The Nissan Maxima Vehicle Speed Sensor constantly measures the vehicle's road speed so the car's computer can time fuel delivery, shifting, and safety features accurately. The Vehicle Speed Sensor generates an electrical signal by converting the rotation of a toothed tone wheel. In turn, this real time signal assists the engine and ABS modules in optimizing throttle response and braking for a smoother drive and safer stops. The original Vehicle Speed Sensor in the early Maxima models, which was passive in nature, manufactured a sinusoidal signal whenever the ring teeth swept past an attached magnet and coil. The system worked well but became less effective at low speeds. Subsequent Nissan models incorporated an active Vehicle Speed Sensor that features a built-in signal conditioner, either with Hall effect or magnetoresistive characteristics, and is capable of reading a wider air gap and outputting a clearer signal over its full speed range. The modern Nissan models still retain the same mounting point near the transaxle. Also, every Maxima still depends on its fifth and final Vehicle Speed Sensor to keep electronic systems in sync.
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