90 MAP system Code 43 help needed

[mike.hoenes at ncmail.net]

I need a guru on this one.
 My ECM is setting a code 43 - which on this setup is indicative of something wrong
with the Knock Sensor circuit.
I have replaced the sensor, the ECM, the distributor pickup, checked all the wiring,
and I have checked all the "sense" voltages in the Knock Sensor circuit. All the
voltages indicate that everything is normal and that it should not set the code.
Does anyone know of another reason it sets a code 43?
The system worked fine for about 6 months beofe it started setting the code.

TIA
mike

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