No it does not. Unless you have opened the emergency ram air inlet in which case there will be no pressurisation.
KBPsen,
you're right. Was so convinced as if pack inlet and outlet valves did actually allow ram air to freely enter, that finally wrote a nonsense.
But definitely don't take this as I did not really know what I was talking about, I simply made a mistake.
Bio,
thought back to what I wrote and just got to be in the wrong. Please excuse me!
Best,
fredgrav