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2003
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Impala LS
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Repair and Diagnosis
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Engine Control System Self-Diagnostics - 3.8L
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Diagnostic Tests
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DTC P0446: EVAP Vent System Performance
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Diagnostic Procedures
Diagnostic Procedures
Fig 1: DTC P0446: Evaporative Emissions Vent System Performance (Steps 1-5)
Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC P0446: Evaporative Emissions Vent System Performance (Steps 6-14)
Courtesy of GENERAL MOTORS CORP.