The Nissan Path

I have a 2000 Pathfinder. When I use my scan tool to review the module info it gives me ECU Part Number:##
ECUID:FFFF
Prog No.:##
I can't get into any systems: tcm, abs, SRS
Replaced the ECU and same issue

Engine runs

Check pin# 1 on the DLC for ignition power, and if there isn't any, check fuse #24 in the cabin fusebox. The ECM must have power since the engine runs, but if the DLC doesn't have ignition power then your scanner won't be able to talk to it. See EC-587 here:
https://www.nicoclub.com/service-manual ... 0%2Fec.pdf