This 2000 Ford Expedition was towed in due to a no run condition. I checked for codes and found that I had no communication to the Powertrain Control Module or the Instrument Panel Cluster. I also noted that the odometer was displaying dashes.
I decided to start checking power at the PCM relay. It is the square relay in the upper left corner of the following picture.
I removed the relay and checked for power input at terminal #30. Power was present.
I jumpered terminals #30 and #87 together and checked to see what I had. The dashes in the odometer display turned back to numbers. Jumping out relay terminals is a very exacting procedure and if done incorrectly the computer control unit (PCM) can easily be damaged. I now had data for the PCM and The IPC. The engine would now crank and run but it would shut off after a few seconds. I checked and cleared all codes and now the the engine would crank and run normally.
I also went ahead and changed the fuel pump relay as a preventative maintenance service. It is the square relay in the bottom center of the following picture.
