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Thanks Sama. I'll be waiting for any info you can gather. This is my interpretation so far regarding the hardware layer. I think OBD-II has a few different hardware protocals. One of these include ISO9141 which you can generate from the standard COM port from a PC and level shifter I mentioned before. I do this at work for ECU's we develope for a certain car manufacturer. I believe my 96 G20 has this hardware protocal also. I've heard about other car makers using a PWM based hardware protocal. I can only guess this one would require a smarter external circuit.
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