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Thread: Ready for a bonfire........

  1. #1
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    Default Ready for a bonfire........


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    F99B0C0A-DB8D-47D4-9EA5-FB662E0ADD69.jpgHi, I have a Yamaha MT03 660 a 5YK bike on an 07 plate.
    The bike was bought in a bit of a sorry state, nothing to serious, just unloved and was to be a weekend project and eventually to take me on the 5 mile blatt to work.
    When the bike arrived everything on the bike worked, with the exception of the brake light. After a little investigation I discovered that the wiring loom was cheese, melted in several places with crude repairs.
    After discovering that Yamaha no longer produce this part, I managed to find a ‘new’ loom online. The loom arrived in its Yamaha bag looking like it had never been fitted and I was confident that this would be the answer to my problems..... but no! Now I have a flashed fault code 53, telling me that the ECU is not receiving a signal from the immobiliser, possible causes 1. Faulty immobiliser, 2. Faulty ECU, 3. Faulty wiring.
    I managed to source a known to be working ECU immobiliser and ignition which once plugged into my new loom, gave the same fault code, I then downloaded the wiring diagram and located the signal wire between the immobiliser and the ECU, this also checks out for continuity.
    I am at a dead end so any help or suggestions would be appreciated, in order to stop me burning it! ��
    Many Thanks,
    Simon

  2. #2
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    Default Re: Ready for a bonfire........

    Was the loom you bought online the same part number as the original? AFAIK the 5YK2 and 5YK2 shared identical electrical harnesses but I'd want to double check. Sorry I can't be more helpful but I tend to plod when it comes to electrics.

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  4. #3
    Should Get Out More a_morti's Avatar
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    Default Re: Ready for a bonfire........

    Sounds likely the loom is for one with an immobiliser and your bike doesn't have one?

    On cars you often have to relearn the ECU as there is a resistor of a fixed value somewhere (ignition switch maybe) which has to match as a checksum in the ECU.

    At that point you are into dealer scan tools.

  5. #4
    Should Get Out More Screwdriver's Avatar
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    Default Re: Ready for a bonfire........

    So you replaced the entire wiring loom to fix a brake light?

    ...and now you'd like to know how to circumvent the immobiliser?

    Put the original harness back and splice in a new wire for the brake light.

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  7. #5
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    Default Re: Ready for a bonfire........

    Me to, I would rather rebuild the engine than mess with the spaghetti ....the replacement loom was 5YKH25900200. I was told by Yamaha that ether the 00100 or 00200 would work. The original loom part number was illegible.

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