7747 hiway spk/fuel mode

[Programmer]

What do your AFR's end up at ??

Lyndon.
----- Original Message -----
From: den Broeder, Ernst <edenbroe at cisco.com>
To: <gmecm at diy-efi.org>
Sent: Wednesday, January 24, 2001 7:43 AM
Subject: Re: 7747 hiway spk/fuel mode


> Bob,
>
> Lean cruise is working now.  I had to apply the esc_done patch to get it
to
> work.  Awesome job!
>
> The O2 cross counts is another variable that could be checked to make sure
> the ECM is in lean cruise mode.
>
> Thanks,
> Ernst
>
>
>
> >Ok, just checked some of this stuff out. When in hiway mode, learn
> >on the aldl is off. The mpsi 9000 scanner also showed open loop mode
> >(this may vary depending upon which status bit the scanner uses).
> >
> >When the knock test is done, yes, knock counts will show up on
> >the aldl.
> >
> >Yes again, the values at 0xD54A are used for the knock/ESC test.
> >The ESC 43 test is actually a 2-parter. Knock is forced, along with
> >run-away knock checked for.
> >
> >The hac has some errors in the comments of these test variables:
> >
> >d54a & d54b together is the eng run time prior to test.
> >d54d is the retard degrees when either ESC 43 test fails.
> >
> >If you haven't also added the esc_done patch, you may want to. This
> >patch sets the 'esc test completed' bit. This allows PE spark and
> >hiway mode to be operational without the ecm having to force knock.
> >Note the side effects of the patch: The coolant window and time
> >delay for PE spark are also bypassed.
> >
> >BobR.
> >
> >
> >den Broeder, Ernst wrote:
> >
> > > I've been playing with the hiway747 patch, and I'm not 100% sure if my
> > > calibration is actually even entering this fuel mode.  Is the O2
sensor
> > > value going towards ~100mV the only indication that the ECM has gone
into
> > > lean cruise or will the 'learn control enabled' bit in the ALDL stream
> > > change accordingly as well from enabled to disabled?
> > >
> > > Are the values at 0xD54A the only factors used to determine whether
the ESC
> > > test is done or not?   And will I see the knock counts increase on my
ALDL
> > > scanner when this test is done?
> > >
> > > Thanks,
> > > Ernst
> > >
> > >
>
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> >
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