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  • Re: High EGT's and low RPM

    by » 7 months ago


    Has anyone heard of the Manifold Pressure sensor failing?  That seems to be another central point between the two lanes.  

    24878_2_01d71384064f3d0ff91f04aafae5c7acc87d1f5990.jpg (You do not have access to download this file.)

  • Re: High EGT's and low RPM

    by » 7 months ago


    There is an SB concerning the MAP connectors pulling Off of the sensors due to the harness being a little on the short side.

    Rotax made an optional locking clip available to secure the locking bail.

    Make sure the connector is on the sensor and is fully locked.

    Cutting the first Tye-Wrap in the Wire harness upstream of the connector will produce some slack.

    Replace the Tye Wrap but leave the sensor cable free of the bundle.

    - - -

    There are 4 sensors on the AirBox.

    One Air Temp and One MAP feeds the Lane "A" ECU.

    One Air Temp and One MAP feeds the Lane "B" ECU.

    They are Not in Common.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


    Thank you said by: RotaxOwner Admin

  • Re: High EGT's and low RPM

    by » 6 months ago


    Now that page 7 is working again...

    The photo is NOT the MAP (Manifold Air Pressure) Sensor.

    The photo is of the Ambient Air Pressure/Temperature Sensor (AAPTS). There is only one!

    You can think of it as an OAT (Outside Air Temp) and Altimeter for use by the ECUs.

    I can not say for certain, but it would be easy enough for the ECU to verify the Pressure Sensor before the engine starts as the AAP and both MAP Sensors withing the AirBox should all have the same reading.

    I know you will definitely get a fault if you unplug it.

    It is probably OK but at least re-seat the connector just for good practice.

     

     


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Bill.Hertzel@Yahoo.com
    Clicking the "Thank You" is Always Appreciated.


    Thank you said by: Paul Depperschmidt

  • Re: High EGT's and low RPM

    by » 6 months ago


    I had the B lane MAP sensor fail in flight. Got the B lane fault light and also had a erratic fuel pressure reading at the same time. Replaced the sensor, all back to normal. When ordering the new sensor I noted that the part number was flagged with the symbol indicating a new replacement part number. I wonder if the original part had a high failure rate causing a new factory run for a redesigned unit.


  • Re: High EGT's and low RPM

    by » 6 months ago


    Bill Hertzel wrote:

    There is an SB concerning the MAP connectors pulling Off of the sensors due to the harness being a little on the short side.

    Rotax made an optional locking clip available to secure the locking bail.

    Make sure the connector is on the sensor and is fully locked.

    Cutting the first Tye-Wrap in the Wire harness upstream of the connector will produce some slack.

    Replace the Tye Wrap but leave the sensor cable free of the bundle.

    - - -

    There are 4 sensors on the AirBox.

    One Air Temp and One MAP feeds the Lane "A" ECU.

    One Air Temp and One MAP feeds the Lane "B" ECU.

    They are Not in Common.

    I do have clips on my connectors.  But as you say, they are redundant.  So it should not be the cause of my problem unless there were a lane fault.  


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