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kheindl(at)msn.com
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 Posted: Sat Jul 31, 2010 1:49 pm Post subject: EIS problem identified |
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Ian, Gary, Bud,
Ian was right about the sensors. I used the only consistently wrong value of 10.0 volt with the engine not runnunig as a refernce to work with.
I pulled my 24 pin connector apart, which disconnects all probes, and the volt display was good at 12.5. So now I just had to identify which wire was the culprit.
I used one jumper and connected one wire at a time, until I came to the CHT, which is pin4 on the EIS side. To be 100% sure I cut the wire, reconnected the plug and ran the engine. Everything looks good except for the cht of course.
One more question: Is the faulty part most likely the VDO probe or the two-stranded wire ? The two wires are crimped onto a ring-connector, and are hence shorted. I don't really understand theprinciple, but are the two wires necessary ? Where can I get a VDO probe quickly ? motorcycle or car parts shop ?
The mind boggles at the software in this EIS unit. It scrambled all important parameters. My battery move was purely coincidental.
I think our lives would be a lot more complicated if it wasn't for this forum.
Thanks again for all your help.
Karl
[quote][b]
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budyerly(at)msn.com
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| Posted: Sat Jul 31, 2010 2:31 pm Post subject: EIS problem identified |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> Karl,
I have gone through 4 EIS CHT probes in 5 different aircraft. They are a bit flimsy in my opinion. That unwanted opinion forwarded, I have always found it wise to replace the CHT ring. Write to Sandy at Grand Rapids and they may even send you one at a significant discount. The VDO probe sensor (single wire) is Rotax proprietary (because of the thread) and is swapped with any of the other VDO probes for testing. The two wire probes (the CHT ring that is held in place by the VDO sensor tight against the head) I believe is a type J thermocouple. As the ring heats, the resistance in the probe changes (magic) and is read by the magic box. If the ring shorts, it sends improper voltage back to the EIS and the box is very unhappy.
I am confused at your pin 4 comment, as as that is Red CHT #5 from the thermocouple. #19 on the other plug is your water temp sensor wire.
It is amazing what one bad voltage input will do to our magic black boxes.
Hope I am not confusing you.
Bud
[quote] ---
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kheindl(at)msn.com
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| Posted: Sat Jul 31, 2010 5:03 pm Post subject: EIS problem identified |
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Bud,
I am just a little bit confused. Should I order a type J thermocouple from Sandy ? And the VDO ? It is a German make rated at 150C with the appropriate thread, I think 10mm.
My original notes have pin 4 white and pin 17 red for cht no. 1. I had an early EIS, so maybe Grand Rapids made some wiring changes since then.
For coolant I have white/brown on pin 24.
Karl
From: budyerly(at)msn.com
To: europa-list(at)matronics.com
Subject: Re: Europa-List: EIS problem identified
Date: Sat, 31 Jul 2010 18:29:56 -0400
.ExternalClass .ecxhmmessage P {padding-bottom:0px;padding-left:0px;padding-right:0px;padding-top:0px;} .ExternalClass BODY.ecxhmmessage {font-family:Tahoma;font-size:10pt;} Karl,
I have gone through 4 EIS CHT probes in 5 different aircraft. They are a bit flimsy in my opinion. That unwanted opinion forwarded, I have always found it wise to replace the CHT ring. Write to Sandy at Grand Rapids and they may even send you one at a significant discount. The VDO probe sensor (single wire) is Rotax proprietary (because of the thread) and is swapped with any of the other VDO probes for testing. The two wire probes (the CHT ring that is held in place by the VDO sensor tight against the head) I believe is a type J thermocouple. As the ring heats, the resistance in the probe changes (magic) and is read by the magic box. If the ring shorts, it sends improper voltage back to the EIS and the box is very unhappy.
I am confused at your pin 4 comment, as as that is Red CHT #5 from the thermocouple. #19 on the other plug is your water temp sensor wire.
It is amazing what one bad voltage input will do to our magic black boxes.
Hope I am not confusing you.
Bud
[quote] ---
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