"The upgrade reflects Moody's expectation that Nissan's new product cadence, its continuing focus on cost controls and its commitment to building global brand value will enable [Nissan] to sustain the strong performance," in its latest fiscal year, Moody's said in statement. But the agency also warned about the potential impact of a strong yen and slowing growth in China, Nissan's biggest market. In May, Nissan posted a 341.43 billion yen ($4.28 billion) full-year net profit and record sales for the year to March, as the automaker shrugged off the devastating impact of last year's quake-tsunami disaster on production. Rivals Toyota and Honda saw profits plunge during the same period.