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Old 11-23-2019, 06:45 PM   #1
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Default Glow plug circuit open P0671 running out of ideas :-(

hi, I'm having
P0671 Cylinder 1 glow plug circuit open and
P0380 Glow plug heater circuit A

Clearing them many times, they come back.

I have measured cable resistance between controller and plug 0.9 ohm, cable seems good

Replaced the controller - no change

Measured plug to block 1.4 ohm, replaced the glow plug anyway, installed new Bosch plug, also 1.4 ohm (after the new plug the errors disappeared for a few starts and came back)

So with a cable which appears to be good, and replacing the controller and glow plug making no difference, what else could be wrong?

thanks!!!
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Old 11-23-2019, 06:46 PM   #2
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

And I have also sprayed both ends of the cable with DeoxIT to make sure the contacts are good
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Old 11-23-2019, 07:02 PM   #3
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

Do you have an original controller?

The old glow plug modules blow permanently for each fuse

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Old 11-23-2019, 07:12 PM   #4
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

This may be a symptom of a ground strap that’s starting to fail. The glow plug circuit has a pretty heavy current draw and when my engine to chassis strap went the codes for the glow plug circuit were among the major error codes that scanned at the time. Do you get any other codes that point to low voltage or low pressure in other systems?
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Old 11-23-2019, 07:38 PM   #5
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

If you didn't buy a newer model self reset GP controller, as suggested an existing problem could take out a fuse.

Have you checked all of the glow plugs? There have been reports that the DTC's are not always accurate as to a specific cylinder being the problem.

My preference is the Doktor A fused test lead vs using an ohmmeter to check glow plug condition. I use a 25 or 30 amp fuse for the test lead. A bad/shorted glow plug will blow a 25 or 30 amp fuse if the probe is held too long. For a bad/shorted GP, using a 25 - 30 amp fuse vs a 20 amp gives you a split second longer to notice the heavy spark when touched and allows removal of the test probe before the fuse blows. A good GP sparks a bit when touched with the probe, but it doesn't "snap" for lack of better description. Once you know the "normal" spark it's easy to tell the difference.

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Last edited by Aqua Puttana; 11-23-2019 at 07:45 PM.
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Old 11-23-2019, 07:54 PM   #6
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

I believe I have a newer no-fuse controller and I've bought a brand new controller as well, so I would doubt it's a fuse. Also the problem is sometimes intermittent, like I've started and driven the car a few times before it came back. I've guessing a blown fuse would always cause errors consistently?

Can the "circuit open" error be given when the circuit is actually shorted not open? That's why I have not done the Doctor A test yet, specially after trying both the old and a new glow plug. But I will likely try it as I'm running out of other ideas.

To test for a wrong plug number reporting I've disconnected the first plug wire and started the engine a few times - I've been getting exactly the same errors pointing to #1, so I'm guessing the reporting is correct.

I'm not getting any other errors or any other malfunctions.

I'm going to check the grounding as well. Thanks for the responses so far...
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Old 11-23-2019, 07:58 PM   #7
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

Quote:
Originally Posted by Aqua Puttana View Post

Have you checked all of the glow plugs? There have been reports that the DTC's are not always accurate as to a specific cylinder being the problem.

vic
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.

Suggest you follow Vik's advcie and test each and every GP with a fused wire.

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Old 11-23-2019, 08:03 PM   #8
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

If you run out of ideas after all these tests, you might try testing all wires involved while moving the harness, looking for an intermittent faulty wire

I replaced my entire engine harness after finding a faulty injector wire by accident. Wire was broken inside the insulation, but by pushing on it, the connection was made and engine smoothed out. By the time I found it, I was getting codes for 3 injectors (and about 40 others) I chose to buy a new harness, because I use van for work and other wires probably weren't far behind.

It's the glowplugs so DON'T buy a new harness. DO wiggle the wires with a multimeter attached, if nothing else proves to be a solution. Wires can look fine but break inside the insulation

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Old 11-23-2019, 08:12 PM   #9
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

Ground is very solid (it's a southern rust free van never in salt/snow) but I've also sprayed ground and battery connectors with DeoxIT to soak them for cleaning and will see...

Another thought - strapping a spare good glow plug with visegrips to the block/good ground, connecting with the same connectors and seeing if it heats up ok and/or throws an error - has anyone tried that or has any comments about such apprach?
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Old 11-23-2019, 08:16 PM   #10
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Default Re: Glow plug circuit open P0671 running out of ideas :-(

Besides the obvious safety concerns:). That would definitely show you if it worked or not. Make sure it can't fall on anything important if it moves when heated up

Let us know :)

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