Wheel Speed Sensor Output
WARNING: This page is about a different car, the 1990 Cadillac Seville, 1990 Cadillac Eldorado, 1989 Cadillac Seville, and 1989 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
Low wheel speed sensor output is normally caused by improper gap or mounting. If wheel sensor output drops lower than 50 mV AC, ABS can no longer function properly.