CIS theory ?

[Konstatntin Bogach]

Is this information available in Bentley manual? I could not find it.

Orin Eman wrote:
> 
> > 1. open loop occurs when the engine is cold, unless your O2 sensor is
> > heated [3-wire], and when the WOT switch closes. At WOT the ECU puts out a
> > fixed, pre-determined duty cycle, about 85% I think, but it should be in
> > Bentley. The ECU ignores the O2 sensor input, and keeps it at 85%, giving a
> 
> 65 to 70% usually, depending on RPM.  Boost over a certain value is
> also treated as WOT for this purpose, regardless of the WOT switch.
> Higher values of duty cycle (in the 80% range) occur at startup and
> during warmup.
> 
> > rich mixture for maximum power. I don't know if the ecu is open or closed
> > loop when the idle switch is closed, though.
> 
> Closed loop if the engine is warm enough.
> 
> Orin.