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Home >> GMC >> 1986 >> Jimmy 6.2 C >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> CCC Theory/Operation - Except "S" Series >> Operation >> Electronic Control Module (ECM) Operation >> Programmable Read Only Memory (PROM)

Programmable Read Only Memory (PROM)

This memory is factory programmed information, including engine calibration data, transmission, vehicle weight, and rear axle ratio application. The PROM can be removed from the ECM. If battery voltage is removed, PROM information will be retained.

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