Abs Diagnostics For Semi Trailers
Conduct a visual inspection of the ABS components, including sensors, wiring harnesses, connectors, and the ABS control module. Look for signs of damage, corrosion, or loose connections.
Test the ABS wheel speed sensors to ensure they are functioning properly. This may involve using a multimeter to measure resistance or performing a dynamic test while driving the vehicle.
Inspect the wiring harnesses for any signs of damage or wear. Ensure that the wiring is properly connected and routed to prevent interference or short circuits.
Frequently Asked Questions 
The most common way that a truck driver or owner-operator can potentially diagnose ABS problems on their own is to stay aware of any changes in brake performance and watch for symptoms of a failing ABS module. A major indicator is brake pedals failing to respond with the same amount of force or even locking up while in use. The failing module will cause erratic operation.
It isn’t uncommon to have an ABS module need replacement after 10 to 15 years, but it is also possible that your rig may need one after just 100,000 to 200,000 miles. The best way to ensure that your ABS module is still performing properly is to make sure that you test it often and keep a close eye out for problems.
The ABS light coming on may be normal functionality, or it can indicate a problem. When the key is inserted and the system is powered up, the ABS system should trigger the ABS light in the dashboard for a brief period. This indicates that the system has powered up and that there are no error conditions. In some trucks, the light may only come on when the trailer is first plugged in.