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Mazda, Suzuki, Yamaha Motor conducted improper fuel, emissions tests

Japanese carmakers Mazda Motor Corp. and Suzuki Motor Corp., as well as motorcycle manufacturer Yamaha Motor Co. Ltd., were found to have carried out improper fuel and emissions tests on their vehicles, Reuters reported Aug. 9, citing Japan's transport ministry.

The findings are part of the results of an internal investigation at Japanese vehicle makers, which was ordered by the Ministry of Land, Infrastructure, Transport and Tourism after improper testing was discovered at Nissan Motor Co. Ltd. and Subaru Corp. earlier this year.

Subaru in April said that certain employees altered data with respect to fuel economy and emissions standards to reduce variance in measurement values to avoid any questions from group and section chiefs. Subaru added that the alterations were not just made to improve results but also to worsen them.

In July, Nissan said it found misconduct in relation to exhaust gas measurements during final vehicle inspections at several of its factories in Japan. Nissan discovered that the performance of exhaust emissions and fuel economy tests at several domestic plants "deviated from the prescribed testing environment," and that the creation of inspection reports was based on "altered measurement values."

Reuters said representatives of Mazda and Suzuki confirmed they sent the ministry reports on improper testing but did not provide further comment. Meanwhile, a Yamaha Motor spokesperson confirmed to the news wire that there were "improper actions" regarding the emissions inspections.