Rather than using Pima Canyon Trailhead, parking is often easier to find at the Beverly Canyon Trailhead, and you get to run some very scenic singletrack instead of the Dirt Road
on your way to Mormon, National, and all the other great trails at SoMo. Tacking this onto the beginning and end of the South Mountain Park - East Tour
is highly recommended!
From the Beverly Canyon Parking Lot, go west and a little south. You'll cross a few washes, and eventually face a pretty significant climb to the top of a ridge. From there, it's a short and steep, but very doable descent into Pima Wash, where you'll meet up with Mormon Loop Trail