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  • Re: 912 ULS CHT, or CT?

    by » 11 months ago


    Hi Roger 

    Yes. That cable goes all the way back into the Garmin wiring harness as part of the Garmin Glass. I have the G3X touch screens (2 of them). 

    I will replace the spade clips and see what that does.  


  • Re: 912 ULS CHT, or CT?

    by » 11 months ago


    John,

    As others have suggested, start with replacing the female spade connectors at the sensor end.  I’ve had to replace several of these on Bristell NG5s.  I like the spring loaded connectors that Sean posted, but a standard new connector will tell you if that’s the problem.  

    Bristell often labels the CT sensors as CHT sensors. It’s just a digital label problem, and you can re-label it in the configuration menu of the PFD if you like.

    EGT can, in some cases, rise as you unload the engine, such as when lower the nose to descend. It sounds backwards I know, but EGT represents heat energy wasted out the exhaust.  CHT is the opposite, and represents energy being used for thrust. In other words, a heavier loaded engine will typically see higher CHT and lower EGT, and vise versa.  I only bring this up to say you should focus on troubleshooting the CHT sensor first, without being distracted by the EGTs.  

    At the Garmin end, you will find the CT and EGT probe wires terminated at the Garmin Engine Information Module (Garmin GEA-24). From that module, information is sent to the Garmin glass via the Garmin Controller Area Network (CAN).   Specifically, the wires will be terminated on the 25 pin Sub-D connector called out by Garmin as connector J242.  You can download the G3X Touch installation manual and check out section 26.5.2. for the connector pin-outs. However, these connections at the Sub-D connector are crimped pins and are typically quite reliable.

    In one instance I’ve seen a failing Garmin GEA-24 cause erratic readings, but that’s very uncommon.

     


  • Re: 912 ULS CHT, or CT?

    by » 11 months ago


    Hi Jeff,

    Thanks so much for the reply. Yes - I am going to change those Spades first.  I will source some of the spring ones.  That will be the best place to start.

    I will keep you all posted on my progress, as it has been a very annoying little niggle that I would like to get on top of.

     

    Cheers

    John


  • Re: 912 ULS CHT, or CT?

    by » 11 months ago


    John Fleming wrote:

    Hi Jeff,

    Thanks so much for the reply. Yes - I am going to change those Spades first.  I will source some of the spring ones.  That will be the best place to start.

    I will keep you all posted on my progress, as it has been a very annoying little niggle that I would like to get on top of.

    Cheers

    John

    Hi John,

    I see you are just "down the road" at Yass. I have a bag of the spring type spades. If you have a problem sourcing, get in touch & I will send you what you want.


    Thank you said by: John Fleming

  • Re: 912 ULS CHT, or CT?

    by » 11 months ago


    Hi Sean

    Thanks heaps!

    I looked for a Direct Message button, but can't seem to find it.  LOL!


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