 | Home > Td5 > TD5 temperature gauge fluctuating |
 
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| bob neville Member Since: 30 Apr 2009 Location: Marbella Posts: 3248   
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Clean the contacts on the sensor and check for any signs of chaffing on the wires.
Gauges normally use a common ground so worth checking that. Other things it could be - thermostat stuck open, sensor shot, air in the system (open the valve on the top hose etc.) Good luck Bob 2015 Jaguar XE240 R Sport - goes like ....... !! 2013 Defender 90 CSW - sold 2009 Defender 110 Double Cab - sold 2001 TD5 90 CSW - offroad project - sold to a forum member 2011 Porsche Boxster - for the sunny days ! |
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3rd Nov 2012 9:57pm |
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| Laurie Member Since: 22 Feb 2008 Location: Sussex, England Posts: 2897  
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Make sure your radiator(s) is clean.
TD5 Rads can only just cope.  |
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3rd Nov 2012 9:59pm |
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| jasong4110 Member Since: 18 Oct 2009 Location: Henley On Thames Posts: 268  
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I would say it's possible you have an earth fault, mine started doing this I went through all the wires etc and then ran a new earth to the bulkhead which sorted things...
However as on a run TD5's normally sit in the middle it could be the sender although this is very uncommon. Jason. |
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3rd Nov 2012 10:06pm |
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| Lou Sparts Member Since: 15 Apr 2012 Location: Kent Posts: 1501 
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I had a very similar problem on my Turbo Diesel years ago so swapped the sender (twice) tried a known good sender from a mates vehicle all to no avail so ran a new engine earth wire to the chassis and no more problems for the 5 years i owned it.Hope you get to the bottom of it soon. 2005 Td5 90 XS
Steve |
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3rd Nov 2012 10:17pm |
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6092 
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Check the earth on the ECU.
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3rd Nov 2012 10:34pm |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5843 
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Had a quick look this morning.
No loss of water Wiring to the temp sensor looks OK. Checked wiring at the back of the gauge and that looked OK. Where is the ECU earth cable ? I had a quick look but could not see it. Will check the rad and remove the air lock screw in the top hose. Does the temp gauge take its reading from the ECU via the sensor in the top hose (RHD side front of the engine) or is there a separate temp sensor the gauge? 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock |
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4th Nov 2012 10:55am |
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| wslr Member Since: 18 Jul 2010 Location: Wellington, Somerset Posts: 581
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It's a strange one, and interestingly I had someone give me the exact same description of an issue last week.
It could be the earth, or a wire being pulled tight as Jim says. Probably a good start point. You'll ideally need to unbolt the ECU and fuse box under the driver seat and just check the earth wire bolted to the bottom of the under seat box firmly. May even be worth removing and cleaning anyway. Also, on some I've seen the main loom being pulled tight through the under seat box (it heads off towards the transfer/gear box). However, when you get these, usually (not always) the gauge hits the red and the engine will cut out. So Jim's earthing is a good place to start as it is a minor fluctuation. Are you getting any other electrical issues, such as hard starting in the morning or the lights fading in and out? It may then be worth checking everything else is OK in the cooling system - Thermostat/pump etc. |
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4th Nov 2012 11:07am |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5843
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With the engine running, I had a look in the header tank and no bubbles. Still with the engine running I removed the airlock thingy in the top hose and got a goods squirt of water out straight away - which to me means the water pump is OK and no air in the system?
No probs on the checking/cleaning the earth on the ECU I might even run an extra earth direct back to the battery. No other electrical issues, no hard starting. I'm now waiting on the the glow-plugs as its gone colder (when warm I can just jump in a turn the key) Lights are not fading Now do you check the pump?. The stat I would have to remove and if I am doing that I may as well replace it.? 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock Last edited by excossack on 4th Nov 2012 11:19am. Edited 1 time in total |
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4th Nov 2012 11:17am |
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| T1G UP Member Since: 08 Dec 2009 Location: Bath Posts: 3101 
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I had oil in the ecu and I had an issue with the blue loom crimp in the ecu area making a intermittant earth fault. Do the guages flick about on start up?
Also consider battery voltage as TD5s hate a weak battery |
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4th Nov 2012 11:18am |
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6092
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You can just knock another "extra" on up.... use a ring terminal, crimp it to a piece of cable. bolt it under one of the ECU mounting bolts, then run it to a good earth point (ideally out the back of the seatbox following the battery cable (that runs the fusebox) back to the battery and straight onto the -ve terminal, but failing that a good body or chassis earth point will do. There are a couple of studs riveted onto the inside floor of the ECU underseat box, usually with a plastic cap on; this would be better than nothing) |
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4th Nov 2012 11:19am |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5843
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Checked the red plug an no oil. Well none since I replaced the loom about 3 years ago.
I did see the blue plug thing and was going to ask what it was for. 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock |
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4th Nov 2012 11:22am |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5843
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The gauges don't flick about on startup. It happened again yesterday on the way home drove about 30 miles all OK and then drove home in the evening again about another 30miles and then the gauge started doing its little dance, but not as much. Then it settled down for the rest if the trip. 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock |
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11th Nov 2012 10:17am |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5843
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Looking at the wiring diagram in the Haynes manual and it looks like there are two coolant temp sensors?
Wiring Diagrams 13.25 Diagram 3 item 32 - Coolant temp sensor with 2 wires. Pink/Black and Pink/Green feeding the ECU on terminals c158/8 and c158/7 13.27 Diagram 5 item 52 - Engine Coolant temp sensor with 2 wires. Green/Blue (then changes to Light Green/Blue) and Earth feeding the instrument cluster on terminals cc1052/2. Earthing on terminal c1052/1 to point earth point E2 and a wire from c1052/3 to Fuse 15, passenger fusebox. So are there two temp sensors? Is the passenger fuse box the one behind the gear stick? 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock |
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11th Nov 2012 7:56pm |
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| landyman37 Member Since: 22 Jan 2012 Location: west midlands Posts: 153 |
Do you have a pic of the diagrams
Phil |
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14th Nov 2012 10:40am |
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