Engine ECM codes

Discussion in 'Trucks [ Eighteen Wheelers ]' started by tumbafox, Sep 30, 2012.

  1. Sep 30, 2012 #1
    tumbafox

    tumbafox Bobtail Member

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    Sep 27, 2012
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    Does anyone know how understand the difference between ACTIVE, INACTIVE and OCCURRENCES. I imagine many codes are the same regardless of truck. This happens to be related to an E7 Mack 6 cylinder Diesel. Stay Safe and Thanks if you can help and thanks anyway if you can't.

    If you know of any websites that explain that would help too
     
    tumbafox, Sep 30, 2012
    tumbafox, Sep 30, 2012
    #1
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  3. Sep 30, 2012 #2
    Cat sdp

    Cat sdp . .

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    Active is something the ECM sees wrong now. And if problem is cleared up for what ever reason it becomes inactive until it's cleared by someone with a lap top. In your case low coolant active put coolant in it becomes inactive . Don't know about the last one.
     
    Cat sdp, Sep 30, 2012
    Cat sdp, Sep 30, 2012
    #2
  4. Sep 30, 2012 #3
    Heavyd

    Heavyd Road Train Member

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    Every manufacturer has slightly different names for everything, but Cat sdp pretty much nailed it with active versus inactive. Occurrences are situations that the engine encounters and can log information. Occurrences may or may not be indicating a problem. Examples are vehicle overspeed, where the ECM is seeing vehicle speed go higher than it's programmed max, (like when coasting down a hill). ECMs can also detect extreme braking events, brake switch input in addition to very rapid drop in vehicle speed. If the engine shuts downs due to idle shut down it may record that. They will also record occurrences where the engine was operated with low oil pressure, or high coolant temp, or even engine speed too high.
     
    Heavyd, Sep 30, 2012
    Heavyd, Sep 30, 2012
    #3
  5. Oct 6, 2012 #4
    tumbafox

    tumbafox Bobtail Member

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    Thank you. This is helpful
     
    tumbafox, Oct 6, 2012
    tumbafox, Oct 6, 2012
    #4
  7. Oct 6, 2012 #5
    tumbafox

    tumbafox Bobtail Member

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    thanks you guys are all great. on topic
     
    tumbafox, Oct 6, 2012
    tumbafox, Oct 6, 2012
    #5
  8. Oct 6, 2012 #6
    tumbafox

    tumbafox Bobtail Member

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    Thanks to everyone. Its all helpful. Would you believe that Mack Corporate relations told one of my people that shops are independent and if you go to a Mack Dealer for an overhaul, other shops do not have to honor that warranty!
     
    tumbafox, Oct 6, 2012
    tumbafox, Oct 6, 2012
    #6
  9. Oct 7, 2012 #7
    heavyhaulerss

    heavyhaulerss Road Train Member

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    that should tell folks to consider where they should buy their next truck
     
    heavyhaulerss, Oct 7, 2012
    heavyhaulerss, Oct 7, 2012
    #7
  10. Oct 12, 2012 #8
    tumbafox

    tumbafox Bobtail Member

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    Why does Mack fail to disclose the meaning of engine codes. It should be easy to find this info on the Internet. Dealers give us nothing but double talk. example, if there were 6 occurrences of "slow down" alarm, but none for excess RPM the engine might have been well with safe RPM limits. The Driver may have set the max vehicle speed so the truck would alert if the vehicle exceeded that speed. He could have been going down a hill with with the engine off and the transmission in neutral (theoretically). Vehicle speed is not directly related to RpM. There are separate Rpm sensors I would assume.

    Tumbafox.
     
    tumbafox, Oct 12, 2012
    tumbafox, Oct 12, 2012
    #8
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