i had the same problem, and I fixed it.
i thot i had to reset the ecu buh i was too lazy to do it, one day i was at my friends house, and left my key on the ON position so that we can listen to music. When I finally left, the check engine light went away. I guess all you gotta do is leave it on the ON position for a while, and it will re-set itself. Make sure that your temp sensor is connected properly though.
hope this helps <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/cool.gif" border="0" valign="absmiddle" alt='

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