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Date: Wed, 01 Jul 2009 03:44:57 -0500
From: Christopher Barber <CBarber@TexasAttorney.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Conflict in read
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Another question that may be more suited for Tracy (but I hate bothering 
him ever and I still hope to make progress while he is away), however, I 
was re-reading both the manuals for the EC2 and EM2 and looking at the 
pin out sections for the d-sub connections.  I noticed that for the EC2 
it shows pin 28 being for the O2 sensor, however, in the EM2 Manual it 
shows pin P2-8 as also being for the O2 sensor. 

Currently mine is only hooked up the the EM2 P2-8 pin. I do not ever 
recall that there should be two O2 sensors installed and I was under the 
impression that you would not have two leads off of one sensor to two 
different instruments.  So, what line of text did I miss (not unheard of 
and one of the reasons I keep re-reading the manuals....as I experience 
more, some of the stuff makes more sense with an additional reading even 
though I doubt I will ever "get" the calibration stuff...sigh) about 
where the 02 sensor should be connected to. Is it preferred to go the 
the EM of the EC....or do you have a two wires from 02 sensor, one to 
the EM and one to the EU....or something else all together? 

Thanks.

All the best,

Chris Barber
Houston