Thanks Mark! (and Kevin for pointing out my error 
Realised that it was a Maf Sensor fault because after testing wiring Maf Sensor, had 12v supply, 5v reference supply, good earth but no output voltage.
Never tested a Maf where there has been no output voltage whatsoever. Another lesson learned.
Cheers all!
Message Thread 
VW Passat 1.9 TDi 2002 - Loss of Turbo power, codes P1556 & P1144 - Fixed # - Ian Waring February 5, 2015, 11:14 pm
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