Currently reading: Mazda, Suzuki and Yamaha improperly tested fuel economy and emissions

The discovery of Nissan and Subaru’s improper testing last year led to the Japanese government ordering checks, which have now implicated Mazda, Suzuki and Yamaha

Several manufacturers in Japan have been found to have improperly tested cars for emissions and fuel economy in an investigation ordered by the Japanese government after the discovery of Nissan and Subaru's emissions testing impropriety last year. 

Suzuki, Mazda and Yamaha are implicated, although with different levels of severity. 

Mazda released a statement explaining that “Test data containing speed trace errors was found in 72 cases out of 1472 vehicles tested under the JC08 mode.”

The company’s emissions testing system “was not set up to automatically invalidate results when a speed trace error occurred,” it explained, while the level of deviation permitted under the test was at the discretion of each individual inspector. 

As a result, there is no false data in any of Mazda’s test data from either test mode. The company has dealt with the findings by updating its testing system to invalidate test results if a speed trace error is detected, as well as increasing the number of workers checking the data.

Suzuki UK is awaiting a statement from the company's headquarters in Japan, but Reuters reports that Suzuki admitted to around 6400 cars being improperly inspected, stretching back as far as June 2012. 

“I deeply apologise and will lead efforts to prevent recurrence,” said Suzuki boss Toshihiro Suzuki. No recalls are planned, however, as Suzuki says that no significant problems were found. 

Yamaha is also implicated, but only 2% of inspections on the brand's motorbikes were carried out improperly. 

Autocar is awaiting further comment from Suzuki and Yamaha.

Read more:

Nissan admits misconduct in emissions testing procedure

Yamaha sports car revealed at Tokyo motor show

London and Paris announce real-world emissions testing for cars

New WLTP emissions test: when it's in force and how it could affect your car

Join our WhatsApp community and be the first to read about the latest news and reviews wowing the car world. Our community is the best, easiest and most direct place to tap into the minds of Autocar, and if you join you’ll also be treated to unique WhatsApp content. You can leave at any time after joining - check our full privacy policy here.

Join the debate

Comments
7
Add a comment…
mpls 9 August 2018

"Many of the "errors" were

"Many of the "errors" were simply paperwork issues, and not actual cheats like VW did with diesel emissions. Sometimes the numbers reported were worse than actual. And all of it was related to domestic market requirements only. None of them had any impact on the exported models. "

overblown by the british media.. nothing on level  or scale of what  VW did..

 

 

FMS 9 August 2018

mpls wrote:

mpls wrote:

"Many of the "errors" were simply paperwork issues, and not actual cheats like VW did with diesel emissions. Sometimes the numbers reported were worse than actual. And all of it was related to domestic market requirements only. None of them had any impact on the exported models. "

overblown by the british media.. nothing on level  or scale of what  VW did..

 

There is simply no link between the two situations, so they must be viewed in isolation. What would your view have been , if there had been no VW "dieselgate"...see my point. If the heads of these companies apologise, even for inadvertant wrongdoing, then we should accept that wrong was done, they will remedy the situation and we all move on...tomorrows metaphoric fish'n'chips wrapping.

 

 

catnip 10 August 2018

FMS wrote:

FMS wrote:

 

There is simply no link between the two situations, so they must be viewed in isolation. What would your view have been , if there had been no VW "dieselgate"...see my point. If the heads of these companies apologise, even for inadvertant wrongdoing, then we should accept that wrong was done, they will remedy the situation and we all move on...tomorrows metaphoric fish'n'chips wrapping.

And also it would appear that the three Japanese companies are not going to spend 6 months lying and staunchly denying it has ever happened, only admitting the truth when threatened with not being permitted to sell their cars in certain markets. A totally different scenario.

 

[/quote]

catnip 10 August 2018

FMS wrote:

FMS wrote:

There is simply no link between the two situations, so they must be viewed in isolation. What would your view have been , if there had been no VW "dieselgate"...see my point. If the heads of these companies apologise, even for inadvertant wrongdoing, then we should accept that wrong was done, they will remedy the situation and we all move on...tomorrows metaphoric fish'n'chips wrapping.

 

 

[/quote]

And also it would appear that the three Japanese companies are not going to spend 6 months lying and staunchly denying it has ever happened, only admitting the truth when threatened with not being permitted to sell their cars in certain markets. A totally different scenario.

coolboy 9 August 2018

always a better nice

 The japanese are on a roll.

russ13b 9 August 2018

this isn't dieselgate

it reads more like the factory being in a hurry more than anything else, and the percentages are tiny