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To: flyrotary@lancaironline.net
Date: Sat, 21 May 2005 07:26:53 -0400
Subject: Re: [FlyRotary] Re: EC2 problems (was: More MAP measurement questions)
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From: WALTER B KERR <jbker@juno.com>

  
Dale R wrote:
 I do electronic troubleshooting for a living. Usually, 
when I have repeated failures of a single module it's 
because something else to which it is connected is "eating" 
it. A likely candidate is a sensor that has too low 
impedence/resistence and therefore is passing too much 
current. Less common in recent years is voltage on the 
return line.  It's amazing how dead a component will get 
with as little as -1.5V on a line that's supposed to be 
zero.
-------------------------------------------------------
Amen to what Dale says here John. Tracy replaced 4 chips(A&B twice)
before we fiqured out that there apparently was a bad DPDT switch on one
of the injector disable switches that was leaking voltage back thru a 5
volt computer signal. We never proved this, but when the double fuel flow
line on these switches was eliminated in favor of a single pole simple
switch it has cured the problem todate.

Bernie