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Not certain about this but evap system logic would suggest the purge valve is normally closed until the evap control system (ECM) commands a purge of the canister. It is supposed to be closed when refueling, which is presumed to be with the ignition at Off, if the key isn't also out. The KOEO scenario could be different, for example, to enable the OBD to test for a shorted or open connection to the solenoid, but I tend to doubt this, for the same reason as it's closed during refueling -- prevent fumes from entering the manifold where they can accumulate and upset the air/fuel balance when the engine is started.

Are you having a problem that would point to the purge valve being in the wrong state?
 

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No, I was trying to diagnose the valve. It had failed in the open position. When I removed it and put vacuum to the input, it just passed thru. New valve solved the problem.
 
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