EGR issues on 2004 Hyundai Santa Fe 3.5

TLDR: Should I have 12V at the EGR solenoid at various different RPM's (in Park)?

I have a a friends 2004 Hyundai Santa Fe 3.5 that originally had an EGR stuck open code and ran bad. We replaced the EGR (which was indeed stuck open) and the car runs good now but we're getting a P401 Low EGR Flow code. 

With the car running I can apply vacuum to the EGR and get the car to stumble (while also visually seeing the EGR work), which shows to me the EGR is working. 

Also with the car running I can apply 12V to the the EGR solenoid (with the connector unplugged) and the car stumbles and dies, showing me that the solenoid is working. 

I DON'T get 12V at the solenoid connector under any conditions. I'm measuring between the two connector pins. I've tried multiple RPM scenarios and constantly have no voltage.

So that leads to my question. Should I be getting voltage there by just playing with RPM in park? I'm prepared to leap to either a wiring issue or a PCM issue, but I'm worried that I'm not putting the car into an "open EGR" scenario.

Can anyone shed some light on that for me? 

P.S. I'm unable to get my scan tool to connect other than generic OBD2 so I don't think I have command of the EGR through my tool (let me know if I'm wrong).

Thanks!

I would check the EGR passage on the intake manifold side of the EGR valve. If it is restricted with carbon, it can set an Insufficient/Low Flow code.

I'm convinced the EGR flow is OK since I can easily get the car to stumble or die when I manually open the EGR with a vacuum pump or command the solenoid closed, which opens the EGR. I 

I found a wiring diagram for the 2.4L and it shows what I'm pretty sure is constant power to the solenoid and a ground side switch at the PCM.

At this point I think I just need to measure for 12V at the solenoid instead of across the solenoid then I can go from there, but I'm still interested in my original question, which is should the EGR ever be commanded open while revving the engine in park?

Thanks

I'm still interested in my original question, which is should the EGR ever be commanded open while revving the engine in park?

To my knowledge, no. But, that is not to say that I am familiar with Hyundai's EGR strategy, specifically.

I DON'T get 12V at the solenoid connector under any conditions.

I just looked at the schematic and you should have power on the blue wire at the solenoid connector when the Engine Control Relay is energized. In the engine compartment fuse box, be sure that ECU Fuse 3 (10 amp) has power with the with the Key on/Engine running.

 

I'm measuring between the two connector pins.

Put the negative lead of your volt meter on the negative battery post. Then check the voltage on each of the connector wires, individually. The power wire (blue) should show battery voltage. The ground wire (blu/org) will show battery voltage, (with the solenoid connected) when the solenoid is "OFF"/ NOT energized and should be very close to zero, when the PCM commands the solenoid "ON".

Thanks, yeah that's exactly what I planned to do next time I have access to the car.