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  1. #1

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    No Lake Temp after upgrading iBR unit

    Hi Guys,


    Ski is a 2009 RXT IS 255.


    So the other week I started getting iBR errors, with a whole bunch of codes. I traced the problem back to the iBR unit being faulty, and made the call to replace it.


    I opted to upgrade at the same time to the later model Gen2 iBR units with the twin bolts into the "U Arm", and from what I understand is an overall better design electronically and mechanically. From what i can tell they started coming in 2013. As a biproduct of this, i now have a lake temp reading of 199 degrees (which basically tells me the lake temp sensor is not working)


    The Gen1 (2009 - 2012) iBR units have water pumped across a sensor in the iBR unit itself. This sensor is what reads an interprets the lake temperature. However on the later iBR units, this water jacket does not exist. Instead Seadoo introduced a physical external LTS (lake temp sensor) allowing the replacement of the sensor itself (in the event it went faulty), rather than having to replace the whole iBR unit itself as you would have in the earlier versions.


    The red circle indicates the difference in the two units.





    It appears as though in 2013 seadoo introduced the updated iBR unit, removing the water jacket from the iBR unit, and replacing it with an external LTS (Lake Temp Sensor). Has anyone tried to retrofit one of these later iBR units to an earlier ski?. If so - how did you tackle the LTS issue?

    From looking at the diagrams in the 2013 workshop manual (below), theoretically i should be able to buy the 2013 LTS sensor, and use the two wires pictured in the below wiring schematic (assuming they exist in my 2009 ski.)




    Open to thoughts or suggestions from anyone.


    Dave
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  2. #2
    DR2006RXP's Avatar
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    If you have access to the full diagram see if the cables run separate in the ibr connector or if the sensor is built into the ibr unit and it then sends a can message you would maybe have to run a new line .

  3. #3
    DR2006RXP's Avatar
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  4. #4
    DR2006RXP's Avatar
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    Theoretically it should work as the Ecu from 2009-2015 is all compatible so the fact the service manual does not show the additional wiring and the 2013 does and so forth them once wired it should work .

  5. #5

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    No Lake Temp after upgrading iBR unit

    Cheers DR2006RXP.

    I was thinking along the same lines.

    Do you think the fact that it’s reading so high will cause any issues until it’s fixed? It hasn’t thrown any codes, and I can’t find any literature advising against it.

    Dave

  6. #6

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    I have same problem with my gtx 255 is. I was thinking of replacing the circuit card inside ibr. I m looking for a cheep used ibr with burnt motor to take the card from it. What you think?

  7. #7

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    Personally I reckon any “broken down” first gen ibr’s you find will be because of a dicky circuit board.....not a blown motor. The motors to me seem like a pretty straight forward electric motor. Not really prone to failing unless they I hear salt water.

  8. #8

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    Quote Originally Posted by DR2006RXP View Post
    Theoretically it should work as the Ecu from 2009-2015 is all compatible so the fact the service manual does not show the additional wiring and the 2013 does and so forth them once wired it should work .
    So I’m trying to figure out where I can buy the pins to go into the ecu connector.

    Seems as though yes, I need to run two new wires to what will be the new temp sensor.

    Any ideas what the pins are called or where I could get them from?

    Many thanks

    Dave

  9. #9

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    Maybe you could find the wire(s) you want on the ibr plug and connect the LTS there.

  10. #10

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    The wiring loom on the 2009 uses a CAN signal for temp. Which won’t work on the later model temp sensor.

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