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Date:         Fri, 15 Nov 2013 20:03:04 -0800
Reply-To:     Brett Ne <brettn777@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Brett Ne <brettn777@GMAIL.COM>
Subject:      Re: Arduino and Vanagons
In-Reply-To:  <CAO+Ycs+=iyp0jX5s35AhoiLBTX+a6J6cjRkAmZS3LYaerjcKbw@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

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


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