EPROM Programming

[David Posea]

Ok, is there only one cell for adaptive fuel. or a table. I ask because I
have found that Ford uses a load vs rpm table (11x9) and stores different
values for adaptive control, based on load and rpm.

David
-----Original Message-----
From: Scot Sealander <Sealand at clarityconnect.com>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: Saturday, August 05, 2000 11:21 AM
Subject: Re: EPROM Programming


>David Posea wrote:
>
>> Ok, it's question time here. Does the GM adaptive control function at all
>> times, or only in closed-loop trying to maintain 14.7:1 A/F?
>
>There are really two parts to this question.  What does it do in
>closed loop and open loop.  The feedback part that actually changes
>the BLM is only active when the AFR is at stoich. This is because the
>feedback device (the O2 sensor) only functions properly at that AFR.
>This mode is closed loop.
>
>When at WOT, the ECM goes open loop and is no longer at stoich AFR.
>It is in open loop, even if the scan tool still says it is in closed
>loop.  Once on, GM usually never shuts off the closed loop flag unless
>the O2 sensor dies.
>
>Now does the ECM use what it has learned from O2 feedback at WOT, or
>open loop mode?  Yes. They all add fuel if learning has told it to
>add fuel.  Most, but not all, will not let the code remove fuel if
>in PE, and it has learned to remove fuel.
>
>You can change BLM boundaries so that the ECM will not learn in
>the BLM cell used at WOT.  So then, when in WOT, the fuel will not
>be altered from the normally calculated value.
>
>Good advice is to know your cal...
>
>Scot Sealander
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