 | Home > Td5 > Cut outs and Temp Gauge |
 
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| davew Member Since: 02 Jan 2012 Location: North Yorkshire Posts: 888   
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The temperature gauge would suggest the ECU is powering down for some reason. Possibly something like a dodgy electrical connection/supply.
Do you have an aftermarket/additional immobiliser that might be killing the master relay ? Have you checked the loom/ECU plugs for oil ? The temperature gauge on the TD5 Defender is driven by the ECU and if you power the rest of the vehicle up without powering up the ECU the gauge goes up to max which is why I think that's probably significant. http://www.yorkshireoffroadclub.net/ |
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6th Aug 2012 11:51am |
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| Glynparry25 Member Since: 16 Feb 2009 Location: Miserable Midlands Posts: 3015  
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Similar to what Dave says- have you double checked the battery connections?..... Very simple thing but can catch people out.
Glyn   |
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6th Aug 2012 11:52am |
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6092  
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Usually caused by a bad earth on the ECU casing itself... there should be a thin black wire with a ring terminal, bolted through one of the ECU mounting bolts.
Try either cleaning this up, or for a better cure run another cable (preferably black and of a similar or slightly bigger size than the original one) straight back to the battery, or another GOOD earth point. |
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6th Aug 2012 4:47pm |
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| vulcanfreak Member Since: 05 Sep 2010 Location: suffolk Posts: 77 
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Check the connections to the impact sensor on the engine bulkhead (ruberey thing with a reset button)
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6th Aug 2012 6:04pm |
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| wslr Member Since: 18 Jul 2010 Location: Wellington, Somerset Posts: 581
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Jim's right. If the ECU can't see a reading from the coolant temp sensor, it raises up the temp gauge on the instrument pack, at which point the ECU cuts the engine as a failsafe. With the ignition on, or engine running, wiggle the wiring behind the powertrain ECU and where the loom passes out of the underseat compartment. See if the temp gauge flinches around and note what you did. I've seen the loom leaving the ECU multiplug pulled tight on some Td5's and this caused the issue. |
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6th Aug 2012 10:58pm |
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| Laurie Member Since: 22 Feb 2008 Location: Sussex, England Posts: 2897 
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Thanks guys. Looks like you're all saying basically the same thing. Will investigate and report.
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6th Aug 2012 11:24pm |
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| Laurie Member Since: 22 Feb 2008 Location: Sussex, England Posts: 2897
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Have investigated.
It would seem, that in their infinite wisdom, Land Rover decided to not alarm their customers. When you start your TD5 the temp. guage rises slowly to a preset midpoint. After that, it remains at midpoint until the coolant temp. reaches 105° when it instantly moves to the red sector of the guage and puts the engine into limp mode. I heve the XS version which includes aircon which reduces the airflow through the main radiator. I hadn't noticed that, while doing normal Land Rovery things, both radiators had become partially bloked by mud. Clearing both rads has cured the problem.  |
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9th Sep 2012 11:59pm |
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| me@td5.org Member Since: 16 Jan 2011 Location: Warwick Posts: 856 
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I have experienced this also, it seems the guage is an analogue representation of a digital scale. In mine one minute it was OK next it was in the red. After slowing down for a few mins it was OK again.
At the time I put it down to thermostat operation but as soon as I got a chance to check it I realised this was not the case. There was hardly any water in it! |
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10th Sep 2012 6:28am |
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| Laurie Member Since: 22 Feb 2008 Location: Sussex, England Posts: 2897
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My repairer took it for a fast drive with me watching his ECU reader.
The temperature on that showed a slow increase, while the guage remained at normal. |
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10th Sep 2012 9:01am |
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| TR51 Member Since: 17 Apr 2012 Location: Dorset UK Posts: 333  
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Glad you got it sorted Laurie, and good to know the cause for the future!!
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10th Sep 2012 9:06am |
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| Laurie Member Since: 22 Feb 2008 Location: Sussex, England Posts: 2897
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Cheap fix too
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10th Sep 2012 9:13am |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443 
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Guess what I'll be doing this week?....... Cleaning my rads out to at least allow air flow through them as they are pretty much 80% blocked with crud from the Plains and North Wales, some of that crud was added following you Laurie! Mine actually showed up a couple of falterings coming back on the A14 yesterday evening after keeping up a steady 60/65mph with occasional quicker bursts for overtaking. With an A bar and 2 large spots covering the front, air flow is less than a 'clean fronted' Defender but never given issue before. I have a feeling that the outside temperatures in the high 20's coupled with a fairly brisk cross wind may have been contributary factors.
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10th Sep 2012 9:22am |
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