[Webb]

Trying to chase down a last few setup gremlins.

According to Garmin support, configuration is correct and software is updated for G3X and G5. GTN configuration is also correct.

Error message on G3X is ARINC429 not receiving on Channel 2. Wiring checked and pin outs correct from GTN to GAD29. G5 also has error message not receiving ARINC429 data.

Second issue is G3X isn’t seeing G5.

I’m thinking the database in the GTN may be the culprit for the ARINC429 error and no clue on the G5 not recognized by the G3X. Also wondering if these 2 issues are related.

Suggestions please.

 

[mburch]

This is not a problem that would have anything to do with databases, but it sounds like you have problems with both your CAN and ARINC 429 wiring (or configuration). I would address the CAN wiring problems first, using the troubleshooting guide provided in the installation manual.

 

[Webb]

I’ve been through the troubleshooting guide. Most all about ADAHRS and very little on GEA24.

Worked with Garmin support on configuration of the G5, GDU460, and GTN750XI.

Don’t think it’s the CANBUS. LEDs flashing green on the GSU25C, GEA24, GTR20, and GAD29C. The G5 displays the error message at about the same time the G3X does. The G5 is not getting ARINC429 Data. The G3X is more precise specifying channel 2. It takes about a minute for the error message to occur on each unit. There is no LED indicator on the G5 to show communication on the CANBUS but how would it produce an error message about not getting data at same time the G3X does? And the GTN isn’t on the CANBUS.

No error messages about ARINC429 Channel 1 so I’m assuming it’s working. Only channel 2 which is NAV data. Pin out and wiring checked for channel 2 and is correct. Pics are the pins for the GAD29 and GTN connection.

Only red X box on G3X screen is for transponder which is not installed.

The panel is on my bench but has com/nav and gps antennas installed. Even though I’m inside, I get radio transmissions and a GPS fix on the GTN and G3X.

I know the G3X is talking to the GTN. Can control the radio. Have a speaker hooked up and can hear air traffic so audio panel is working.

Garmin says config is right (2 calls and 2 different people).

Checked wiring. Didn’t find any issues.

And of course issue 2 is G3X not seeing the G5. So if CANBUS is working, why doesn’t the G3x see the G5. It is seeing everything else.

Frustrated but hopeful it will get figured out.

 

[Webb]

I may have just found the ARINC429 problem.
Look at the schematic pin out and then the pin out list for the GTN MAPMX.

Could this be the culprit?

 

[bjdecker]

I may have just found the ARINC429 problem.
Look at the schematic pin out and then the pin out list for the GTN MAPMX.

Could this be the culprit?

I don't understand what you're highlighting here. The pin list shown is for P1001, not P1004. MAPMX/CONNEXT rides on RS-232 interfaces NOT ARINC429.

Here's a useful diagram -- note the different connectors (plugs) on the 750xi for Primary System interfaces (P1001) and NAV (i.e. VOR/ILS) (P1004).

 

[mburch]

I’ve been through the troubleshooting guide. Most all about ADAHRS and very little on GEA24.

I'm talking about the CAN troubleshooting guide, which is in section 2.3 of the installation manual. If not all your devices can communicate via CAN, then you definitely have CAN problems. These can often manifest in strange ways such as the type of asymmetric communication you have reported. Fortunately CAN is a very simple interface and easy to troubleshoot, just follow the guidance.

I wouldn't even worry about ARINC 429 until you fix your CAN issues, which are more fundamental.

 

[Webb]

Brian, you are correct and I’m grasping at straws. Matt, thanks for the direction to head. I’m off there next.

I appreciate any and all the help.

 

[bjdecker]

Brian, you are correct and I’m grasping at straws. Matt, thanks for the direction to head. I’m off there next.

I appreciate any and all the help.

Just for grins/giggles what's the "Network Error Rate" on any given LRU?

 

[mburch]

Just for grins/giggles what's the "Network Error Rate" on any given LRU?

Not just this, but also look at the more detailed CAN diagnostic information (as described in the troubleshooting guide).

 

[Webb]

CAN - No shorts to ground. 60ohms between HI/LO and they are not crossed and I double checked the G5 pins since it isn’t getting seen.

Zero % error rates on GSU25C, GEA24, GMC, GAD29C, GMA245R, GTR20.

All communication LEDs showing working network.

G3X System Information:
GPS ARINC429 in 1 is good
VLOC ARINC429 in 2 is good for about 90 to 120 seconds. Then Red X’s out and G5 then show error message as well as the G3X within seconds of each other.

I can’t find an issue with the CAN.

The 2 gremlins that remain are ARINC429 nav data fails on channel 2 after about 90 seconds and G3X doesn’t see the G5.

 

[mburch]

Why not post pictures of all the relevant configuration pages on all your equipment?

 

[Avanza]

G3X installation manual rev AQ pg 465.
CONFIGURATION GUIDANCE.
Do you have a NAV antenna connected to GTN ?
When you updated the G3X to software 9.14, where the G5 and GAD29 powered and CAN-bus connected ?
Check setting for SDI on GTN.

Good luck

 

[Webb]

G3X installation manual rev AQ pg 465.
CONFIGURATION GUIDANCE.
Do you have a NAV antenna connected to GTN ?
When you updated the G3X to software 9.14, where the G5 and GAD29 powered and CAN-bus connected ?
Check setting for SDI on GTN.

Good luck

Nav antenna -yes.
Update - yes to all 3
SDI = LNAV1

Here are some config pics.

 

[mburch]

It would be helpful to see the VOR/ILS configuration on your GTN. The configuration steps involving that page are often missed.

As for your CAN problems, there is additional diagnostic data available: https://vansairforce.net/community/attachment.php?attachmentid=3069&d=1601850652

 

[9GT]

Thanks for this info and link Matt. I am currently doing this very same trouble shooting on my G3X and Garmin avionics. I believe that I have a couple bad servos though, pitch servo shows a steady red indicator and roll servo blinks red,then steady red, then flickers before repeating the cycle.

It would be helpful to see the VOR/ILS configuration on your GTN. The configuration steps involving that page are often missed.

As for your CAN problems, there is additional diagnostic data available: https://vansairforce.net/community/attachment.php?attachmentid=3069&d=1601850652

 

[Webb]

It would be helpful to see the VOR/ILS configuration on your GTN. The configuration steps involving that page are often missed.

As for your CAN problems, there is additional diagnostic data available: https://vansairforce.net/community/attachment.php?attachmentid=3069&d=1601850652

Hmmm, look at the ARINC on the VOR/LOC/GS page. Shouldn’t that be LOW and LNAV1. I changed it and now the GMC is working in normal mode instead of just demo mode.

Also the error message on the G3x disappeared.

Now only the G5 has the ARINC429 error message and isn’t seen by the G3X which shouldn’t be there since it is only connected via the can. And G3x not seeing the G5.

Next step is to disconnect all LRU’s and check CAN from G5 to G3X.

Edit update: Tracked issue down to what appears to be connector on the G5. Matt, you were correct about it being a CAN problem. Although the troubleshooting guide didn’t say to disconnect everything from the CAN, I couldn’t find it until I disconnected everything that was on the CAN including the term resistors. Pin 2 not seeing LO but is seeing HI. I’ve probably wired the lighting protection unit (LPU) incorrectly although it could be faulty which I doubt. More to come…

 

[Webb]

The gremlins are dead.

Matt, I want to thank you and everyone else.

The solder sleeve on the LO CAN was the issue. The LPU wire had slid into the sleeve too far when soldering and had a very poor connection that tested OK when fabricating but came loose during handling and tying up the wire.

Sleeve replaced and G3X now connects with the G5.

You guys are good.

 

[mburch]

Glad you got it fixed, it's usually something simple, just a matter of tracking it down!

 

[dmattmul]

Traffic works on the ground not in the air

After thinking changing the Position Integrity helped turns out it did not. Still shows traffic failure in the air. On the ground traffic seems to be working ok. (Not that I need traffic avoidance while taxing) The G3X in the air traffic works fine. I have a 750 not the xi. This might have changed during the software update on the 45R a few months ago to 2.80. Any help as always appreciated









.

 

[Walt]

The gremlins are dead.

The solder sleeve on the LO CAN was the issue. The LPU wire had slid into the sleeve too far when soldering and had a very poor connection that tested OK when fabricating but came loose during handling and tying up the wire.

Sleeve replaced and G3X now connects with the G5.

You guys are good.

I have repaired a few CAN bus problems due to the use of solder sleeves for wire splicing.
I know some folks will disagree but solder sleeves were never intended to be used for splicing.