ABS system faults are not as easy to diagnose as many people think. Very often, when the ABS pump stops working and the brake system lights come on on the car's dashboard, mechanics without hesitation dismantle the ABS pump and either replace it or send it for repair without any prior diagnosis. This is a very big mistake and exposes the client to large and unnecessary costs.
The most important principle in searching for the causes of a faulty ABS system is computer diagnostics. Without understanding why, our customers often skip this important step, and yet without information about errors from the computer, repairing a car or the pump itself is like looking for a needle in a haystack. In times when cars are already full of electronics, this is a necessary condition for making a correct diagnosis.
Once we read the error codes from the diagnostic tester, write them down along with their descriptions and write down the ABS controller number. This is necessary information if you suspect that the driver is damaged.
If the errors read by the diagnostic computer indicate any sensors, first check the sensors themselves by inserting other ones. preferably original.
Very often the fault lies in the harness between the components. Electrical installation is another topic that mechanics don't like, because most of them check the installations by using a meter and using a meter. that's all. NO! The installation must also be checked for resistance, because a partially damaged cable will still conduct, but not enough current. This can be checked by connecting an appropriate bulb to the installation. You cannot also forget to check whether there is no puncture of the ground wire. This may be caused by, for example, a worn cable in contact with the car body. If there is no communication with the ABS controller, you should first rule out damage to the harness.
The last important element before we rely on a damaged ABS module is to adapt/calibrate the sensors if there are problems with them. Sometimes this solution solves the problem.
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