The ABS Sensor on the Nissan Sentra tracks wheel rotation. This helps the anti-lock brake system control hydraulic pressure and prevent the wheels from locking up. The ABS Sensor detects changes in the magnetic field by being placed next to a toothed ring which is either on the wheel hub or the axle shaft or the differential ring gear. The ring's rotation produces a changing magnetic field and the ABS Sensor converts it into a voltage signal for the control module in the system. The ABS Sensor functions as the main input which enables the system to compare wheel speeds and decrease pressure on the rapidly decelerating wheel for retaining traction and steering control. The system uses a Hall effect device or a toothed ring with an electromagnetic coil. Within a limited speed range, reliable feedback signal generation occurs. However, underly speeds, signal accuracy can be affected or ignored. An illuminated ABS warning lamp indicates the system has disabled itself following a fault in the Nissan Sentra ABS Sensor circuit, but normal hydraulic braking typically remains available until the fault is repaired on the Nissan Sentra. The ABS system of a Nissan Sentra needs reliable data from the ABS Sensor.
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