I switched both fuel and oil pressure senders to Kavlico. I changed the fuel pressure last year due to inconsistent reading with the VDO sender. The readings from the Kavlico were consistent but did not seem entirely accurate. Last week, I saw very high oil pressure readings at throttle and idle on my 80 hour old Superior engine. Given the high failure rate of the VDO sensors, I decided to change out the oil pressure sensor. After hooking the new sensor up, I was greeted with a red "---" on the screen. I then checked the voltage to the units; 4.4 volts. I turned the unit off and on several times and continued to see 4.4 volts except for one instance when I saw 5.0. During all testing, both units were unplugged. The units share common 5+ and ground. Both grounds were power and ohmed tested and passed. The fuel pressure sending wire (green on sender) is showing 4.4+ volts also. The oil pressure sending wire (green on sender) is not showing any voltage. The unit is running version 5.5.0. Please advise.
Troubleshooting new sensors
- Thread starter CURLY
- Start date
jakej
Well-Known Member
Did you reconfigure the system for the Kavlico sensors ?
" I then checked the voltage to the units; 4.4 volts.
" - which wire ?
Where did you connect the red wire on each sensor to ?
"During all testing, both units were unplugged". - volts testing, correct ?
" I then checked the voltage to the units; 4.4 volts.
" - which wire ?
Where did you connect the red wire on each sensor to ?
"During all testing, both units were unplugged". - volts testing, correct ?
Yes, the unit was reconfigured for the Kavlico sensors.
4.4 voltage was from the 5+ volt EMS out pin.
Each red wire was connected to the same 5+ volt EMS out pin.
"During all testing, both units were unplugged". - volts testing, correct ?
To clarify - I unplugged both sensors from their wiring harness and then measured the voltage out to the sensors from the EMS, tested continuity on the ground and tested for power on the green (sensor out to EMS wire).
4.4 voltage was from the 5+ volt EMS out pin.
Each red wire was connected to the same 5+ volt EMS out pin.
"During all testing, both units were unplugged". - volts testing, correct ?
To clarify - I unplugged both sensors from their wiring harness and then measured the voltage out to the sensors from the EMS, tested continuity on the ground and tested for power on the green (sensor out to EMS wire).
jakej
Well-Known Member
Sorry Curly, I've been preoccupied & Dynon may have been too after Sun nFun.
Your last sentence - something's up here, if you see volts (4.4) on the green wires ( with sensors disconnected) that doesn't make sense.
Did you use the Dynon EMS harness ? Made any modifications to it ?
Hopefully DS will chime in soon & help too.
Your last sentence - something's up here, if you see volts (4.4) on the green wires ( with sensors disconnected) that doesn't make sense.
Did you use the Dynon EMS harness ? Made any modifications to it ?
Hopefully DS will chime in soon & help too.
Much of our staff has been at Sun-n-Fun and Aero Friedrichshafen - thanks for your patience. Also, note that although we try to keep up with the community conversations here, know that our primary one-on-one technical support is available via either phone or email - 425-402-0433 and support at dynonavionics dot com.
I don't have an immediate answer here - I'm going to need to to get some thoughts from our engineering team on this.
If you're only getting 4.4V from the 5V wire, that would definitely cause issues. But first, disconnect ALL sensors from that wire, and then check its voltage. What do you see in that case?
I don't have an immediate answer here - I'm going to need to to get some thoughts from our engineering team on this.
If you're only getting 4.4V from the 5V wire, that would definitely cause issues. But first, disconnect ALL sensors from that wire, and then check its voltage. What do you see in that case?