Dokta:
I have checked the items you listed ( I used a Sears Craftsman autoranging multimeter, model 82007):
-coupler #3/crank sensor: I got no ac voltage while cranking the engine over with the starter.
- coupler A: pin #1 (#1 at coil): continuity to coil and 12 volt dc at EZL.
pin #2 (#31 ground): continuity to ground.
pin #3 (#15 at coil): continuity to coil and 12v at EZL.
- coupler B: pin #6 (#31 ground): continuity to ground.
It looks like maybe I have a bad crank sensor?
Cary.