I don't have a '97 FSM, but my '95 has no such code. If you mean code P0401, (EGR flow test failure) which it sounds like from your description, let me know and I will scan and post the diagnostic procedure for you.
If this is the problem, the only fixes seem to be:
clean the EGR and passages or change it out,
fix short in ckt 435
change out PCM,
There is also a note that says: if dtcs p0101 or p1406 are set with dtc p0401, diagnose and repair in the following order: 101, 1406, 401
If you already have an FSM, I have no other ideas.