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  1. #1

    intake air temp sensor starting to fail and what ecu does

    I have seen many logs from ski with different intake air temps.

    This can be result of outside air temps and different intercoolers and so on.

    But in some cases its the sensor itself starting to fail.

    I have seen skis with low hour on them with bad sensors.
    Last was a 2013 Rxt-x with 10 hours on it.

    When ECU see that the intake temps start to raise it will ad more and more fuel and retard the ignition.

    Result is that you will have a increased consumption and loose top speed and rpms!

    This error can be a bit tricky to see in the beginning since it can come gradually.
    When intake temps are to high ,ski will go in to limp mode but then you will already have run it for a while and maybe your far from replacements when it do limps.


    Best way is to have a vtech datalogger but you can also check the sensor with buds.

    Easiest way to see if sensor is ok is to have a cold engine and see if intake air temp sensor displays similar values as engine temp and exhaust temp.

    OK sensor:
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    Not ok sensor

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  2. #2
    TheElite0ne's Avatar
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    Is this the sensor in question?

    9 420222423 TEMPERATURE SENSOR 1 46.99

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  3. #3
    GasResearch-VT.SE's Avatar
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    Quote Originally Posted by TheElite0ne View Post
    Is this the sensor in question?

    9 420222423 TEMPERATURE SENSOR 1 46.99

    Click image for larger version. 

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    Thats the one!

    There was a problem with a batch of these from factory.

    They also become problematic if they get splashed with water droplets while active.

  4. #4
    Having Fun jp1300r's Avatar
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    They also become problematic if they get splashed with water droplets while active.[/QUOTE]

    This can happen when the I/C goes bad/leaks which happens alot with the newer skis.

  5. #5
    alex29573's Avatar
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    is there a way to test with an ohm meter?

  6. #6

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    What would be some other symptoms of a bad sensor? I am fighting loosing rpm problem and can't seem to narrow it down. I go out for a blast and pull rpm 8200-8220 and then go a half hour later and I am down 100 rpm. Temp and humidity relatively the same.

  7. #7
    Eric Ocman's Avatar
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    Quote Originally Posted by RobKman View Post
    What would be some other symptoms of a bad sensor? I am fighting loosing rpm problem and can't seem to narrow it down. I go out for a blast and pull rpm 8200-8220 and then go a half hour later and I am down 100 rpm. Temp and humidity relatively the same.
    100 rpm just sounds like heat soak.

  8. #8
    dpracing's Avatar
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    Quote Originally Posted by alex29573 View Post
    is there a way to test with an ohm meter?
    +1

  9. #9
    You can check this with Candoopro as well....

  10. #10
    Moderator Snoman's Avatar
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    Quote Originally Posted by alex29573 View Post
    is there a way to test with an ohm meter?
    Yes there is...Disconnect the sensor,using the OHm meter the resistance should be between 2280 and 2740 ohms at 20 degrees C./68 degrees F.

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