Matthew Schwall, Toyota's managing engineer of Exponent's vehicle engineering, performs a pedal test on a BMW during a live Webcast on Monday at Toyota Headquarters in Torrance, California. Toyota, dogged by millions of recalls and claims that it still has not fixed its safety problems, assembled a group of experts who said studies by an Illinois professor who revved Toyota engines simply by short-circuiting the wiring were flawed because they created conditions that would never happen on the road.