Speed sensor for 1995 TBI

[Chipsbyal at aol.com]

The late(90 and up) TPI systems don't use a 4KPM(4000 pulse per mile) signal 
for the VSS. The VSS signal goes directly to the ECM which then buffers the 
signal itself and then sends out the conditioned 4KPM to the cruise and 
cluster. These are the speed density systems. If you're using this setup, get 
a converter from www.JTR.com to change from 4KPM to the ac output the ecm is 
looking for. They run about $45.
The 7427 PCM uses the two VSS signals from the DRAC, one for the speedo input 
the other is for trans shift points. Go figure, they both come from the same 
sensor. In 4WD applications there is only one VSS signal and it comes from 
the transfer case.
  This PCM that is in the C1500 always had an electric trans if it had a V-8. 
The manual trans models had a different ECM. It used the 2732c eprom. The 
software from these ecms are very different. Possibly you could use the V-8 
eprom with all the trans DTC's disabled. I need to run an engine similar to 
this on an engine dyno, so I'm already looking into this situation.
AL

www.ChipsByAl.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.diy-efi.org/pipermail/gmecm/attachments/20010118/7587cfa8/attachment.html>