Spray 4- to 5-quart slow cooker with cooking spray. Place onion in slow cooker. In small bowl, mix dried minced garlic, cumin, pepper, salt and 2 tablespoons of the lime juice to form paste. Pat mixture on top and sides of pork roast (if roast comes tied or in netting, remove before rubbing with spice mixture). Place roast on onion. Top with chiles. Pour enchilada sauce around roast.