TOKYO - Toyota is fixing the pump that cools the hybrid system in 650,000 Prius cars -- the Japanese automaker's prized green vehicle -- but is adamant the repair being carried out worldwide isn't another recall.

Toyota Motor Corp. spokesman Paul Nolasco said Tuesday the coolant pump in Prius cars for model years 2004 through to 2007 is being replaced because it doesn't work properly.

But the Japanese automaker is calling the move a "customer satisfaction campaign" because the problem doesn't warrant a recall under regulations where the vehicles have been sold, according to Nolasco.

Of the Prius cars that need fixing, 390,000 are in North America and 180,000 are in Japan. The problem affects 70,000 Prius vehicles in Europe.

The problem with the Prius, which is closely associated with Toyota's reputation for innovative technology, is the latest embarrassment for the world's No. 1 automaker, which has recalled more than 11 million vehicles globally since late last year.

The massive recalls cover a wide range of models for various problems, including faulty gas pedals, floor mats that can trap accelerators, defective braking and stalling engines.