Problem:
EDC17CP51 – Nissan Titan XD.
When attempting a connect, Xhorse Multi-PROG seems to reboot, and connection fails. (With or without P3 connected to PCB as illustrated. If pin 65 (12volt) is removed, no reset occurs, but the connection is still unsuccessful.
Solution:
Need a power supply for your multiprog.
Use 12V power supply.
UPDATE: external bench power supply resolved this issue.