[ynpmoose]

I need to troubleshoot my P0671 glow plug soft code and found these docs. I think i can actually test through the GP bus bar harness plug to see if my GP resistance is correct without pulling the bus bar out (at least to start with). I also spoke to my local Ford dealer diesel tech (super awesome dude will answer all kind of questions, print out troubleshooting docs for you, etc.) and he seemed to think I am more likely to have a failed GPCM versus the GP itself, even though I'm only throwing a single cylinder code.

I'll give these docs a run-through tomorrow. I figure at the least I can maybe saved busting up a perfectly good bus bar only to find out the GP wasn't bad.

 

[seanhoffman]

Testing the module is easy. It right on top. Tons of videos on the subject. But having just replaced 1,3,5,6 GP i bet its just a glow plug. Do yourself a favor and watch some videos on removal using a screwdriver and some #10GA wire....works great when pulling the harness

 

[ynpmoose]

Fixed it up today. Cylinder 1 GP ohm tested at 22 instead of .5 to 2 through the harness. I followed Dave's "through the wheelwell" instructions in the forum tech articles. I have the solid bus bar, so no wire needed. Just some gentle prying. My bus bar is only 6 months old so it wasn't brittle yet.