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a float is not 5v. A float is a non connect and is theoretically 0v. I say theoretically because noise can be picked up to make a small voltage. That's why it's not good design practice to use a float as a signal of a low state.
The ECU signal path has a pull up circuit. Because it has a pull up circuit when it is disconnected from the tcu instead of floating it is held at 5v and there is no need to connect it to an external signal.
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