The Nissan Altima Vehicle Speed Sensor supplies accurate information on the speed of the vehicle to the vehicle's computer. This ensures smooth functioning of the engine and stability of braking. The sedan's Vehicle Speed Sensor monitors how fast you are going by reading a toothed tone wheel, which it then feeds to control modules to time fuel delivery and coordinate anti-lock braking. In the early years of production, a passive Vehicle Speed Sensor was applied, which operated on the principle that the magnet generates a current in the coil whenever the spinning teeth move in or out of the magnetic field. It provides a sinusoidal signal. Thus, it was a very simple arrangement, but it tends to weaken at crawling speeds. As its onboard electronics got more sophisticated, Nissan updated the Altima with an active Vehicle Speed Sensor. This adds built-in circuitry that conditions the signal into crisp digital pulses, raises resolution, and tolerates larger gaps between sensor and ring. The active version provides better traction control and support for many current features, despite both having similar mounting points. Ongoing improvements ensure that Nissan drivers experience responsive acceleration, and every Altima benefits from the consistent readings of vehicle speed courtesy of the Vehicle Speed Sensor.
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