You've read everything on Jim's CIS primer, right?
https://jimsbasementworkshop.com/CIS/pages/test_troubleshoot.html#TS_chart
So I had a similar problem, could not get my fuel pump to turn on with I turned the key, you can sift through here (lots of good electrical troubleshooting of the CIS system)
http://forums.pelicanparts.com/porsche-911-technical-forum/1128356-fuel-pump-wont-come-no-ground-85-a.html
It wound up being a connector near the fuse area.... unplugged it, plugged it back in, works now.
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Last edited by ADDvanced; 05-12-2023 at 08:39 AM..
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