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Old 10-31-2021, 05:00 PM
amekler amekler is offline
Join Date: Aug 2009
Location: Gilford,NH
Posts: 141
Default Right CHT not working 912ULS

I did my first engine start today. All went except no right CHT.
I swapped the right and left sensors and still no right cht. What should I do next to troubleshoot?
A. Mekler
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Old 10-31-2021, 08:02 PM
Bob Y Bob Y is offline
Join Date: Jul 2017
Location: Piedmont, SC
Posts: 310

Sounds like a connector/electrical issue. Id start wiggling connectors to see if you can find a loose one.
Bob Y - builder 12iS E-LSA
N569TT first flight 2/9/2020
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Old 11-01-2021, 10:11 PM
RFSchaller RFSchaller is online now
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 3,178

Try putting an ohm meter on the pin at the connector to your MFD and the connector forward of the firewall to check continuity.
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Old 11-02-2021, 02:38 AM
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PaulvS PaulvS is offline
Join Date: Aug 2019
Location: Western Australia
Posts: 833
Default No CHT or CHT zero?

Just to clarify: "no CHT", does that mean there is no CHT at all displayed, or is it that there is a CHT but it does not go up when the engine warms up? If it is the former, then check the EMS configuration for two CHTs enabled. Otherwise check for electrical continuity from the sensor connector back to the EMS, as others have said.
Paul vS (yes I'm also a Van)
Building RV-6A #22320 O-320 FP. Wings and tail complete, working on fuselage
Flying my Aeroprakt A-22 STOL and the aero club's RV-9A while I build
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Old 11-02-2021, 05:20 AM
amekler amekler is offline
Join Date: Aug 2009
Location: Gilford,NH
Posts: 141

The right cht display has an X through it.
I checked the voltage at the wire going to the sensors both were 5.0 volts. The left CHT connected and reading normally shows 3.0 volts but the right CHT
only .365 volts. As I said before I swapped sensors so it isn't the sensor.
My thoughts are the problem must be in the wiring to the EMS-200.
This harness came prewired .
Hopefully today I will pull apart the panel and see what's going on .
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Old 11-02-2021, 08:09 AM
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Piper J3 Piper J3 is offline
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,597

Its possible that a pin got pushed back in the D-sub connector. If pin isn't seated well in the plastic housing it can slip when force is applied.
Jim Stricker - EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 750

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father - CFI) - USAAF 1st Lt. Captain B-17H
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Old 11-02-2021, 04:32 PM
amekler amekler is offline
Join Date: Aug 2009
Location: Gilford,NH
Posts: 141

pins in the correct places andcseated
wires intact
both read the same ohms
sensors both work
talked to Dynon-maybe a problem within the EMS-220

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Old 11-02-2021, 08:05 PM
ChuckC ChuckC is offline
Join Date: Apr 2011
Location: Meridian, ID
Posts: 81

After installing software version 16, my Engine Management System (EMS) disappeared. I tried a fix suggested by someone on this forum, and, the EMS came back; except for the right cylinder head temperature (which has a big red X thru it).

Called Dynon and the tech rep put me thru some paces and we found there was no information getting to the CHT-R. Tech suggested switching the left CHT wire to the right CHT to test the right sensor. If that didn't work, then he thought there was a wiring problem.

I did what the tech first suggested and found the right CHT sensor is working fine. I have been looking at the wiring in the engine compartment and can find nothing wrong with the wiring. Then sprayed some electrical contact cleaner on the right sensor and the clip on the end of the wire and wiped everything clean. Have not been back to the hangar to see if the cleaner got the CHT-R operational. If not, I'll look in the avionics bay to see if I can find a wiring problem.

As background, my RV-12ULS originally was partially built with wiring for the D180. Then the nice Skyview came out and I decided to upgrade in mid-build. Van's Aircraft provided a conversion harness. I remember something did not work and Van's tech guys had me move one pin in one of the connectors - everything worked beautifully until this software version 16 came out. Now I am pondering if there is a wire that is bad, or, is there a small group of us with the conversion harness that are having the same problem? And, maybe it is related to the software 16?

Let's stay in contact.
Chuck Carlson
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Old 11-03-2021, 04:42 AM
amekler amekler is offline
Join Date: Aug 2009
Location: Gilford,NH
Posts: 141

I called Dynon yesterday as I see no wiring issues. they want me to send a photo of the sensor debug page. I think the problem lies in the EMS-220. This was my first engine start. Now after seeing your post I wonder if it is a configuration issue
Stay in touch.

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Old 11-04-2021, 06:54 PM
amekler amekler is offline
Join Date: Aug 2009
Location: Gilford,NH
Posts: 141

today I went to the sensor debug page and noticed that right cht was in pin 11 not pin 22 as it supposed to be
called vans and they recommended redownloading the set up files and reinstalling
will try that tomorrow
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