Heat 2 teaspoons vegetable oil in a large nonstick skillet coated with cooking spray over medium-high heat. Add garlic; sauté 30 seconds. Add corn; sauté 8 minutes or until browned. Remove from pan; cool completely.
Combine juice and next 4 ingredients (lime juice through salt), stirring with a whisk. Combine corn mixture, tomatoes, and remaining ingredients. Drizzle juice mixture over corn mixture, and toss gently to coat.