Circuit Opening Relay
WARNING: This page is about a different car, the 1995 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
Circuit opening relay is used for the fuel pump circuit. When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay. Fuel pump control side of circuit opening relay ground circuit is controlled at Engine Control Module (ECM) terminal FC. When circuit opening relay is grounded, the contacts close, providing voltage to fuel pump for fuel pump operation. Circuit opening relay is located in relay box.