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Home >> GMC >> 1996 >> Yukon 4D Utility, RWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation - Gasoline >> Computerized Engine Controls >> Input Devices >> Vehicle Speed Sensor (VSS)
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Vehicle Speed Sensor (VSS)

VSS is a Permanent Magnet (PM) generator mounted in transmission or transfer case. The VSS sends a pulsing signal to the PCM/VCM or Digital Ratio Adapter Controller (DRAC), which passes the signal on to the PCM/VCM. PCM/VCM then converts this signal into Miles Per Hour (MPH) by monitoring the time interval between pulses. PCM/VCM uses this sensor input in controlling converter clutch engagement, shift speed, etc.

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