Hi !
I'm from Portugal and I have a friend with a Prelude Vtec, he have a H22A engine (the seller say it's JDM) and bought a OEM ECU from UK, but it appears Knock Sensor Error code.
The old ecu is from a civic with a weird program, but does not appear any error.

 

The p28 civic ecu probably has knock sensor function disabled. If you're getting a knock sensor code and the wiring is ok, you probably need to replace it. That part has been known to have problems in H22's.