Oh My... The dreaded Check Engine Light!
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Junior User
Joined: Jan 2006
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Oh My... The dreaded Check Engine Light!
About a month ago I took my girls to a drive in movie. The truck sat on those little hills to get a beter view of the screen for 4 hours while we watched the movies with the key on acc and listening to the movie thru the radio. When the movie ended and I started the truck the dreaded check engine light came on. I took the truck into work the next day and pulled the code P0683 from the system. I cleared the code and have not seen it again until this mornig when again the same code came up. My shop has nothing on diesel trucks and the smog machine states it is an unknown code. A quick search thru All Data says it is related to the glow plug system? Says short to ground? It says to get the breakout box out? I don't have such a thing! Any ideas where to start? If I need to pull the valve cover gaskets how can I tell what one to pull?
Thanks!
Steve
Thanks!
Steve
Fleet Mechanic
Joined: Feb 2005
Posts: 1,797
Likes: 1
From: Northern Colorado
GPM or GPCM = Glow Plug Control Module
GPR = Glow Plug Relay
The CA trucks and Exs have the control module for emissions that give feedback to the PCM as to the function of the Glow Plugs. The communication circuit DTC would indicate that you may have a chaffed or broken signal wire going to the PCM or the GPCM is simply going out and is fritzing intermittently. The GCPM gets control power from the PCM power relay so I doubt if it's a blown fuse otherwise your PCM would also die (as in dead in the water.)
GPR = Glow Plug Relay
The CA trucks and Exs have the control module for emissions that give feedback to the PCM as to the function of the Glow Plugs. The communication circuit DTC would indicate that you may have a chaffed or broken signal wire going to the PCM or the GPCM is simply going out and is fritzing intermittently. The GCPM gets control power from the PCM power relay so I doubt if it's a blown fuse otherwise your PCM would also die (as in dead in the water.)
Hotshot
Joined: Jan 2002
Posts: 17,988
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From: La La Land
I think that was Kwik's photo, but I don't find it in his gallery.
If I recall, it was a glow-plug wire that was rubbing on a pushrod.
A new under-valve-cover wire loom with upgraded (slightly different) routing solved the problem.
Pop
If I recall, it was a glow-plug wire that was rubbing on a pushrod.
A new under-valve-cover wire loom with upgraded (slightly different) routing solved the problem.
Pop
Last edited by SpringerPop; Mar 17, 2007 at 12:22 AM.
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Cargo Master
Joined: Jun 2003
Posts: 3,292
Likes: 6
From: Ardenvoir, Washington
If you remove your valve covers, be sure to check your 9 pin injector/glow plug connectors.. Mine were loose on both sides with about gap of about a 1/4". The driver side was the worst and caused one injector not to work sometimes . Ford got a plastic clip as a fix but I just made a 1/16" thick shim to slip behind the locking tabs of the connector..
Also, you can check the 9 pin connectors on the outside of the valve cover with a ohm meter for the proper resistance.. It might show which valve cover wiring is bad.
Also, you can check the 9 pin connectors on the outside of the valve cover with a ohm meter for the proper resistance.. It might show which valve cover wiring is bad.
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Junior User
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So should I assume that the problem could be under the valve covers? I can't find a wire diagram for this and have no idea where to start. It runs fine just the check engine light staring at me as I drive. Everything I read says to hook up the breakout box. (which I don't own) No one else has had this code or problem?
Steve
Steve
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