Details: After retrieving the DTCs, the
technician checked power to the ignition fuses. He found that
there was battery voltage on many of them, even with the ignition
switch turned off. Next, he pulled one fuse at a time to
determine if there was a “short-to-power” issue coming from
another circuit. When he pulled the #8 or #24 fuse, the other
fuses lost power.
After reviewing the schematic, he found that the only thing the
two fuses had in common was connector C103, located next to the
PCM. He inspected the connector and found both sides of the
connector to be corroded and melted (see images).
Confirmed Repair: After replacing connector
C103, the engine could then be shut down when the key was turned
off. All DTCs were cleared and did not come back. Problem fixed!