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Weaver
Member Since: 19 Nov 2011
Location: Dumfries
Posts: 6
  
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| Battery & Engine Management Light while towing |
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Hi guys, recently bought a 57 plate disco 3. While towing a boat / trailer approx. 2 tonne down to Windermere for service, everything went fine to begin with but after about 20 miles the engine hesitated with battery warning and engine management light flashing on. Unable to stop at the time this carried on for a few miles then cleared. Road at the time was level and no undue load on the engine. Return journey without load no issues, took car to dealer and no fault codes showing. On collecting the boat a week later same fault appeared, again when on level motorway not while pulling under load but this time more pronounced and contined for rest of journey. Found fault occuring around 2,000 rpm, if I accelerated engine ran smooth making me think it could be throttle position related. Car now back at the garage. Any thoughts on likely cause.
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 Thu Jan 19 2012 1:33pm |
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Weaver
Member Since: 19 Nov 2011
Location: Dumfries
Posts: 6
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Hi Mickey - Nope, standard lights and the fault was only happening around the 2,000 rpm, lift the revs and the fault cleared, but there's only so fast you want to haul a boat.
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| Thu Jan 19 2012 4:56pm |
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Nasher
Member Since: 07 Mar 2009
Location: North of Pompey - UK
Posts: 618
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I had a similar issue towing my boat(On it's trailer  ) although in my case I was getting a special programmes not avaialble message.
As it happened three times, and only with the trailer board plugged in, I stripped the light units on the board down and cleaned all the contacts etc, and it's been fine ever since.
I suspect there was a short circuit that I sorted out with the service, and knowing all the issues surrounding brake light bulbs and odd system errors on D3 I suspect it may have been the brake light circuit on the board that was at fault.
Another thought, and this may create more discussion than you expect, has the car been told you have a towbar fitted? ie the box ticked in the set-up screen.
Not sure if it would make a difference, but if the ECU couldn't understand the running conditions it was seeing because it didn't know a lightboard was plugged in and there could be extra weight to be pulled, it may have assumed a running error.
Nasher. Heaven doesn't want me, and hell is afraid I'll take over.
55plate D3 HSE in Silver.
Ocean 6.5m RIB with DT200EFI Suzi Wong.
Bombard Aerotec 380 SIB with 9.9HP Suzi for the Smaller Nashers.
Kawasaki Z1000H, Big Bore, monoshock, Upside down front end etc.
1940's military Canoe - Currently loaned to the National Maritime Museum in Falmouth.
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| Thu Jan 19 2012 8:53pm |
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Frans@yamorna
Member Since: 20 Jan 2010
Location: Tzaneen
Posts: 97
 
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Hi,
The D3 is very sensitive for faulty electrics on the vehicle you are towing.It produces all sorts of problems if your tow-electrics is not up to standard.If it happens again,stop,switch off and unplug the towplug.This is illegal but you should be able to continue your journey.Have the boat electrics checked!! Big Country RR,NL Split Charge,FR Sump Guard,TP Monitor,BAS map
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| Thu Jan 19 2012 9:13pm |
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character
Member Since: 01 Jan 2008
Location: wiltshire
Posts: 4184
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an obvious one, is the tow bar/electrics LROEM or aftermarket?
have you or someone changed the original 7 pin to a euro 13 pin since it was fitted if it did have a OEM LR
if the latter, recon its been wired up wrong, if an aftermarket set up then I recon as has been said, yer LR does not know its towing, I assume you have the trailer symbol on the dash when you indicate as well as the normal green indicator symbol, if not then there is yer issues 
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| Thu Jan 19 2012 11:35pm |
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Weaver
Member Since: 19 Nov 2011
Location: Dumfries
Posts: 6
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Thanks for the input guys, interesting line of thought that I'd have never have reached on my own. I recently hauled our caravan without a problem which lends weight to the theory of faulty trailer electrics. Will be easily tested. I'll let you know how I get on.
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| Fri Jan 20 2012 7:38am |
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Weaver
Member Since: 19 Nov 2011
Location: Dumfries
Posts: 6
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Update- Afraid we can discount the trailer electrics, on a recent run to Aberdeen same symtoms but not towing this time. Managed to capture a short video clip of the dash showing the fault (You Tube - Search Terregles123). As mentioned in an earlier post this is an intermittent fault and you can accelerate through the problem which only seems to happen with the engine running around 2000 rmp. Wondered if the throttle position is relevant, does the management system call on any changes to the engine set up at this point, also concerned about the possibility of fuel carry over and subsequent damage to the catalytic converter. All thought / theories appreciated.
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| Sun Feb 12 2012 11:14am |
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