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As far as the 4th gen USDM prelude goes the ECU has nothing to do with the 4ws. I have a 93 Si 4ws that had a 3 plug p14 in it. I did the H22 swap and got a P0F accord ECU with the motor. The 4ws works just as it did before the swap. Checked all the wiring diagrams in the service manual and...