Combine flour and pepper in a shallow dish. Dip scallops in flour mixture; dip in egg white, and dip in flour mixture again.
Coat a nonstick skillet with cooking spray; add 2 teaspoons margarine. Place over medium-high heat until margarine melts. Add half of scallops; cook 6 minutes or until scallops are lightly browned, turning to brown all sides. Remove scallops from pan; set aside, and keep warm. Repeat with remaining margarine and scallops. Add wine and remaining 3 ingredients to pan; cook 3 minutes or until mixture reduces to 1/3 cup.
To serve, arrange scallops on a serving platter; top with sauce.