TOKYO: Japan's transportation ministry today raided the Tokyo offices of truck maker Hino Motors Ltd days after the Toyota Motor Corp unit said it had falsified emissions data, triggering its biggest one-day shares slump for 22 years.

Public TV station NHK broadcast footage showing officials from the ministry entering the company's headquarters on Monday morning. Hino on Friday said it had found "misconduct" in falsifying engine performance for exhaust emissions certificates, and had also found problems in engine performance.

The company's shares plunged 17%, dropping by the maximum daily limit allowed under Tokyo exchange rules. The stock also fell heavily on Friday, when reports of irregularities first emerged.

Hino is the latest in a string of Japanese automakers involved in improper emissions tests.

In 2018, the government said Mazda Motor Corp, Suzuki Motor Corp and Yamaha Motor Co improperly tested vehicles for fuel economy and emissions. Subaru Corp and Nissan Motor were under scrutiny for the same reason the year before.

A spokesman for Hino confirmed the ministry officials had visited the company but declined further comment.

"The government is aware that transportation ministry carried out a raid on the company to investigate the matter and the cause," chief cabinet secretary Hirokazu Matsuno said on Monday afternoon.

"The matter is extremely regrettable, as it greatly undermines the trust of automobile users," Matsuno said.

Hino has suspended sales of three engine models as well as vehicles carrying them in Japan, the company said in a statement, adding it is investigating the impact on its earnings.

About 115,500 vehicles in Japan are believed to equipped with the engine models that have false emissions data or fuel efficiency problems, according to the statement. The figure is almost twice of the number of vehicles Hino sold domestically in the 12 months ended March 2021.

The accuracy of automakers' emissions data was thrown into doubt in 2015 when Germany's Volkswagen AG admitted to installing secret software in hundreds of thousands of US diesel cars to cheat exhaust emissions tests, and that as many as 11 million vehicles could have similar software installed worldwide.

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