Last week my water pump locked up. fried the timing belt and the motor stalled. after replacing the pump and timing belt got it running. 3 days later it quit again. It seems the idler and tensioner pulleys/bearings were either affected by the antifreeze or they just went south. anyway the seals on both the bearings fell into the path of the timing belt and it jumped time. junked the new timing belt 34.00 and had to buy new pulleys 112.00 and 97.00. toyota only part. I would check thoes parts if you are in there. if toyota is going to do it im sure they will let you know if they are bad.