Kavlico Oil Pressure Sensor

[BigJohn]

I was wrong, Joe is right.

[Mich48041]

rv3flier,
The wire colors all sound correct to me. You said that the black Kavlico wire connects to a black aircraft wire. Confirm that you are referring to the manifold pressure black wire.
Inside of Van's control board, a 200 ohm resistor is connected between the white/yellow wire and ground. That resistor is likely the cause of the erroneous display. I would bypass Van's control board and connect the Kavlico green wire directly to the D-180 EMS pin 6.
Another way to accomplish that is to remove the two white/yellow wires from the control board and splice them together.
One white/yellow wire connects to pin 15 of the firewall D-Sub on the control board.
The other white/yellow wire connects to pin 22 of the EFIS D-Sub on the control board.
Remove (or cut) those white/yellow wires where they connect to Vans's control board and splice them together. Doing that will connect the Kavlico directly to the D-180 EMS pin 6.

[Mich48041]

See Dynon DOCUMENTATION and notice that no resistor is shown in the wiring diagram.

[RFSchaller]

Joe, you are scary smart! Thank God you're on our side!😝

[Dave12]

Originally Posted by RFSchaller

Joe, you are scary smart! Thank God you're on our side!😝

I refer to him as the "Master Thinker"!

[Mich48041]

Wait until rv3flier gets his oil pressure working before heaping on the praise. When I first got my D-180 system, I took the cover off from the control board and followed every circuit trace and made a schematic. That knowledge enables me to help others.
I do make mistakes though. I was wrong about the internal spring of the engine driven fuel pump and Mike Miller was right. Don't tell my wife.

[Dave12]

Originally Posted by Mich48041

Wait until rv3flier gets his oil pressure working before heaping on the praise. When I first got my D-180 system, I took the cover off from the control board and followed every circuit trace and made a schematic. That knowledge enables me to help others.
I do make mistakes though. I was wrong about the internal spring of the engine driven fuel pump and Mike Miller was right. Don't tell my wife.

He is the "When he talks, people listen" guy and always a gent!

[rv3flier]

Yes, I spliced into the black ground wire from the manifold pressure sensor. Since I didn't build the aircraft and didn't do the original wiring -- I'm "flying by the seat of my pants." It may take me awhile to figure out/locate Pin 6 on the EMS to connect it directly. I assume (always a dangerous thing to do) that the original Honeywell sensor used the resistor from Van's control board and still used the white/yellow wire as the output from the sensor to the EMS.

Thanks for the additional information and support.

John

[rv3flier]

I found three (3) WHT/YEL wires. One from the Kavlico to ELW EDW 25 pin D sub going into the control board (pin 15?). One from the EFIS control board to the 37 pin D sub EMS (pin 22?) and one going out to the fuselage. The only documentation I can find on that is that it goes to the serial plug - USB port for updates. However, the wiring shown for the serial plug only shows yel, org, and black???

Assuming that the resistor is on the control board itself, I need to cut the WHT/YEL wire going to the ELW EDW and splice it to the WHT/YEL coming from the EFIS control board to the EMS correct? This would bypass the ELW EDW in and the EFIS control board out just leaving a direct connection to the EMS - presumably pin 6.

Awaiting final confirmation before I cut and paste!

Thanks

John

[Mich48041]

You lost me with ELW & EDW and all of those pin numbers.
You assume correctly that the resistor is on Van's control board and the signal out from the oil pressure sensor should NOT connect to the Van's control board. Pin 6 on the Dynon EMS should NOT connect to Van's control board either.
The green oil pressure sensor wire should connect directly to pin 6 of the D-180 EMS. No other wires should tap into that. It does not matter how you accomplish that. You can run a new wire or you can cut and splice existing wires. Just make sure there is no tap going to Van's control board.
There is really only one pin number to be concerned with: Pin 6 of the D-180 EMS. Connect that pin to the sender green wire and to nothing else.
There is a red/white tool that came with the kit. That tool is used for removing D-Sub pins and sockets. Stein also sells that tool. Instead of cutting and pasting, another option is to remove pin 6 from the D-180 EMS D-Sub connector and insert a new wire with a new crimped pin in its place. That D-Sub tool requires some practice to master. Sometimes it is frustrating and sometimes you get lucky removing pins.