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gazman



Member Since: 17 Aug 2015
Location: Liverpool
Posts: 652
United Kingdom 2003 Defender 90 Td5 HT Alpine White
Help needed TD5 ecu not powering up
Help needed. Td5 90 suddenly stopped when driving, felt like a fuse had blown or a broken connection as the engine stopped dead.

Has no EML, no fuel pump or main relay click when ignition turned on. Water gauge doesn't move indicating a bad earth, oil and battery lights etc still work and starter motor works fine.
Plugging into a diagnostic machine the diagnostic kit can't see the ECU but can see the 10as alarm.

Tried a 2nd known working ecu which gives the same symptoms in my 90.

All fuses tested, relays swapped, impact sensor on bulkhead bypassed, main earth on chassis to battery box cleaned, earths ran from ecu case direct to battery. Bridging the fuel pump relay makes the pump run.

I'm only measuring 6v on the brown with orange tracer on the back of all the repays and the ecu. Is that my issue and how do I resolve it?? Battery isn't flat. 2014 - current ..... 2003 defender td5 90 (my car)
2009 - current .... 2005 zx10r
Post #950051 21st Apr 2022 10:33pm
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5849
2006 Defender 110 Td5 USW Zermatt Silver
Do you have 12v going to the underseat relay/fuse board?
Post #950058 21st Apr 2022 11:12pm
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gazman



Member Since: 17 Aug 2015
Location: Liverpool
Posts: 652
United Kingdom 2003 Defender 90 Td5 HT Alpine White
Yes 2014 - current ..... 2003 defender td5 90 (my car)
2009 - current .... 2005 zx10r
Post #950065 22nd Apr 2022 12:22am
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MadTom



Member Since: 10 Sep 2013
Location: Olomouc
Posts: 645
Czech Republic 1999 Defender 130 Td5 HCPU Baltic Blue
When you turn on the ingnition, does it light MIL and GLOW lights on instruments board? If not, and all fuses and relays ar OK, you ECU is not working - not running software inside. With never NNN type ECUs, it is not uncommon, that engine ECU fail this way. It is often repairable. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo Smile
Post #950082 22nd Apr 2022 9:19am
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lightning



Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 3011
United Kingdom 
ECU has likely failed, exactly the same symptoms as mine, just stopped dead.

No EML or temp gauge, no relay, no fuel pump, no glow plug light

Try Mastaz in Hazel Grove Cheshire (google Mastaz TD5) l gave my ECU to him so he could copy the injector codes on to a replacement, but he repaired it for £80

l bought a spare ECU off him anyway in case it happens again, he charges £700 for those but the likelihood is he'll repair your old one. On mine it was a single resistor that had failed.
Post #950224 23rd Apr 2022 12:58pm
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gazman



Member Since: 17 Aug 2015
Location: Liverpool
Posts: 652
United Kingdom 2003 Defender 90 Td5 HT Alpine White
Thanks mate I will contact him 2014 - current ..... 2003 defender td5 90 (my car)
2009 - current .... 2005 zx10r
Post #950786 27th Apr 2022 8:57pm
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diesel_jim



Member Since: 13 Oct 2008
Location: hiding
Posts: 6161
United Kingdom 2006 Defender 110 Td5 SW Epsom Green
What was the outcome of this gazman?
Post #994711 1st Jun 2023 9:38am
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Shrubby69



Member Since: 30 Aug 2024
Location: Tunbridge wells
Posts: 1
United Kingdom 2001 Defender 90 Td5 HT Caledonian Blue
Hi Gazman - I have exactly the same issues that you had. What’s was the fix in the end? Cheers
Post #1063808 24th Mar 2025 11:52pm
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Notyalc



Member Since: 27 Jul 2018
Location: Northumberland
Posts: 169
United Kingdom 2003 Defender 90 Td5 HT Epsom Green
Ive just had the same story. The board in my ECU had started to delaminate in between the several layers (there are 5 or 6 i think).

Spoke to several people about repair or replacement. I went with Gareth at Empire Tuning in the end.

Sure enough when i sent him my ECU he gave the bad news that the board was fubar.

He was able to supply a replacement with a new map in a couple of days. Great service. I was up and running again within a week so well happy.
Post #1063882 25th Mar 2025 7:58pm
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