Toyota Motor Corp.'s truck-making subsidiary Hino Motors Ltd. on Friday announced the resignations of four executives over a fraudulent emission data reporting scandal that goes back some 20 years, saying it will also ask former executives to return part of their compensations.

The four -- three board members, including one in charge of production, as well as an executive who leads the company's technological development division -- resigned Friday.

Logo of Hino Motors Ltd. (Kyodo)

The former executives the company will ask to return salary will be those who served in executive roles from 2003 and thereafter, the automaker said.

President Satoshi Ogiso will remain in his post to oversee the process of management renewal, though his monthly salary will be halved for the next six months. Other executives are also taking a pay cut.

Ogiso reported to transport minister Tetsuo Saito on Friday afternoon the measures the automaker will take to prevent a similar issue from occurring.

Saito urged Ogiso to conduct a thorough reform of the company, saying, "I hope you put an end to a long-running practice of misconduct and push ahead with the reform." Ogiso vowed to ramp up efforts to make Hino "reborn."

The transport ministry had issued a corrective order to the truck maker in early September, demanding it come up with measures within a month to prevent similar misconduct.

Hino admitted in March this year that it submitted fraudulent emissions and fuel economy data to transport authorities, suspending the shipment of vehicles with engines for which the figures had been doctored.

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