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Glow plugs not getting any electricity
Posted: Sun Jul 02, 2017 5:51 pm
by alin_999
Hi guys!
Yesterday I thought I should replace the glow plugs as they seemed to be the problem for the difficult start in cold weather.
After I took them out from the engine and tried them with the ignition on I noticed that none were working, tried the same thing with the replacements same answer. Checked the wires with a multimeter, no voltage. The wires do not look damaged.
Any idea why there is no current coming to the glow plug wires?
Re: Glow plugs not getting any electricity
Posted: Sun Jul 02, 2017 10:52 pm
by alexperkins
Glow plugs only work below a certain temperature. They’ll only come on when it’s less than 5C I think
Re: Glow plugs not getting any electricity
Posted: Wed Jul 05, 2017 11:38 am
by alin_999
Ok, decided to take it to service, the guys checked the car, 2 glow plugs dead, need to replace.
The wiring was good it seems just didn't check them the right way.
The mechanic told me I should also replace a certain relay, responsable for the glow plugs. Is it the 109 relay ?
Re: Glow plugs not getting any electricity
Posted: Wed Jul 05, 2017 11:41 am
by alexperkins
109 is the ECU/ECM relay
100 is the glow plug relay
If your 109 relay is original, its worth replacing it also as there is a known fault with these relays.
Re: Glow plugs not getting any electricity
Posted: Wed Jul 05, 2017 1:02 pm
by alin_999
I've read that the black version of the 109 relay has issues. My car has the grey one. Are there known issues with this one also?
Re: Glow plugs not getting any electricity
Posted: Wed Jul 05, 2017 1:03 pm
by alexperkins
Some of the earlier grey 109s are also faulty
My 2006 1.4 TDI had a grey 109, and that failed making cold starts very difficult.
Re: Glow plugs not getting any electricity
Posted: Wed Jul 05, 2017 2:01 pm
by alin_999
Ok, thanks for the tip.
Buying one from ebay would be ok, or should I search for those only at VW official dealers?
Re: Glow plugs not getting any electricity
Posted: Wed Jul 05, 2017 2:04 pm
by alexperkins
Needs to be a decent quality one so Febi, Meyle or original
Re: Glow plugs not getting any electricity
Posted: Thu Jul 06, 2017 5:49 pm
by alin_999
I purchased the 109 relay from ebay, original product.
Can't seem to find the 100 relay though anywhere on the web
A link would be highly appreciated.
Re: Glow plugs not getting any electricity
Posted: Thu Jul 06, 2017 10:28 pm
by alexperkins
Can you buy from eBay UK?
Re: Glow plugs not getting any electricity
Posted: Fri Jul 07, 2017 1:50 pm
by alin_999
Yes, I can.
Re: Glow plugs not getting any electricity
Posted: Fri Jul 07, 2017 3:46 pm
by alexperkins
Re: Glow plugs not getting any electricity
Posted: Fri Jul 07, 2017 4:11 pm
by alin_999
The values on the scheme from my relay are: 3 1 2 5.
On ebay, I only see relays with high values 70-80.
Do they also work?
By the way, what do these numbers stand for?
Re: Glow plugs not getting any electricity
Posted: Fri Jul 07, 2017 4:43 pm
by alexperkins
Can you send me a photo of your relay? That sounds like pin numbers.
The 70-80 is the amperage the relay is rated for as glowplugs pull alot of current.
Relay 100 is Relay 100
Re: Glow plugs not getting any electricity
Posted: Fri Jul 07, 2017 5:13 pm
by alin_999
