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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20376  
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Check main power wiring and grounding. Worth looking at, even if not the culprit. $W33T $0U7H3RN $UG4R
🇬🇧🏴🏴🏴🇮🇪🇺🇸⛽️🛢️⚙️🧰💪 |
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14th Dec 2021 7:38pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5707 
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Check you have power across to the under seat fuse board and relays. Whilst there check neg too.
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14th Dec 2021 8:17pm |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 2777
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That's one thing l didn't check, although l have checked the earth, l even ran a wire directly to the battery.
I will go outside and have a look, l am sure the RAC guy would have checked it but you never know. |
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14th Dec 2021 8:34pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5707
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He may not “know” defenders. There aren’t many vehicles where you nee to take a seat apart to find a fuse board,
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14th Dec 2021 8:36pm |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 2777
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He's definitely been in the seat box because he's cleaned the connectors to the ECU.
I checked for power to the under seat fuses and it's okay. l also checked the earth again, in fact l connected a jump lead between the seat box/ECU and battery negative....no change. |
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15th Dec 2021 8:38am |
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| kenzle8a Member Since: 12 Feb 2020 Location: None Posts: 1074 
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Dodgy inertia cut off switch?
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15th Dec 2021 8:58am |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
Power ECM i.e.
 as most of the this that not working receive and switch ground from the ECM
No EML light controlled ecm No glow plug light this relay controlled by the ecm No temp gauge driven by ecm (all other gauges still work ) No fuel pump whine this relay controlled by the ecm But start motor control relay receive and switch ground from the alarm unit and + from ign switch C0658 plug ref black plug ecu pin 33 ignition input to the ecm check fuse 12 10 amp passenger fuse box all so make shore you have 12v both side the fuse and to pin 33 (see below ) pin 1-2-24-25 ground for ecm check all pin 22 + battery supply ecm switch by main relay and feed from inertia switch make shore you have 12v both side the switch and down to one side of the main relay 
for the ecm start up to take place the ignition switch must be in position `ii ` and no less that 6v must be supplied to pin 33 black plug on the ecm at this point main relay engages and provides battery supply ecu and other components if main relay fails or loses supply engine will crank but not start or if running stop running Last edited by dorsetsmith on 15th Dec 2021 12:34pm. Edited 13 times in total |
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15th Dec 2021 9:03am |
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| jimbo55 Member Since: 15 Jul 2020 Location: Midlands Posts: 399
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Given that the engine cranks, I wouldn’t be worrying about the earths too much, it wouldn’t crank properly if the earth was a problem. As lord haggis says, inertia switch would be where I’d start as that cuts the power to the main relay
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15th Dec 2021 9:43am |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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If the engine just stopped, but cranks, but there is no fuel pump, glow plugs, gauges or EML then the likelihood is that it is one of three things, power to the ECU, Earth from the ECU or a dead ECU. Any chance you have someone close by you could borrow an ECU off just to check?! |
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15th Dec 2021 10:14am |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 2777
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Thank you for the above information, this is all really useful advice.
The Defender is with the LR specialist now but l will pass this information on to them. l will report back on what they find. |
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15th Dec 2021 1:13pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Great keep us informed
 And good luck |
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15th Dec 2021 1:53pm |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
may your problems be small ones
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15th Dec 2021 2:31pm |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 2777
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So it needs a new engine management unit.
Anybody know where l can get one quickly? It's a late Defender TD5 Part no. NNN50020 |
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15th Dec 2021 6:12pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Call up Bell services or Alive they will have one sitting on the shelf ready to go.
Sorry it was the ECU... Miffy is on her second one too...  |
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15th Dec 2021 6:52pm |
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