Place corn on grill rack coated with cooking spray, and grill 12 minutes or until corn is lightly browned, turning frequently. Cool, and cut kernels from ears of corn.
Combine vinegar and next 8 ingredients (through black pepper) in a large bowl, stirring until sugar dissolves. Add corn kernels, bell pepper, and onion; toss well. Store in an airtight container in the refrigerator.