Hey guys, a friend of mine just bought an early generation P120 and we tried to start it today. When the ECU powers up, the GSU had the "welcome screen" I'll call it, then goes directly to "Error: Temp probe failure" ( I think that's what it said, I just know it was a temp probe failure)

I tried doing a temp probe calibration but when I got to the screen, again it just told me "Error: Temp probe failure"

When I pushed the menu button it goes to the typical screen, but where it would read the temperature it was flashing 108C and -E- back and forth.

We tried unplugging all of the connections, blowing them out and plugging back in to no avail . I called Dean Wichmann who told me to unplug everything from the engine and power up the ECU to see what it said. It now said the exact same thing except the temp was 116C and flashed between that and -E-

Has anyone see this before and is there some kind of ECU reboot that we could try? It is an early version 4.9 ECU (in the soft case) or any other options before it gets sent in to Jetcat?

We'll try phoning Bob Wilcox tomorrow, but thought we'd see if any of the Jetcat guru's here had any idea's first.

Thanks
Jeremy

Sounds like the probe is bad. Another option would be to try a different phone cable between the engine and ECU.

Is the probe user serviceable? It is mounted to the front cover unlike the other engines I have owned.

The probe is like a metal tube with two VERY fine little wires running through it. On the end where it plugs into the PCB at the front of the turbine is where they break. You could possibly re solder the broken wire but they are VERY small and fragile. The good news is that a new Temp Probe is not all that expensive. Jetcat can pre-bend it for your model motor so installation is not too hard. Just be very careful on the plug end not to put too much mechanical stress on it or it could break the replacement also.

Happy Flying,

Steve<br type="_moz" />

Jer, email me a photo of the engine. I have a spare probe from my old 120SX... It might be a drop in fit.

Kelly

In order to replace the thermocouple, remove screw holding the thermocouple to the font of the engine, and the screw holding the fairlead to the exhaust nozzle. The thermocouple plugs into a the circuit board under the front cover. Simply unplug the old, and plug in the new. Re-install the fairlead and the screw at the nozzle.
Go through the recalibration procedure, and you are ready to start the engine.

(Edited to remove "Remove the front cover)...I was wrong about that one....sorry John, thanks for correcting me.

Thanks guys, much appreciated. Kelly, I will have brad send me a picture and I'll send it to you. Thanks again!

No need to remove the front cover.

Remove the 2mm screw on the black plastic base at the front of the engine.
Remove the 2.5mm screw on the tail cone that holds the aft lug the probe goes through.
Carefully pull the black base up and work the probe out of the hole in the tail cone.
Replace just the opposite as described.
Recalibrate temp when you turn the motor on.

Thanks John, to bad it isn't just a standard temp probe with the K type connector, I have a couple of those brand new!

I understand Jeremy.