"Signal" wire is at 0 Volts with no vac appled.
As hard as I can suck gets it up to 1.8V
Earth is at 0 Volts, Supply is at just under 5V
Everyhting seems to be working (except that it isnt)
It is not clear what it is that the ECU is picking up on to decide that the sensor is faulty? 
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Ford Transit (Pick up) 2.5 Di 2004 (54) - EGR fault, code P0409 # - Paul Howd January 22, 2010, 12:15 pm
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