Fuel Injection Light

Discussion in 'Motorbike Technical Discussion' started by Hemuji, Sep 3, 2003.

  1. Hemuji

    Hemuji Guest

    Hi Guys,

    Have a problem with my 1999 GSX-R 750. After riding approx 20 miles
    the fuel injection warning light glows red and then the bike begins to
    do periodic hiccups. The light and the hiccupping goes away once I
    stop the bike, turn the ignition off and restart. This only happens
    after riding it for 20 miles or thereabouts. The hiccupping seems to
    go down in periodocity if I down shift to the 5th gear and ride it at
    that. But at 6th, it is more often though the rpm is 7000 or more.

    I cleaned the air filter and air box and checked the air passsages,
    seemed clean. Took it to the dealer and after charging me $50 told me
    that they couldn't replicate the problem.

    Any help or suggestion will be appreciated. Thanks.

    Hemuji, Sep 3, 2003
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  2. Hemuji

    Dan Carter Guest

    Some FI systems are particulary sensitive to voltage. First, check your
    battery connections. A poorly connected battery can cause all sorts of
    bewildering problems. Also check ground connections. If they're
    exposed to the elements, periodically clean them and apply Boeshield T9
    (check aircraft supply places) to prevent corrosion.

    If that doesn't take care of it, the proper way to diagnose the problem
    is described in the bike's factory service manual. The warning light
    should be supplemented with a more detailed description, perhaps
    controller box LEDs or a dash display activated by pressing buttons in a
    certain sequence.
    Dan Carter, Sep 3, 2003
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  3. Hemuji

    Macgyver Guest

    I'm not to familiar with the workings of FI on bikes, but on cars the
    FI light usually indicates an error, where a reading from a particular
    sensor is out of range. If the error continues to occur, the ECM
    usually switches to a 'limp home' mode, which usually results in rough
    running but is enough to keep the engine going. I often have problems
    with fuel, where a bad batch causes the oxygen sensor to give false
    readings, putting the ECM into limp home mode and as a result the car
    carries on until switched off and restarted...

    Maybe go through the manual and look for a diagnostic mode?

    Hope this helps

    Macgyver, Sep 7, 2003
  4. Hemuji

    Geribaldy Guest

    If it's the same as the Hayabusa you can find the dealer mode connector (On
    the busa it is a 4-way connector with just 2 wires into it, on the left side
    of the bike behind the battery), then you can do this:
    Run the bike until you get your fault, then stop the engine, but leave the
    ignition on, and bridge the two wires in the dealer mode connector.You will
    then get a fault code on the display unit on the clocks.C00 means no errors
    on the busa, but you'll have to read the error and tell it to the dealer for
    him to know what's wrong.
    Please remember these instructions are for the busa, and may be a little, or
    a lot different to the 750.
    Geribaldy, Sep 7, 2003
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