causes for a non-functioning FV???(4ktq)

[Orin Eman]

> 50% duty cycle I get 0%.  The wire that is supposed to be hot all the time
> is, so aparantly the problem lies in the switched ground wire that the ECU
> uses to control it.  There is continuity in that wire and it has close to
> the spec'd 9.6 Ohms of resistance from the ECU to the FV.  I even tried
> swapping out ECUs and that didn't fix the problem either.  There is a good
> solid ground at the IM (which I'm assuming is the main point where the ECU
> gets its ground) verified by near 0 resistance from a known good ground to
> that point at at the pin on the ECU.  So what gives??!!  What can cause
> the FV not to function?

There is more than one ground to the ECU - pins 34, 18, 6 and 9 at least.
Also make sure pin 2 gets a good ground through the ignition booster
or strange things can happen.

What is the resistance of the frequency valve?  Has it gone open/short?

Orin.