Does the valve lift when you rev the engine between 2000 and 4000 RPM? That's the first step to see if the valve is working, and that it's getting a signal! If it's not, then I'd run this test the online mechanic recommends - if the valve lifts, then don't worry about this test. Also, does your engine choke down or at least idle very slowly if you manually push the valve upward at idle? If not there's an obstruction somewhere (perhaps at the other end of the EGR tube where it bolts in to the exhaust).
Keep in mind that you can get the factory service manual at
www.nissan-techinfo.com for $19.99. How you ask? Sign up for the one day "viewing" subscription and then I've been told you can download the entire document as a .pdf file to your computer. It's best to have a high-speed connection for that as I've heard it's slow even with a cable modem, so I wouldn't try it with dial-up.
The online mechanic is calling the ECM (computer under the passenger seat) a PCM for whatever reason. That's one thing about cars - nobody knows what to call all of this new fangled emissions stuff. I've seen the junk yards just call it the "brain box" - real sophisticated
- the EGR-CV is the solenoid. He's right on with the pin numbers and wire colors as compared to my factory service manual.
Heath