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Home >> Saturn >> 2000 >> LW1 Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Control System - Theory & Operation >> Computerized Engine Controls >> Powertrain Control Module >> Central Processing Unit

Central Processing Unit

Digital signals received by the Central Processing Unit (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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