A couple of things:
1. You will need to pull the code. This is in essence to minimize the possibility of the ABS pump having a fault.
If there is no code, that doesn't completely rule out the ABS pump. Unfortunately, that's what I think we are leading up to at this point.
2. It may be another sensor. If one went south, then there is the liklihood/pissibility that others also failed.
When you say that you don't have ABS, does this mean that the wheels lock under braking or the wheels don't lock up and you still don't stop? That is to say that you don't get the shuddering or pulsation that is a physical indication that the ABS doesn't work?