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Home >> GMC Truck >> 1999 >> S15/T15 Sonoma P/U 2WD L4-2.2L VIN 4 >> 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 >> Engine Scan Tool Data Definitions - 1 >> Lean/Rich Avg.

Lean/Rich Avg.

Range - 0-249 mS counts
The PCM takes the Lean/Rich transition times following the completion of the data collection period as specified in the Conditions for Setting in DTC P0133 and DTC P1133. Then the PCM averages the transition time from the total transition times.
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