The three automakers admitted conducting improper inspections after the ministry ordered 23 Japanese auto and motorbike manufacturers to examine their inspection procedures in July after similar falsifications were found at Nissan Motor Co. and Subaru Corp.in their fuel economy data at final product quality checks.
All three have already complied with a request by the Japanese Ministry of Land, Infrastructure, Transport and Tourism (MLIT) to conduct investigations into the matter. But a growing list of improprieties has tarnished the image of the country's manufacturing industry for high-quality products and efficiency.
Reuters, meanwhile, reported that Suzuki most often inspected vehicles with manipulated emissions data, adding that the company confirmed that nearly half of its 12,819 new auto inspections were improper dating back to 2012.More news: Hamas militants killed by Israeli artillery fire in Gaza
Suzuki admitted improper inspections on 6,401 vehicles, or almost half of those subject to sample checking, between 2012 and 2018.
Suzuki Motor CEO Toshihiro Suzuki (2nd R) bows with other executives during a news conference in Tokyo, Japan August 9, 2018.
Suzuki, Japan's fourth-largest automaker, said that of 12,819 sample vehicles tested for fuel economy and emissions since June 2012, around 50 percent of them had been inspected improperly. Officials at Suzuki said insufficient training and the absence of supervision by senior workers led to the lax inspections. In Yamaha's case, irregularities were found in 2 percent of inspections, or just a handful of vehicles. According to a report by the Nikkei Asian Review, Mazda, Suzuki and Yamaha are now caught up in the scandal as well. Yamaha Motor confirmed it carried out inappropriate testing.More news: Oscars Adds Popular Film Category, Will Edit Shows to 3 Hours
The ministry made the results public based on reports from 20 automakers collected as of Wednesday.
The transport ministry said it would "examine their reports and take strict measures if necessary".
The quality-control data falsifications have embroiled Kobe Steel Ltd. and Mitsubishi Materials Corp.More news: Roku's free streaming service is on the web now