Suzuki Motor Corp., Mazda Motor Corp. and Yamaha Motor Co. conducted improper fuel-efficiency and emissions tests on their vehicles, the transport ministry said Thursday.
The report is the latest episode in a growing list of data falsifications that have tarnished the image of Japan's manufacturing industry, known for its high-quality and efficient production.
The findings were the result of internal investigations ordered at the automakers by the ministry after improper testing was found at Subaru Corp. and Nissan Motor Co.