VSS & 730 ECM

[David A. Cooley]

Mike,
Might want to run the VSS signal into a flip-flop set up to multiply by
2.... have it trigger the flip flop giving 2 pulses for every input.
Later,
Dave

-----Original Message-----
From: Mike Hoenes <MHoenes at dhr.state.nc.us>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Wednesday, September 16, 1998 10:06 AM
Subject: VSS & 730 ECM


>I'm putting a TPI on my 355ci 85 S-10.
>I have poured over the archives and cant find an answer to this question.
>
>How can I get a 730 ECM ( 91 F body automatic chip) to use the input from a
>2000ppm VSS (tapping into the output from the solid state VSS used by the
>cruise control).  Near as I can tell, the F body program uses a 4000ppm
>signal from two inputs ( hi & lo) rather than a 2000ppm single input.
>I read that there is a select indicator, but no specifics were given about
>which byte to change.  Which pin is used for the 2000ppm input to the ECM?
>
>Any alternatives beside getting a 4000ppm VSS  would be helpful.
>
>Thanks!
>Mike
>
>
>