timing chain
The alternator is rotated on it's pivot to adjust belt tension.
You don't, it has a spring loaded tensioner, If the serpentine belt is loose the tensioner has failed and needs to be replaced
Adjust it.
Loosen the alternator tensioner bolt. You will be able to slide the alternator either way to adjust the tension on the belt.
If it is a drive belt and not a serpentine belt is has no tensioner. You manually adjust the tension by normally adjusting tension by moving the alternator. Loosen to bolts holding the alternator in place and then adjust the tension. Tighten the bolts when the tension is right. If it is serpentine belt if you follow the belt around the the engine you will see the tensioner.
how to replace drive belt 2003 Toyota matrix
Yes. Timing belt is correct.
There is no way to adjust the belt tensioner, if it's not keeping enough tension on the belt the complete tensioner itself will need replaced.
you do not adjust tension on a serpentine belt the tension is automatcally adjusted if the belt is loose, replace the belt SOME TIMES THE TENSIONER CAN BE WEEK ALSO.
The 1989 Toyota Corolla serpentine belt can be tightened or loosen with the tensioner pulley. Pry to the left on the tensioner pulley until the belt is tight. Tighten the tensioner pulley.
you don't. 2003 Toyota matrix xrs does not have a timing belt. It has a timing chain which never needs replacing.