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Old 06-16-2019, 07:16 AM   #250
Anker
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Join Date: Sep 2016
Location: Stow, MA
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Garage
I'm too lazy to dive into it, but I believe it is much more complicated than this. The various systems communicate with one another through the CAN bus on late 986es and before that I also believe that they communicated with a protocol rather than by simply setting voltages on pins.

So the engine will refuse to start unless the immobilizer sends a message over the CAN bus (or earlier bus) that it that it is OK.
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