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The vehicle's speed sensor, which is mounted on the output shaft of the transmission (some later models with mechanical speedometers have the speed sensor mounted behind the speedometer) sends electrical pulses to the computer, pulses which are generated through a magnet that spin a sensor coil. When the vehicle's speed increases, the frequency of the pulses also increases. Note that for any given speed of the vehicle, there is a corresponding pulse frequency. It is this pulse frequency which the cruise control tries to maintain as a constant. Speed sensors are usually made up of a toothed metal disk mounted on a rotating shaft and a stationary detector covering a magnetic coil.If the vehicle speed sensor fails, the cruise control system will not get a speed signal. If this is the case, most probably, the speedometer will usually stop working as well.

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Q: What does a speed sensor do on a 1994 mercury villager?
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