you can take the icm, out and have it tested, but most of the time the test says good when its bad. jy's are the best place short of new to get another one. also make sure the ground wire is bolted on and the wire is good. its a single black wire bolted to the side of the head under the icm.

and on the bottom is a strip of wires, its bolted on in the middle of the plug, 7 mm i think.