Testing PD Injectors?

Does anyone know how to test fuel injectors on a PD engine? They use Unit Injectors so you cannot do a leak back test.

I have recently had them tested at a local garage and they tested the fuel return via the OBD using a laptop so does anyone know which program will show this sort of information? Would VAGCOM show this? Or can anyone recommend anywhere that will test these for me in the North East area?

Thanks in advance

 

vcds will show whether the injectors are in specicified tolerance in measured value blocks .

 

Thanks for the reply!

Do you recommend what version of VCDS and what cable I could use for my car? Audi A3 1.9tdi 2008

 

Latest version of VCDS and genuine Ross-Tech cable.