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Being old thread so this info won’t help mscherst but may help others. I’m having the same no start problem with a 1998 civic after rebuilding the head and haven’t solved it yet. Anyway, the manual is very poorly written. It is factually correct but severely misleading. The 12 volts on A20 actually comes from the ICM module as I found out afterwards. It is waiting to receive ground to activate its circuit and ground the coil. Way down in the manual (11-34 for me) is a diagram showing A20 (and the injector outputs) connected to NPN transistors such that when the transistor is turned on whatever is on the pin will be grounded. My ECM is not grounding the ICM or the injectors which is (was) probably also the case with mscherst.
I have checked all grounds/voltages/wires several times. I have viewed the CKP/TDC/CYP distributor traces, tried a different ECM and a rebuilt distributor all to no avail. Wonder if mscherst ever solved his problem? These threads seem to die out with no resolution. If I ever get this thing started I will post my solution.
jvf