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Old 11-23-2019, 08:25 PM   #11
Midwestdrifter
 
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

Sometimes a glow plug only fails open when hot. The fuse method is one way to check. Another is a clamp on ohm-meter. Clamp on to each wire (with 10 minutes cooldown in between). Cycle the ignition on. The plug should pull 20A or so for a few seconds, then taper down to ~5A. If it drops right off, you may have a failed plug.

The code itself won't cause issues, assuming you are not having trouble starting.
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Last edited by Midwestdrifter; 11-23-2019 at 08:41 PM.
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Old 11-23-2019, 10:53 PM   #12
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

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Originally Posted by Midwestdrifter View Post
...

The code itself won't cause issues, assuming you are not having trouble starting.


Unless there is an emissions test in the future. Depending upon the jurisdiction, some states/areas require the MIL aka CEL to be off with no emissions related DTC's.

vic
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Old 11-24-2019, 12:18 AM   #13
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

Well guys you are right about doing the fuse test regardless of what the error codes say. I've tested all the 5 circuits in many ways, consistently glow plug #2 blows the (25A) fuse 3 times, no other plugs do that, no shorts to ground or to other wires found in the wiring.

So in summary the message "Cylinder 1 glow plug circuit open" means "Cylinder 2 glow plug circuit shorted to the ground" . So time to replace plug #2 and we will see how it goes after that.

Thanks!!!!
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Old 11-25-2019, 04:21 PM   #14
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

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Originally Posted by Cheyenne View Post
Somebody posted a wiring diagram recently that showed Glow Plug 1 as being cylinder 5, GP 2 as Cyl 4, GP 3 as Cyl 3, GP 4 as Cyl 2 and GP 5 as Cyl 1
I’ve never physically traced them, but the diagram shows the module connector’s pins 5..1 feeding cylinders 1..5 (pin 6 is not connected).
So if the module reports its faults by pin then the codes will point at the wrong plug...
(in my case I had a few bad plugs, so skipped further diagnosis and simply replaced all five, and repaired three blown fuse links within the original module)

-dave
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Old 11-25-2019, 05:22 PM   #15
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

Correspondence between glow plug numbers and pin numbers (you'll have to squint):

GlowPlugControl.png

Image from 2006 service manual: http://diysprinter.co.uk/reference/2006-VA-SM.pdf
(which you can zoom into to enlarge the pin numbers without loss of quality)

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Old 11-25-2019, 11:44 PM   #16
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

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Originally Posted by LeisureSprinter View Post
Well guys you are right about doing the fuse test regardless of what the error codes say. I've tested all the 5 circuits in many ways, consistently glow plug #2 blows the (25A) fuse 3 times, no other plugs do that, no shorts to ground or to other wires found in the wiring.

So in summary the message "Cylinder 1 glow plug circuit open" means "Cylinder 2 glow plug circuit shorted to the ground" . So time to replace plug #2 and we will see how it goes after that.

Thanks!!!!
Hmmm... browsing “The Complete Fault Code Guide”, they only list one glow plug fault for the CDI3 (engine) module:
1482-1 pre-glow “at least one gp has a short circuit”

http://diysprinter.co.uk/reference/T...tCodeGuide.pdf

I’ve noticed that the CDI3 module seems to map its (usually very detailed) internal fault codes (as returned by the Sprinter-specific Module/Read Codes menu path) onto the EPA-mandated OBDII faults (accessed by generic scanners, or by using the OBDII menu on even the best scanners)
The generic faults are usually less specific, but in this instance it would seem that MB chose P0671 / P0380 as a stand-in to satisfy the EPA, even though it is more specific?

It would explain why even Dr. A continues to recommend the “fuse test” to diagnose failed plugs, rather than simply trusting the fault code generated.

-dave

Last edited by Nautamaran; 11-26-2019 at 01:56 AM.
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Old 01-25-2020, 07:40 PM   #17
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

Quote:
Originally Posted by LeisureSprinter View Post
Well guys you are right about doing the fuse test regardless of what the error codes say. I've tested all the 5 circuits in many ways, consistently glow plug #2 blows the (25A) fuse 3 times, no other plugs do that, no shorts to ground or to other wires found in the wiring.

So in summary the message "Cylinder 1 glow plug circuit open" means "Cylinder 2 glow plug circuit shorted to the ground" . So time to replace plug #2 and we will see how it goes after that.

Thanks!!!!
LeisureSprinter,

Did plug #2 replacement correct the error codes or was it something else?
I have the same error codes that you had.

And is that #2 from the front of the engine?

Thanks

Last edited by rv-sprinter; 01-25-2020 at 07:42 PM. Reason: Another question
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Old 01-25-2020, 08:05 PM   #18
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

I’ve dealt with this issue of incorrect glow plug mapping before. I Like to change them all which eliminates the issue. Of course that can open a can of worms with a set that hasn’t been changed in a long time or from a corrosive environment. Btw if your using an eBay Chinese new $35 controller might as well throw it in the trash they are complete garbage.
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Old 01-25-2020, 11:44 PM   #19
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

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Originally Posted by rv-sprinter View Post
And is that #2 from the front of the engine?
For the OM612 and OM647 5 cylinder engines used in the US/Canada market: yes.
Number 1 is closest to the radiator, #5 is closest to the driver.

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