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  1. #1

    Resetting Engine Light?

    I wanted to know if anyone can tell me how to reset the engine light on my 03 MSX 140? The dealer said he did not have the software updated on his diagnostic tool to reset the light. I had the dealer perform the service bullitn for the water temp sending unit and now the light will not go off Runs great I just have the annoying light on! Thanks!


  2. #2
    Watcon's Avatar
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    I'm not all that familiar with the Bosch ECU, but I think if you start the engine, then pull the "main relay" while its running, then re-install it, it should re-set the ECU..

    Possibly Jay can assist here or others more experienced?

    Regards,
    Randy

  3. #3
    Thanks I will try it out and see what happens!!!!

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    MSX 140? That is not a Bosch ECU, it is a Ficht EMM.

    If you have a red lamp on the display, then there is a problem still occurring. There is no 'reset' for the MSX 140 Ficht EMM. As soon as the problem goes away, the red lamp will go out.

    Is there a message on the display, such as Check Engine, or Reverse?

    BTW, welcome to the Hulk

  5. #5
    Thanks K447 I reset the EMM (unplugged/reconnected). From what my dealer told me there is no problem it just simply needs to be reset. The ski runs great and does not go into SLOW mode (as of now). The light that is on is the temp/check engine light along with the red lamp. I spoke with another dealer that told me the same thing as far as resetting the light, but they are booked for 2 weeks!! I am def open to ALL thoughts on this as I am newbie to Polaris. Thanks!

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    There is only one light - the red warning lamp.

    The display is showing one message, or two? Check Engine message, or HOT message?

    There is no 'reset' for the light on a Ficht 2-stroke engine. If the red light is on AND you have a warning message, then the EMM thinks there is STILL a problem.

    If the display is reporting HOT, and the dealer recently serviced the Temp sender, then something is still wrong.

  7. #7
    Thanks I guess I am totally lost since 2 "Dealers" (for what that means I am not sure anymore!) said the same thing. The display shows both the check engine and hot symbols. Not sure what else to check as I have gone through every hoes, temp sendor, screen, etc. and all is clear. I have run it in the water and pulled hoses (at different times) to make sure that water is flowing in all directions and into/ out of the engine. Any thoughts? Thanks!!!

  8. #8
    Click avatar for tech links/info, donation request K447's Avatar
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    Lets re-cap;

    This is a 2003 MSX 140 (3 cylinder engine, photo attached) - correct?

    Does the HOT warning appear right away when the engine starts from cold?

    What exactly did the dealer do for the 'Service Bulletin'?

    Are you comfortable doing electrical checks?

    If yes, unplug and measure the ohms on the exhaust manifold temp sensor.
    Specification is 985-1015 ohms at 77F(25C)

    Also check the wire harness for the sensor. Look for any damage, shorts, or places where the wires may be rubbing or worn.

    If the water temp sensor reading is within spec, then read the EMM Service Codes.
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  9. #9
    Well just had another dealer look at my 140 and he thinks the old temp sensor shorted out the computer. Is this possible? Is there anyway to test this thought? Are there rebuilt units? Thanks!

  10. #10
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by wawapolaris View Post
    Well just had another dealer look at my 140 and he thinks the old temp sensor shorted out the computer. Is this possible? Is there anyway to test this thought? Are there rebuilt units? Thanks!
    Are these dealers using Polaris Digital Wrench diagnostic software on their laptop computer to check the EMM?

    If the dealers don't have Digital Wrench, then they are mostly guessing.

    A bad temp sensor would not damage the EMM.

    Did you unplug the temp sensor? Any change?

    What exactly did the dealer do for that service bulletin?

    Was a new temp sensor installed?

    EMM can fail and need repair. If it does need repair, then DFI Technologies is the company that fixes them.

    However, if you are willing to do some diagnostics yourself, you can narrow the issue down. You can read the Trouble codes from the EMM yourself using a simple LED tool. Details can be found through the links in my signature.

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