The Lexus ES300 Speed Sensor helps the car's computers know just how fast it and its wheels are going, helping to maintain correct engine and brake control. Mounted near a ferromagnetic toothed tone wheel, the Speed Sensor measures variations in the magnetic field as the ring rotates, then transforms the data from those pulses into speed data, which the control modules can interpret in real time. Early models of ES300 were based on passive units of Speed Sensor that produced a simple sinusoidal signal created only by the magnetic interference of the rotating teeth, sufficient for simple speedometer and transmission applications. As Lexus refined the sedan, active designs emerged in later editions of the ES300, which, in addition to cleaning the waveform, provided multiple output styles, allowing the anti-lock braking system to provide faster and clearer feedback. Both versions have the same basic objective, but the active Speed Sensor version tolerates larger air gaps, resists electrical noise, and maintains accuracy even at very low wheel speeds. Complementary Hall-effect and magnetoresistive technologies also appeared throughout the years, each increasing the precision under harsh road conditions. Regardless of style, every Speed Sensor on a Lexus ES300 feeds critical information that is applied by the engine computer, the traction control, and the ABS modules to balance power, improve stopping distances, and keep driving smooth and safe for owners of this Lexus favorite.
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