ECM controls ON/OFF operation of the fuel pump by turning it ON via the fuel pump relay under any of the following condition.
-For 3 seconds after ignition switch ON.
-While cranking engine (while engine start signal is inputted to ECM).
-While CAS signal is inputted to ECM.
So with that being said, it sounds like the first 3 seconds is working fine. But no power in the start mode leads me to belive there may be a problem with the engine start signal. Check pin B11 on the PCM to see if you receive 6-10 volts with the starter engaged. This is used for the start signal. If the ECM is getting that signal, but not running the fuel pump, it is probably bad.
Have you tried to supply power to the pump circuit and get the car started? This would eliminate the CAS crank angle sensor which supplies the signal while running.
Monday, August 7th, 2006 AT 5:11 PM