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Home >> Buick >> 1987 >> Electra Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> CCC Theory/Operation >> Operation >> Electronic Control Module (ECM) >> Central Processing Unit (CPU)

Central Processing Unit (CPU)

Digital signals received by the 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 control, closed loop fuel control and the diagnostic system.

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