Chasing a "same but different" issue with an '04 ZD30 Y61. Did a number of tests including scantool check and the st would not communicate with vehicle, meaning loss of power to the ECU .. or zero ignition - no power.
This vehicle would lose accessories, use the indicators and they'd stop working - sometimes engine cut out - sometimes no dash lights with ignition key to on position, starter motor will crank normally but will not start and run. Some of the symptoms could've been co-incidental.
Found ant carcasses in the ignition, acc and blower relays. None were stuck within the contacts of the relays.
Did a bit of other playing around (how much for a replacement relay from Nissan? - solid gold contact prices)
Still fairly clueless as to the cause - the issue with my rig is (after the no ignition, no dash lights issue was sorted) that seconds after start up, it stalls. Intermittant. With all diesels in my care, i start them up and walk away for a minute or 2 to finish a task. This one can stall, whilst idling, after only a few seconds or even when i'm in it, not long after, reversed, and exiting the driveway it momentary cuts out but will keep running as i'm driving. Left to idle, engine shuts down like you turned the key off?