I did the magic handshake to get the code off (found here: http://www.subaruout...codes-dtcs.html), and it's a code 76, which means " 2-4 brake duty solenoid. Detects open or shorted output signal circuit."
I pulled off the air intake duct/chamber, and unplugged the transmission control unit's plug, and did some quick tests based of the factory service manual.
Here are the two things of interest from the fsm:
One thing I noticed was that there are 3 pins missing on the male end of the plug. 2 are listed as not connected in the FSM, but the other is listed as the "Torque Converter Turbine Speed Sensor". There is not even a wire running to that spot, so I can only assume my model does not have one.
Edit: Removed most of my incorrect troubleshooting. Would just confuse people in the future
There are two typos in the FSM. First off there are two pin 6's on the manual. The ground should be labeled "16". Second off, the picture makes it look like you can measure from the female side of the harness. This measures back towards the TCU and won't work at all. You want the male side (which is incredibly hard to reach). It's much easier to pull the plugs out of the TCU and probe from there.
The TCU plugs are b54 and b55 in the DIAGNOSTICS section of the FSM.
Edited by cegli, 02 February 2013 - 10:50 PM.