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2018+ TPMS Codes finally cracked.

Discussion in '2.5 Gen Tundras (2014-2021)' started by Jeff_5_7, Mar 26, 2022.

  1. Sep 11, 2023 at 4:51 PM
    #31
    azTony

    azTony member since sept, 2017 and over 1,600 messages

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    *** OV Tune Order #4481 *** ECU 0CN21 ***
    2018 Tundra Platinum with Icon Stage 9 w/3.0 and billet UCA, Harrop Elockers, 5.29 on 37’s
    So... does anyone know how to get the 5th tire position to point to SP for spare? I think/hope that if that can be changed then I could be prompted to enter a 5th tire ID when registering. Not wanting to get Techstream out each time I rotate 5 tires and have to keep track of each ID. Well I guess Discount can do that each time but I seen it on YouTube with other vehicles (Yaris was one) that you could enter 5 ID's and have 2 sets of ID's, one for summer and one for winter tires.
     
    rodm1 likes this.
  2. Sep 11, 2023 at 5:57 PM
    #32
    bfunke

    bfunke Tundra Curmudgeon

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    @Jeff_5_7 - you’re not with Biodynamics Research Corporation are you? I have some friends that worked there.
     
    Jeff_5_7[OP] likes this.
  3. Sep 11, 2023 at 6:03 PM
    #33
    Jeff_5_7

    Jeff_5_7 [OP] New Member

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    No but we work with them at times, they know of our company. We do more of the speed, impact location, change in velocity stuff and they do more of the how bad are your injuries actually. Validate the medical claims.
     
  4. Sep 11, 2023 at 6:04 PM
    #34
    Jeff_5_7

    Jeff_5_7 [OP] New Member

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    My assumption is that the TPMS ecu can store 5 it will just require some programming signals sent to the ecu that Techstream can’t do. I have read about a guy programming his for 5 from 4 using very specific messages on the communication network.
     
    bulldog93, rodm1 and azTony[QUOTED] like this.
  5. Sep 12, 2023 at 5:38 AM
    #35
    azTony

    azTony member since sept, 2017 and over 1,600 messages

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    2018 Tundra Platinum with Icon Stage 9 w/3.0 and billet UCA, Harrop Elockers, 5.29 on 37’s
    Do you have a link to what you read?
     
  6. Sep 12, 2023 at 8:07 PM
    #36
    Jeff_5_7

    Jeff_5_7 [OP] New Member

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    I spent the last few days testing this and finally figured it out this evening. I have a 2014 TPMS ecu I experimented with first.

    It uses an older KWP protocol and it took a lot of reverse engineering with Techstream but I was able to program it to 5 tires.

    AA276BD3-A8AE-4DC6-9136-DC09B745AFAE.jpg

    After that I was able to put the 2018 TPMS ecu on the bench and play with it. It took a while also but I found a reprogramming CAN messages to switch from 4 to 5 tires.

    8417131D-B1C0-4BDF-9A10-6053051D630C.jpg

    Once I had it set to 5 tires I used the Techstream write location utility to set the 5th tire to the spare.

    6D6D2C75-EF1E-4231-9D5C-9AFE4E587367.jpg


    All of this was done with custom communication messages, there is no option in Techstream.

    Now the only question is will the newer one display all 5 on the cluster. I have no way to test that currently I don’t think but I will play with it more Tommorow
     
    bulldog93 and azTony[QUOTED] like this.
  7. Sep 14, 2023 at 5:50 PM
    #37
    rodm1

    rodm1 New Member

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    That is just sweet! Would love to mod the cluster!
     
    Jeff_5_7[OP] likes this.
  8. Sep 14, 2023 at 6:17 PM
    #38
    Jeff_5_7

    Jeff_5_7 [OP] New Member

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    If someone wants to mail me there TPMS ecu out of a 2018+ I can set it or 5 tires and we can see if that makes the 5th one come up on the cluster screen.

    Assuming yours shows the factory four already.
     
  9. Sep 14, 2023 at 6:18 PM
    #39
    Tundra Enthusiast 5.7L V8

    Tundra Enthusiast 5.7L V8 New Member

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    I have a spare one
     
  10. Sep 14, 2023 at 7:07 PM
    #40
    e30cabrio

    e30cabrio I'm e30cabrio, I'm a modaholic

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    Will this work on my 2013? Do I need to get an 18 TPMS ECU to do it?
     
  11. Sep 15, 2023 at 6:57 AM
    #41
    e30cabrio

    e30cabrio I'm e30cabrio, I'm a modaholic

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    #41

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