Circuit Opening Relay
Circuit opening relay controls fuel pump circuit. When EFI main relay is energized, EFI main relay provides battery voltage to circuit opening relay. When engine is cranking, circuit opening relay receives a start signal which energizes circuit opening relay. When circuit opening relay is energized, circuit opening relay then provides voltage to fuel pump relay for fuel pump operation. When start signal is released from circuit opening relay, the circuit opening relay ground circuit is controlled at Engine Control Module (ECM) terminal FC.