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Im not sure if the S14 is the same or different than the S13s EVAP system.
If its the same, here's my 2 cents:
Check the check valve thats on the underbody by the fuel tank.
To make sure its not clogged and opens, you can just disconnect the lines and blow on the vacuum nipple to see if it opens/ isnt stuck closed.
-You can trace the hardline from the engine bay along the side rails to the rear of the car if you arent sure where its located.
If that tank check valve is faulty your evap system wont function correctly obviously.
Seems like you have just about replaced everything else.
Did you do the smoke test yourself or have a tech do it?
Mineral oil works the best in my opinion as it creates the most smoke.
Now as far as the code you have, thats either got to be an issue with that vacuum relay, or the current from the pigtail.
Go buy a chiltons book and a vacuum gun and test all your evap shit. EVAP systems are actually fairly simple, you've either got a problem with vac lines, solenoids, relays, or valve- all of which can be tested mechanically & with air.
I can send you some useful diagrams that may help you. Shoot me a PM if your interested and I'll send you my #.
(I cant ever seem to be able to upload photos on here otherwise Id post em)
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