Heat closed contact grill 5 minutes. Meanwhile, brush both sides of salmon fillet with oil.
When grill is heated, place salmon, skin-side down, on bottom grill surface; close grill. Cook 5 minutes.
Meanwhile, in small bowl, mix mayonnaise and mustard. In another small bowl, stir together crushed croutons and pecans.
With back of spoon, spread mayonnaise mixture over salmon and sprinkle with crumb mixture; close grill. Cook 1 to 2 minutes longer or until salmon flakes easily with fork. Cut salmon into serving pieces to serve.