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Home >> Chevrolet >> 1999 >> S10/T10 P/U 2WD L4-2.2L VIN 4 >> Repair and Diagnosis >> Relays and Modules >> 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 below with a brief description of the diagnostic functionality.
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