Uh, I seemed to have missed something in this discussion What is a/the
PWM? It just doesn't come to me.

Thanks,

John

On 11/15/2013 10:03 PM, Brett Ne wrote:
> GoWesty emailed back and declined to share their information, citing "that
> data is proprietary".  It really isn't, just as knowing the expected output
> voltage range of a healthy voltage regulator isn't proprietary.  Oh, well,
> it was worth a try...it just means a little more work on our part.
>
>
> So, here's what we need to know:
> * The PWM duty cycle being feed to the idle air valve when:
>       --the engine is cold, the starter is engaged, and the coil is shorted
>       --the engine is cold & running
>       --the engine is fully warm & running
>       --the engine is fully warm & running with PS operating
>       --the engine is fully warm & running with AC on
>       --the engine is fully warm & running with PS operating and AC on
> *  The current draw from the idle air valve at a known duty cycle.(or feed
> it straight 12v and measure the current draw.)
> * The base voltage and the peak voltage coming from the Hall sensor
> The above items will need to be done by someone with a scope and a healthy
> ICU & idle air valve(and PS & AC).
>
> *  Which connector, 4/ST2 or 11/ST1, supplies the PWM power to the idle air
> valve. (and confirm that whichever supplies the PWM power, that the other
> is a ground connection.)
> *  What is the voltage at the coolant temperature sensor when cold and when
> 160 F.
>
> I think that this would provide all the information needed to design the
> circuitry and program the microcontroller to drive the idle air valve.
>
>
>
> And once a prototype is built, we will need a vict-- I mean volunteer-- to
> connect it to their rig for testing & fine tuning.  Preferably in the
> Portland, OR area.
>
>
> --
> Brett in Portland, OR
> "Albert" '82 VanFox I4 Riviera
> .
>