MAP sensor you cannot really 'test' on software, you can only really verify the output of it.
You can set the software -
MultiECUScan being recommended - to display the out put graphs for a number of parameters, manifold pressure being one of them.
Obviously at idle you should probably be vaccing (i.e. negative manifold pressure) but when you apply the throttle you should build some boost. You'll only build a very very small amount if revving when stationary. Under load whilst accelerating you should hit max boost which I think is in the region of 1.5-2bar pressure. 3 bar being around 30psi. Diesels do build good boost but don't quote me on exact figures, it's been a while since I've tinkered with one!
Of course if you have a wiring fault the above may not actually be of any benefit to you, as you'll not know if it's a wiring issue or a sensor issue that's showing you any abnormality you see.
Did you note the part number on your MAP sensor whilst you were there? Ultimately I think the only way you'll know for sure whether its the sensor or wiring is to try another sensor.
Vac leaks cannot be tested, no. It does tend to be fairly obvious when the turbo actuator system drops it's vacuum, as you'll get stuck in high boost mode. So you will end up with a heap of turbo lag then all of a sudden kick off like a rocket mid rev range. It tends to be quite pronounced.
Again
MultiECUScan does have an actuator test for this. It has to be performed with the engine off, so it's running on stored vacuum - as with engine off you can't produce any. So you can only really run the test effectively once, maybe twice. If you run it, you're looking for the turbo actuator arm to be moving about 10mm and will cycle four or five times in the test.
