TOKYO—Toyota Motor Corp. President Akio Toyoda on Friday extended his support to a senior executive arrested on suspicion of violating Japan's tough drug laws, but stopped short of guaranteeing that she would keep her job.

Mr. Toyoda, moving quickly to try to contain the fallout from the arrest of Julie Hamp, Toyota's head of corporate communications, described her as a "close friend of mine and an invaluable member of Toyota's team."

Ms. Hamp, an American who is the most senior female executive at the company, is in police custody after she was arrested Thursday at the Tokyo hotel where she was staying. The police say customs officers intercepted a package addressed to Ms. Hamp containing about 60 tablets of oxycodone, a powerful painkiller.

Though oxycodone is legal with a prescription in Japan and the U.S., it is illegal to bring it into Japan without special authorization. Oxycodone, an opiate, is also widely used illegally as a recreational drug in the U.S.

Toyota, at a hastily scheduled news conference, declined to say whether Ms. Hamp had a prescription for oxycodone or a medical condition that would require its use. Executives said the company was cooperating fully with the authorities, but added that privacy issues prevented him from discussing particulars of the case.

When asked whether Ms. Hamp, if cleared of wrongdoing, would keep her job, Mr. Toyoda said, "I believe that future investigations will show that she had no intention to violate the law."

Ms. Hamp, who hasn't been charged with any crime, hasn't commented publicly since her arrest.

Along with Didier Leroy, a Frenchman who was named as an executive vice president, Ms. Hamp is one of two foreigners appointed to senior roles this year at Toyota, which is trying to diversify its largely male and Japanese executive ranks.

Mr. Toyoda said the arrest wouldn't stop the company's diversity push. Indeed, he said the company would redouble its efforts to make foreign employees feel welcome in Japan.

"Maybe we didn't have enough support to prepare her for her stay in Japan," Mr. Toyoda said, describing company executives as being "like my children."

Mr. Toyoda's decision to speak out on the case even as the investigation is still unfolding highlights his application of lessons learned through a series of missteps six years ago, when complaints of unintended acceleration in some Toyota cars began to emerge. At the time, Mr. Toyoda, still new to his post, was criticized as being too slow to react.

The complaints ultimately led to recalls of more than 10 million Toyota cars in the U.S., a congressional probe, a class-action lawsuit and a criminal investigation that the company paid $1.2 billion to settle.

Write to Eric Pfanner at eric.pfanner@wsj.com and Yoko Kubota at yoko.kubota@wsj.com

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