CIS theory ?
ameer at snet.net
Wed Nov 1 23:05:00 EST 2000
go to p. 25.28. The spec is 80% w/ a temp sensor below 68 degF.
At 12:38 PM 11/1/00, you wrote:
>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.
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