Signals

[ECMnut at aol.com]

That's cool stuff Mike.
I was reading in a Mopar FI manual that the OBD2 ECU actually
expects to see the voltage spike from the injector closing,
 or it sets a code for that particular injector, meaning it isn't 
operating correctly..  It could mean that it didn't open in
the first place, so the "spike" from closing would never occur.
Mike V..

In a message dated 3/6/99 11:18:21 PM Eastern Standard Time, mpitts at emi.net
writes:
 
>  I also scoped the injector output.  I could see the spike 
>  from when the injector closed. (What's it called, flyback?)
>  I was able to verify that my PCM is indeed firing the second 
>  unused injector driver on pin A9.  I even hooked an injector 
>  up to it and listened to it click away as the truck engine ran.