The PCM receives power through multiple circuits, often fused individually for different aspects of its operation (e.g., main power, memory retention, etc.). These circuits might use various relays in the underhood fuse box for switching, but they aren't specifically labeled "PCM Power Relay." The relays involved might be part of larger systems controlling other components and functions, with the PCM simply drawing power through them.
Therefore, there's no single part you'd find labeled as a "PCM Power Control Relay" for a Ford F-150. Diagnosing PCM power issues requires tracing the power supply circuits back to the fuses and relays involved, which varies slightly depending on the year and model of the truck. A wiring diagram is crucial for accurate troubleshooting.
