ISTA Fault Diagnosis Procedure / Clear faults - Chicken and Egg

[Colink2]

In your photo the DDE Ecu is in red! This means it is not responding correctly!

Thanks for your input.

I might be wrong, If it is not responding the background of the box will be red. I believe it is only red border because I selected it. 
I have got to this point in the test many times and never proceeded if the box background was red.

Still no further on, except I have fitted a new Charge Pressure Sensors, even if that fixes the issue it would be good to know how to actually use the test procedure to identify faulty components.