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Home >> GMC >> 1984 >> Magnavan 5.7 L, 475/M40 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> CCC Theory/Operation >> Operation >> Electronic Control Module (ECM) Operation >> Central Processing Unit (CPU)
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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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