Indirect tire pressure monitoring system / TPMS

Indirect Tire pressure monitoring system/ TPMSWheel speed sensor signal generation principle :Permanent magnet wheel speed sensors have a certain strength of the magnetic field, when the toothed ring rotates and changes the sensor magnet gap, so that the composition of the magnet and the ring gear corresponding changes in the magnetic circuit reluctance. As a result, the magnetic flux flowing through the magnetic circuit changes periodically, and the speed of change in magnetic flux is proportional to the induced voltage generated in the coil, the output AC voltage signal is connected to one end of a strong host TPMS, tire pressure as an indirect measure purposes.1. Find the signal line :Open the hood, the pump next to the bus in the ABS wheel speed sensors to identify the four signal lines, two for each wheel speed sensor wire is intertwined with each other twisted pair.2. Determine the signal line: