The Nissan Xterra Vehicle Speed Sensor measures the pace at which this sport utility vehicle moves and feeds that information to on-board computers that help the vehicle respond, its transmission shift and its safety function (ABS braking). In the early years, the Vehicle Speed Sensor produced an alternating voltage from a simple passive magnetic pickup reading teeth on a reluctor ring as each tooth passed. The later Nissan Xterra models have a Vehicle Speed Sensor that is an active often with a Hall effect element that produces a clean digital pulse at all speeds. Both variants employ a tone wheel mounted on the output shaft of the transmission. However, the active variant can tolerate wider air gaps and is more robust against electrical noise. This enhances reliability but does not alter the basic installation. When the Vehicle Speed Sensor sends the correct signals, control modules will adjust to ensure the right amount of fuel gets delivered, automatic gears change smoothly and wheels won't lock during hard stops, giving the driver smoother performance through all driving situations. A malfunctioning Nissan Vehicle Speed Sensor may cause jumpy speedometer readings, harsh shifts or illuminated warning lamps, so knowing what this component does can help Xterra owners deal with problems before they worsen.
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