Chris,

The O2 sensor connection to the EM2 should be all you need.  I have an O2
sensor connected to my EC2 pin 28 and can interrogate the EC2 for the O2
sensor data, but my understanding is that the EC2 does not use the O2 sensor
input for any control purposes.  My EC2 always worked the same whether the
O2 sensor was connected to it or not.

Steve Boese



-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Christopher Barber
Sent: Wednesday, July 01, 2009 2:45 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Conflict in read

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

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