Many problems are caused by an incorrect approach to engine swaps. The simple
logic is that the ECU was designed for use in an 02-04 RSX, so if you follow the
RSX wiring it will work.
Tech - K20 Transmission swaps.
explains the differences between 02-04 transmissions and the later 05-06
Tech - K20A Engine Swap Wiring explains the
main wiring process and issues for engine swaps.
Tech - K20A Engine Swap Grounds shows
what ground straps are needed and how the battery should be wired up.
Tech - K20A Engine Swap Fan Switch explains
where the fan switch should be placed.