Yesterday I went to change out the drive side injector return lines and I unbolted the bale connectors but did not unhook them. After I went to start the truck my oil pressure gauge wouldn’t work and my edge wasn’t lighting up. As soon as I touched the screen my glow plug light would come on and stay on. Shut the truck off and went thru and found a plug behind the a/c compressor that had come undone. Plugged it back in and my oil pressure worked again and the edge come on with the key. Now I’m getting codes for no communication to ecm and glow plugs are not working now. Any ideas? Any wiring diagrams I can check?
Download the electrical manual here: Note that the manual covers 2003-2006
If the line to the MAF temperature sensor is broken the ECM will think it's -30° outside so command glow plugs to be on longer
That makes sense. For some reason now it’s not even cycling glow plugs and just has the code for it. Gonna pull the split loom off this evening and check it over really well. This truck has been a pain since day one and I just want to drive it without a light on.
Thank you so much for those going to check some of that stuff out. The other day the glow plugs were working fine and had no other codes other than glow plug circuit 3. Now that code is gone and I have all these others with no glow plugs at all