Orlando City (7-11-1) won for the first time since beating Real Salt Lake 3-1 on May 6. Orlando City's skid was tied for the third-longest in MLS history. The New York Red Bulls lost 12 in a row in 1999 and Real Salt Lake lost 10 straight in 2005.
Schuler, a 30-year-old defender, headed home the rebound of a long-range shot by Dom Dwyer from point-blank range in the 34th minute.
Dwyer doubled the advantage in the 48th when he blasted a left-footer from the top of the arc past the outstretched arms of a diving Alexander Bono.
Earl Edwards Jr., making his second career appearance, had three saves in his first MLS win.
Nick Hagglund scored in the fourth minute of stoppage time for Toronto (4-11-4), which is winless - with four losses - in its last six matches.
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