I have a detroit series 60 ddec III, my jake brake or cruise control dont work. the cluth switch is working but i have on one cable 3.9 v and the other one4.1v am i supposed have power on both cables. and dont have schematics for clutch switch. when i read pro link the clutch switch dont go on and off when clutch is pressed. i also have code 57 for data link j1922 failure.
Make (other): peterbilt
Engine: detroit series 60 DDEC III
Have you tried unplugging the clutch switch to see if that makes a difference?
yes i have, and it dont make a difference
I wish I had a wiring diagram for you because I really think you have a broken wire from the clutch switch to the ECM. I wish I could be more help.
Hello, try these diagrames, they are for a DDEC II but the wiring should be the same, pay close attention to air swithches, if they are not working right the ECM won't turn on cruise or jake. If you have any more questions, just ask I'll be on and off Just Answer. Thanks for using Just Answer.Diesel Service40369.5694583681
25 years experience, on highway tractor trailer