The uses a Keihin ECU (specifically for the K20Z4 engine) that typically features a three-block connector configuration (labeled A, B, and C ) . This pinout is essential for engine swaps, diagnostics, or installing standalone management systems like Hondata. ECU Connector Breakdown
| Pin | Wire Color | Function | Signal Type | | :--- | :--- | :--- | :--- | | D1 | Blue/White | K-Line (Diagnostics ISO 9141-2) | Bi-directional | | D2 | Red | CAN High (High Speed CAN bus) | Bi-directional | | D3 | White | CAN Low | Bi-directional | | D4 | Green/Red | Immobilizer Communication (to Key Receiver) | Serial | | D5 | Yellow/Red | MIL (Check Engine Light) Control | Output | | D6 | Pink/Blue | Electric Load Detector (ELD) | Input | fn2 ecu pinout
The FN2 Civic Type R’s Engine Control Unit (ECU) is located behind the glove box, mounted vertically on the passenger side kick panel. Unlike older OBD1 ECUs with three large plugs, the FN2 uses labeled A, B, C, and D . The uses a Keihin ECU (specifically for the