On Sun, May 17, 2020 at 12:21 AM Steven Mills <lefthanddrive123@gmail.com>
wrote:

> Idle control valve does not vibrate/hum but will open/close on bench test.

 So -- valve is good but system is not operating.

> So, my question centers on whether or not the ECU can partially function
> but still be dysfunctional as to the idle. Any thoughts/ideas would be
> appreciated.
>

The ECU does not control the operation of the ICU.  If the valve does not
hum at key-on (or when the fuel pump runs in late models) then either the
ICU or its wiring is bad (since the valve is known good).

Yrs,
d

>
> Sent from my iPad