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: 26 Jul 19 at 23:08 |
where are the coolant temp sensors on the t5.1 2013 102bhp?
I think i will change them to be sure Today i stripped all the wiring but found no damage, also did a continuity test all ok So i guess ill try the sensors
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T5 TDI
Vanorak Joined: 05 Nov 05 Status: Offline Points: 3687 |
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You could definitely do with being sure about the coolant temp sensor. That won't be a genuine reading because the engine would be boiling but it could be that the coolant sensor is failing and sending the wrong value to the ECU. However normally a value that high would cause a code. The other possibility is that the scanners are mis-labelled and that reading is for another temp (exhaust gas maybe). Although it seems odd if you have tried two different scanners.
You ought to get to the bottom of that before you go much further. If you can find someone with genuine version of VCDS it would be easier, it is very reliable. The sensor you are looking for is called the G62 coolant sensor. There may be more than 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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good point about the. Egr
And i do believe the pump feeds the egr valve cooler also. This is what came up on my faults first so i replaced the egr valve and had it coded in so thats all good hopefully. Now i was thinking as you do... So the fault only comes up during start up So im im thing that when you switch off the pump is meant to come on to cool, now i think the fault is that the pump isnt kicking in, So when i start the engine again it throws up the coil light as the pump didnt start on last start up. Pump does work though if i use vagcom to switch it on Another thing i have found is when using the torque app or car scanner pro app. This is reading my coolant temp and its shockingly high 120 degC to 147 degC But no warning lights on dash and no temp gauge either. My mechanic asked which coolant sensor was ir reading but i had no idea. So looks like the temp is high, the pump should cut in but isnt The pump should cut in when i switch off but isnt And this maybe whats giving me the coil light. I want to check the wiring from pump to the ecu but how do i gain access, i cant see much from underneath 🤔
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Paul18765
Not Quite Newbie Joined: 14 Jun 19 Location: Middlebrough Status: Offline Points: 10 |
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Thanks I will.
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T5 TDI
Vanorak Joined: 05 Nov 05 Status: Offline Points: 3687 |
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Have a good journey! I was thinking of doing a big European trip with mine last month, but some recent serious health issues have put that on the back burner for now. I'm quite glad now I didn't go because I would have ended up in French hospital in a big heat wave.
You could try making a few VCDS logs while you are a captive in the cab. If the limp home happens while it's hooked up you might be able to work out the cause. If you do fancy having a go, make sure to get EGR, boost, RPM, and throttle opening (load shown in percent) logged together.
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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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Thanks again, yes will do. I’m driving home in a couple of days, Dubrovnik to uk, about 1200 miles, over 4 days, we’ll see what happens, I’ll do a bit more work on it , if/when I get it home. I’ll keep you posted.
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T5 TDI
Vanorak Joined: 05 Nov 05 Status: Offline Points: 3687 |
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It certainly is an odd one. (Or two since you both have similar problems) I wouldn't have thought that any genuine fault with the secondary coolant pump would have led to a engine management light being on. Half of the pumps on older model vans have fallen to bits long ago and aren't working. The first thing most people know is when they notice coolant drips underneath or someone else working on the van spots corroded wires hanging down.
I haven't had much to do with the new model but I know EGR problems have been very common. I wonder if the secondary coolant pump feeds the EGR cooler on the CR engined models. From pics I have seen online, the electrical part of the EGR valve gets badly corroded with these EGR failures and this could lead to the EML light coming on and limp home if the ECU gets mixed messages from the corroded wiring. If you haven't already had a new EGR valve, read all the (endless!) threads on them via google and be sure yours is working properly. |
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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, a very good point indeed, not just a simple on off circuit then, i will refrain from any wiring modifications.
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T5 TDI
Vanorak Joined: 05 Nov 05 Status: Offline Points: 3687 |
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I'm with Paul except for that I know my pump can run when the engine is running. The reason I know this is that in around '05, a Workshop Campaign was issued for for customers who complained of noisy secondary coolant pumps. The fix was fairly basic, just a small rubber strip to isolate the pump from the body. I never bothered with mine because I quite like to know it if it comes on. I have only ever heard it come on briefly on very hot days, in traffic, when maybe a little extra cooling is needed.
I wouldn't add current to any part of the pump whilst it's connected unless you have a wiring diagram. If you make a mistake you could wreck the ECU. Bear in mind that sometimes the ECU provides an earth rather than a live feed to switch a component and that the pump may have a ignition switched 12v supply too and/or even a 5v reference voltage which is another reason to be very careful probing/shorting/powering anything without being absolutely certain what it is. The ECU is under the battery by the E-box (which is a big junction of connectors) you might have to take the E-box lid off, I can't remember. Mine is an '04 so the design might change over the years.
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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, the pump is not wired to run permanently, it’ll run when the ecu calls for it only, usually when it’s really hot and the engine is turned off.
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T5 surfer
Not Quite Newbie Joined: 08 Aug 18 Status: Offline Points: 14 |
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im beggining to winder now if this is anything to do with my remap?
I would like to know if the pump is on permanent as i could add another live to it, just to prove the pump is working and rule out any connection problems. How do i gain access to the ecu? And to the wiring of the pump over the starter motor?
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Paul18765
Not Quite Newbie Joined: 14 Jun 19 Location: Middlebrough Status: Offline Points: 10 |
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That’s what I though, however I followed the guys instructions and sure enough, it worked..... at least for a few hundred miles. It’s since poppped up a couple of times, immediately gone off and not reappeared for another coupe of hundred miles. I’m currently in Slovenia, having driven from Rotterdam, not a single flash...... again, fingers crossed.
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T5 TDI
Vanorak Joined: 05 Nov 05 Status: Offline Points: 3687 |
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That's odd. Normally pulling wires off things causes an open circuit code. It should come straight back if you clear it with the wires off.
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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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Ah ok, mine was a pierburg but still had faults and i changed it to a genuine vw one and im still getting the fault open circuit.
So if i dissconect, clear faults and reconnect that should work Ill try that
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Paul18765
Not Quite Newbie Joined: 14 Jun 19 Location: Middlebrough Status: Offline Points: 10 |
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Hi All, thanks for the replies, just a quick update. May have cured it..... after talking to a few mechanics I was advised to ditch the after market pump and replace it with a genuine VW one, leave it disconnected, clear the fault code and reconnect. Done all that and haven’t seen a warning light since!!!!
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T5 surfer
Not Quite Newbie Joined: 08 Aug 18 Status: Offline Points: 14 |
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Does the pump run all the time?
Thinking of running another supply to the oump to see if that cures the fault.
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gregozedobe
Vanorak Joined: 22 Dec 06 Location: Canberra, Oz Status: Offline Points: -998266 |
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I hate intermittent problems, they're such a pain to diagnose and fix :(
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T5 surfer
Not Quite Newbie Joined: 08 Aug 18 Status: Offline Points: 14 |
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Hi guys im sorry for not getting back sooner
Been without the t5 for a while But back in it now and problem still persists So same as before but a bit more info Van goes into limp mode while driving Only comes on during starting the van intermittent Resets if i jump start in van while driving. Ie ignition off, ignition on and lift clutch in gear. Also after 3 times the eml comes on but will reset on the 3rd trio of driving then fault wont come until maybe a few weeks again its its intermittent. Never happens while driving only strarting. |
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T5 TDI
Vanorak Joined: 05 Nov 05 Status: Offline Points: 3687 |
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Fingers crossed then!
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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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Thanks for the reply. I’ve been having another go today. I’ve checked the loom, again, all good, checked the connections and wiring through to the ecu, all good. Ran vcds again, cleared the fault code, test ran the pump through vcds, confirmed it works, again, all good. No “new” warning as yet. Just a bit concerned that I haven’t actually found a problem as yet.
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