P0449 on 2002 venture

2002 CHEVROLET VENTURE
150,000 MILES
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BOFOLTON2
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Can't get rid of code P0449 is immortal, canister valve besides charcoal canister replaced, purge valve and hoses in engine compartment replaced, good ground good voltage on both ,no shorts ., code was erased and reappear again and again no symptoms at all just check engine light on, even the gas cap was replaced, no clogged lines, electrical plugs cleaned no leaks, . any suggestion?
Apr 3, 2016 at 9:55 AM
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HMAC300
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follow steps in pic to diagnose whether it is grounded/shorted circuit
Apr 3, 2016 at 12:45 PM