abs light on please help!!

Guys and Gals, My abs light came on today for no apparent reason i drovethe car last night and it was fine, and today i put a new h20 pump in and when i went to drive it the abs light was on, all the fuses are good what could it be it seems so weird that it came on after doing the water pump any help would be greatly appreciated Thanks a bunch Dan
Car is 96 Gt vert 5 speed 61K miles