HEAT barbecue to medium-high heat.
TOSS corn, peppers and zucchini with 1/4 cup dressing; place on barbecue grate. Grill 12 min. or until vegetables are crisp-tender, turning occasionally. Cool.
MEANWHILE, cook pasta as directed on package, omitting salt; drain. Rinse with cold water; drain well. Place in large serving bowl.
CUT kernels from corn ears. Add to pasta. Cut remaining grilled vegetables into 1/2-inch pieces. Add to pasta mixture with remaining dressing, onions, basil and cheese; mix lightly.
serving size = 1 cup (250 mL)