2004 Suzuki Forenza Question: vacuum hose off top of auto trans

I have a 04 forenza with the CEL on. While the diagnostic shows a vacuum leak, I searched for about 2 hrs and found a vacuum hose coming off the top of the auto trans, that leads toward the firewall. I cannot find where the other end goes to! There is no connection I can find for it. Any help? Thank you in advance, Jon