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James Austin

e39 530d no rail pressure?

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Good day

I'm getting an error on inpa saying fuel rail pressure 0 bar, and then when i go into analog values it shows that my rail pressure is indeed 0. I've tested the sensor using an oscilloscope while the engine is running and i am getting a wave and its changing how it should  but yet inpa still picks the value up as constant 0 ,iv tried cleaning the contacts but yet no luck.

 

This is causing major power loss as whenever you rev the car above 1500 the turbo vnt opens and then there is no boost  (im sure this is happening because the engine doesn't want to run lean due to it thinking there is inadequate fuel pressure in the common rail).

 

Any advice on what the issue could be?  could it be that the fuel sensor is showing a wave( to me on the oscilloscopecope)  but maybe not the right one that the dde can interpret 

cheers

James

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