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2003
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Silverado 1500 HD, RWD
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Repair and Diagnosis
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Engine Performance
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Testing & Diagnosis
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ENGINE CONTROLS - SELF-DIAGNOSTICS - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline
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Diagnostic Tests
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DTC P0446: EVAP Vent Control Circuit
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Diagnostic Procedure
Diagnostic Procedure
Fig 1: DTC P0446: EVAP Vent Control Circuit (Steps 1-6)
Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC P0446: EVAP Vent Control Circuit (Steps 7-14)
Courtesy of GENERAL MOTORS CORP.
Courtesy of GENERAL MOTORS CORP.
Courtesy of GENERAL MOTORS CORP.