How to Perform Trouble Diagnoses for Quick and Accurate Repair: Introduction
The ABS system has an electronic control unit to control major functions. The control unit accepts input signals from sensors and instantly drives the actuators. It is essential that both kinds of signals are proper and stable. It is also important to check for conventional incidents: such as air leaks in booster lines, lack of brake fluid, or other incidents with the brake system.
It is much more difficult to diagnose an incident that occurs intermittently rather than continuously. Most intermittent incidents are caused by poor electric connections or faulty wiring. In this case, careful checking of suspicious circuits may help prevent the replacement of good parts.
A visual check only may not find the cause of the incidents, so a road test should be performed.
Before undertaking actual checks, take a few minutes to talk with a customer who approaches with an ABS complaint. The customer is a very good source of information on such incidents; especially intermittent ones. By talking to the customer, find out what symptoms are present and under what conditions they occur. Start your diagnosis by looking for "conventional" incidents first. This is one of the best ways to troubleshoot brake incidents on an ABS controlled vehicle.
Also check related Service bulletins for information.