Theory of Operation
WARNING: This page is about a different car, the 2011 RAM Pickup and 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
There are two purposes to this diagnostic test. The first purpose is to try to determine whether an engine misfire or rough running condition can be narrowed down to a specific cylinder or if it is due to a fuel, air handling, or exhaust system issue. The second purpose is to help the technician follow the correct path to diagnose and completely repair the system at fault.