1- The FTP (fuel tank Pressure sensor) ,spray electrical contact cleaner in the harness connector, shine a flash light make sure no backed out pins are making poor contact.
2- FTP circuit short to voltage ( check all fuse & do a wiggle test o the wiring harness)
3- PCM circuit to ftp
4- check vacuum hose and do a smoke test ,usually a small leak you can see by eye.
5- sometimes we have to update the pcm with latest software ,(done at dealer if all above are checked and sensor been replaced and vacuum lines are good
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ASE Certified Technician