2003 Altima ABS

[la1]

Hi I bought a 2003 Altima that after driving over 4mph ( normal) the ABS lamp illuminates ( not normal) . There is not a CEL , I think my Impala when it had wheel speed sensor issues it did not have a CEL either.
With the Impala for the year i had it was known it was the front passenger wiring pigtail for the sensor, after replacement no ABS issues. So for the Altima do i have to replace all or possibly connect to the sensor and spin the wheel i think my automotive DVM has a square wave function....any ideas