABS), but also for traction control and stability control systems. Some vehicles even compare the wheel speed sensor readings against the vehicle speed sensor (VSS) to make sure all of these sensors are accurate and working correctly. In some situations, it is also possible that the ….

Diagnosing Wheel Speed Sensors

Wheel speed sensors (WSS) provide essential wheel speed information not only for anti-lock brake systems (ABS), but also for traction control and stability control systems. Some vehicles even compare the wheel speed sensor readings against the vehicle speed sensor (VSS) to make sure all of these sensors are accurate and working correctly. In some situations,

Tech Tip: Ford Escape Wheel Speed Sensor Removal

When servicing the wheel speed sensors on a 2001-2005 Escape or 2005 Mariner and Escape Hybrid, care must be taken during removal to prevent damage. The wheel speed sensor wire has a body plug attached to it. This plug can be damaged if not removed correctly, such as removal for pinpoint testing. If the body plug is damaged, sensor replacement may be necessary even though the sensor is functional in all other respects.

Tech Tip: Replacing 2WD Front Wheel Speed Sensor on Isuzu Vehicles

If front wheel speed sensor diagnosis leads to replacement of the sensor with a related DTC, do not replace the complete hub assembly. A front wheel speed sensor is available for individual installation. Refer to the following service procedure when performing this repair.

Tech Tip: Replacing Wheel Bearing Hubs Equipped with Wheel Speed Sensors

When engineers came up with the idea of putting the wheel speed sensor (WSS) and tone ring inside a sealed wheel bearing hub assembly, it seemed like a great idea. The sealed environment would help protect the sensor and make it less vulnerable to damage or contamination from the outside world.