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How I fixed my TD5 ECU (maybe worth doing for preventative reasons too)

Discussion in 'TD5' started by BulletBrindle, Mar 6, 2022.

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  1. lightning

    lightning Well-Known Member Full Member

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    Yes those are the ones. l am not sure what errors come up when they fail, but the symptoms are engine stops and you get no fuel pump, no temperature gauge, no EML light and no glow plug light
     
  2. Stanleysteamer

    Stanleysteamer Well-Known Member Full Member

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    Too right!
    My first ECU, the one that got dropped, and had been chipped (Grrrr!) promptly fell off the communication horizon, so i had to replace it with an ornery one. Even a clever lady engineer with a microscope couldn't find a break on/ in it.
     
  3. BulletBrindle

    BulletBrindle Active Member

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    I received my broken ECU back today, but sadly this is not how it behaves when I give it a try. Everything works normally, apart from it will crank and crank, but just won't take (I'm sure fuel is not being injected).

    Cheers for all of the pointers though. Any other ideas, or is it time to move on and buy one off eBay?
     
  4. lightning

    lightning Well-Known Member Full Member

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    Try a call to "Mastaz TD5" (google it)

    He's local to me and really seems to know his stuff, he may be able to repair it for you.
     
  5. sierrafery

    sierrafery Well-Known Member

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    measure voltage while cranking, if it dropd below 10.5V it wil not start and if you have nanocom or similar make output tests for the injectors to hear them clicking
     
  6. BulletBrindle

    BulletBrindle Active Member

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    The truck runs perfectly with my other ECU, so I think I'll just buy a working one from eBay as a spare
     
  7. BulletBrindle

    BulletBrindle Active Member

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    Thanks for the tip - good to know who to try if/when I get another ECU failure
     
  8. lightning

    lightning Well-Known Member Full Member

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    They are around £700 on Ebay, Discovery ones are cheaper but they don't work properly in the Defender (which is why they are cheaper....nobody wants them)

    l would try getting yours repaired first, the guy l recommended above charged me £80 to do mine
     
  9. BulletBrindle

    BulletBrindle Active Member

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    Thanks, I'll give him a buzz
     
  10. BulletBrindle

    BulletBrindle Active Member

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    I've just had my dodgy ECU checked with a Nanocom, and the results are somewhat unexpected...

    When it first failed, it was showing Topside Switch Failure and Injectors 1-5 Open Circuit, but this time it wasn't showing any errors at all (except ABS and Aircon, but they were expected).

    Communication with the ECU was definitely fine. Any ideas what no error codes could mean?

    Cheers
     
  11. BulletBrindle

    BulletBrindle Active Member

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    Small update here, in case it's helpful for anyone...

    I'm told that a faulty ECU that is not showing any error codes, but that communicates ok with a Nanocom, could mean that the main processor is playing up and needs replacing.

    A friendly electronics engineer from work is looking at this for me, so it'll be interesting to see what the outcome is. I know it probably makes more sense just to buy a used one of eBay, but I enjoy the challenge!
     
    Def90man and Dippypud like this.
  12. sierrafery

    sierrafery Well-Known Member

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    It depends, can you read live inputs while cranking with that ECU? cos if the processor is gone it will not show any data
     
  13. lightning

    lightning Well-Known Member Full Member

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    Have you checked the surface mount resistor banks around the microprocessor IC?

    lf faulty they can be bridged with a regular resistor but it takes a bit of skill with the soldering iron to do it.
     
  14. BulletBrindle

    BulletBrindle Active Member

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    I've not tried this specifically yet.

    These are on the list for my colleague to check, along with some other components, before we have a go at replacing the the processor as a last resort. Hopefully it won't come to that!
     
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