Help with Diagnostics: ZD30 GU Nissan Patrol (2004 STL Auto)

Hello...(i started on ThreadID: 90728)
I need help like most other GU 3.0 ltr owners who have had a motor go Bang,
ours went for the second tim in Dec last year. Great Chrissie present...
.Well I rebuilt the ZD30, amazing there was no wear or damage apart from 4 piston crowns, After considerable measuring a clean-up bore hone and Standard sizes re-used throughout, Changing oil & Lube Oil Filter every 5000km kept it clean.
I did not service the Injection Pump or the injectors as only 110,000km use & I intend the upgrade the vehicle. (Repair cost under $2K so far),
Re-assembled strictly in accordance with manual. Easy to rotate by hand and socket on front pulley with glow plugs out, All timing marks spot on, started easy

Having said that.... the mongrel won't rev more than 1500 rpm & exhaust won't go above 160deg c @ turbo inlet.. Starving of fuel, plenty of air...
It is diagnostics time..
The only error code that comes up when checked is 0505 which is.."No Faults Detected" I read up on the Air mass flow sensor and carried out the voltage checks as specified, all indications it is OK??
I can't drive it more than 10k hr so I am stuck, will need it towed to.....

any ideas out there on what I may of missed or overlooked, disposable income does not exist these days. If it was a horse I would have it put down.
cheers Don