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TSB udate

Discussion in '3rd Gen. Tacomas (2016+)' started by Beshaw1221, Mar 6, 2021.

  1. Mar 6, 2021 at 2:24 AM
    #1
    Beshaw1221

    Beshaw1221 [OP] Well-Known Member

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    So I am going to attempt the 04B31 to 04B33 flash today. I think I. Have everything. Needed to proceed except a battery support unit. I’m sure there are many out there who have done this on their own so what exactly should I get without spending a grand. Ive heard once you start flashing it can really drop your volts.
     
  2. Mar 6, 2021 at 2:25 AM
    #2
    Beshaw1221

    Beshaw1221 [OP] Well-Known Member

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    Is it even worth trying my toyo dealer first to see if they will do it?
     
  3. Mar 6, 2021 at 4:26 AM
    #3
    Dank Donkeh Luvver

    Dank Donkeh Luvver Well-Known Member

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    If you have the Tactrix cable and Techstream it should take 5-10 minutes. Turn off ALL aux power (headlight, dome lights, radio, etc). Double click your .cuw file and follow the instructions. Super easy.

    If you're nervous, ask your dealer to do it.
     
    tonered likes this.
  4. Mar 6, 2021 at 4:39 AM
    #4
    Beshaw1221

    Beshaw1221 [OP] Well-Known Member

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    I have the new open port 2 cable I got with my VF tune kit from OV.
     
  5. Mar 6, 2021 at 4:40 AM
    #5
    Beshaw1221

    Beshaw1221 [OP] Well-Known Member

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    I assume that’s the new tactic cable
     
  6. Mar 6, 2021 at 4:41 AM
    #6
    Beshaw1221

    Beshaw1221 [OP] Well-Known Member

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    I am nervous but also don’t want to mess around with the dealer. From everything I’ve read it’s hit or miss on whether they will do the update
     
  7. Mar 6, 2021 at 4:44 AM
    #7
    Dank Donkeh Luvver

    Dank Donkeh Luvver Well-Known Member

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    Yes thats the right cable.
     
    tonered likes this.
  8. Mar 6, 2021 at 5:08 AM
    #8
    Beshaw1221

    Beshaw1221 [OP] Well-Known Member

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    So you did yours without a battery saver?
     
  9. Mar 6, 2021 at 5:22 AM
    #9
    gForceDude

    gForceDude High Miles & Big Smiles

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    ECU Update 04B81 265/75/R16C Shoes Happy & Content
    https://www.amazon.com/NOCO-GENIUS10-Fully-Automatic-Temperature-Compensation/dp/B07W3QT226

    This one has a "12 Volt Supply" Mode specifically for holding a battery at the proper 13.8 vdc during a flash.
    Made in America, built like a tank, works beautifully.
     
    VB25, tonered and RustyGreen like this.
  10. Mar 6, 2021 at 5:24 AM
    #10
    Beshaw1221

    Beshaw1221 [OP] Well-Known Member

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    You used it for flashing?
     
  11. Mar 6, 2021 at 5:30 AM
    #11
    gForceDude

    gForceDude High Miles & Big Smiles

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    Yes, that is specifically what I got it for.
     
  12. Mar 6, 2021 at 5:40 AM
    #12
    Beshaw1221

    Beshaw1221 [OP] Well-Known Member

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    Cool. Thanks for the info
     
    gForceDude likes this.
  13. Mar 6, 2021 at 5:53 AM
    #13
    pinochle

    pinochle GC8 Fanatic

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    Don't worry about your battery. You should be fine. Just make sure your hood is open.

    AND... turn off ALL accessories. Lights, radio, HVAC, BSD, Park Assist, Heated Seats, etc.

    And make sure your hood is open.
     
    Skydvrr and tonered like this.
  14. Mar 6, 2021 at 6:45 AM
    #14
    Beshaw1221

    Beshaw1221 [OP] Well-Known Member

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    Sounds good. Thank you
     
  15. Mar 6, 2021 at 6:45 AM
    #15
    Dank Donkeh Luvver

    Dank Donkeh Luvver Well-Known Member

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    Ive done TSBs on 6 or 7 trucks without using a battery maintainer and never had an issue. Im pretty sure thats the case for most guys on here as well.

    I always check the battery with my multimeter first and make sure its 12V+ before doing anything else.

    If youre really worried you can use a maintainer or hook your truck up to a running car via jumpers.
     
    tonered likes this.
  16. Mar 6, 2021 at 6:47 AM
    #16
    Beshaw1221

    Beshaw1221 [OP] Well-Known Member

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    Sounds good. Just learning the ropes
     
  17. Mar 6, 2021 at 6:49 AM
    #17
    ktbell444

    ktbell444 As lost as a lieutenant during land nav

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    That's the exact one I use. Works like a charm!
     
    gForceDude likes this.
  18. Mar 6, 2021 at 6:50 AM
    #18
    Beshaw1221

    Beshaw1221 [OP] Well-Known Member

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    Perfect
     
  19. Mar 6, 2021 at 7:07 AM
    #19
    gForceDude

    gForceDude High Miles & Big Smiles

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    ECU Update 04B81 265/75/R16C Shoes Happy & Content
    The Official Toyota Instructions for an ECU Update/Flash require a battery maintainer, for good reason.

    https://www.tacomaworld.com/attachments/tsb-0134-16-ecu-flash-instructions-pdf.4048047/

    "Battery voltage MUST NOT FALL BELOW 11.8V during reprogramming."
    "The DCA-8000 battery diagnostic tool MUST be used in Power Supply Mode to maintain battery voltage at 13.5V while flash reprogramming the vehicle."


    If the battery voltage falls below 11.8vdc during a flash, the update will fail, and you may 'brick' your ECU as a result.

    Most never even read the above Official Toyota Instructions before doing their first flash - ignorance is bliss, at least until the battery does indeed fall below 11.8vdc, and the ECU is rendered useless and the truck won't even start (this happened here just recently). Do you feel lucky?

    I wear a seatbelt when I drive, just in case; and I use a battery maintainer when I flash, just in case.
    It is also a very good tool to have, for lots of uses besides just flashing.
     
    Last edited: Mar 6, 2021
    ktbell444 likes this.
  20. Mar 6, 2021 at 7:49 AM
    #20
    Beshaw1221

    Beshaw1221 [OP] Well-Known Member

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    Thanks so much
     

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