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Home >> GMC >> 1993 >> Yukon Standard >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls (Gasoline) >> Electronic Control Module (ECM) >> Central Processing Unit (CPU)
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Central Processing Unit (CPU)

CPU uses digital signals 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 controls operation of emission control, "closed loop" fuel control and diagnostic system.

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