[PDF] VTEC AIR FLOW CONVERTERⅡ - apexi-usa Connecting the VAFC II 1ve the negative (-) terminal of the battery. advice! ！ CAUTION 2te the Engine Control Unit (hereafter referred to as ECU) of the vehicle by referring to the Wiring Diagram by Model. 3ect the harness attached to the V-AFC II securely to the power cable of the vehicle VAFC Archives - APEXI Knowledge Base All wiring diagrams that we have are listed in the wiring diagrams for the product. We use ALLDATA as an online reference. It is also recommended to get wiring schematics from any workshop manual like Haynes or Chiltons or try calling your local service dealership for information.