A Daihatsu spokesperson also told reporters that Toyota has been helping review Daihatsu's business restructuring.

Toyota said on Tuesday that it plan to announce in about a month steps to overhaul Daihatsu, its small-car specialist, after an investigation into misconduct at its unit related to rigged collision-safety tests found issues going back decades.

(Reporting by Maki Shiraki, Written by Mariko Katsumura; Editing by Muralikumar Anantharaman)