The US government says a 10-month investigation has concluded that no electronic control problems caused unwanted acceleration in Toyota vehicles.
Transportation Secretary Ray LaHood released the results of the investigation on Tuesday.
LaHood said in a statement they had the best safety people do a thorough investigation. He said the verdict is in; there is no electronic-based cause for unintended acceleration in Toyotas.
The department says the only causes of runaway vehicles manufactured by Toyota Motor were two mechanical problems. Toyota has argued all along that the problem was caused by sticky gas pedals and loose floor mats.
The US space agency, NASA, helped find the cause of the problem by subjecting Toyota's electronic systems to a variety of conditions to see if the problem could be recreated. The results have effectively spurned the lingering skepticism about Toyota's electronic throttle.
The sudden acceleration problem led to a recall of about 8 million Toyota vehicles from 2009 to 2010 and a sharp drop in sales.
Toyota's chief quality officer for North America, Steve St Angelo, says the company believes this rigorous scientific analysis by some of America's foremost engineers should reinforce confidence in Toyota and Lexus vehicles. He says the company hopes this study will help put to rest unsupported