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"Drive cycle" to clear permanent DTCs? Cascadia

Discussion in 'Freightliner Forum' started by whatd, Oct 25, 2019.

  1. Oct 25, 2019 #1
    whatd

    whatd Bobtail Member

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    Apr 18, 2015
    0
    I had an emissions-related repair last week. Nox was outside range. They fixed it and I saw the data myself. They forced a regen to clear the codes.

    The "permanent DTC" code came back. From what I've read, there's a specific sequence of events, including a "drive cycle" , possibly called a UTDP or " Universal Trip Drive Pattern" that must be performed in order to clear permanent DTCs. This may be truck specific and seems to be a big secret, although mechanics must all do it to clear emissions-related codes.

    I can clear codes and force a regen but how do I discover the drive-pattern sequence for my 2013 Cascadia?

    Thanks
     
    whatd, Oct 25, 2019
    whatd, Oct 25, 2019
    #1
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  3. Oct 25, 2019 #2
    mhyn

    mhyn Road Train Member

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    Dec 29, 2008
    Northridge, CA
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    do back to back two regens to clear emission codes. Some emission codes can be cleared without regen and some codes can be cleared by one time regen. Just follow instruction for specific code(how to fix it and clear it).
     
    mhyn, Oct 25, 2019
    mhyn, Oct 25, 2019
    #2
  4. Oct 25, 2019 #3
    Working2party

    Working2party Medium Load Member

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    Feb 10, 2018
    Kansas
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    When it only says “Permanent” that’s just saying it’s been stored in the MCM basicly a “time stamp”, so that if the repair didn’t hold, it can through the Government code faster..... it’s not like the “self healing”. Where if the check engine light and MIL light are on. If the conditions setting the Check code are removed and the Check light goes off, the MIL will stay on for the next three trips.

    If that’s what your looking for. Detroit considers a trip : Engine Start, vehicle Drive Over 30mph and more than a mile. Vehicle stop engine shut down.
     
    Working2party, Oct 25, 2019
    Working2party, Oct 25, 2019
    #3
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