996 Tacho Not Working

Discussion in 'Newbies Hangout' started by Dallypro, Jun 14, 2025.

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  1. Did you take the plug boot off? Terminals are numbered.
     
    #121 Marcoduc, Nov 10, 2025 at 11:59 AM
  2. and if you look with a strong light and maybe magnification, I think the numbers are moulded into the body?
     
    #122 Chris, Nov 10, 2025 at 12:04 PM
    • Agree Agree x 1
  3. I replied but deleted as it was confusing things

    Ok, 100% the Tacho is coming from PIN 24 not 12

    I was counting them the wrong way
     
    #123 Dallypro, Nov 10, 2025 at 12:05 PM
    • Like Like x 1
  4. Snip the cable ties get the boot off and look other side of plug.
     
    #124 Marcoduc, Nov 10, 2025 at 12:08 PM
  5. Ignore my picture. (Trying to do this on my iPad!!!!)
    The counting goes bottom left pin 1. Then down to bottom right for pin 19.
    IMG_1564.jpeg
     
    #125 chrisw, Nov 10, 2025 at 12:11 PM
  6. Not the best of images

    IMG_1565.jpeg
     
    #126 chrisw, Nov 10, 2025 at 12:17 PM
    • Like Like x 1
  7. Well done for spotting that one chrisw.
     
    #127 Marcoduc, Nov 10, 2025 at 12:20 PM
    • Agree Agree x 1
  8. Yeah, that's a great spot! Clears up a question mark.
     
    #128 Dallypro, Nov 10, 2025 at 12:30 PM
  9. I'll take it back what I said about wiring diagrams, sorry Haynes!
     
    #129 Marcoduc, Nov 10, 2025 at 12:37 PM
  10. And therefore.......

    If anyone in South Wales, South West (or within realistic distance of south West Wales) has a 996 Bioposto with a 16M ECU apart for servicing this winter and wouldn't mind a few swap and changes of ECUs and tachos for fault finding....let me know!
     
    #130 Dallypro, Nov 10, 2025 at 12:37 PM
    • Like Like x 1
  11. While your waiting for parts, you can now test the circuits correctly, so you can prove it?
     
    #131 Marcoduc, Nov 10, 2025 at 3:34 PM
  12. Wiring diagram in .pdf
     

    Attached Files:

    #132 chrisw, Nov 10, 2025 at 4:38 PM
    • Like Like x 1
  13. I love this place. I’d never attempt any of this but the font of knowledge and help here is amazing. :upyeah:
     
    #133 bigjimmyb, Nov 10, 2025 at 6:35 PM
    • Agree Agree x 1
  14. I completely agree!

    I'm a bit out of my depth, but enjoying the challenge. As someone said, When (not if) this get fixed.......very much a team effort.

    That is unless its something completely stupid at which point i'm becoming a ghost!


    I think all the testing to date is still relevant, however i may try and mock up a direct from ECU tacho cable and see if i can get some life that way.
     
    #134 Dallypro, Nov 10, 2025 at 6:40 PM
  15. Fair play to you mate, I'd have taken a match and petrol to the bastard by now :joy:
     
    #135 bigjimmyb, Nov 10, 2025 at 6:41 PM
    • Funny Funny x 2
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