Mk2 Scirocco 1.8 20vt with DTA ECU - Tacho/ Speedo questions

Discussion in 'Throttle bodies & non-OEM ECUs' started by J66KE B, Oct 5, 2016.

  1. rubjonny

    rubjonny Administrator Staff Member Admin

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  2. sparrow Paid Member Paid Member

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    They're definitely not soldered.
    Make sure you cover the window on the chip up, so that it doesn't get corrupted.
     
  3. J66KE B Forum Member

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    haha well believe it or not I'm actually passing by Bracknell today and tomorrow as I'm working in Ashford tomorrow morning! (staying there tonight)

    Slim chance but are you around tomorrow around mid-afternoon? If not I'll have to suffer the 30 and add that shiny tool to the collection lol

    [​IMG]
     
  4. Toyotec

    Toyotec CGTI Committee - Happy helper at large Admin

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    ECU code is in the EPROM. You cannot easily write to that without a UV burner.
    Your map is stored in the SDRAM, which has a battery. If the battery has past it's shelf life on the SDRAM, you will not retain memory on key off or worse the map will be corrupted.
    Removal of the SDRAM, ment taking to ECU to a specialist as the circuit tracks can get damaged during removal.
     
  5. J66KE B Forum Member

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    Hi Toyo thanks for the reply.

    When you say "ECU code" do you mean the firmware or something else?

    I have an EPROM programmer (link here) which lets me write the firmware to the chip. I don't plan to remove or do anything with the SDRAM.
     
  6. Toyotec

    Toyotec CGTI Committee - Happy helper at large Admin

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    The Eprom tends to be fine.
    The SDRAM holds the calibration map and firmware level or the bits you the user can change.
     
  7. J66KE B Forum Member

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    MAJOR UPDATE

    I took Jon up on his offer the other week and made a detour to Bracknell whilst on my travels so he could take a look at the chip. Unfortunately as the chip sits too close to the SDRAM block it meant Jonny's shiny chip puller wouldn't fit :thumbd: He then tried using some regular tweezer-type chip pullers but the b*strd thing just would not budge!

    Exhausting all other options he engaged hawk-eye mode and spotted where it was all going wrong..see pic below, notice a tiny white dot, this is the reflection of the flash on a line of glue that runs the length of one side of the chip socket.

    [​IMG] [​IMG]

    Picked up some scraper blades...fit like a glove & worked a treat. After the glue was removed the chip came straight out without the need for too much force.

    [​IMG] [​IMG]

    Add in one pre-programed chip that I made earlier and voila, here is the result (click for video) [:D] For anyone who's interested I'll get around to posting a guide on EEPROM flashing at some point. But thank you all for the advice and help on this issue, we got there in the end lol

    [​IMG]
     
    sparrow, beetie and rubjonny like this.

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