Check the wastegate with reduced pressure

Fig 1: Identifying Pressure Adjusted Downwards

Courtesy of VOLVO CARS OF NORTH AMERICA.

During this procedure it is important that the pressure is only adjusted downwards before reading off. 

If you have accidentally set too low  a pressure, increase the pressure to the value for max pressure and then reduce to the correct control pressure according to the table. Otherwise the reading will be incorrect

1. Set the control pressure for the actual engine version according to the table.
2. Read off the stroke and note check value 2.
3. Release the pressure.