The Kia Spectra Vehicle Speed Sensor provides an accurate signal of the road speed to the automatic transmission control module, allowing the computer to time the gear changes and torque converter lockup precisely. On Kia editions built before the mid-2000s, a passive, permanent magnet or reed switch type Vehicle Speed Sensor produced a sine wave as the teeth on the output shaft tone wheel passed the tip of the sensor; cheap but reliable, prone to misbehavior if the wiring corroded, causing the older Spectra to hamper. Later Kia Spectra models applied a more refined active Vehicle Speed Sensor which had internal electronics for squaring and amplifying the signal so that the pulse presented to the PCM was cleaner at very low or very high speeds. Both versions bolt to the transaxle and, as the Vehicle Speed Sensor monitors output shaft rotation, the active type will tolerate wider air gaps and resist electrical noise, resulting in less harsh shifts or loss of upshifts as compared with the passive design. Because the Kia control logic also receives this data and feeds it to cruise control and the odometer, a healthy Vehicle Speed Sensor keeps the entire Spectra lineup driving smoothly.
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