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Home >> GMC >> 1993 >> Yukon Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls (Gasoline) >> Electronic Control Module (ECM) >> Read Only Memory (ROM)
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Read Only Memory (ROM)

ROM is programmed information which only ECM can read. The ROM program cannot be changed. If battery voltage is removed, ROM information is retained.

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