TC mods rely on programming that says with certain changes in resistance of the coil, the temperature will be x. Kanthal wire is not a good material for this as it's resistance doesn't change noticeably with temperature. However, Nickel (Ni), Titanium (Ti) and Stainless Steel (SS) - the currently used TC materials - do have this quality. They change resistance on a scale in correlation to their changing temperature.
Because of this, the TC mod's board is programmed with this information so that when these materials are used for heating coils, the mod can read these changes in resistance and make on-the-fly adjustments to the power being delivered to the coil in order to limit the temperature to what the user sets.
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