I thought I'd post an update to my still unresolved problem. I've measured the voltage at the VNT governor plug and it's consistently 8.4V. Vida says the voltage should be between 0V and battery voltage..... which 8.4V is! I've decided to replace the VNT governor with a new Pierburg unit £60 online as opposed to £195 for the Volvo part. However..... I still have the same symptoms. Does anyone have a reference voltage for the VNT governor supply? Is 8.4V normal? I've also suspected a faulty relay but looking through the manuals and VIDA I can't find a reference to a relay for the turbo governor. Any ideas??
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