Ford Repair Questions? Ask a Mechanic for Answers ASAP
Hello, P1633 indicates a loss of power to the Keep Alive Power circuit for the PCM. Is this a hard fault code No other codes stored? Did you have this problem before you changed the plugs and wires?
Fuse 1.18 as shown in the diagram im attaching is a single fuse to pin 55 of the pcm that is for the keep alive circuit, see if its blown first