How to Test the Quality of a Two-Wire ABS Sensor?

[DiJayce]

You can use a multimeter to test the ABS sensor. First, disconnect the ABS ECU wiring socket or unplug the wheel speed sensor's wiring connector. Then, rotate the tested wheel at a low speed and use the multimeter's mV range to measure the voltage between the corresponding terminals of each wheel speed sensor. Under normal conditions, the multimeter reading should be above 70mV. Here are detailed explanations about the ABS sensor: 1. The ABS sensor is used in a vehicle's ABS system to monitor the speed. It works with a toothed ring that rotates synchronously with the wheel, generating a set of quasi-sinusoidal AC signals whose frequency and amplitude are related to the wheel speed. This output signal is transmitted to the ABS electronic control unit (ECU), enabling real-time monitoring of the wheel speed. The quality of the ABS sensor determines the sensitivity of the ABS system, which is crucial for driving safety. 2. Both the pump and the sensor are components of the ABS system and serve the ABS. Individually, they have no function. The working principle of a vehicle's Anti-lock Braking System (ABS) is as follows: It relies on highly sensitive wheel speed sensors installed on each wheel and a vehicle speed sensor on the body, controlled by a computer. During emergency braking, if any wheel is detected to be locked, the computer immediately instructs the pressure regulator to release (reduce) pressure in the wheel's brake cylinder, allowing the wheel to resume rotation.