On the 02-04 Honda K-series engine harness, there are only two ECU connectors.

Connector A (contains 31 terminals)

Connector B (contains 24 terminals)

The third connector is C101 and it connects to your K-swap conversion harness. Disregard this connector as it does not connect to the ECU.

If you do not have an engine harness,view them here.

On the K-Series conversion harness, there is only one ECU connector, connector E. Depending on the model and year harness, there will be a few wires that come out of this connector.

Connector E (contains 24 terminals) - Do NOT confuse this with Connector A.

If you do not have the Hondata KPRO, view it here.