Thank you for the replies. I am beginning to think the same myself and I have a multi-meter but where to start? I don't know where the earth connections are, VIDA talks about using a special Volvo test adaptor connected to the ECM and the instructions refer to pin numbers in this adaptor. I also struggled to identify the component plug pin from the instructions. I'm sure others have done it so any advice would be welcome.
BTW I see the little black plastic vacuum switch mounted on top of the EGR valve is variously known as Boost Pressure Control Valve and a Governor. The Volvo part number is 8699233 and the Pierburg number is PA6-GF30. This controls the butterfly in the EGR cooler so is 'ECM-4510 Cooler Bypass Valve - signal too low' related to this switch and can it be tested? I found a new one on line for approx £110 which is extortionate for a simple switch so I'd like to check it first.
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