OAT at -42F???

[gdafoe]

I feels more like 95F in the hangar but just for the first time turned on the D180 in my panel. OAT says it's -42F in there. Preasure altitude is like -4200 feet as well. So I seem to have a problem. I have the new probe with the black band. Wired per instructions following.

""Here's the complete text from the Addendum that ships with all 3-wire EFIS OATs now:

Appendix B in your Dynon EFIS-based product Installation Guide is updated by this Addendum. Dynon has made changes in the manufacturing of your OAT probe to ease the installation process.

Your OAT comes with pins crimped on the 3 wires. Connect these 3 wires’ pins to the following pin numbers on the D9 which plugs into the EDC-D10A.
• Pin 2: Yellow wire
• Pin 7: Red wire
• Pin 8: Blue wire

The exposed shield wires are not strictly required, but may help OAT performance in noisy environments. If you wish to connect the shield to ground, you may splice it into the blue wire or connect it to the EDC-D10A chassis.

You may lengthen or shorten the connections between the OAT and EDC-D10A. Use the provided crimp connectors on the new wire leads.""

Checked it a couple times now and the pins check correct. Any ideas where to look next?

 

[dynonsupport]

First thing to check is the "type" of OAT set in the EFIS. If you have it set to type 1, you might get that result.

Go to SETUP->MORE->OAT and make sure installed is "2"

 

[gdafoe]

Should have noted that in the original post. It is set for type 2 OAT.

 

[dynonsupport]

A pegged low reading like you're seeing can be caused by an OAT that isn't actually electrically connected to the EDC, or of course a failed OAT or EDC. With the power off, what's the resistance between both the red and yellow and the yellow and blue wires?

 

[gdafoe]

With the connector unpluged from the EDC.  Yellow to Red=9.96K ohms and Yellow to Blue=9.22k ohms.

Just checked and I do get the same temp reading with the OAT unpluged form the EDC.

 

[dynonsupport]

So that's about right for 80F. Was that about the actual temp at the time?

One more setup thing to check. Under the EMS side of the FlightDEK-D180, make sure that none of the GP inputs (under the SENSOR setup menu) are set to OAT. This setting will over-ride the EFIS OAT probe setting.

 

[gdafoe]

You got it! The first GP sensor was set to OAT. Thanks.