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I disconnected the L line after connection was made, and the behaviour was not good. I noticed the LCD backlight was off and on, Trip data was being saved, and readings were incorrect. Reconnected the L line (which at this point was ONLY duplicating the K line data.)
As it is right now, the 33290 chip drives the K line to 12 volts. I take that, and split it to the L line. This seems to function fine.
If I created another pin to bit bang the init from the arduino, it would proceed at only 5 volts. Hmmm... actually I DO have another two 33290 chips. I could make one chip the K line, the other the L line. That might work... hmmmm
As for the turning off and on, I have not done a full test on this, but it looks like the OBDuino does not try to keep the communication active once the engine is off. Once the engine is ON again, the 9141 is not reinited, and thus, no RPM is read, thus OBDuino does not 'turn on' again... it stays in quiet mode... even if the car is running.
I tried version 131 and it did not succeed in connecting at all. The ISO changes in 138 are required for my car.
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