dnevins
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• Subscriber since 12/29/2009 |
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• San Diego, CA, USA |
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• Registered on 12/28/2009 |
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• 340 posts |
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P0683 isn't saying your glow plugs are bad, which fits the truck starting fine in the cold. It means the glow plug control module (GPCM) is reporting an open or short on its diagnostic communication line to the computer, the circuit on pin 9 of the module's green connector. A bad glow plug sets its own code, P0671 through P0678 (one for each cylinder).
That's also why the new solenoid didn't clear it. Ford used the GPCM in place of the old glow plug relay on late 1999 to 2003 7.3s with the California emissions package, and the 2000 to 2003 Excursion is on that list. P0683 is a code about the module itself, so your truck should have one: a module on a bracket on the passenger side valve cover studs, in the spot where the relay would be, with two big plugs (one green, one black). Take a look to confirm. With that module, there's no glow plug relay in the circuit, so a new solenoid can't clear this code.
What to check:
1. Unplug both GPCM connectors, look for corroded or pushed-back pins, clean them and plug them back in firmly. A loose or corroded connector is the first thing to rule out.
2. Check the pin 9 wire on the green connector for chafing or a break between the module and the computer.
3. If the connectors and wiring are good, the GPCM itself has most likely failed, and replacing it fixes the code.
Dana
https://partslogic.com |
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Posted:10/26/2007 10:06