2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 216Get this manual
FINAL DRIVE AWD Diagnosis
Symptom: AWD Will Not Engage 1Check the gearcase AWD coil resistanceMeasure between the Grey (C) and BrownWhite (B) wiresThe resistance value should be within specificationArmature Plate
Check for Wear Bands 5Check to make sure the AWD coil is seated in the U-shaped insert that is pressed into the gearcase coverThe top of the coil should be seated below the U-shaped insertIf the top of the coil is above the surface of the U-shaped insert it raises the armature plate, thereby increasing pole gapIf the pole gap increases, the coil will not be strong enough to engage the AWD systemIf this is found, replace the cover plate assemblyGearcase Cover Plate Asm
Front Gearcase Coil Resistance: AWD (Pin to Pin C): 24 ADC (Pin to Pin D: 12