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'''IAC''' This is a 3-pole solenoid. I did some measurements to it: '''Resistance''' between pins: (1)--- 20ohms ---(2)--- 20ohms ---(3) (So there are 40 ohms between pin 1 and 3) Without connection it's opening can be changed by rotating or shaking the solenoid. (Guess there's no "default" position) I can '''close the valve''' by applying GND to pin1, and +12V DC to pin2 OR pin3. I can '''open the valve''' by reverse voltage. (+12V DC to pin1 and GND to pin2 or pin3) There's no movement when I apply voltage between pin2 and pin3 in any direction. Motronic's idle-setting voltage on pins was +2V, +8V, +9V with DC measurements and ~twice higher at AC with a cheap DVM (guess these are pwm signals so those above are far not accurate values). NOTE ! "Original" wiring is as follows... Pin 2 -> 12V supply. pin 1 -> to Motronic ECU pin 22 (white-green) Pin 3 -> to Motronic ECU pin 4 (white-yellow) ---- I have the stock idle air solenoid: http://quasar.dynaweb.hu/~lezsi/bmw/original/PICT0006-idle-solenoid.JPG ---- But system has an '''EVAP purge canister valve''' (said 'auxiliary air control' earlier): http://quasar.dynaweb.hu/~lezsi/bmw/original/PICT0011-some-air-solenoid.JPG I'm not sure whether this is part of current motronic config or it comes from some jetronic system. Harness is connected however. '''options''' * leave it out and block its connection from throttle body. * or you can control it from GenBoard. A purge canister can trap significant amount of gases (useful in the engine, unwanted in the athmosphere unburnt) escaped from the tank on a hot summer day (such as today). ** resistance is 46 ohms. This might be a useful idea, but has low priority at the moment :) ** actually I used the drill in throttle body for [http://quasar.dynaweb.hu/~lezsi/bmw/conversion/iat.jpg IAT]
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