DIY-WB Output Voltage Scaling

[Len Sabatine]

     Most GM Controllers watch the FP relay voltage , compare it to bat
     voltage , then if there's a wide disparity , will adjust Inj PW or enter
     a Default Fueling mode. This is involved with the running time counter
     as well , in many PCM's. More Gotchas.
     Len

>I was thinking about this but there is one signal that I think we all
>have and *could* be used. The reference voltage from the fuel pump
>relay *may* not be needed as anything other than a display for a
>scanner, not really as a diagnostic input. I'm not 100% certain of why
>the ecm has this input but it could be used to datalog the WB activity
>if it reads it accurately enough. It won't be scaled but at least you
>don't have to look at something while you are driving as a scanner
>will pick it up. Anyone have any thoughts?
>
>Hector
>http://soflaspeed.freeservers.com
>
>
>
> > Sounds like a great idea BUT unfortunately we are all using
>different ecu's
> > and code so it would be hard to do.
> > I like the idea and if we had enough programmers amongst us that
>could teach
> > us how to add code to our respective ecu's
> >
> > Take this a step further and get the table lookup to compare WB A/F
>ratio to
> > a commanded A/F ratio table and then adjust a WB  BLM to achieve
>closed loop
> > A/F ratios at points other than Stoichiometric ?
> >
> >
> > Daniel
>
>
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