Solution: Check the wiring and eliminate the grounding fault. Abs sensor is an abs (Anti-lock Brake System) applied to motor vehicles. In ABS system, the vehicle speed is mainly monitored by inductive sensors. ABS sensor outputs a set of quasi-sinusoidal AC electrical signals whose frequency and amplitude are related to the wheel speed by interacting with the gear ring that rotates synchronously with the wheel. The output signal is transmitted to ABS electronic control unit (ECU) to realize real-time monitoring of wheel speed.