The truck's control modules receive the Frontier's road speed in real time from the Vehicle Speed Sensor. This enables precise mapping of fuel delivery, shifting of transmission, and responses to safety sensors. In the past, it has worked with passive Vehicle Speed Sensors. These sensors have a magnetic pickup. This pickup is aimed at a toothed tone ring. Moving teeth end up warping a magnetic field. The Vehicle Speed Sensor then generates an analog sine wave. It then sends this sine wave to the computer. Later trucks have an active Vehicle Speed Sensor. This sensor retains the tone ring but adds internal electronics. It produces a crisp digital pulse and is still readable at very low wheel speeds. The two versions rotate the same way, but the active style can manage larger air gaps, resist signal noise, and support ABS and other systems more reliably. Fastened to the transmission or differential of a Nissan Frontier, the Vehicle Speed Sensor counts revolutions of the ring to ensure speed readings match the action occurring in the drivetrain. Should the signal from the Vehicle Speed Sensor drop out, the speedometer quits, and cruise or stability aids on a Nissan misbehave, revealing the compact unit's importance for every Nissan Frontier.
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