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Thread: DPF soot

  1. #1
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    DPF soot

    Whatís the difference between soot measured and calculated
    I have been having my car doing regen it went away and stopped reving a little while ago then come back I drove at 40/50mph air con on 2500 rpm for 15/20 mins a couple of trips before when I scanned it was at 18.00g now itís down to 8.01g on the calculated and -2.26 on the measured
    What is the good soot levels is it as low as possible

    Cheers Matt

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    Benevolent Dictator Uwe's Avatar
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    I believe that Measured is based on the differential pressure sensor, while calculated is the ECU's best guess as to how much soot "should" have accumulated.

    Check differential pressure readings with key on, engine off, and again with the engine at idle.

    -Uwe-
    The engineering problems are likely insurmountable. It would be like proposing to land a rocket booster section on a barge floating in the middle of the ocean.

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    Ok cheers for that I did have that up but couldnít remember what I was I will give it a go see the difference
    Iím just glad the soot is down from before now the car shouldnít hand on the revs where is wants to do a regen

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    I have just looks at some pics of my results even when the soot was up at 18g the messured was still -2.26

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    Hi uwe

    Plugged in to my car this morning and the differential pressure readings was 2hPa with engine off and then idle it was at 8hPa reved to 2500 and was at 25hPa
    Iím not 100% what these readings are though is that what I should be expecting ?
    Cheers Matt

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    Also a thought I donít seem to be able to have measuring blocks on my engine module itís greyed out for some reason how I see my reading are on advance measuring values

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    Verified VCDS User PetrolDave's Avatar
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    Quote Originally Posted by Matt k View Post
    Also a thought I don’t seem to be able to have measuring blocks on my engine module it’s greyed out for some reason how I see my reading are on advance measuring values
    That's because your engine ECU uses UDS protocol.

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    Quote Originally Posted by PetrolDave View Post
    That's because your engine ECU uses UDS protocol.
    Cheers after I wrote that I seen another post that explained it

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    Quote Originally Posted by Uwe View Post
    I believe that Measured is based on the differential pressure sensor, while calculated is the ECU's best guess as to how much soot "should" have accumulated.

    Check differential pressure readings with key on, engine off, and again with the engine at idle.

    -Uwe-

    Do you now what the reading should be ball park figure ?

  12. #10
    Benevolent Dictator Uwe's Avatar
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    Quote Originally Posted by Matt k View Post
    Do you now what the reading should be ball park figure ?
    Should be 0 with the engine not running, and a very low number at idle.

    But we're missing context here. Have you posted an Auto-Scan from your car someplace on this forum so we can see exactly what engine and ECU you've got?

    -Uwe-
    The engineering problems are likely insurmountable. It would be like proposing to land a rocket booster section on a barge floating in the middle of the ocean.

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