having looked at peters diagram the egr valve you have , has a permanent power and ground and the computer controls the transistor in the egr which controls the solenoid / pintle.

there is no position sensor in the valve, so not the typical feed back signal we would normally see when the valve opens.

check that the PCM can see the square wave at the computer on pin A19

feed back, EGR FLOW may be calculated by the air flow meter/ map sensor, or some other means

Wiring diagram symbols are not my strongest point, so this post may be a load of rubbish .

i wait too be corrected by some one with more knowledge than me.