The Acura MDX Speed Sensor gives the onboard computer precise data on drivetrain or wheel rotation, letting the system deliver crisp shifts and confident braking. Mounted on the transmission output shaft, the Speed Sensor, known as the VSS, sends signals to the PCM or TCM so it can set hydraulic pressure, choose shift points, and lock or unlock the torque converter clutch at just the right moment, an essential function on every Acura crossover since the first MDX appeared. Later MDX models add wheel Speed Sensor units that report each wheel's speed to the ABS to keep traction and stability in check. Two key designs have served Acura drivers, a passive magnetic Speed Sensor that creates a sinusoidal signal as a toothed tone ring passes its magnet, and a newer active Hall Effect style with onboard electronics that produces a crisp digital waveform and tolerates wider air gaps. Both Speed Sensor styles measure rotation accurately, yet the active type shrugs off electrical noise and meets the advanced software demands found in modern Acura MDX vehicles.
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