Spray grill rack with nonstick spray and prepare barbecue (medium heat). Sauté sausage and onion in heavy large saucepan over medium-high heat until onion begins to brown, about 8 minutes. Add tomato sauce, vinegar, sugar, 2 teaspoons chili powder, and 1 teaspoon cumin. Bring to boil; remove from heat.
Meanwhile, sprinkle chops on both sides with salt, then chili powder and cumin. Grill chops until cooked through but not dry, about 9 minutes per side.
