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Home >> Buick >> 2000 >> Century V6-3.1L VIN J >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Scan Tool Testing and Procedures >> Scan Tool Data, Normal Values and Definitions >> Scan Tool Data Definitions - Powertrain Systems >> Air/fuel Ratio
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Air/fuel Ratio

Scan Tool Displays 0.0-25.5 Air/Fuel Ratio indicates the PCM commanded value. In closed loop, Air/Fuel Ratio should normally be around 14.2-14.7. A lower Air/Fuel Ratio indicates a richer commanded mixture, which may be seen during Power Enrichment or TWC Protection modes. A higher Air/Fuel Ratio indicates a leaner commanded mixture. This can be seen during Decel Fuel Mode.
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