Here's all you should need to diagnose:

CAMSHAFT CHECKING ADJUSTMENT.pdf
CAMSHAFT TIMING CONTROL FUNCTION.pdf
CAMSHAFT POSITION SENSORS CHECKING.pdf
CAMSHAFT ADJUSTMENT VALVES CHECKING.pdf
CAMSHAFTS AND CAMSHAFT ADJUSTER RIGHT CYLINDER HEAD.pdf
CAMSHAFTS AND CAMSHAFT ADJUSTER LEFT CYLINDER HEAD.pdf

I included the left cylinder head just for good measure. At TDC, you should see 15 links on the driver's side and 16 links on the passenger side. There are pictures in the attachments to show you exactly how it is supposed to look.