Symptom: an era of Superman cars, open the ignition switch, ABS fault lights are often not extinguished.
    Troubleshooting: read the fault code with V.A.G1552, the right front wheel speed signal is bad. After the fault code is removed, the test is carried out on a straight road to observe that the right front wheel speed signal will suddenly lose the speed signal during the acceleration process, but the signal will be recovered soon after the loss of the signal and the fault information has been Recorded, so the ABS fault light is on.
    Lift the car to check the right front wheel speed sensor, the sensor is installed correctly, while reading the right front wheel speed signal dynamic data, acceleration will still appear when the signal loss phenomenon.
    According to the above test situation analysis, the acceleration process, the right front wheel speed signal loss is likely to be subject to external interference, find a replacement from the imported car wire, replace the right front wheel speed sensor to the ABS control unit Of the wire. Eliminate the fault code after the road test, everything back to normal.
    Failure analysis:
    (1) lift the front wheel, test the right front wheel speed signal is normal, indicating that the sensor is no exception.
    (2) on the straight road and lift the wheel, respectively, test the right front wheel speed signal. Dynamic test data show that acceleration will occur when the speed signal loss phenomenon, indicating that the signal is not lost because of poor traffic. After lifting the car, check the right front wheel speed sensor, find the assembly position is correct, indicating that the signal is not lost due to improper installation or excessive wear on the front wheel bearings caused by the right front wheel speed sensor backlash tooth ring correct.
    (3) Accidental loss of the signal during acceleration means that the increased ignition voltage may radiate more electromagnetic waves to the outside, thus affecting the poorly shielded signal.