Any one out there knowledgeable in pre 96 ABS systems? I am still working on trouble shooting my 93 ABS system. I am having the self check engage almost every time the car passes through 15-20 MPH wheter I am accelerating or braking. I have tried a diferant ABS CU, and a Differant ABS relay. No ABS light on dash, and no ABS codes stored. Rebuilt calipers, cleaned ABD pickups at wheels front and rear.

Looking for wiring diagram to find out where the Self check is activated from and what tells it to function only once after the car is running??