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Home >> Pontiac >> 2001 >> Aztek Base, FWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls (Gasoline Engines) >> Input Devices >> Digital Ratio Adapter Controller
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Digital Ratio Adapter Controller

The Digital Ratio Adapter Controller (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 and speedometer. On models equipped with a DRAC, VSS buffer is an internal part of DRAC.

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