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Home >> Subaru >> 1999 >> Legacy Outback, 2.5, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Input Devices >> Vehicle Speed Sensor (VSS)
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Vehicle Speed Sensor (VSS)

PCM supplies voltage to one side of a reed switch located in speedometer. Speedometer cable revolution opens and closes reed switch, providing PCM with continuity/no continuity input. PCM interprets this signal as vehicle speed.