2/4 Clutch
WARNING: This page is about a different car, the 2016 Dodge Journey and 2015 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.
Apply air pressure to the feed hole located on the test plate marked 2/4 clutch. Listen for an audible thud. The piston should return to its original position after the air pressure is removed.