[Gmecm] C3 mystery? Not so mysterious!

[davesnothereman at netscape.net]

Neat car, Mr. Allen

As you know, the 1226869 ecm is very popular with the Fiero crowd.
Ludis Langens, once a major contributor to this list, was into Fieros 
once upon a time.

There are posts in the "old" archives discussing wastegate coding in 
this ECM.  There are some valid rumors that the Fiero code is probably 
a precursor to the C3 controlled, 1.8 powered Turbo Sunbird, maybe 1986 
or 87 vintage.

Ludis' page... someone here must remember that gem... has (gasp) 
schematics for the 1226869 which have pinouts based on (1) actual study 
of the ecm, and (2) the same boost friendly code found in the Fiero.  
Included in these schematics are callouts for pin A3, listed as Gate, 
and C7, Waste.  Possibly one or both of these pins isn't populated in 
your harness?  If you followed the wiring diagram for a stock 85 Fiero, 
they shouldn't be.  Possibly one of these pins might be the wastegate 
output?

You might want to use an oscilloscope to check.  A test light may not 
respond fast enough.  Then again, depending on the bulb in your light, 
lamp intensity may change with wastegate % duty cycle change.

Don't forget to google "ludis langens page."

Have fun.
Zaphod
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