Pretty sure it can't be imported as the pathfinder was released locally.
Whick model is it? ST, DX, Ti ?
4cyl or 6cyl?
If it's the 4 it'll be bullet proof (either SR20 or FJ20 iirc) - EDIT - The 4cyl is apparently the 2.4lt four-cylinder motor called the Z24. Very fuel efficient but also very underpowered from what I have read (relative to being a 4x4 so no towing your speedboad or caravan etc.)
If it's the 6 pay particular check the cooling system.
Check the trans/gearbox, flywheel, clutch which are the most common faults with Nissans
*** If there is a problem with the above WALK AWAY, I'm pretty sure they have to remove the engine to replace the gearbox/trans with this model. I know for a fact that the 300z and Bluebird SSS was designed in the same fashion, where to replace the trans/gearbox the engine has to be removed - design fail... ***
And like the dude b4 me said, check seals etc to check for signs of rust.
But in all fairness I'm guessings it's in the $3-4K price range?
You'd probably be able to get a rough "work horse" type one that some labourer has used for ~2K, if it's closer to 4K you should expect it to be pretty schmick IMO
AND...
If you can, fuck the RAA off and use Motacheck -
www.motacheck.netMUCH more thorough and reliable from what I have heard
This may help you as well:
http://www.redbook.com.au/used-cars/results.aspx?TabId=1407342&No=15&Qpb=true&SearchAction=N&N=2994%202952%204294965850%204294947575%204294842971&sid=123533FC7365&Nne=15&Ns=p_Make_String|0||p_ClassificationType_String|0||p_Family_String|0||p_Year_String|1||p_SequenceNum_Int32|0