Almost no instructions but I have two other OBDII readers so they can't be much different. I plugged it in, turned the key to the ACC position and the gauges on the dash started flashing and the sensors started going up and down. Powered off, disabled everything and tried again with the same result. I turned it off again and tried the key without the reader and everything was fine. 2019 Freightliner XCM, Cummins ISB 6.7L, 9-pin J1939 connector.
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