Yes, I understand and I will post my GM documentation when I find it. The Mefi4 is very very similar to the obd1 LT1 computers electronically and when I need to convert a 4 into a 4a or 4b this is how we get it into boot mode for programming the entire 256k and not just the calibration data, and yes, still ground for diagnostic mode. Maybe this doesn't work on the LT1 computer but I bet it does. I only have obd2 LT1 puters here or I would already know :)
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