I would not touch the EGR valve itself. This should be a sensor or electrical issue. A couple of minutes with your meter will tell you where your issue is.
FWIW, I use a bore brush to clean the EGR (future reference).
as hission50 has already said ,a simple check with a volt meter will tell you....your code is for low volatage,,the egr part is where to start looking,,,,,your pcm works with volts...FWIW your car is old and has been subjected to extreme heat in enginge bay area,,,most of the wiring has to be brittle by now,,,,