im not sure on a ford if you have 3 wheel speed sensor of 4, you can unhook the sensor connector and check ohms from left side to right side they should be the same, if you only have 1 in the rear that make this harder, the rear sensor often has different resistance value than the front. also on an a/c volt scale you can spin the wheel and you should make voltage but be careful not to spread the terminals when you check this thats one of the worst mistakes even professional techs make, turns 1 problem into many.