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Suzuki reports fuel economy testing irregularities in Japan but says no need to amend values

Suzuki announcement that it has found “some discrepancies” between the automobile emission and fuel efficiency testing methodology it has used in Japan and the requirements from Japan’s Ministry of Land, Infrastructure, Transport and Tourism (MLIT).

However, the company said, after retesting vehicles, it found that all certified fuel efficiency values remained within the range of measurement deviation. The company said it thus was not necessary adjust the measured values. The announcement came as Suzuki delivered the results of an internal investigation into its emissions and fuel efficiency testing ordered by the MLLIT. The issues do not apply to products sold under the Suzuki badge outside of Japan.

Suzuki reviewed the measuring process of driving resistance of all 16 models currently available for sale in Japan. The company said that instead of using actually measured data from the entire car through the coasting test, the submitted driving resistance data at the time of application for certification was a build-up of measured data of individual components such as tires, brakes and transmission from rolling resistance tests and air resistance tests in the wind tunnel.

Suzuki said that the background to the irregularity lies in the fact that its Sagara proving ground is located atop a hill close to the sea, where it is significantly affected by weather conditions such wind, and carrying out tests was difficult.

Recent improvements in fuel efficiency technologies, accompanied by reduced rolling resistance and vehicle weight, have resulted in a greater tendency for cars to be influenced by wind, and with a wider spread of results, the company argued.

In the course of the investigation, Suzuki said that it measured the actual car data through the coasting test; all certified values remained within the range of measurement deviation.

Regarding emissions, Suzuki said that it complies with the standards.

The models subject to the investigation are:

  • Alto(Launched on 22 December 2014)
  • Alto Lapin(Launched on 3 June 2015)
  • Wagon R(Launched on 19 September 2012)
  • Hustler(Launched on 8 January 2014)
  • Spacia(Launched on 15 March 2013
  • Every(Launched on 18 February 2015)
  • Carry(Launched on 20 September 2013)
  • Jimny(Running change in 2010)
  • Solio(Launched on 26 August 2015)
  • Ignis(Launched on 18 February 2016)
  • Baleno(Launched on 9 March 2016)
  • SX4 S-CROSS(Launched on 19 February 2015)
  • Swift(Launched on 18 September 2010)
  • Escudo 2.4(Running change in 2012)
  • Escudo(Launched on 15 October 2015)
  • Jimny Sierra(Running change in 2010)

Suzuki does not anticipate any impact on forecasts for the consolidated operating results at the moment.

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