In a small bowl: mix all the seasonings together.
Rub the seasoning mixture all over the pork.
Place the roast in the cooker. Add the onions, garlic, celery, carrots and water. Place the lid on.
Pressure cook on high for 20 minutes and natural release for 10 minutes. Remove the lid.
Remove the roast and place it on a plate. Wrap with aluminum foil and set aside.
In a large bowl: place a mesh/strainer on top. Pour the vegetables and broth into the bowl. Reserve the broth for gravy and the vegetables to eat.