I pulled the EGR off, cleaned it and checked it didn't appear to be blocked or siezed which it wasn't.
Measured resistances at pins with Autodata diag but with no values but seemed reasonable at 3.3ohms for the motor and 4.6kohm to 1.3kohm when opening and closing valve.
I next cautiously removed the plastic cover over the gear train etc and found the problem.
The motor pinion drives a large gear which has a smaller gear also moulded to its underside, in turn driving the actuator shaft though about 90 degres. However 3 teeth has sheared off the drive gear!
I noted that the drive gear only moves about 270 degrees to open and close the valve. By removing the drive gear and replacing it about 4 teeth further around to before it now operates ok and will able to be done so in future if it re occurrs!
A new one is about A$1000-00 and is ex France for us in Oz. However Renault did say it has been subject to numerous supercesessions so maybe its been modified. However the motion seems quite violent to me by ear anyway, maybe the control software drives it too hard into the mechanical stop when closing, who knows! Given an EGR valve doesn't need to operate all that fast I'm a bit suprised, then again its Renault.
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