How to Determine the Condition of the Three Wires in a Vehicle Speed Sensor?

[VanAmara]

Judgment method is as follows: 1. Remove the vehicle speed sensor connector, and use the resistance range of a multimeter to check the resistance value between the two leads of the sensor. 2. Rotate the transmission output shaft, and use an automotive oscilloscope to detect the signal voltage waveform between the two leads of the vehicle speed sensor. If the waveform is in the form of alternating current, and both the amplitude and frequency of the waveform increase as the output shaft speed increases, this indicates that the sensor is in good condition. Principle of the mileage sensor: The sensor, located on the differential or half-shaft, senses the number of rotations of the tire. Since the angular velocity of the half-shaft and the wheel is equal, and the radius of the tire is known, the driving mileage can be directly calculated through the mileage parameter.