_ _ ( ) ( ) | |/'/' | , < | |\`\ (_) (_)
## ## ## ## ## ## #### ##
__ __ \ \ / / \ V / > < / . \ /_/ \_\
### ## ## ## ## ## #### ## ## ## ##
#### # # # # # # ####
IMPORTANT: enter the case-INsensitive alphabetic (no numbers) code AND WRITE SOME SHORT summary of changes (below) if you are saving changes. (not required for previewing changes). Wiki-spamming is not tolerated, will be removed, so it does NOT even show up in history. Spammers go away now. Visit Preferences to set your user name Summary of change: = Idle Air Control = The early type is a simple solanoid which allows a vaccum to pass to a set of bellows that move against the throttle plate stop. Most people remove these when going to a stand-alone system, as they do not work very well after 25years of service. The newer 20v engines have a two coil IAC (marked as A in this diagram) http://vems.hu/www.vems.co.uk/VEMSInstalls/4AQuestion.jpg One coil opens the IAC valve, the other closes it, with neither coil active the IAC valve sits at 50%. A simple solution is to use a Relay to ground one coil or the other http://vems.hu/www.vems.co.uk/VEMSInstalls/IACRelay.png http://vems.hu/www.vems.co.uk/VEMSInstalls/IACRelay.jpg In order to PWM the solanoid for the best results a FET driver with one inverting and one non-inverting output (such as the TC4428) may be used: http://vems.hu/www.vems.co.uk/VEMSInstalls/ToyotaIACController.png ---- I guess it's very similar to the ones on BMWs (dual solenoid) with an extra pre-set spring. However selecting the dual-solenoid iac option in newer (>1.0.30) firmwares might control this valve without extra electronics. Optional: Add document to category: Wiki formatting: * is Bullet list ** Bullet list subentry ... '''Bold''', ---- is horizontal ruler, <code> preformatted text... </code> See wiki editing HELP for tables and other formatting tips and tricks.