1. Remove the timing belt cover (LH).

2. While cranking engine at least four rotations, check the timing belt back surface for cracks or damage. Replace faulty timing belts with new parts as required.

3. If the face of the timing belt is abnormally worn (knotted surface lint or belt core protruding) or damaged, check the idler, tensioner, water pump pulley and cam sprocket for idler alignment (perpendicularity). Replace worn timing belts with new parts.

4. Install the timing belt cover (LH).