Removing a tachograph

  1. Ped

    Ped Member

    Messages:
    162
    Stamford, uk
    I'm looking at an ex council Mercedes Sprinter on Wednesday that has a digital tacho fitted. It's a MWB model under 3.5t so I'm not really sure why it has one unless it was used for towing maybe.

    I don't need the Tacho as it's going to be a camper van. Does anyone know if they are difficult to remove? I'm guessing you can't just unplug it as I think it governs the speed etc. that's about as much as know about them. Ha!

    I've seen this dummy head unit
    http://vdotachograph.co.uk/dummy-tachograph-simulator/

    Presumably this reroutes all the connections for you but I'd rather remove it altogether if possible. Or it such a minefield that I'm better off looking for a different van?
     
  2. 8ob

    8ob Forum Supporter

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  3. Ped

    Ped Member

    Messages:
    162
    Stamford, uk
    Thanks! I didn't know you could have the speed limiter re calibrated tbh. Is that something a local garage can do? Or is specialist?
     
  4. 8ob

    8ob Forum Supporter

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    moscow on thames
    No problem to re calibrate, try your nearest truck garage and they will point you at a Tacho centre. Or just pull the fuse on the limiter.

    Bob
     
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  5. eLuSiVeMiTe

    eLuSiVeMiTe Forum Supporter

    Messages:
    8,963
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    Bedfordshire England
    Any ECU remapping place should be able to do it for you.

    My speed limiter appears to be working. Wasn't before the garage had it. Caught me out when overtaking last week.
     
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  6. m_c Member

    Messages:
    76
    Location:
    East Lothian
    It might not have a speed limiter set, as it's under 3.5t.

    If you were to remove the tacho, you might need to get the vehicle configuration changed to remove the tacho. On sprinters over 3.5t with speed limiters, I know the instrument cluster/engine module is programmed to take the speed from the tacho, and not the ABS, however I'm not sure if anything under 3.5t will be configured the same. I suspect it might be if it's a factory fitted tacho, but if the tacho has been added after, then the tacho may simply be a standalone unit.

    Easy option would be to unplug the sensor on the gearbox, and go for a drive. If the speedo still works, it's likely just a standalone tacho.
     
  7. Ped

    Ped Member

    Messages:
    162
    Stamford, uk

    I think it might be a factory fit. There's a T illuminated on the clocks and I doubt an aftermarket would have that?



    mercedes-sprinter-panel-van-diesel-273e208d156b.jpg mercedes-sprinter-panel-van-diesel-5f7fa7907688.jpg
     
  8. steviec_lj

    steviec_lj Rust Welding Professional

    Messages:
    2,380
    Location:
    Barnetby, N.Lincs
    That certainly looks factory fit. It’ll be wired in to the gearbox and god knows what else, it’s a Merc after all.

    Depends where in the country you are, but around Lincs/York’s there’s Northside Truck & Can who look after the commercial Mercedes, you’re local dealership probably won’t be interested.
     
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  9. steviec_lj

    steviec_lj Rust Welding Professional

    Messages:
    2,380
    Location:
    Barnetby, N.Lincs
    Thinking here..

    Push the right arrow to enter the menu,
    Scroll down to Entry > Vehicle
    Push right to enter and it should bring up
    OUT > Begin
    Push right to enter again

    It’ll now be Out Of Scope, so won’t sit there flashing it’s t’s off at you every 30 seconds
     
  10. Ped

    Ped Member

    Messages:
    162
    Stamford, uk
    thanks. I’m not seeing the van until wednesday but I’ll certainly try that.
     
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  11. m_c Member

    Messages:
    76
    Location:
    East Lothian
    Yeah, that looks factory fit.
    It's just a case of changing the vehicle configuration, then you can just unplug the tacho, however Merc will charge accordingly for it.
    IIRC the last time we got a configuration changed (to add speed limiters to a couple non-tacho sprinters) it was around £180 per van, as the local dealer had to request the change via Merc HQ.

    It is something any reasonable Mercedes Commercial dealer should know about, but it's often a case of finding the right person to speak to.
     
    Ped likes this.
  12. rikrobson

    rikrobson Member

    Messages:
    3,744
    Location:
    Perth, Scotland
    Can't you just pull the fuse?
     
  13. knighty Forum Supporter

    Messages:
    1,769
    Location:
    Sunderland
    if you go to a merc specialist they'll be able to plug in and sort it in 2 min

    speed limited is set in the ECU not the taco

    they shouldn't charge too much, it won't take long (they do have expensive kit to pay for) - last time I needed a van plugging in my mechanic mate told me where to go... got there and told them he sent me so they did it for free :-)
     
    Ped likes this.
  14. Ped

    Ped Member

    Messages:
    162
    Stamford, uk
    Thanks mate. Are you in Cambridgeshire or have I got you confused with someone else?
     
  15. knighty Forum Supporter

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    Location:
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    that's someone else, I'm in Sunderland :-)
     
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  16. Ped

    Ped Member

    Messages:
    162
    Stamford, uk
    Oh yeah, just noticed the bit in your profile where it says Sunderland! :doh:
     
  17. Ped

    Ped Member

    Messages:
    162
    Stamford, uk
    Update on the van, the guy who's selling has agreed to take it to a MB dealer and get the tacho removed. Should be delivered next week. :clapping:

    I know the Sprinters are prime scumbag magnets so I'm planning to fit deadlocks on all the doors. I'd also like to fit a hidden switch so I can immobilise the ignition.

    In ye olden days I'd just put a switch on the low tension side of the coil. Is there a modern equivalent? Or will the ECU throw a fit?
     
  18. m_c Member

    Messages:
    76
    Location:
    East Lothian
    The ignition is all CAN/LIN bus with an electric steering lock, so if they have the ability to get around it, any extra immobiliser isn't likely to be a problem for any thief, and is far more likely to give you more problems than it'll prevent.
     
  19. knighty Forum Supporter

    Messages:
    1,769
    Location:
    Sunderland

    I've got a deadlock I bought for a sprinter side door... but never got around to fitting it.... PM me your address and I'll stick in the post for you? - it's no good to me

    you could fit a switch and a bit relay to the starter motor coil live? - ECU won;t know any difference then

    also... look at a kit to secure the cat.... they're prime targets, lets of protection kits available - tbh you could just bolt a steel plate under the van to restrict access... that'll probably work just as well
     
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  20. Ped

    Ped Member

    Messages:
    162
    Stamford, uk
    This forum is just awesome. :thumbup:

    The van already has some security on the Cat I think. It has a sticker on the door anyway. A plate is easily made if it needs it.

    Thanks again!
     
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