Lane B light on take off

Hi all

First, the computer does not check fuel pressure, it calculates fuel flow by the pulses of each injector.  Any fuel pressure readings are something set up by the OEM and the instrument supplier.  

If you take this to a Rotax tech that has a BUDS reader to download the codes, just like in your car or truck, can see what the issue is.  The lane will give a code that will tell you what is wrong.  Better to do that then speculate all day long, or weeks perhaps.  Best is to contact your distributor and find out who has one near you.  I believe you are in the UK, the distributor is CFS and the contact info can be found on their webpages. 

https://www.cfsaero.com/

Cheers

Yes, BUDS would be the best diagnostic tool, but the FADEC connection to the Garmin G3X does a decent job on simple codes.  In this case it’s telling him he has an oil temp sensor fault.  So a simple visual check of the wiring as Roger suggested is a good start.  Might find a loose connection at the oil temp sensor.  

And Roger, I agree that 20 times unplugging the ECU connectors is a lot in the lifetime of the engine, probably 5 times is even unlikely. I’ve never unplugged mine in 400 hours, but I think folks should be aware so they don’t do it 10 times trying to trouble shoot a single problem.  And it’s still a good idea to log it, or maybe that’s just my OCD?

Hi all

Just a point to clear up a few things on the injected wire harness.  The ECU has a program that has data on 2 different streams.  One is for the instrument connection and one is for the maintenance ports.  While Garman and  Dynon and a few other instruments use the data stream for the instrument to do basic codes they are not the detailed maintenance coding that you get with the BUDS maintenance sidestream.  Indeed Rotax wants the streams split for lane A and lane B, we don't want them connected until you hook up to the BUDS reader.  

In chasing problems I think it is much better to get to the details and save yourself a lot of time just trying things.  All electrical connections have a life limit.  We don't talk about that much but on critical communications systems, for example the ECU, it is important.  it is important enough to remember that the pins are gold plated  and the latching and unlatching will deteriorate the communications at some point.  The life limit has been established by Rockwell Collins at 20 times.  So I agree with Jeff on this one, log it.

Cheers