It's been very cold < 5 C for my engine starts the last few days. I have had a Lane B light with FADEC error Oil pressure sensor.

The oil temp reads fine for a while say 30 seconds after start, then I get the red cross through the oil temp (on the G3x). The oil pressure readout remains no problem.

If I recycle lane B the oil temp reading comes back fine. Then fails again 30 seconds later. After a second recycle its fine and stable, no problems during flight.

Is this purely down to low ambient temp at startup or do I have a bad sensor ?

Obviously, I have checked the connections they seem fine. The fact that it clears as the engine warms suggests something else. 

What do you think, is this a known issue?

  • Re: Lane B Oil temp sensor error on cold weather start up

    by » 12 months ago

    If once the engine warms up a tad and this fixes itself I'd say it may be just the cold. Let it warm up good before you cycle the ignition to remove the B light. No sense in cycling over and over until it quits. I take it it didn't do this during warmer outside temps? 

    I live in Arizona so we don't get that cold to test a 912iS to see if it does the same thing. Maybe others here in cold country can weigh in that have a 912Is.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

  • Re: Lane B Oil temp sensor error on cold weather start up

    by » 12 months ago

    If the Lane B lamp flashed, there would be an entry in the ECU Fault Log.

    What error does the BUDS Software report?
    An OPEN or a SHORT Sender Fault might be an actual fault.
    An "Out of Range" fault would be more in line with the ECU thinking that there is no way that a running (warm?) engine should ever have 5°C Oil and something might be wrong with the sender.

    I agree with Roger. Let it warm up before resetting the fault.
    If the Oil Temp won't display a valid temp. watch for the Coolant temp to reach >20°C.
    By that time the Oil should be above 10°.

    I have been flying here in Ohio with temp close to, but above 5°C.
    I have not seen an Oil temp fault in my 912is.

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

  • Re: Lane B Oil temp sensor error on cold weather start up

    by » 11 months ago

    If the engine rpm is greater than 2500 and the oil temp is not in the normal range you will get the error that you describe. 

    This is the engines way of telling you you are not in the normal operating ranges and that it thinks there must be fault.

    If this is what you are seeing then adjust the rpm of the engine to stay between 1800 and 2500 during warm up to avoid this fault.  

  • Re: Lane B Oil temp sensor error on cold weather start up

    by » 11 months ago

    @Michael Burton.

    You are absolutely correct. I tried it today at 0C, keeping RPM below 2500 on warm up, no Lane B fault light. 

    If I set the RPM say 2400 it creeps up above 2500 in the first minute. So it needs watching to avoid a fault light. 

    I am a new Rotax owner so a good learning. 

    Many thanks. 

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