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  1. 03-04-2018, 08:07 AM #1
    MD 20i
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    Engine air sensor

    2010 250 pro xs
    Serial #1b757176

    Last couple times I been fishing this has happened. Usually later in the day. While fishing and moving from spot to spot, each time I crank motor up i get this message on my smartcraft.

    First, a long 5 second beep. Then a message saying "engine air sensor not working". System fault #40.

    After a few seconds the beep goes off and I can exit the code and proceed to running

    Any help would be great. Thanks!
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  2. Savage
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    #2 03-04-2018, 08:26 AM
    The air temperature circuit is reading high. You have a wiring problem, or a bad sensor.

    Get it fixed before running the motor again.


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  3. MD 20i
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    #3 03-05-2018, 07:48 PM
    Which sensor do you think? I don't have an air temp sensor hooked to the smartcraft Speedo and it is turned off on the guage. Its got me puzzled.
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  4. Savage
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    #4 03-05-2018, 08:56 PM
    The sensor is on the motor.


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  5. MD 20i
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    #5 03-06-2018, 08:34 AM
    The sensor on the air compressor you think? Looks like part# 13536a12 or something. Thanks.
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  6. JOE54
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    #6 03-06-2018, 09:12 AM
    intake air temp sensor screws in intake plenum stbd side of air butterfly brass fitting with 2 white wires coming out
    .................................................. ...the scariest thing in life is the unknown ...................................
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  7. MD 20i
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    #7 03-06-2018, 09:19 AM
    Thanks. I'll check it out.
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  8. EuropeanAM
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    #8 03-06-2018, 12:46 PM
    Quote Originally Posted by JOE54 View Post
    intake air temp sensor screws in intake plenum stbd side of air butterfly brass fitting with 2 white wires coming out
    +1

    And I'll also add that if you have a piece of yellow plastic debris bouncing around in the cowling, OR in the intake, this may generate this fault.


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
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  9. MD 20i
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    #9 03-06-2018, 12:51 PM
    tell Rhonda i need one. I am emailing her now with some other items.

    Thanks again
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  10. EuropeanAM
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    #10 03-06-2018, 01:12 PM
    If it's a dire emergency... I might have one set back in my "stuff".


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
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  11. MD 20i
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    #11 03-19-2018, 09:57 AM
    Just to follow up. that sensor seems to have fixed my issue. thanks for the help everyone!
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