After Mitsubishi, another Japanese car manufacturer has admitted it has been using improper fuel economy testing methods.

While the scandal at Mitsubishi Motors is slowly winding down, it seems another one is ready to make the headlines. Suzuki Motors officials have revealed just a few hours ago the company has been using non-compliant fuel economy testing methods. Spokesman Hidehiro Hirano announced this morning the company’s chairman, Osamu Suzuki, will report this problem later today to Japan’s Ministry of Land, Infrastructure, Transport and Tourism (MLIT).

Suzuki states the issue concerns 16 models sold only in its domestic market and all these cars were tested using methods different than the ones specified by the Japanese regulations. It’s important to mention that Japan’s fourth-largest car manufacturer points out that it has not deliberately manipulated the test results.

After analyzing the measuring process of driving resistance of all 16 models, Suzuki discovered the problem. Instead of submitting the measured data of the car through the coasting test, it provided a build-up of measured data obtained from individual components during rolling resistance tests and air resistance tests in the wind tunnel.

Suzuki continued the investigation and compared the two sets of results that showed “all certified values remained within the range of measurement deviation.” The company does admit there is a discrepancy between the values, but believes it's small and it should not pose a significant problem. Suzuki mentions part of the issue is the location of its Sagara proving ground, at the top of a hill, near the sea. Weather conditions - especially wind - have an impact on the results of the tests.

These are the 16 models which are subject to investigation:

  • Alto
  • Alto Lapin
  • Wagon R
  • Hustler
  • Spacia
  • Every
  • Carry
  • Jimny
  • Solio
  • Ignis
  • Baleno
  • Swift
  • Escudo 2.4
  • Escudo
  • Jimny Sierra

Shortly after the news emerged, Suzuki’s shares tumbled by 11 percent during the afternoon trade in Japan. It could have been a lot worse, as at one point during the day value dropped by 15 percent.

Source: Suzuki

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