The shutdown as of Tuesday comes a week after Daihatsu Motor Co. announced it was suspending all vehicle shipments in and outside Japan after finding improper testing involving 64 models. That led transport ministry officials to launch a deeper probe into problems that apparently persisted for decades.
Toyota Motor Corp.'s Daihatsu unit shut down production lines at its four factories in Japan over improper safety tests in over 64 models and three vehicle engines, including 22 models and an engine sold by Toyota.