4 Wheel Drive/SUVs: 94 Wrangler Seirra Edition, haynes manual, error code 12

Question
My jeep will crank over (starter engages) but is getting intermittent electrical signal to the coil.  I have changed the coil, cleaned all ground connections, checked the coil wires (leads) for shorts, and replaced cap, rotor and wires.  Running a self diagnostic I get a 11(ignition) and 12 code.  My Haynes manual does not show a 12 code for a 94 model wrangler but for a 97 and later models a 12 code is "Battery Power to PCM was disconnected".  Could this be the same code for a 94 model or do you know what a 12 code is?  Do you have any idea of what else could be the problem?  Additional info...when the jeep starts, it runs greats and has never stalled out while driving.  I am at a loss, can you help?

Answer
Darren,

According to my book, an error code 12 states "Problem with the battery connection.  Direct battery input to controller disconnected within the last 50 ignition key-ons."

Check all battery connections, and (especially) all ground wires and connections.

Without working on it myself, these are the best suggestions that I can give you at this time.

If this doesn't work, you may have to take the Jeep to a reputable shop, and have them run a diagnostic analysis.

Carl