Investors bracing for a potentially radical change in one of the world's largest carmaking alliances can rely on one thing: its driving force staying put.

Carlos Ghosn, who built the three-way union of Renault SA, Nissan Motor Co. and Mitsubishi Motors Corp., said overseeing the group is a job he can keep adding value to and isn't looking to relinquish. Ghosn will further reduce his roles at the three individual companies once his contribution becomes "limited," the 64-year-old executive said in an interview in Yokohama.

"If there is one job for which I'm still having a strong contribution, it is chairman and CEO of the alliance," Ghosn said. "I have played a historic role in building this alliance and I have legitimacy in the three companies that allows me today to act in the way that maybe other people would not be able to."