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Home >> Chevrolet >> 2004 >> Optra Base, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - 1.8L (L79) - Description And Operation >> Description and Operation >> Engine Control Module Description (European and North American Emissions) >> Primary System-Based Diagnostics

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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