Mazda, Suzuki and Yamaha admit conducting improper emissions tests

Suzuki Mazda Yamaha admit to using falsified emissions data

Suzuki Mazda Yamaha admit to using falsified emissions data

Japan's Mazda, Suzuki and Yamaha have admitted to conducting improper fuel economy and emissions tests on their vehicles in Japan, in revelations which pile further misery on Japan's beleaguered manufacturing sector.

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.

Representatives for Mazda and Suzuki confirmed they submitted reports regarding improper testing to the ministry but declined further comment. The ministry looked at tests done for different periods at the three automakers, stretching back to 2012 in Suzuki's case.

In July, Nissan admitted data on exhaust emissions and fuel economy had been "altered" for some of its vehicles, and previous year the firm was forced to recall more than a million vehicles after admitting staff without proper authorisation had carried out some inspections.

The companies admitted incomplete emissions tests were done on some of its vehicles, but their officials certified the results as though the tests had been administered fully.

"I deeply apologize and will lead efforts to prevent recurrence", Chief Executive Toshihiro Suzuki told a news conference.

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At Mazda, of 1,875 cars subject to the sampling inspection, improper inspections were discovered in almost 4 percent since November 2014.

Suzuki, Mazda and Yamaha said they would take preventive steps, such as changing inspection devices so their staff can not rewrite the data. The transport ministry will change its ministerial ordinance to request automakers save test results of manufactured vehicles and take measures to prevent adjustment of results.

Suzuki tumbled 6.04 percent to 6,944 yen, Mazda sank 1.30 percent to 1,327 yen and Yamaha Motor dived 4.63 percent to 2,820 yen.

"It is extremely regrettable that this situation makes users anxious over the quality of vehicles and the quality control operations of carmakers", said Transport Minister Keiichi Ishii.

Kobe Steel, Mitsubishi Materials Corp and Toray Industries - all key suppliers of motor parts to global manufacturers - admitted to product data fabrication previous year.

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