| Subject: | Re: 2.1 Electronic Idle Control valve |
| From: | John Bange |
| Date: | Thu, 6 Mar 2008 22:40:08 -0800 |
> The idle control valve is normally closed. When the idle speed goes below > the set point, the ICU sends pulses to the valve to open it. The duration > (duty cycle) determiens how much it opens bypassing the throttle to give > more idle speed. So it's just pulse-width modulation at 0 and 12 volts? I'll have to pull out my 555 timer chip project board and see if I can make it do something... -- John Bange '90 Vanagon - "Geldsauger"
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