When the car is cold and you first start it, dose the pump start? If you squeeze the hose from the pump to the check valve can you fell pressure? The test only runs for about 10 seconds so you need the good up and know where you are looking?
Of course if you know someone with the right odbii reader they can command the system on, you can make sure the pump and valve it's working.
Have you tried and cleared the code?

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