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Home >> Cadillac >> 1987 >> Seville >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> DFI System Theory/Operation >> Operation >> Electronic Control Module (ECM) Operation >> Central Processing Unit (CPU)

Central Processing Unit (CPU)

Digital signals received by CPU are used to perform all mathematical computations and logic functions necessary to deliver proper air/fuel mixture. The CPU also calculates spark timing and idle speed information. The CPU commands operation of emission controls, closed loop fuel control, cruise control and diagnostic system.

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