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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 December 29th, 2004, 16:35   #46
savis01
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Default Re: Glow plugs 101 ***Ver. 2.0***

Wow, I have fixed my car I ended up changing my glow plugs(re-checked the ohm's) and auto zone cleared my fault for free everything is working. Next step timing belt.

Thanks
Steven Saville
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Old December 30th, 2004, 09:39   #47
DVDVW
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Default Re: Glow plugs 101 ***Ver. 2.0***

When you will check your glow plugs, put dielectric grease on them. Since I made that, no more starting problem. The car start fine at -25C, like last year!
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Old December 30th, 2004, 13:39   #48
Paul_L_Fisher
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Default Glow plugs 101 ***Ver. 2.0***

OK. I have P0380 as my code and a flashing GP light and I have a 2000 Golf. I have tested all 7 GP's and they all read 0.5 ohm. I have read the voltage at the 4 engine GP after diconnecting the ECT and they all read what the battery says. When I read the voltage at the coolant GP's, I cannot get a reading. What needs to be done to turn them on? The Bentley wiring diagram shows that there should be 2 relays #53 (J359
Pictures from Bentley CD

and J360

) that control the coolant GP's. Looking, I only have one #53 and a #100
Picture from my car


I am willing to replace the GP harness, however am concerned why my coolant GP's don't show voltage.
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Old December 30th, 2004, 15:07   #49
MOGolf
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Default Re: Glow plugs 101 ***Ver. 2.0***

The P380 is related to the engine GPs, not the coolant GPs. Stop worrying about them. If the engine GPs are fine, the next step would be replacement of the harness because of oxidation at the contacts. Or just clear the code and see if it comes back.

The flashing GP light is not related to the GPs. Check the operation of your brake lights. If you have burned out bulbs, replace them. If the bulbs are good but the light don't operate, then the switch is probably bad. (Covered in numerous threads).

I suggest meeting up with someone with VAG-COM to get a proper diagnosis.

Those coolant GPs are activated by the ECM based on the coolant temp during the initial warm up. Relay 100 is used to power 2 of the 3 GPs and the 53 is used to power 1 of GPs.
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Old December 30th, 2004, 19:51   #50
Paul_L_Fisher
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Default Re: Glow plugs 101 ***Ver. 2.0***

I guess that is what I wanted to make sure of (no monitoring of coolant GP's). I'll put everything back together with some dielectric grease, get the code cleared and see it it goes away.

The brake lights go on every time I have checked them. Is there 2 brake switches? On my Taurus, there was one that did the lights and one that did the cruise. Is the Golf the same?

As for the relay mixup, the Bentley cleary states on the wiring diagram that there are 2 #53's. Is it a SNAFU from Bentley or is my car 'special'?
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Old December 30th, 2004, 20:17   #51
MOGolf
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Default Re: Glow plugs 101 ***Ver. 2.0***

Brake light switch has both of the switches you mention in one package. Jettas and NBs got recalled for the switch going bad, but not Golfs.

Your car's got the higher current capable relay. This relay 100 is also used as the 'load reduction' relay behind the instrument panel. The Bentley is not 100% accurate, and parts are 'subject to change without notice'.
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Old December 30th, 2004, 21:40   #52
cwaglytdi
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Default Re: Glow plugs 101 ***Ver. 2.0***

Hi Everyone,

Merry Belated Christmas and a Happy New year!!!

Question: I have a 2001 Jetti TDI and it has about 103,000 km's on it. I just had to replace a glowplug as it "quit" on me. How often should glowplugs last and/or when should they be changed?

Thanks
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Old December 31st, 2004, 00:17   #53
doc_m
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Default Re: Glow plugs 101 ***Ver. 2.0***

wingnut thanks for your awesome posts, in the how to's link I put a pdf if it's easier for people to print it off, next is the starter cleaning as mine is sounding kinda funny but just noticed a little cleaning and i will be happily on my way
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Old December 31st, 2004, 06:39   #54
Paul_L_Fisher
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Default Re: Glow plugs 101 ***Ver. 2.0***

So it is possible that one 'side' of the switch is bad and the side that actually does the lights is still working. Should I order the Jetta recall switch or should I just go to VW and get whatever they say?
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Old January 17th, 2005, 09:05   #55
spoilsport
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Default Re: Glow plugs 101 ***Ver. 2.0***

is there anyway we can get the pics back up ?
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Old January 18th, 2005, 09:18   #56
Noplugs
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Default Re: Glow plugs 101 ***Ver. 2.0***

Glow plug are not a time change item. Their life span depends on their use. If you live in the south where they come on for short warm-up period, they should last years, I lived in Florida for the first 4 years of my N/B. I replace them on its 3rd year and used the original harness. Now that I live up north I exspect that to be reduced...How much you ask. Well I have no clue but if I was to guess I think it would be reduced by 25-50%. So my advice is dont worry about them unless your losing sleep.
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Old February 2nd, 2005, 06:11   #57
Goldie
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Default Re: Glow plugs 101 ***Ver. 2.0***

Thanks for all of the great information on this thread. I am having a bit of problem that I'm hoping someone can help me with. I am a neophyte with electronics so bare with me.

I don't think that my 1996 Passat is starting with the help of glowplugs. I have to crank for about 20 seconds which is accompanied by lots of white smoke. I drive the thing before bed - it seems to help in the morning. It's been cold here, luckily for the starter.

I am getting a check engine light sometimes, but I haven't been able to download the codes yet. It's happening inadvertently. Another way to say that is that I can't figure out what is causing it. Sometimes it happens right after the glow plugs cycle, sometimes after I start driving and get it into 2nd. Sometimes I can turn off the car and start it again and the light won't come on.

I'm assuming that the light has something to do with the glowplugs.

I got a multimeter and I've tried it out but I don't think I am using it correctly or I got the wrong meter or the plugs are shot. I set the function switch on the meter to measure resistance. There are settings for 2, 20, 200, and 200 ohms. I tried it at all 4. When the meter is on and not connected to anything, the readout says "1." I assume that is infinity? When I touch the + to the - leads the readout drops to ".000"

But when I brought the meter out to the car and touched the + to a plug and the - to a selection of possible grounds, the readout didn't change ("1.") Am I doing something wrong? Or are all of my plugs shot? They look to be in good condition - no oxidation.

Thanks!

Jared
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Old March 1st, 2005, 20:21   #58
pismosisks
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Default Re: Glow plugs 101 ***Ver. 2.0***

Many many thanks Wingnut!

Our check engine light popped on yesterday, and the ODB scanner I borrowed from the local parts store gave me a code for a failed glow plug #2. I did a search on this site and found your post. Popped the engine cover off for the first time on my own (all previous service by dealer), and dived in. With your instructions, I was able to verify the bad plug in about two minutes. Its resistance was off the scale, but the other three were 0.8 - 0.9 ohms, right in the range you said. The local parts store has one in stock, so I hope to pick it up on the way home from work and swap it out tomorrow night.

Again, many thanks for such detailed and accurate instructions.
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Old March 3rd, 2005, 11:00   #59
Bill_Blazek
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Default Re: Glow plugs 101 ***Ver. 2.0***

Jared,

If your car was generating a glow plug DTC, diagnostic trouble code,
usually P0380 or similar if its for a specific plug for the newer models,
the CEL would come on shortly after starting - within ~30seconds - 1 minute,
and would stay on all the time as long as it was running.
Once it generates the DTC,
this will happen everytime you start the car until you
fix the problem and use an OBDII scan tool to clear it.

So if your CEL is not staying on all the time, its not glow plugs.
Use an OBDII scan tool or VAG-COM to findout if you have any DTCs.
Many auto parts stores are now letting people use one to read and clear the DTCs.
Or better yet, find someone with VAG-COM to get the codes.

It sounds like your testing the plugs correctly.
I use the lowest setting you have.
Mine generates a steady beep on this lowest setting when it measures a current.
If you use too high of a setting,
the resistance may be so low it does not register.
When you test it, touch the + to the tip of the plug and
the - to the block somewhere close to the plug.

Also test the harness itself as described in the original posting.

Good luck
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Old March 3rd, 2005, 12:18   #60
Goldie
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Default Re: Glow plugs 101 ***Ver. 2.0***

Thanks for your reply Bill.

I changed the plugs and she seems to be starting fine. The CEL is still coming on as you described, seconds after cycling the plugs/starting. It stays on all of the time. I gave up on checking the resistance, but now that things are working alright, I'll get back out there just for the lesson.

Best,

Jared
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