Clarifications on last Programming 101+ Dragging it out

[Bruce Plecan]

Subject: Re: Clarifications on last Programming 101
>
> Let me expand on your answer a little so the binarily inpaired can
> understand :)
> FD (Hex) is 1111 1101 in binary. This means from what Bruce has discovered


I DID NOT DISCOVER THIS, a list member shared it with me,  this
is far beyond my mental abilities.

It also is mentioned in the "Net", but ya gotta dig for it.  BTW, I've
mentioned where in numerous postings.  So while alot of what
I write is obvious, ya gotta look real close, for the finer points.
The bits are mentioned elsewhere, and the member explained
the correlation to the error code.  Then I wrote to others to "get it"
again.  This was a matter of digging for months, and writting to
others (many).  And finding others to talk about it.

THIS IS WHY I"M DRAGGING IT OUT, cause it takes a ton,
of time to gather all the snippets, and follow them around.
I'm also following leads on future projects.   This list has
many gifted folks, I just got time to type.

>       this bit ^  at address 050D controls the vss diagnostic.
> F9 (hex) =  1111 1001 and
>    this bit ^  is the knock diagnostic ie 0111 1001 = 79 hex
> 39 (hex) = 0011 1001
>    this bit  ^  is the egr diagnostic ie 0001 1001 = 19 hex
>
>  My hat is off to Bruce (How in the heck did you find this ??)
>
>The question is does clearing these bit(s) disable these
functions or does it just turn off the error reporting ??
>
>Mike D.
>
I've spent a bunch of time being a pest, and writting to folks
trying to get the pieces to the puzzle.  The info in the tuning
stuff I wrote was basically "from my experiences".  Alot (most)
this ecm stuff is from others, hence some errors in my
interuption of things....

Turning the malfunction flags off stops an error code from
being stored, and when the diagnostic test is run by the
ecm and it fails, it doesn't got into the limp home mode.

Some tests aren't run, but some others are (see archives
for the particulars).
  It doesn't turn off the operation of say a egr valve solenoid
apply signal, that is another "switch".
  Another test of say EST still does the momentary addition
of advance to the timing but when the EST reports the knock is present, it's
says OK, or if not present OK, and goes back to
other ecm functions..
  Hope this helps to clarify the clarification.
Cheers
Bruce  Again I have no formal electronics training other than
            at the vocational level, I'm no EE or Software Pro.  I'm
            just sharing what I've found and OTHERS have told me.
            I've tried to verify when possible, all that I've stated.