Originally Posted by david s poole

with my retriever scanner[mb dedicated] i determined that the e.a. had two or three codes that i couldn't erase and when i tried to access the isc it said error no communication.at that point i dug up the etm and traced the wiring back to idle speed computer.i pulled off plug,opened case and bingo burned smell.went and found another for 150 in salvage yard.[i was lucky enough to have similar car in shop and tried that unit first and it worked]