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Dongfeng Citroen Elysee sedan with a mileage of about 50 thousand km. Owners reflect: the ABS system fault lights suddenly lit up. When the test is run, the brake pedal is pressed. The ABS system does not work. The owner was asked to know that the ABS system had been repaired in a service station and changed two times before the left front wheel speed sensor. After each replacement, the ABS system could work normally, but after a few days, the ABS fault lights were bright and the ABS system failed when stepping on the brake. Fault diagnosis: (1) the special diagnostic instrument PROXIA is connected with the 16 channel diagnosis interface of the vehicle to read the ABS system fault code, and the diagnosis fault shows that the left front wheel speed signal No. 1 is not received. Second, carry out road test and start using the special diagnostic instrument PROXIA to measure the parameters of the ABS system, and the left front wheel speed is displayed. Km/ho, pull out the left front wheel speed sensor and measure the sensor with multimeter. The resistance is infinite. It is clear that the sensor is damaged due to a breakdown of the circuit. But the car has replaced two left front wheel speed sensors and checked the Elysee ABS system circuit diagram. Analysis shows that the real cause of the fault may be the damage of the sensor line and the ABS control unit. Remove the plug of the ABS control unit. The left front wheel speed sensor line is detected and the result is normal. There is no short circuit or open circuit to eliminate the damage caused by the line. Through the above diagnosis, the cause of the fault has been basically identified: ABS, the system control unit is damaged, causing frequent burning of the left front wheel speed sensor. The test run is normal after changing the control unit and the left front wheel speed sensor. In order to further determine the real cause of the fault, three days of test, ABS system is still normal work, the owner of the car after the use of half a month, return to the owner, everything is normal. According to this, the fault reason is that the fault of the ABS system control unit causes the damage of the left front wheel speed sensor, so the system failure light is lighted and the system can not work properly.