Active Wheel Speed Sensor Logic
Firing the “parts cannon” at an active ABS wheel speed sensor code often results in misdiagnosis and an unhappy customer. It may start with the wheel bearing hub unit or wheel speed sensor. If those parts do not resolve the problem, the technician may fire the parts cannon at the ABS hydraulic control module. Typically, the customer’s patience and wallet runs out before the car is fixed.
VIDEO: Wheel Speed Sensor Harness Repair And Electron Flow
Andrew Markel follows up on a previous video on wheel speed sensor harness repair, focusing on how voltage and electricity flow through the harness and how a splice may not last forever.
VIDEO: Pre-Loading Bearings: What’s Going On Inside?
Andrew Markel discusses pre-loading wheel bearings, and how it affects the geometry of the inside of the bearing.
VIDEO: Don’t Try To Repair A Wheel Speed Sensor Harness
Andrew Markel discusses wheel speed sensors, and how a repair should generally not be attempted on its wiring.
VIDEO: Wheel Speed Sensors And Steering
Andrew Markel discusses wheel speed sensors, and how they determine the turning state of a vehicle.
New Wheel Bearing Technology Will Change Your Replacement & Diagnostic Approach
Two technologies are now being used on new vehicles and in aftermarket replacement hub units that allow engineers to put better bearings in smaller packages. These technologies will change the way you replace and diagnose wheel bearings.
VIDEO: Probing A Wheel Speed Sensor Harness
Andrew Markel explains the proper way to probe a wheel speed sensor harness without damaging the insulation of the harness.
VIDEO: Clicking Noise After Wheel Hub Replacement
If a customer complains of a clicking noise after a hub unit has been replaced, two OEMs have each prepared their own solution to the problem, and they happen to be nearly identical.
Common Reasons For Wheel Bearing Failure
When a bearing wears out, it is usually a case of inadequate lubrication, faulty installation or improper adjustment. For the repair to be successful, you must first determine why the previous bearing failed. For sealed hub units, examining the internal bearings and races is impossible.
Impact Damage On Wheel Hubs
When a driver hits a pothole or curb hard enough, extreme forces are put onto the balls or rollers and races of the bearing. This can result in the formation of a very small mark on the surfaces. The driver might go 1,000 miles or more before these components start making noise.
