NHK has learned that a subsidiary of Japanese engineering giant IHI has become embroiled in a data-rigging scandal. The engine maker was found to have falsified fuel consumption numbers.
Sources say IHI Power Systems rigged data on fuel consumption ratios in a report for buyers on trial runs of ship engines.
The data was reportedly rigged for more than 1,500 units out of about 1,900 total produced from 2003 onwards. They were shipped for the Japanese market.
Sources say approximately 800 of the engines failed to clear levels agreed upon in business contracts.
The government plans to launch an investigation. The transport ministry is calling on IHI Power Systems to report on the details.
IHI has admitted there was wrongdoing at the subsidiary. It told NHK it is investigating the matter.