Refrigerator condebser fan motor ohm meter check

Hi,

The condenser fan motor is WR84X10055. I checked resistance between the lead. 1.8k (red & white), 20k (red & blue), 20k (white & blue), infinit (white & yellow). The blue lead actually didn’t connect to motherboard. What is the blue lead for? Yellow wire is connect to the pink to the main board. Is there capacitor in the motor through the yellow lead? Does infinit between white & yellow mean dead motor? Thanks,

Xiaoyu,