Devin and Turbo3,
Thanks, you saved me a lot of trouble. I just plugged the ELM327 I thought was defective into my Leaf, paired my Android phone with it (again, no passcode required), turned on the Leaf Spy Lite app, went into settings and switched to Port 16, exited the Leaf Spy Lite app and restarted, and viola, it connected and I was able to see the data. After a while of monitoring it and seeing it was stable, I upgraded to the paid Leaf Spy app and it still works.
By the way, my Approximate Remaining Battery Capacity (the number in parentheses at the top of Screen 1) says 90.49%. This was the key number I was looking for in purchasing the ELM327 device and installing the app. Does this mean I should expect 281 x 0.9049 = 254 gids at full charge? I rarely charge to 100% so am looking to calculate the value rather than measure it. The battery health seems OK for 29k miles and 28 months, but given I live in Seattle and have babied the battery I was hoping for a little more.
2011 Nissan Leaf SL
As of 21 September 2014: 43,488 miles
Lifetime miles/kWh: 4.5
Remaining Battery Capacity: 55.8 AHr (85%)
4.4 kW PV array @ home generating 4,200 kWh/year