Turn the vehicle to the ON mode, and make sure to turn the A/C switch OFF, then turn the vehicle to the OFF (LOCK) mode.

Check the position of the drive belt auto-tensioner indicator pointer (A) and the indicator (B).

Start the engine, then check the position again with the engine idling. If the position of the indicator moves or fluctuates a lot, replace the drive belt auto-tensioner.

Check for abnormal noise from the tensioner pulley. If you hear any abnormal noise, replace the drive belt auto-tensioner.

Move the drive belt auto-tensioner within its limit using a wrench in the direction of the arrow. Check that the drive belt auto-tensioner moves smoothly and without any abnormal noise. If the tensioner does not move smoothly, or if you hear any abnormal noise, replace the drive belt auto-tensioner.