How do you replace the belt tension pulley on a 2003 2.4 L Toyota Camry?

To replace the belt tension pulley on a 2003 2.4 L Toyota Camry, first, disconnect the negative battery terminal for safety. Use a wrench to loosen the tension on the serpentine belt by rotating the tensioner pulley, then remove the belt from the tension pulley. Unbolt the old tension pulley from its mounting bracket and install the new pulley in its place, tightening the bolts securely. Finally, re-route the serpentine belt over the new pulley and restore tension before reconnecting the battery.