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CAT 3126 help

Discussion in 'Trucks [ Eighteen Wheelers ]' started by durham, Oct 9, 2010.

  1. Oct 9, 2010 #1
    durham

    durham Bobtail Member

    3
    0
    Oct 9, 2010
    Central MO
    0
    I've got a 2000 Freightliner with a 3126 CAT engine. I basically drove it home and it will not start now. ran the codes they are 74, 73, 72, 15, 39. Is there a place where I can find some diagnostic help? Thanks in advance. Oh also the oil has been changed 3 days before I brought it home with 15W40 Chevron Delo 400.
     
    durham, Oct 9, 2010
    durham, Oct 9, 2010
    #1
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  3. Oct 10, 2010 #2
    durham

    durham Bobtail Member

    3
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    Oct 9, 2010
    Central MO
    0
    know what these codes represent 74,73,72 are injector codes I believe
     
    durham, Oct 10, 2010
    durham, Oct 10, 2010
    #2
  4. Oct 10, 2010 #3
    Bent Wrench

    Bent Wrench Medium Load Member

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    Aug 11, 2009
    Cornholio, OR
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    Last edited by a moderator: Oct 10, 2010
    Bent Wrench, Oct 10, 2010
    Bent Wrench, Oct 10, 2010
    #3
  5. Oct 10, 2010 #4
    josh.c

    josh.c Road Train Member

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    Feb 22, 2009
    Knoxville, Tn
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    That's what I saw for the trouble codes list I have, but it doesn't have the 3126 on the list of engines it's for. It doesn't show a code 39 at all, as an example. Sorry I'm no help, maybe someone that knows what they're talking about will come along sooner or later.
     
    josh.c, Oct 10, 2010
    josh.c, Oct 10, 2010
    #4
  7. Oct 11, 2010 #5
    Jas

    Jas Medium Load Member

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    Dec 13, 2008
    Eastern Sea board, Australia
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    Code 39 - Injector actuation pressure system fault
    Code 15- Injector actuation pressure sensor erratic/short/open
    Codes 72,73,74 injector current codes for all injector pairs.
    Hard to say what is causing this, if all those codes are active you may have a fauty ECM, have you been welding on the truck? If those codes are logged you may have a faulty IAP control valve.
     
    Jas, Oct 11, 2010
    Jas, Oct 11, 2010
    #5
  8. Oct 11, 2010 #6
    Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    Hello! This is common problem for all 3126. There are many 3126 in Russia on LIAZ buses and all they gon into the trouble at least once after oil change. There are oil actuated injectors in this engine and this engine ise very sensetive to oil quality and sometimes require oil system preoiling.

    So look for oiling system problems.....

    well, they got many buses with 3126 Euro-III, but the problem was so major that they did engine swap with 3106 (Euro-II).
     
    Pablo-UA, Oct 11, 2010
    Pablo-UA, Oct 11, 2010
    #6
  9. Oct 16, 2010 #7
    durham

    durham Bobtail Member

    3
    0
    Oct 9, 2010
    Central MO
    0
    It was the ECM, I hadn't done any welding but the alternator did go out 2-3 weeks ago. Not sure if that caused it. But that's what it needed thanks for all the help. I appreciate it.
     
    durham, Oct 16, 2010
    durham, Oct 16, 2010
    #7
  10. Oct 17, 2010 #8
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
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    Oct 11, 2010
    Borispol, Ukraine
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    Cat ECM is VERY difficult to disassembly!

    It is very reliable but may be damaged with overvoltage
     
    Pablo-UA, Oct 17, 2010
    Pablo-UA, Oct 17, 2010
    #8
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