Mazda Protege Repair Question
Check Engine Light
I have never heard of a disable function. However on some models, if the MIL is not on like you discribe, the bulb is either burned out, or it may indicate a problem with the PCM itself.
I would try a new bulb first, and if that doesnt fix it, you can always remove a sensor plug and try and induce an engine code to see if it comes on. One thing tho, if you get a code, you will need a way to clear the code.
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It may be a burned out bulb but I do have fault codes that come up when the engine is checked but the check engine light isn't ever on.
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