Citroen Berlingo 2.0 HDI 2006 self -diagnosis

Hello ..
I have not managed to connect to the computer for diagnosis my citroen Berlingo 2.0 hdi, because I am surely not using the correct program for this car.
You would help me a lot if you could advise me that program would be better to use to carry out this work. And, I would also like to know what are the normal values ​​of air flow, injection tension, progress injection, etc. to see if my car after diagnosing it, I would be in normal limits.
In truth, what I am trying to find out, is because I spend around 8 the 100km, and sometimes more. I have never managed to get a minor consumption.
Thank you.

Hello, that Berlingo came with Ecu Bosch and Siemens, if you tell me which one it has I can pass you how to check the components.
Greetings