EGR Error codes

[VanCleva]

Hi folks,
My 2.4 90 330 has the flashing glowplug light . The codes are p0409, p0404 and p1631 , all of which point towards the EGR.

I ran live data at tickover and got the attached results. Does this mean the EGR isn't working at all or more likely a vacuum problem ? Any bright ideas where to start ?

Thanks