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Printerjohn



Member Since: 12 Mar 2024
Location: Poole Dorset
Posts: 26
United Kingdom 2006 Defender 110 Td5 XS CSW Barolo Black
No starting engine temperature gauge reads high
My engine does not start. With ignition switch in the the second position (before engine turns over) the temperature reads just below the red. If I try starting the engine the starter runs strongly, and temperature gauge drops to mid way. I have never noticed that the temperature gauge goes above zero before the engine starts. Is this correct? I have tried pressing the throttle down 5 times and cannot hear the fuel pump priming, and can't hear the usual noise from the pump either when I switch on the ignition.
Post #1055335 22nd Dec 2024 12:05pm
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5755
2006 Defender 110 Td5 USW Zermatt Silver
Run a new earth to where the underseat fuses and relays are. Even just a temporary one for a test.
Post #1055348 22nd Dec 2024 3:59pm
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Martin
Site Admin


Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6626
United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
Sounds like ECU not "on". Need to check power and grounds at ECU black plug, and the ignition "wake up" feed.

Grounds: Black
Main Power: Brown/Orange (but will only be live with ECU plugged in and switching on main relay, difficult to test it unplugged)
Wake Up/Ignition: White/Green

You'll need a multimeter to check continuity to ground/battery negative for the grounds, and voltage to ground/battery negative for the power/ignition.  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #1055355 22nd Dec 2024 4:17pm
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Printerjohn



Member Since: 12 Mar 2024
Location: Poole Dorset
Posts: 26
United Kingdom 2006 Defender 110 Td5 XS CSW Barolo Black
Looking like an electrical problem from the hidden security switch fitted by a previous owner.
Post #1055372 22nd Dec 2024 7:25pm
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AndyT66



Member Since: 19 Sep 2016
Location: Bedford
Posts: 149
England 2004 Defender 90 2.5 TD XS CSW Zambezi Silver
Have you resolved this one?. I have had a similar one with the temp straight to red, even with a cold start. Fuel pump silent. Fixed mine with a new fuel pump relay under the drivers seat. It was sticking. I did manage to start up simply by giving the relay a tap with a screwdriver. Happy to send a pic of which one if you would like me too cheers
Post #1055761 28th Dec 2024 12:11am
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Printerjohn



Member Since: 12 Mar 2024
Location: Poole Dorset
Posts: 26
United Kingdom 2006 Defender 110 Td5 XS CSW Barolo Black
Problem sorted, I think the fuel cut-off switch must operate on the fuel pump relay, hence the temperature reading high when the engine is not running.
Post #1055786 28th Dec 2024 5:27pm
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