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Home >> Chevrolet >> 1990 >> Hi-Cube 5.7 K, 475/M40 >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Electronic Control Module (ECM) Description >> Central Processing Unit (CPU)
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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. CPU also calculates spark timing and idle speed. The CPU commands operation of emission control, "closed loop" fuel control and diagnostic system.

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