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Home >> GMC >> 1993 >> Magnavan 6.2 J >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls (Diesel) >> Electronic Control Module (ECM) >> Programmable Read Only Memory (PROM)
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Programmable Read Only Memory (PROM)

PROM is factory programmed engine calibration data which "tailors" ECM for specific transmission, engine, emission, vehicle weight and rear axle ratio application. PROM can be removed from ECM. If battery voltage is removed, PROM information is retained.

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