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My guess would be pin it to a switched power source in the engine bay if open loop = powered buzzing freq valve. Otherwise pin it to a ground. Simple voltage measurement at the valve while running open loop would tell you which way to go. I do not have my wiring diagrams here at work...
-Michael
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 Michael
'82 Euro SC 'Track Rat' 22/29 Hollows, 22/22 Tarrets, Full ERPB F/R, Rennline Tri Brace, Glass bumpers, Pro 2000's, 5 pts, blah blah blah
'13 Cayenne GTS
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