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Peugeot 4007, 2013.
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Do you mean fuel pressure sensor, if so

(with ignition on)
Pin (3) 4.8 and 5.2v
Pin (2) 0 and 0.2v
(without) Pin (1) which runs ECU AG3 is less 1 Ohm (0.5 Ohms Nominal)
 

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Discussion Starter · #3 ·
first off thank you for your reply.

I mean the the regulator / cut off valve on the diesel high pressure pump. It has 12v from from pin 8 of the black plug in engine bay fuse box and 3.5v from ECU brown plug pin M4. I think this is supposed to be a negative but I can't understand why it has 2 different voltage
 

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There is no specific voltage you will see on most normal test meters.

It has a switched PWM voltage supply and the pressure is regulated by the pulse width/duty cycle of the regulator you need a scope to get accurate data.

Its rare for them to become intermittent other than o-rings wearing and jamming the valve they work or they dont

Its more likely to be air leak in the fuel system or not primed properly

Sent from my SM-T830 using Tapatalk
 
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