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Thread: Strange problem with Defender TD5

  1. 4th November 2010, 09:07 PM #1
    Champ54
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    Question Strange problem with Defender TD5

    Hi All,
    I have a 2000 Defender TD5 with a strange problem that I am hoping someone can suggest a solution for. I bought the vehicle as a non goer and have just installed a reconditioned engine. The engine starts and runs well but as soon as anyone sits on the driver seat the engine stops. Strange but it definately happens. I have tested the wiring harness and all the wires into the ECU and all test OK. Fitted new Crank Angle Sensor and new fuel pump. Pump pressures test perfect. Engine starts perfectly every time but as soon as weight goes on the driver seat the engine stops. I think it has to be a wiring fault somewhere but the question is where. When the weight goes on the seat the "check engine" and "glo-plug" lights flicker. Plug in the Hawkeye and all reads OK until weight goes on the seat and it then looses the data connection.I have tried pressing down on the ECU and wriggling the cables but the engine runs perfectly until weight goes on the seat then it stops. Any suggestions welcome please.
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  2. 4th November 2010, 09:12 PM #2
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    stig0000
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    prity good sercuraty if you ask me
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  3. 4th November 2010, 09:19 PM #3
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    Blknight.aus
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    dropping the earth on the ECU or one of the under seat relays.

    some people being lazy use the seat mounting bolt to make the earth because its easier than the proper one.
    Dave

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  4. 4th November 2010, 09:23 PM #4
    rovers4
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    A sensitive seat

    My guess is that the sensor in the seat/seat belt wear system is wired back to front, or the wiring has been corrupted.

    Isn't it the case that if a passenger is not wearing their seat belt that there is a warning or lockout that comes into play to stop the vehicle?

    Rovers4
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  5. 4th November 2010, 09:37 PM #5
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    not in the deefer there isnt.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
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  6. 4th November 2010, 09:44 PM #6
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    roversmith
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    Ecu earths to gearbox below the seat. First place I would look.

    Cheers Greg
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  7. 5th November 2010, 11:46 AM #7
    Champ54
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    Strange Problem with DEFENDER TD5

    Thanks for the suggestions. I suspected an earth problem.
    What I intend doing tonight is to run a new earth from the battery direct to the ECU earth point and then to the earth point in the seat box directly below the seat and see if that has any effect.
    The UCU earth on my TD5 is actually anchored on the chassis directly below the seat but I note from responses that it should be on the gearbox. Does anyone know exactly where on the gear box it is supposed to be located.
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  8. 5th November 2010, 03:15 PM #8
    mildred
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    Talking mother in law wins

    Quote Originally Posted by stig0000 View Post
    prity good sercuraty if you ask me
    its de definitely a case for a back seat driver take over,she's been waiting for this for years?,sheb
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  9. 5th November 2010, 05:35 PM #9
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    roversmith
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    Quote Originally Posted by Champ54 View Post
    Thanks for the suggestions. I suspected an earth problem.
    What I intend doing tonight is to run a new earth from the battery direct to the ECU earth point and then to the earth point in the seat box directly below the seat and see if that has any effect.
    The UCU earth on my TD5 is actually anchored on the chassis directly below the seat but I note from responses that it should be on the gearbox. Does anyone know exactly where on the gear box it is supposed to be located.

    Any threaded hole or bolt, the electrons won't care.

    Cheers Greg
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