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persistant p0683 GCU module *update, continuity test done*
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=63178		 Page 1 of 1
Author:  KurtP [ Sun Oct 16, 2011 7:21 am ]
Post subject:  persistant p0683 GCU module *update, continuity test done*
Its been back to the dealer 3x to have this check engine light resolved, but every morning i start it up and as soon as i start drivig the cel for this fault code comes on.

The first time it happened i requested the fast metallic plug kit fix, and they said no problem. They screwed up the first time by putting in the wrong relay, then they screwed up again by noy putting on the right ecu flash. They replaced everything again, and im pretty sure they got the ecu flashed because as my other thread indicates, the cruise control wont come on any more.

As i see t, the three most likely options are
1- operator error. I turn the key to on, wait for the lightning bolt and the red circle light to go out, then start it up and start driving. Am i doing something wrong?

2- dealership incompetence or dishonesty. How do i check to make sure that infact the fast metallic plugs and relay are in there, and that they actually have the right ecu flash

3- some other larger problem that i am un aware of.

I dont know my way around a diesel all that well, but im automotively/technically inclined, so ive decided its probably time to fix this myself since its obvious the dealer cant do it.

Thanks for helping the n00b
Author:  Billwill [ Sun Oct 16, 2011 8:13 am ]
Post subject:  Re: persistant p0683 glow plug control module
KurtP wrote:
Its been back to the dealer 3x to have this check engine light resolved, but every morning i start it up and as soon as i start drivig the cel for this fault code comes on.

The first time it happened i requested the fast metallic plug kit fix, and they said no problem. They screwed up the first time by putting in the wrong relay, then they screwed up again by noy putting on the right ecu flash. They replaced everything again, and im pretty sure they got the ecu flashed because as my other thread indicates, the cruise control wont come on any more.

As i see t, the three most likely options are
1- operator error. I turn the key to on, wait for the lightning bolt and the red circle light to go out, then start it up and start driving. Am i doing something wrong?

2- dealership incompetence or dishonesty. How do i check to make sure that infact the fast metallic plugs and relay are in there, and that they actually have the right ecu flash

3- some other larger problem that i am un aware of.

I dont know my way around a diesel all that well, but im automotively/technically inclined, so ive decided its probably time to fix this myself since its obvious the dealer cant do it.

Thanks for helping the n00b



Probably Dealer incompetence!
You have a Lightning Bolt and Red circle? My CRD has a yellow curly squigle that goes out once the glow plugs have warmed up :? I suppose they may have changed the symbol on later CRDs.
Author:  racertracer [ Sun Oct 16, 2011 10:34 am ]
Post subject:  Re: persistant p0683 glow plug control module
KurtP,

You will need to pull one of the plugs to check and see if they are metal, there is a picture showing the difference of the glow plug tips (metal vs ceramic) so that you can compare. Locate the easiest plug you can reach and pull it, should be easy to do since it was just changed because you wont need much elbow grease to loosen it.

2. Remove the glow plug relay and check to see if it has this number on the side of it 56044671ac, the relay is black plastic and rectangular in shape located near the battery and attached to the wheel well with a plastic push plug.

3. Regarding the ECU flash, the only way I know of checking to see if it has the latest flash is by having the dealer confirm it on paper. Tell them to write down on the paper the number of the latest flash that they downloaded and installed in your ecu. Not sure what that number is but it was posted some time ago and I can't find the post.
Author:  KurtP [ Sun Oct 16, 2011 11:01 am ]
Post subject:  Re: persistant p0683 glow plug control module
Ok thanks. Ill try to check that stuff today. Anything else i should consider?
Author:  racertracer [ Sun Oct 16, 2011 11:41 am ]
Post subject:  Re: persistant p0683 glow plug control module
The dealer should give you an answer as to why the problem has not been resolved yet.

In case your dealer is not responsive, is there another dealer in the area that can confirm the ECU update and that the work was done?
Author:  KurtP [ Sun Oct 16, 2011 12:26 pm ]
Post subject:  Re: persistant p0683 glow plug control module
I agree they should, but for whatever reason they cant....they are either trying to save a buck and not really replacing the parts, or incompetent and screwing it up.

It takes me over an hour of driving every time i talk to them, so im just ready to figure it out myself and have it be right.
Author:  racertracer [ Sun Oct 16, 2011 12:32 pm ]
Post subject:  Re: persistant p0683 glow plug control module
Good luck.
Author:  KurtP [ Sun Oct 16, 2011 12:40 pm ]
Post subject:  Re: persistant p0683 glow plug control module
racertracer wrote:
Good luck.



LOL :mrgreen:
Author:  papaindigo [ Sun Oct 16, 2011 12:54 pm ]
Post subject:  Re: persistant p0683 glow plug control module
KurtP - you might want to call GDE, I cannot find it but seem to recall GDE posting a quick way to tell what glow plugs you had (ceramic vs. metallic) without pulling any glow plug. Something about a black band or some such.

Not sure what lights you are referring to. The only thing that looks like a lightening bolt is a electric throttle control warning lamp that cycles on/off as a bulb test when you first start up. Check your owners manual for what the red circle thing is. If you don't have your owners manual open the glove box and feel up on the invisible top shelf where Jeep hide the owners manual (lots of folks that don't have the manual find it there). If it's not there you can get a PDF copy from the Jeep site or Sir Sams NOOB guide link.
Author:  MrMopar64 [ Sun Oct 16, 2011 12:57 pm ]
Post subject:  Re: persistant p0683 glow plug control module
This fault is related to wiring and shouldn't have anything to do with what flash or GCU was installed.

First check for correct voltage at the GCU: if you unplug it, you'll see some pins labeled "30" and "87". With the key-on, there should be power on both; with key-off, power only at "30."

If power looks okay, it's necessary to check the wiring for the diagnostic circuit from the GCU to the ECU.
Check continuity between the "DI" pin and B43 (B-connector is the small one).

If all this is fine, then I would try to replace the GCU with a new one.

If you disconnect the connector from the glow plug, you will see a colored plastic insulator. It should be that red is fast metallic, white is fast ceramic, black is low speed/high voltage metallic.

Can you confirm also the P/N of the GCU in your vehicle? Both the Chrysler P/N and the Bosch P/N should be printed on outside of the housing.
Author:  KurtP [ Sun Oct 16, 2011 1:18 pm ]
Post subject:  Re: persistant p0683 glow plug control module
Im going to stop on the way home and buy a volt meter and ill start checking this stuff once im off work
Author:  KurtP [ Sun Oct 16, 2011 3:06 pm ]
Post subject:  Re: persistant p0683 glow plug control module
Ive confirmed that the ecu flash is the most recent for a 06 w/ metallic plugs. Bosch Part number for glow plug controller: 0281003034 CY pn 56044671AC...so those are right.

Im looking for the glow plugs :ROTFL:

:D
Author:  KurtP [ Thu Oct 20, 2011 9:25 am ]
Post subject:  Re: persistant p0683 glow plug control module
MrMopar64 wrote:
This fault is related to wiring and shouldn't have anything to do with what flash or GCU was installed.

First check for correct voltage at the GCU: if you unplug it, you'll see some pins labeled "30" and "87". With the key-on, there should be power on both; with key-off, power only at "30."

If power looks okay, it's necessary to check the wiring for the diagnostic circuit from the GCU to the ECU.
Check continuity between the "DI" pin and B43 (B-connector is the small one).

If all this is fine, then I would try to replace the GCU with a new one.

If you disconnect the connector from the glow plug, you will see a colored plastic insulator. It should be that red is fast metallic, white is fast ceramic, black is low speed/high voltage metallic.

Can you confirm also the P/N of the GCU in your vehicle? Both the Chrysler P/N and the Bosch P/N should be printed on outside of the housing.


Ok, I found that the 30 and 87 pins checked out fine, but there was no continuity between b43 and DI pin....I could get continuity from the DI connector port to a piece of shielding i peeled back just on the back side of the GCU connector, and same for the B43 pin on the ECU...i just couldnt get continuity from the ECU side to the GCU side....power was off for test

Whats next? Run a new wire? or is there a switch/relay somewhere in between? Im extremely curious how this wire went bad :confused:
Author:  KurtP [ Sat Oct 22, 2011 9:07 am ]
Post subject:  Re: persistant p0683 GCU module *update, continuity test don
Nothing?
Author:  Joe Romas [ Sat Oct 22, 2011 11:22 am ]
Post subject:  Re: persistant p0683 GCU module *update, continuity test don
KurtP wrote:
Nothing?



Carefully remove the pins from the connector and check the crimp connection. As a last resort replace the wire.
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