SPRINKLE gelatine over cold water in small saucepan; let stand 1 minute. Cook on low heat 5 minutes or until gelatine is completely dissolved, stirring constantly. Add sugar and coffee granules; stir until dissolved. Remove from heat; stir in whiskey and vanilla.
PLACE ice cream in blender or food processor container; cover. Blend until smooth. With blender running, gradually add gelatine mixture through the feed cap, blending well. Pour into large bowl; let stand 2 to 3 minutes or until mixture mounds slightly when dropped from spoon. Gently stir in the whipped topping.
SPOON into crust. Refrigerate several hours or until firm. Store leftover pie in refrigerator.