DDEC II vs DDEC III

Discussion in 'Trucks [ Eighteen Wheelers ]' started by See Are125, Nov 11, 2013.

  1. Pablo-UA

    Pablo-UA Road Train Member

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    really DDEC-II may be fixed... but... now we have many DDEC-III and IV on JYs for low cost and really it is easier to upfrade now
     
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  3. See Are125

    See Are125 Light Load Member

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    So am I understanding this right, the only difference between the DDECII and DDECIII and IV is the ECM? Maybe have to update a few sensors?
     
  4. Pablo-UA

    Pablo-UA Road Train Member

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    See Are125 Thanks this.
  5. See Are125

    See Are125 Light Load Member

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    Since Detroit no longer supports DDEC II, if it's been recently rebuilt it should be a DDEC III or IV, right? Also, the dealer isn't sure, how would I know the difference by looking at it? Any part or serial numbers to look for?
     
  6. Pablo-UA

    Pablo-UA Road Train Member

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    Ok, I gonna try to clear things.

    Old DDEC-II was based on parallel EPROM (one programmable, other UV erasable), so in/out ports were "hard", cant be changed.

    Later DDEC-III got FLASH and EPROM memory and it is more flexible, so truck makers got ability to do some vehicle specific things.

    DDEC-IV is improved DDEC-III. This unit got CAN (J1922) and it can communicate with other units, like autoshift transmissions, ABS/ASR units (torq limit for traction control).

    Later unused ports were used for EGR and Delta sensor. Aniway in early 2000-s DDEC-IV was old design (no J1939 support, lack of ports (PWM out for Vistronic fan clutch), low reliability (internal CMOS Li Battery leak, internal corrosion, cover problems), and DDEC-V was introduced.

    Other step was European Temic ECM for MBE engines. This ECM was the first controlled by CAN only from VCI unit in cab (also calld FMR/FR on MB trucks and ADM on non MB trucks).

    Later when detroit switched to MCM they use cab unit to control MCM and no so many wires of engine interface
     
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  7. motodad369

    motodad369 Bobtail Member

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    Hello. I want to install a ddec2 in place of a ddec3 in a1995 Pete. I would like to run the ddwc2 ecm as it is a sweet running low mile engine. Does anyone know what mods or changes I will need to make to the vehicle wiring harness? Any and all info appreciated.
     
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