Technical Water in fuel sensor pinout - EURO4, EURO6

[acer45]

I have a 2007 ducato with a 2.3 euro 4 engine. This is the second time I am fighting a fuel filter leak (the famous green filters). I am trying to adapt the filter from a newer version of the ducato (euro 6) where there is this aluminum housing.

I have already checked the fuel temperature sensor (2 pins in the plug) and it has the same characteristics ( NTC 2k). The order of pins for the thermistor does not matter, so the connection is simple.

I have a problem recognizing the connections of the fuel water sensor (3 pins)

Does anyone have a description of which pins of these sensors for the filter from euro 4 and from euro 6? I measured a little resistance between these pins and they are similar in both cases, but not the same. So there is a chance that this sensor from euro 6 will work in euro 4, but I am not sure of pinout.

This is the filter from euro4 - temperature measurement on the right (2 pins), water sensor on the left (3 pins)

This is a filter from euro 6 - one plug has pins from heating ((two thick pins on the left, This I will skip when plugging in), temperature measurement (2 pins), water sensor (3 pins)

 

[deejays]

For the Euro 6 aluminium, the three pins are numbered 8, 9, and 10. Pin 8 is supplied with +12V supply via the ignition switch. Pin 10 is connected to earth. Between pin 8 and 10 are the top and bottom connectors of a potentiometer, the wiper of this potentiometer is connected to pin 9. Pin 9 is the variable signal output (dependant on water level) that connects to the ECU. So, with an ohm meter connected across pins 8 and 10 you should measure a fixed resistance. From 8 or 10 to 9 you would read a variable resistance dependant on water level. I assume the Euro 4 plastic would be similar. Not sure if the pins are numbered, but perhaps the centre pin would logically be the wiper of the potentiometer.

 

[Kahcorp]

I have the later model vehicle here. Would you like me to back probe to work out what the pins are.
Is that what you are after?
I now see deejays info should be enough for you.

 

[acer45]

Thanks for the answer, I'm not sure if it works like a potentiometer... As I measured the resistances on the following pins in both these filters, I have the impression that there are semiconductor elements inside. I conclude that sometimes I had to reverse the polarity of the multimeter probes to get a result. Maybe there is some information about the pins in the closed Fiat electrical documentation?

I tried to do a test with pouring water into the filter but maybe my sensor in the filter (Euro4) is defective because I didn't notice a difference in resistance readings.

 

[the green vanper]

Attached the eLearn docs for the EUR4 and EUR6 models.

 

[Communicator]

I have not visited this thread previously as my 2.8jtd is euro3. However later versions of the x244 used the so called "green filter", but in an all black version. The attached diagram relating to my 2.8jtd shows the filter near the lower LHS corner. The 3 way connector details can be viewed here but they are incorrectly labelled as being for the heater.