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Thread: Odometer on a digital display.

  1. #1
    Maximum Bitrate stonestatue's Avatar
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    Odometer on a digital display.

    I intend to replace my gauges with an lcd screen managed by the carputer for a completely digital gauge interface. Is there a way to interface the car's ECM with the carputer somehow to show the correct mileage, or will I need to manually start that off?

    The vehicle I intend to go with is going to be an early 90s Chevy G20 conversion van or a late 90s conversion van (Ford Econoline, Dodge Ram Van, or Chevy Express/GMC Savana).
    Check out my GMC Savana worklog.

    Remaining tasks to facilitate vanputer installation codename "Enterprise":
    - Edit skin to liking.
    - Get compatible phone for mobilephone.net.
    - Facilitate HVAC control.

  2. #2
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    Bugbyte's Avatar
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    That is a pretty advanced topic. Interfacing with the ECM is a pretty car-specific project.

    Keep in mind that if it is too early a model, you will be working with OBDI rather than OBDII.

    Just a thought, if you can figure out the inputs to the odometer LCD itself, you could 'read' the figures on it and relay those to your PC. It's beyond me how to do this, but I'm sure it can be done.
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  3. #3
    Maximum Bitrate stonestatue's Avatar
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    Well I got the idea when I had a 1988 Cadillac Seville. That and my current car, a 1993 Lincoln Town Car, both have digital gauges. and that includes the odometer. I know standard odometers advance mechanically by being linked to the speedometer and it turning. I figured that a digital odometer gets its data from the ECM, hence the mileage is permanently saved in the ECM. However, I could be wrong about that.
    Check out my GMC Savana worklog.

    Remaining tasks to facilitate vanputer installation codename "Enterprise":
    - Edit skin to liking.
    - Get compatible phone for mobilephone.net.
    - Facilitate HVAC control.

  4. #4
    Variable Bitrate Saab9-5's Avatar
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    A digital odometer gets its data from the ECM but, generally, its not saved in the ECM. On most digital instrument clusters, its either stored in a separate EEPROM on the instrument cluster or in the EEPROM of the instrument cluster controller. In some cars, a copy is stored in the ECM for "security" purposes.

    The website http://www.tachosoft.com/ can let you look up a vehicle and find out where its stored.

  5. #5
    Variable Bitrate 84RegalRider's Avatar
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    good luck with that.
    i got a 1991 towncar and its going to be a pain to get it to interface with the carputer.
    only thing there is a product called tweecar and thats like 500 bucks, and you will still need to hack to get odometer reading.

    its not that easy like the GM ALDL is.

    1984 regal before, now a 1991 towncar.
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  6. #6
    Maximum Bitrate stonestatue's Avatar
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    You have a 1991 Town Car? I have a 1993 Town Car. Is your dash all digital? The kind of dash in my town car is all digital, and I would settle for that kind of dash if the car I'm transferring to had one.
    Check out my GMC Savana worklog.

    Remaining tasks to facilitate vanputer installation codename "Enterprise":
    - Edit skin to liking.
    - Get compatible phone for mobilephone.net.
    - Facilitate HVAC control.

  7. #7
    Variable Bitrate 84RegalRider's Avatar
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    it is digital that outputs to an analog needle, so not what you are thinking off. haha
    oh yea so that reminds me, the odometer has to sent a voltage to update the clicker, so a way you could do it is just to input ur current mileage and have something read the voltage "clicks" that would normally update the odometer, but if u ever run it with no dash on you might have issues etc etc.

    Really it sounds like you are in over your head, there isnt an easy way to tap into the ecm on these cars(at least not a cheap one), and even then its going to take a bit to get it working just like a regular dash.
    Core duo
    1tb harddrive
    256 ddr
    8 lilliput
    bu-353

    still installing...

  8. #8
    Maximum Bitrate stonestatue's Avatar
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    It's not the Town Car I'm tapping into. I'm going to get a conversion van, probably late 90s or early 2000s.
    Check out my GMC Savana worklog.

    Remaining tasks to facilitate vanputer installation codename "Enterprise":
    - Edit skin to liking.
    - Get compatible phone for mobilephone.net.
    - Facilitate HVAC control.

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