Help With Detroit ECU

Discussion in 'Trucks [ Eighteen Wheelers ]' started by GioPanama, Oct 14, 2011.

  1. Oct 14, 2011 #1
    GioPanama

    GioPanama Bobtail Member

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    Oct 3, 2011
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    I Have a freightliner classic 1995 with detroit 12.7, it had a DDC III ecu, the ecu died so I buy an used one, but it dosnt have a plaque or piece of paper that say if its a ddc III or IV. When i start the truck it runs fine,but on the first trip, it make and engine failure, but just for like 2 second and also pulls smoke, then it get normal and runs fine, but does it all the time.
    I conect my laptop and it say oil temp sensor and the turbo sensor, I delete it the turbo one, but the oil no because I have to change the sensor. I put a new turbo sensor and the problem continues and keep saying is the sensor.
    Now the questions: How can I now if the ecu is a DDIII or IV? I get the ECU serial number with the laptop that is VF601434, but i dont know where to look if it is III or IV.

    2- Does the turbo signal or sensor can cause that engine failure?

    Thanks!
     
    GioPanama, Oct 14, 2011
    GioPanama, Oct 14, 2011
    #1
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  3. Oct 14, 2011 #2
    Pablo-UA

    Pablo-UA Road Train Member

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    man, you have DDDL on your laptop. when you hook it up ECM ID window pops up!
     
    Pablo-UA, Oct 14, 2011
    Pablo-UA, Oct 14, 2011
    #2
  4. Oct 15, 2011 #3
    Sparkz

    Sparkz Light Load Member

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    Jul 10, 2011
    New Zealand
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    Not sure, but I think VF ECM's are DDECIV.

    Are you using DDDL or some other diagnostic program?

    What software level does you program report the ECM as? DDECIII will be R9 or similar. DDECIV will be R20 or greater.
    Did you just fit the ECM, or did you get it reprogrammed to your engine number?
    Did you set the injector codes?
    Exactly what fault codes are you getting? Flash code, PID, SID, FMI etc.

    If you send me your engine serial number and the engine number that the new ECM is programmed to, I can check to see if they are compatible.
     
    Sparkz, Oct 15, 2011
    Sparkz, Oct 15, 2011
    #3
  5. Oct 15, 2011 #4
    snapon2

    snapon2 Bobtail Member

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    Jan 13, 2011
    grande prairie alberta
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    ddec 3 and 4 will run your engine but the boost sensors are different.so you will have a boost sensor code if you put a ddec 4 ecm on a ddec 3 . with a boost code you may not get any fuel as it stays in smoke control till it sees 5 psi boost.if you have dddl on your laptop look at engine configuration data in diagnostics drop down to see what your ecm is programmed to
     
    snapon2, Oct 15, 2011
    snapon2, Oct 15, 2011
    #4
  7. Oct 15, 2011 #5
    snapon2

    snapon2 Bobtail Member

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    Jan 13, 2011
    grande prairie alberta
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    also oil temp,code will cause shut down .try unplugging it as it will change the code to a sensor fault and not shut it down, or change the shut down calibration to warning with your laptop
     
    snapon2, Oct 15, 2011
    snapon2, Oct 15, 2011
    #5
  8. Oct 15, 2011 #6
    pichu

    pichu Light Load Member

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    Jan 18, 2009
    mexifornia
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    dd3 and dd4 had different timing , you need chance the bull gear and camshaft to run dd4 ECM:biggrin_2554:
     
    pichu, Oct 15, 2011
    pichu, Oct 15, 2011
    #6
  9. Oct 16, 2011 #7
    Pablo-UA

    Pablo-UA Road Train Member

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    compare engine numbers in ECU and on engine.
     
    Pablo-UA, Oct 16, 2011
    Pablo-UA, Oct 16, 2011
    #7
  10. Jul 29, 2017 #9
    SAMMY D

    SAMMY D Bobtail Member

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    Jul 29, 2017
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    I SWICH ENGINES ON MY 379 PETERBILT ,DETROIT 12.7 TO SAME ENGINE,THAT GOT FROM A FREIGHTLINER ,MINE BLEW,NOW THE ENGINE WILL NOT START,DDEC 3 ONLY RUNS 3 INJECTORS ,DDEC 4 WILL NOT COMMUNICATE WITH SYSTEM AT ALL,FIXING TO BUY ANOTHER ECM BUT DONT KNOW IF ITS GOING TO BE A MONEY PIT TRIYIN TO FIND THE PROBLEM
     
    SAMMY D, Jul 29, 2017
    SAMMY D, Jul 29, 2017
    #9
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