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Home >> Oldsmobile >> 1997 >> Silhouette Base, Van Passenger Extended >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Control System - Theory & Operation >> Computerized Engine Controls >> Input Devices >> Digital Ratio Adapter Controller (DRAC)
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Digital Ratio Adapter Controller (DRAC)

DRAC compensates for various axle and tire ratios by monitoring the Vehicle Speed Sensor (VSS) signal and modifying it before passing it on to the PCM/VCM and speedometer. On models equipped with a DRAC, VSS buffer is an internal part of DRAC.

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