Coil light flashing !!! Witts end |
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T5 surfer
Not Quite Newbie Joined: 08 Aug 18 Status: Offline Points: 14 |
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Posted: 08 Aug 18 at 17:17 |
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Hi guys
Newbie here hope someone can help T5.1 2013 102 Long story short... Coil light flashing so fit new egr valve Coil still flashing.. open circuit in water pump. Changed both water pumps genuine Coil now still flashing limp mode Coil flashes during start up 80% of the time but if i put ignition off while driving and jump start it the coil ligjt will go off. Also noticed that sometimes the vacum to the egr diagraphram is sometimes up and this gives the coil light flash Agsin sometimes it will be in the right state and it will still give coil light flash During coil light flash it will always be limp mode till i put ignition off and bump start it. Van has a celtic remap and has been fine for about 18months Any help greatly appreceated as i really am going to throw the towel in... |
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T5 TDI
Vanorak Joined: 05 Nov 05 Status: Offline Points: 3687 |
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Hi T5, It's all getting a bit muddled. Do you have access to VCDS? If so, clear any codes you have (save them somewhere first). Then drive the van until the coil light is flashing again. Using VCDS go to 'Autoscan' and it will look through all the various systems on the van for faults. This will take a few minutes. Save the scan results and post them here.
I'm not familiar with the 2.0 CR engines but perhaps you have a fault with the vacuum pump or a split vacuum pipe or even wrongly connected pipes to the new EGR valve. Did you use a genuine EGR valve?
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2004 2.5 174
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T5 surfer
Not Quite Newbie Joined: 08 Aug 18 Status: Offline Points: 14 |
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Thanks for the reply
Just been on the vcds now and its again showing coolant pump 2 open circuit fault. Ive had a new pump fitted genuine vw and also had the wiring checked and that was ok. Im thinking maybe its a relay fault. Where is the coolant pump 2 relay? Anyone know? |
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T5 TDI
Vanorak Joined: 05 Nov 05 Status: Offline Points: 3687 |
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I've read a post by Matertech where he says the wiring can chafe and short near the starter motor. Have a really close look at the loom especially if it is touching the starter. Sometimes just a small rub mark on the outside of a loom is all it takes for a short. Your code says 'open circuit' not 'short' but that can be caused if the fuse blows as the result of a short, so check all of the fuses, including under the bonnet by the battery where you should also find the relay (if it has one).
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2004 2.5 174
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T5 surfer
Not Quite Newbie Joined: 08 Aug 18 Status: Offline Points: 14 |
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Ive had all the wiring checked and all is ok, the mechanic knew about the wiring chaffing over the starter so checked it all they way back to the ecu.
The fuse is ok and i ran the coolant pump under vcds and it ran with no problems The fault is intermittent that makes it really hard to find Im thinking now if there is a rellay somewhere for it? |
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T5 TDI
Vanorak Joined: 05 Nov 05 Status: Offline Points: 3687 |
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If there is a relay it should be under the fuse box under the bonnet. Have you seen this? https://www.vwt4forum.co.uk/showthread.php?t=1514081
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2004 2.5 174
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T5 surfer
Not Quite Newbie Joined: 08 Aug 18 Status: Offline Points: 14 |
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Yes had a good read through that post and checked my wires
But i think would be a good idea to check them again |
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AndyT
Moderator Group Joined: 16 May 08 Location: Ammanford Status: Offline Points: 2274 |
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If there are no performance issues, just pull the bulb. That way you can take all the time you need to diagnose.
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LT28 1979 2.0 Pampas Nevada Camper LPG 93K, 1980 T3 A/C Camper 98K,1994 RRC 3.9 LPG 120k , 1998 Audi A6 Est 2.5 V6 diesel 127k
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gregozedobe
Vanorak Joined: 22 Dec 06 Location: Canberra, Oz Status: Offline Points: -998266 |
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Here's a completely left field suggestion:
Could it be your brake light switch ? These are a common problem with VWs and can cause lots of weird errors. Check your brake lights come on when they should and go off when they should. If in doubt, replace (IIRC They are not very expensive).
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T5 TDI
Vanorak Joined: 05 Nov 05 Status: Offline Points: 3687 |
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If you have VCDS you can check the brake light switch in the engine controller by going to measuring blocks (live data) and looking at the cruise control functions. You should find the brake pedal monitoring there.
Andy- You can't pull a dash bulb these days- All soldered in LEDs! That won't cure the limp home, only fixing the fault will do that.
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2004 2.5 174
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T5 surfer
Not Quite Newbie Joined: 08 Aug 18 Status: Offline Points: 14 |
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Thanks for the help guys
Ive plugged in vcds and its still the same fault, Coolant pump 2 open circuit. Ive checked brake lights all work ok Anyone know where the relay is for the coolant pump 2 |
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T5 TDI
Vanorak Joined: 05 Nov 05 Status: Offline Points: 3687 |
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2004 2.5 174
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AndyT
Moderator Group Joined: 16 May 08 Location: Ammanford Status: Offline Points: 2274 |
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Is this any good?. Relays are 7.2 and 8.1 at the bottom if you can't read the text. 7.2 Additional coolant pump relay -J496- (449) 8.1 Coolant shut-off valve relay -J541- (449) Edited by AndyT - 10 Aug 18 at 13:25 |
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LT28 1979 2.0 Pampas Nevada Camper LPG 93K, 1980 T3 A/C Camper 98K,1994 RRC 3.9 LPG 120k , 1998 Audi A6 Est 2.5 V6 diesel 127k
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T5 surfer
Not Quite Newbie Joined: 08 Aug 18 Status: Offline Points: 14 |
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Hi matey
that's absolutely perfect just what I was looking for im unable to zoom on the picture though have you got a larger image I cant quite make it out, are they in the engine bay under the battery?
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AndyT
Moderator Group Joined: 16 May 08 Location: Ammanford Status: Offline Points: 2274 |
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Just says in the engine bay. Had to shrink the image to be able to post it and didn't keep the original, but.... If you find the plate with the vin, engine & gearbox codes, take a pic and email me (in profile). I can then do an exact search in elsawin, and send the results back to you.
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LT28 1979 2.0 Pampas Nevada Camper LPG 93K, 1980 T3 A/C Camper 98K,1994 RRC 3.9 LPG 120k , 1998 Audi A6 Est 2.5 V6 diesel 127k
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T5 TDI
Vanorak Joined: 05 Nov 05 Status: Offline Points: 3687 |
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Yes I think they are in the E-box under the battery.
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2004 2.5 174
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Paul18765
Not Quite Newbie Joined: 14 Jun 19 Location: Middlebrough Status: Offline Points: 10 |
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Hi, did you ever get to the bottom of this, I’ve got exactly the same problem.
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gregozedobe
Vanorak Joined: 22 Dec 06 Location: Canberra, Oz Status: Offline Points: -998266 |
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Could be a DPF problem ? T5 surfer hasn't been on here for ages, so I don't think you'll get a reply from them:
Edited by gregozedobe - 15 Jun 19 at 02:28 |
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Paul18765
Not Quite Newbie Joined: 14 Jun 19 Location: Middlebrough Status: Offline Points: 10 |
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Wouldn’t that be shown with the dpf warning light? Why would the coolant pump error code show?
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gregozedobe
Vanorak Joined: 22 Dec 06 Location: Canberra, Oz Status: Offline Points: -998266 |
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A friend ran over a wombat which took out a DPF sensor, he tells me the "coil light" came on (and limp mode if he's remembering correctly - it was a few years ago).
VW's can show all sorts of weird (and un-related) error codes when things go wrong. Worst is if the voltage regulator allows too high a voltage, everything goes crazy. Diagnosing vehicle problems on-line is a very imprecise science, and even more so when you are getting free advice from random internet denizens .....
Edited by gregozedobe - 15 Jun 19 at 12:24 |
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