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Home >> Pontiac >> 2000 >> Bonneville V6-3.8L SC VIN 1 >> 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

The scan tool range is 0.0 to 25.5. The air/fuel ratio indicates the PCM commanded value. In closed loop, the 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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