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Simple DPF Query

  • 10-01-2011 1:18pm
    #1
    -Chris-
    Closed Accounts Posts: 12,035 ✭✭✭✭


    I'm hoping some of our resident experts can help me with this one...

    Here's an image of a DPF from some tech info I have (from a Fiat Chroma, if you're curious :p):

    142705.jpg

    The tube marked B is apparently a vacuum tube that connects to the rubber hose that's also visible next to the B.

    My queries:
    a) is it definitely a vacuum pipe?
    b) do all DPFs have this pipe or is this specific to this particular vehicle?

    Thanks! :D


Comments

  • #2
    Plug
    Registered Users, Registered Users 2 Posts: 9,248 ✭✭✭Plug


    I have no full understanding of how DPF work but I've seen them with metal pipes running down the length of them.


  • #3
    crosshair1
    Registered Users, Registered Users 2 Posts: 555 ✭✭✭crosshair1


    Not clear from the picture but as plug said there is usually a pressure tubes at each end of the dpf that leads to the differential press. sensor


  • #4
    Row
    Registered Users, Registered Users 2 Posts: 2,025 ✭✭✭Row


    Ye it looks like oneof the differential pressure pipes..basically these tubes are connected to a differential pressure sensor,the sensor measures when the filter is starting to block....one tube (hose) is connected to the engine side of the dpf filter and the other is connected to downstream side(after the filter)
    when the filter starts to block...say pipe A will builds up pressure (before filter) and there is a difference between up stream pressure and down stream pressure..across the filter.
    This pressure is measured by the differential sensor which has a diaphragm inside.this converts the movement of the diaphragm in voltage which is measure by the ecu.


  • #5
    shamwari
    Closed Accounts Posts: 2,142 ✭✭✭shamwari


    For pig iron, I'll check Fiat's ECU scan, but I'm almost certain that the pressure differential reported by the sensor can be read as live data.

    -Chris- is the Chroma your car? If so, how do you find it? I think they are a lovely machine myself!


  • #6
    -Chris-
    Closed Accounts Posts: 12,035 ✭✭✭✭-Chris-


    Nope, not mine. I don't think I've ever even driven or sat in one. They're a rare enough beast on our roads.

    Are they nice to drive?


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  • #7
    shamwari
    Closed Accounts Posts: 2,142 ✭✭✭shamwari


    -Chris- wrote: »
    Nope, not mine. I don't think I've ever even driven or sat in one. They're a rare enough beast on our roads.

    Are they nice to drive?

    I had a short run in one last year. It seemed a bit softly sprung but very very comfortable. The engine had plenty of go in it. Interior was lovely, nice 'n' plush!


  • #8
    shamwari
    Closed Accounts Posts: 2,142 ✭✭✭shamwari


    Found this: http://www.fiatforum.com/croma/240514-problem-differential-pressure-sensor.html


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