I have been intermittently experiencing a sensor fault with the pressure/temperature sensor in the intake manifold, part number 874 654.  Initially I thought the connector was loose as I found it to be not fully seated.  However, the fault continues intermittently. 

For what it is worth, I've coincidently discovered that the fault is most prominent when reducing throttle during a decent.  It is rare to see the fault occur during cruise and I have never experienced it during  WOT or near WOT during climb.

Resetting Lane-B temporarily resolves the issue but sometimes only for 10 to 20 seconds before re-faulting or sometimes until another flight.  Was just going to replace the sensor but wanted to run it by the forum before dropping $337.




  • Re: Intake Manifold - Pressure/Temperature Sensor Fault

    by » 12 months ago

    Hello Tim

    I do not know the vintage of your iS engine.  In the first few years of production this was a common problem and it was due to vibration of the sensor wire harness where it connects to the sensor itself.  Rotax developed a clip that you can put on the connection to stabilize that area.  See if your engine has both of the MAP sensors fitted with clips as a first step.  There is always a more prominent vibration on throttling back usually as it passes by the peak torque area around 5200 down to 5000.


    37013_2_SI_912 i-014_Introduction of a new clamp part no. 638140 for ROTAX 912 i Series.pdf (You do not have access to download this file.)

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