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Home >> Chevrolet >> 2005 >> Optra Base, 4D Sedan, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 2.0L (L34 GMDAT) - Introduction And Mechanical Repairs >> Description and Operation >> Engine Control Module (ECM) Description >> Primary System-Based Diagnostics
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Primary System-Based Diagnostics

There are primary system based diagnostics which evaluate system operation and its effect on vehicle emissions. The primary system-based diagnostics are listed below with a brief description of the diagnostic function.

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