I have a 2004 Ford Taurus (DOHC Engine). Recently, I blew a fuse, located in the engine compartment. My OBDII scanner read a DTC P1633 (Keep Alive memory voltage too low) and a freeze frame data...
...
Fuel System 1 OL
Fuel System 2 CL-Fault
...
The fuse that blew up, Fuse 22, serves the AC clutch relay, Idle Air Control valve and VBATT (vehicle battery supply) for the PCM (power control module). I already replaced the IAC and have isolated the AC circuit and still, the fuse kept blowing up. I also checked for short-circuit in wires and found wires are good...

Does anyone knows what the above freeze frame data means?

I am certain that the PCM is intermittently pulling in high current. If I replace the fuse, I can drive the car and the PCM will clear self tests then all of a sudden, the fuese will blow again.

....my next step is to replace the PCM...but it's quite expensive ($800...). I am not sure if the fault is inside PCM or outside. I want to confirm that PCM is bad....any suggestion. thank you.