Medium and Heavy Trucks
Have Truck Repair Questions? Ask an Expert
Hi Jared. My name is***** will be glad to help. Check the wiring harness and connector pins at the ECM for any corrosion or damage that might cause an open circuit for the ECM and if okay verify the power and grounds for the ECM. If they check okay I recommend having the ECM tested or if you could obtain a test ECM if possible as it would lean towards a faulty ECM. From the sounds of it you likely have the schematics already?
Hi Jared. I have the full electrical manual I can offer for an additional service or would you just like individual parts such as the power and grounds for the LLY engine?
Not sure why but I can not post the offer for you unless there are two responses from you on this chat page. It is how the site is set up. ill post the offer once there is another reply. It is 321 pages of schematics for this truck.
Click on this link for the ECM connector pinouts I uploaded for you. Let me know if you need more info or help.