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TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

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Old June 3rd, 2017, 19:29   #1711
sharpfork
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Join Date: Mar 2016
Location: Denver
TDI(s): 2001 Jetta
Default is 9.6v at all 4 GPs = good relay or no?

I'm still a bit confused. I have 9.6v at all 4 connections of the glowplug harness.
reading this in the initial post:
Quote:
You should get around 12V at each finger of the harness...
If you do not get 12V at any time, then your relay is not completing the circuit and needs to be replaced.
I don't have 12v, I have 9.6. Do I need to replace the relay?

Thanks!

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Old June 3rd, 2017, 19:31   #1712
sharpfork
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TDI(s): 2001 Jetta
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Originally Posted by UhOh View Post
Somewhere in this thread I think I posted a "magic" fix that I have used...
Thanks for this. I'm still trying to figure out what 9.6v a all 4 point in my harness means:
* good relay?
* bad relay?

If my relay is good, I might try your magic trick or just replace the harness.
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Old June 6th, 2017, 16:23   #1713
JohnWilder
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I don't know why. I disconnected the control circuitry to the glow plugs and it trigger a CEL immediately. The other cable simply supplies the current to heat the plugs. Apparently the system doesn't know if they are working or not. It is my understanding that the circuitry checks for resistance or the balance of resistance between the plugs. I really don't know but it works on my 2003 Jetta ALH.
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Old June 8th, 2017, 13:12   #1714
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Quote:
Originally Posted by sharpfork View Post
Thanks for this. I'm still trying to figure out what 9.6v a all 4 point in my harness means:
* good relay?
* bad relay?

If my relay is good, I might try your magic trick or just replace the harness.
My "fix" has to do with making a better connection from the harness to the glowplugs. If you're reading low voltage at the harness then you need to check/fix up-stream. Also, be sure to check promptly after switching on the ignition (and assuming temps are low enough to call for GP heating): I think you can catch the voltage w/o it being cold enough, but it takes two people to test- one to switch on the ignition and the other to check the voltage at the harness.
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Old June 22nd, 2017, 23:17   #1715
sharpfork
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Quote:
Originally Posted by UhOh View Post
If you're reading low voltage at the harness then you need to check/fix up-stream.
Does that mean the relay or the hardness itself?

Quote:
Originally Posted by UhOh View Post
Also, be sure to check promptly after switching on the ignition (and assuming temps are low enough to call for GP heating): I think you can catch the voltage w/o it being cold enough, but it takes two people to test- one to switch on the ignition and the other to check the voltage at the harness.
I pulled temp sensor, doesn't that buy me more time?
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Old June 25th, 2017, 14:16   #1716
sharpfork
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Originally Posted by sharpfork View Post
Does that mean the relay or the hardness itself?
I pulled temp sensor, doesn't that buy me more time?

I don't have a clear view around the cause of the low voltage I'm seeing so I ordered both the harness and the relay replacement parts. I'll try replacing the relay first and see if that fixes it, if not, I'll splice in the harness. Thanks for all the help.
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Old July 10th, 2017, 08:14   #1717
sharpfork
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Originally Posted by sharpfork View Post
I don't have a clear view around the cause of the low voltage I'm seeing so I ordered both the harness and the relay replacement parts. I'll try replacing the relay first and see if that fixes it, if not, I'll splice in the harness. Thanks for all the help.
It was the relay!
I now have new glow plugs and a new harness too but oh well. Getting up under the drivers side dash in my 2001 jetta was a bit of a pain but mostly because it was much further under the dash near the floor than I expected. once I removed the torx screws and got the panel open, swapping the parts was easy.

Thanks again, I can now get my emissions tested!
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Old July 21st, 2017, 12:42   #1718
hdupriest2
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can I drive my vw diesel with glow plug & malfunction light on if it is cranking up fine. Can not take in to fix for a couple of days.
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Old July 21st, 2017, 13:50   #1719
BobnOH
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Originally Posted by hdupriest2 View Post
can I drive my vw diesel with glow plug & malfunction light on if it is cranking up fine. Can not take in to fix for a couple of days.
If it's just glow plugs illuminating the CEL, you can drive it forever. You should fix the glow plug issue.
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Old September 13th, 2017, 16:02   #1720
Deep Fried
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wow, this is a long thread... I read the OP but what I am specifically looking for is a lead to the best price for a replacement harness for my 2001 TDI Golf... I know it's bad cuz when I went to remove the harness from each plug to put a probe on it to test each plug the harness material literally broke up and cracked. I first thought the piece from the long lateral body at the 90 degree turn down to the plug was "removable" since 3 out of 4 came out and left the body of the harness still on the plug and exposing the metal connection from the harness! Anyway, I need another one... where can I find the best online source (lowest price) to replace the harness. I also guess cuz it's an '01 I need the two wire harness? thanks!
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Old September 14th, 2017, 20:50   #1721
volmaniac
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Hey Deep Fried! Check this out.

http://www.theartofdiesel.com/80-glo...not-on-my-tdi/
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Old December 18th, 2017, 11:35   #1722
sjurea
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I wonder if I bought a car with no GP-relay.
The car starts fine in summer, but has to do about two bouts of 5-second churning now in the Norwegian winter. When it starts, it skips a lot of beats for ten seconds or so, until the motor control unit raises the rpm to 1600-1700, making it go smoother. A minute or two later, it runs normally. The glow plugs are all about 0.9 Ohms. There is no voltage on the harness when glowing (measured most distal finger). There seems to be no relay in the number 10-spot; see the included picture.

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Old December 18th, 2017, 15:35   #1723
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Old December 19th, 2017, 10:29   #1724
ymz
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Your car probably has a solid-state controller instead of a relay... thise usually sit under the cowling beneath the windshield... next to the windshield wiper mechanism... on the left side...

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