"Toyota" doesn't hire mechanics; Toyota DEALERS do. Call your local Toyota dealers, ask to speak to their service department managers, and find out what they want...
Just like any other job, if the manager is short-staffed, they'll be less picky on qualifications.
Edit in response to your comment "btw no **** toyota doesn't hire their mechanics": No need to swear. If you already know that Toyota doesn't hire mechanics, then why are you asking "does toyota require a certification"? Dealers will hire anyone that owns a set of tools, regardless of certifications, if the dealer is desperate enough (and if the mechanic will work cheaply enough).
With your attitude you'll make a perfect mechanic.
I don't know why I bothered, but here's a Toyota dealer that is hiring certified mechanics, but *Toyota* certification and experience is not required:
http://hamertoyota.com/Employment.aspx
You're welcome.