An investigation has opened in the US into whether Toyota acted quickly enough to recall cars that demonstrated accelerator problems.
Officials have requested all production data and consumer complaints to discover how and when Toyota found out about the problem affecting around six million vehicles recalled in the United States.
As many as 34 people have died as a result of the unintended acceleration.
The probe is to determine if the car giant violated its legal obligations and sets the stage for a congressional review next week.
Meanwhile, Toyota says it is to shut down two of its assembly plants in Kentucky and Texas for at least 11 days.
Furthermore, Toyota says it will establish a global quality-control task force headed by company president Akio Toyoda, to spell out what steps the company is taking to address design flaws that led to a recall of 8.5 million vehicles.