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Thread: Can temp gauge be recoded for true reading?

  1. #1
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    Can temp gauge be recoded for true reading?

    Hi

    As many readers may know, the water temperature gauge on the Mk 1 TT (as well as most other Audis I believe) displays not the actual temp of the coolant but is 'weighted' to display 90 deg C if the real temp is in the range 83 deg to 98 deg (or somewhere close to that range).

    You can of course read the actual temp either through vcds or through the display on your HVAC head unit, but I want to be able to get a true reading from the gauge itself.

    I read somewhere recently that the gauge can be recoded to display the real temp (this makes sense as presumably the data from the sensor is manipulated in the ecu - so it can probably be un-manipulated). Unfortunately, there was no detail.

    Anyone know if this can be done through vcds? I did a search of this forum but found nothing directly related.

    Thanks all

  2. #2
    Verified VCDS User NZDubNurd's Avatar
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    I doubt it.

    You'd need to read the eeprom file of the cluster, find the HEX that relates to the gauge and modify it to suit (or something similar).

    I've done it on an E39 BMW, but that's a completely different beast (Duh!). Someone else found which part of the code altered the gauge and I followed their procedure. Once someone had spent craploads of time sorting out the details, it's really simple to do

    If you work it out, let us know

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  4. #3
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    Mainly this "feature" is built in in every car's instrument cluster. I guess engineers at factory made this to avoid mass of drivers flooding workshops with temperature related questions: "why my engine works all the time on 85 degrees, not exactly 90?" or "I'm afraid, my engine is overheating, it shows 99 degrees" etc. In general gauge at cluster shows 90, when real temperature is from 75 to 100 degrees C. Probably it is easier to add separate extra sensor and extra gauge than dig into software of cluster and try to change it.

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