3.9k Ohm Diagnostic mode on a P4.

[Bruce Plecan]

> Bruce Plecan wrote:
> > Then for a while this was the mode that when done on the assembly line,
that
> > the EPA demanded that the car be recorded in.  What the policy is now
for
> > the new car recordings is now I haven't a clue.
> That's strange!  AFAIK, only GM has an analog limp home mode.
> As to the 3.9K mode:  In a well designed product, there needs to be a
> way to test every "feature".  Without this mode, it would be very hard
> to detect a failed netres, or an incorrect netres.

This is the info put out at a GM Corp Training Center.
I don't have a clue about how any others satisfy what the EPA wanted to
record about their systems.  And this is 20 years later.  Early stuff might
have been just for statistical data, for who knows what.  The whole
EPA/Gummit/manufacturers,  I dunt want to was at full bloom also.
Bruce

> Ludis Langens                               ludis (at) cruzers (dot) com
> Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/

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