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Home >> GMC >> 2002 >> Safari Van 2WD V6-4.3L VIN X >> Repair and Diagnosis >> Powertrain Management >> Relays and Modules - Powertrain Management >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Description and Operation >> Primary System Based Diagnostics
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Primary System Based Diagnostics

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