Inspect the belt for cracks or damage. If the belt is cracked or damaged, replace it.
Check that the position of the auto-tensioner indicator (A) is within the standard range (B) as shown. If it is out of the standard range, replace the drive belt.

Drive Belt Auto-Tensioner Pulley Replacement
Remove the auto-tensioner.
Remove the tensioner pulley.
Install the tensioner pulley in the reverse order of removal.
Install the auto-tensioner.
...
Removal
Do the battery terminal disconnection procedure.
Remove the drive belt.
Remove the intake manifold.
Disconnect the alternator connector (A) and the p ...
EPS Control Unit Removal/Installation
Do the battery terminal disconnection procedure.
Remove the under-dash fuse/relay box.
Disconnect EPS control unit connector A (11P) and connector B (16P) by
pus ...