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  1. #1

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    Msx 140 injection doesnt work

    Hi
    yesterday i have riding my msx 140, it runs great till motor died.
    It couldnt start again although starter was running good.

    When arrived to land i sprayed some fuel to the 3 air intakes and motor starts but after a few seconds died. It means ignition is working well.

    Then i have checked fuel pressure and found it ok.

    All signs are directing me to the injectors. That looks like non operating at all.

    Could someone direct me where to look? Can it be the large capacitor?

    Gabi


  2. #2
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    Check for voltage on the injectors to see if they are getting power.

  3. #3

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    Quote Originally Posted by BryanP View Post
    Check for voltage on the injectors to see if they are getting power.
    No voltage at all on the RW wire that goes to the injectors.
    I connected external 20v battery to this wire and the motor wants to start.
    What can it be?

  4. #4
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    EMM or stator would be my guess.

  5. #5

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    Ignition works fine, (if i put some fuel in the air intakes, then the motor starts which means spark plags works fine), is this means the stator is ok?

    Could it be the large capacitor? Or most chances its the EMM?

  6. #6
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    I would first pull the large plug from the EMM and check it for corrosion. Check the connections to the injectors as well. Hopefully Keith will chime in here. He can point you in the best direction.

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Gmagnezi View Post
    Quote Originally Posted by BryanP View Post
    Check for voltage on the injectors to see if they are getting power.
    No voltage at all on the RW wire that goes to the injectors.
    I connected external 20v battery to this wire and the motor wants to start.
    What can it be?
    Injector power wire should have over 20 volts when the engine is cranking, and over 40 volts when the engine is running (typically close to 45 volts above idle RPM).

    The most common cause of very low or no injector voltage is a failed EMM power section. This is the internal section of the EMM with 8-pin and 12-pin Deutsch connectors.

    Make sure the diagnostic loop-back 4-pin wire harness connector is properly connected together and the Red/White wire is not damaged anywhere.

    If you have a spare EMM you can switch the 8 and 12 pin connectors to the spare module for a test.

    See my signature web links for more info on testing and repair of the Ficht EMM.

  8. #8

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    You are right, power section burned out

    Quote Originally Posted by K447 View Post
    Quote Originally Posted by Gmagnezi View Post
    Quote Originally Posted by BryanP View Post
    Check for voltage on the injectors to see if they are getting power.
    No voltage at all on the RW wire that goes to the injectors.
    I connected external 20v battery to this wire and the motor wants to start.
    What can it be?
    Injector power wire should have over 20 volts when the engine is cranking, and over 40 volts when the engine is running (typically close to 45 volts above idle RPM).

    The most common cause of very low or no injector voltage is a failed EMM power section. This is the internal section of the EMM with 8-pin and 12-pin Deutsch connectors.

    Make sure the diagnostic loop-back 4-pin wire harness connector is properly connected together and the Red/White wire is not damaged anywhere.

    If you have a spare EMM you can switch the 8 and 12 pin connectors to the spare module for a test.

    See my signature web links for more info on testing and repair of the Ficht EMM.
    Today, i have checked the voltage on the 12 pin connector and was ok.
    i removed the EMM and opened it and have found burned area with smoke smell.
    See picture attached
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  9. #9
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    Time to call DFI......

  10. #10
    I'm addicted to Polaris PWC ghostinstallations's Avatar
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    Quote Originally Posted by BryanP View Post
    Time to call DFI......
    DFI seems to not be interested in repairs to damaged boards. I have one they would not repair with less damage.

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