Hi,
There is an EGR vacuum regulator solenoid (pic 1 below). It is a simple on or off switch. It should have two wires to it. The PCM regulates the vacuum it allows to reach the EGR valve. If you have vacuum, that isn't the likely cause. As far as testing, disconnect the electrical connector and apply 5v to the connector pins to see if you hear it moving internally or allowing and then stopping vacuum.
If you have a bi-directional scanner, you can actuate the sensor via the scan tool.
Also, there is a differential pressure feedback EGR sensor (DPFE). See pic 2. This sensor converts a varying exhaust pressure signal into an analog voltage which is digitized by the Powertrain Control Module (PCM). That information is then used to determine EGR flow.
If you look at the last pics, it is an exploded view of the system. I copied and pasted how it operates in the very last pic.
Let me know if this helps.
Joe
See pics below.
Images (Click to make bigger)
Wednesday, July 31st, 2024 AT 8:09 PM