I have a code on the ecu for an open circuit on the egr electrovalve.

I have followed a previous thread of checking where the valve is and replaced it. But the code is still there and Iv'e checked the wiring back to the ECU and also the PMA 1 noir connector in the fuse box. From there I can't really read diagrams on peugeot web site as they are a wee bit complex.
Fault produced is anti pollution
Car is 53 plate RHS 90 307 sw. This is purely electrical or something else in the circuit is not doing its job to provide power to the valve. so any suggestions or is it off to the peugeot dealer for investigation?