Dodge: abs speed sensor in diff. housing, metal debris, abs sensor

Question
is there any way to check the abs sensor in the diff. housing of a 1991 dakota pick-up? i replaced a rear brake line and shoes,wheel cyl. and drums now the abs lite in the dash will not go out no matter what you do

Answer
HEY ED,I AM ASSUMING THE LIGHT WAS NOT ON WHEN YOU STARTED? THE ABS READS OFF A EXCITER RING THAT ATTACHES TO YOUR DIFF CARRIER AND SOMETIMES IT PICKS UP METAL DEBRIS FROM THE FLUID.SINCE THIS IS A MAGNETIC SENSOR IT DRAWS METAL TO IT. I WOULD REMOVE IT,CLEAN IT,THEN STICK SOMETHING INTO THE DIFF HOLE YOU REMOVED IT FROM AND MAKE SURE THE EXCITER HAS NOT COME LOOSE AND CAN NOT READ PROPERLY.I WILL SEND YOU A POSSIBLE TEST PROCEDURE ON THE SENSOR AS SOON AS I FIND OUT WETHER IT IS A HALL EFFECTS,OR A AC GENERATOR STYLE. DOES THIS TRUCK HAVE FRONT ABS? CAN YOU GET IT SCANNED? ALSO CHECK THE WIRE HARNESS GOING TO THE SENSOR AS THEY HAVE CONNECTION ISSUES THERE.I WILL SEND A TEST ON THE SENSOR ON SUNDAY.HOPE SOME OF THIS HELPS,TIM.HEY ED,SORRY I DIDN'T GET TO YOU SUNDAY,I HURT MY BACK AND COULDN'T GET TO THE SHOP.THERE IS A HYDRAULIC VALVE THAT IS CONTROLLED BY AN ELECTRONIC MODULE ATTACHED TO THE DRIVERS SIDE FRAME RAIL IN THE REAR OF YOUR TRUCK.MAKE SURE THE CONNECTIONS ARE GOOD THERE? NOW FOR THE TEST,IF YOU HAVE A DVOM METER SET IT TO THE AC VOLTS POSITION.ATTACH YOUR LEADS TO THE SENSOR AND ROTATE THE WHEEL AT ONE REVOLUTION PER SECOND. THIS SENSOR IS A AC GENERATOR AND AC VOLTAGE SHOULD BE PRESENT(GREATER THAN 650MV)AS THE TOOTHED SENSOR RING PASSES BY THE STATIONARY SENSOR.IF NO VOLTAGE IS PRESENT AT ALL THEN YOUR SENSOR IS BAD.THIS SENSOR CREATES ITS OWN VOLTAGE SIGNAL AS LONG AS ITS GOOD AN THE EXCITER RING HAS NOT MOVED TO FAR AWAY FROM IT.(BAD CARRIER BEARINGS) HOPE THIS HELPS,TIM.SORRY AGAIN FOR THE DELAY.