7747 hiway spk/fuel mode

[den Broeder, Ernst]

Cool.  I'll give that other patch a try tonight. Thanks!

Ernst

At 04:59 PM 1/22/01 -0500, you wrote:

>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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