The Toyota 2.2 Liter 4 cylinder engine is not an interference type engine. So if the timing belt fails the engine just stops running with no damage to the engine. Since the front of the engine is going to be opened up to do the timing belt. now would be the time to replace the water pump. As far as tensioner/idler pulleys, just have them checked for bearing wear since the engine only has 37,000 miles on it.
Tester