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Thread: ECU error 29?? help thanks

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    Default ECU error 29?? help thanks

    hi

    i have had just a few problems with a C14SE anyway the ecu flags up error 29 = low fuel pump relay voltage

    can anyone give me a clue what to check and how low volts would occur?

    i have btw swapped the relay

    steve

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    Fuel pump relay?

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    Could be a wiring fault, something shorting to earth would cause low voltage to come up

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    Quote Originally Posted by andy_mk3
    Could be a wiring fault, something shorting to earth would cause low voltage to come up
    that sounds more like it, i will meter the relay supply see if it earths. to be honest i would have thought a fuse would have blown?

    i have 4 relays 3 second hand and 1 new....what are the chances of all being faulty?

    steve

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    May also be the pump itself at fault.

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    the pump is a brand new walbro 255 motorsport and filter the fuel pressure is fine at 3.5bar

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    I guess its not that then!

    What problems are you actually having with it?

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    right here goes

    fuel pressure as said is fine

    getting a good spark (new coil, amp, rotor arm, dizzy cap and leads)

    spark plugs are new and gap is correct

    timing spot on and checked with a lamp

    new CTS and TPS

    car really really tries to start takes about 10 goes before it finally ticks over but it is very 'lumpy' as soon as you hit the throttle the engine dies

    from then on it starts first time but dies again

    today was the first time the CEL came on and showed code 29, no other codes (apart from 12 )

    i have half a tank of fresh petrol

    also compression is good on all cylinders

    steve

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    Has a compression test been done?

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    dam it, could'nt edit fast enough

    and before you say it, i have changed the injectors

    oh yes and i have a spare ecu

    AND A BOX OF MATCHES
    Last edited by Steve0011; 30-06-10 at 11:47 PM.

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