 | Home > Td5 > TD5 ECU repairs |
 
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| MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 639   
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During last winter I have spent some time with non working TD5 ECUs and as a result I made schematics of the ECU internals and I think, I understand how the hardware of ECU works. Here are some pictures and videos of ECU testing with crank signal simulator: https://www.rajce.idnes.cz/ok2mtm/album/td5-ecu-oprava-repair
I was able to repair quite fast 10 ECUs I had here as death on arrival for long time. Problems were different, often broken passive component, but never problem with the two big capacitors. To simulate the crank sensor signal I use basic Arduino board with short and simple code. For first test runs I was using spare set of old injectors, but it is quite noisy, so I made some solenoids with screws used as cores and to make the running ECU audible a visible. Non repairable are ECUs totally burnt (small burnt through hole is still possible to repair) or drowned for long time. Bot of these results in too big much damaged parts. With schematics faults like TOP SWITCH are possible to diagnose and repair. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo  |
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8th Mar 2024 10:43am |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6641  
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Very impressive
  1988 90 Td5 NAS soft top
2015 D90 XS SW |
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8th Mar 2024 10:53am |
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| Prisk81 Member Since: 12 Feb 2025 Location: Cesena Posts: 3 
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Hi, do you have problem some times with rpm 0, so not start? In diagnosis I have 0 rpm in cranking but with oscilloscope on ecu pin signal is good...
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12th Feb 2025 5:05pm |
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| TexasRover Member Since: 24 Nov 2022 Location: Paris Posts: 1144  
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Are they robust generally? I have a 15p Td5 and manage to get my hands on a free 10p ECU which I keep for emergency spare, i understand this would get you home.. (I have a nanocom)
Probably should be looking for the correct ECU, but look a bit pricy? |
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12th Feb 2025 5:28pm |
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| Prisk81 Member Since: 12 Feb 2025 Location: Cesena Posts: 3
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I try to repair my ecu before search another one.
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12th Feb 2025 7:41pm |
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| MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 639
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For "emergency" run of TD5 engine, you can use any engine ECU, just "solve" immobilizer - pair it with car of "remove" from ECU. In one car (Defender TD5 or Dicsovery 2 TD5) you can pair more than one engine ECU, so after this basic "preparation" it is just plug and play. No need for any diagnostics use.
All TD5 ECUs use the same hardware for controlling injectors. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo |
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14th Feb 2025 7:59am |
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| jonny Member Since: 10 Mar 2013 Location: North Wilts Posts: 172 |
If you are keeping one for emergency use (eg. overlanding), there's probably a few more steps you should take - copy the injector settings over etc.
But 'cloning' one ECU to another is fairly well documented so if you were going to the lengths of having a spare ECU you may as well clone it totally when you disable the immobiliser.. |
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14th Feb 2025 10:09am |
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| Prisk81 Member Since: 12 Feb 2025 Location: Cesena Posts: 3
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Thank you. I have found the resistor/ fuse connected with injectors gnd blown,it measure 1,6 kohm now I must known value of it and after see for other component that can have damage
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14th Feb 2025 11:36am |
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