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Success!!! (Well not a full success - but OBDuino did communicate.)
Ok, the Toyota Matrix requires the L line to initiate ISO 9141 communications!
Absolutely no communication will proceed without the L line chatter.
I noticed that the K and L lines do exactly the same data routine when using the L, so I simply jumped the two lines.
Plugged the unit in, LCD lit up, and unit failed to init. Turned the key to accessory, and unit connected and the screen when to the PIDs.
Turned the ignition, and data started showing up (gas was being used.)
Now... Turned the ignition off, and the trip data was saved. LCD backlight turned off.
Turn the ignition back on, and LCD backlight did not return on, and data was not updated.
Reset the OBDuino, and everything was then hunky dory....
This is using version 138. I don't know if the failure to resume is the L line, or if there is another defect somewhere. Does anyone else have a problem with reconnection after shutting off the car using 138?
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