ABS fault light on
The components of the ABS anti-lock braking system are relatively simple and clear, so it is relatively simple to analyze the cause of the ABS fault light.
1. ABS wheel speed sensor problem.
The wheel speed sensor is arranged on the wheel, which is easily contaminated by mud and mud. The sensor is covered with a lot of mud, which will affect the transmission of the speed signal. The ABS computer cannot judge the speed signal, and it will alarm. At this time, clean the dirt on the sensor. Adjust the gap between the sensor and the signal gear
That's it. If the wheel speed sensor is damaged, it should only be replaced.
2. Line connection failure
This is also a relatively common fault. Although each car has an ABS system, the assembly quality and materials are actually different due to different processes. There are many faults in the loose connection of the wheel speed sensor, which can be mainly checked. The investigation of the circuit is a very troublesome thing, so you must be patient when dealing with it, it is best to check each plug - over and over, including the contact of the relevant fuses and the ironing of the grounding wire.
3. ABS control unit (ECU) programming problem
Most likely the data in the control unit does not match or the data is incorrect, readjust the data. This item requires the use of a dedicated testing computer.
4. The problem of the ABS master cylinder.
5. The ABS control unit (ECU) circuit board is faulty, and the computer needs to be replaced. However, the probability of this failure is very small, and some cars and even the circuit board of the ABS control unit can still be repaired simply, such as the falling off of the solder joints.
