Saikawa is scheduled to brief the transport ministry on its findings ahead of the news conference. Last month, Nissan issued the 1.2 million-vehicle recall - including all passenger cars it produced for sale in Japan over the past three years - after discovering that uncertified inspectors were for decades signing off on vehicle checks required by the transport ministry for cars sold in Japan. As a result, Nissan suspended production of all vehicles for the domestic market for around three weeks, resuming output at its six Japanese assembly plants last week. The investigation has also found that in some cases Nissan's process to train certified inspectors was shorter than reported to the ministry, while in others, answers to certification exams were provided to trainees in advance. Nissan expects the recall alone will cost it 25 billion yen ($222.10 million), and last week shaved its full-year operating profit forecast as it braces for the fallout at home.