The PCM is the vehicles main Computer. I believe its mounted in the firewall (passengers side) above the AC unit under hood. If the fuse blows as soon as you install a new one, I'd suspect either the PCM Power Relay points are stuck closed (due to short) or the short is between the fuse and the Relay in the power distribution box.
This fuse supplies 12V power to the PCM, fuel pump relay, fuel injectors, purge flow sensor, IAC valve, MAF sensor, EVAP purge valve, EGR vacuum regulator via the PCM Power Relay.
Last edited by Rev; 07-12-2009 at 11:07 PM.