I don't know what you were testing doing that. To check for a jumped chain you need to verify that the crankshaft gear and camshaft gear are in fase with each other. You mechanically verify tdc on cylinder #1. If you don't know how I will send you a link. Then all you would have to do is look at the position of the timing mark on the harmonic balancer. Simple it is either lined up or it isn't.
