Toyota profit has continued to surge with second quarter earnings nearly doubling to 98.7bn yen.
The company raised its profit forecast again, predicting earnings of 380bn yen ($4.7bn, £2.9bn) for the full year.
But executive vice president Satoshi Ozawa said the strong yen was threatening production levels.
Sales were also boosted by green car subsidies in Japan, but these have now come to an end.
Ozawa said there was a "very tough business environment, characterised by the radically and seriously appreciated yen in recent months, the risk of slowdown in demand recovery in the United States and Europe, and falling demand following the end of the eco-car subsidies in Japan."