Siemens EGR Valve. Test voltages, data. 1.9 DCi

Hi, Can anyone give me the expected voltages/data for a Siemens EGR valve on a 2006 Megane 1.9 DCi 130hp. (not Piersburg).
As the 12v feed comes from the ECU, (not a fuse directly) should it be constant or fluctuating?
What circuits share the 5v reference? I only have 1.5v.
Fault code P0486 EGR Sensor B circuit.
Also how do I know if its a 804 or 814 etc.

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Siemens EGR Valve. Test voltages, data. 1.9 DCi