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 ignition is turned on, voltage is supplied 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 energized, circuit opening relay then provides voltage to fuel pump relay for fuel pump operation. Circuit opening relay is located in relay box. See the CIRCUIT OPENING RELAY LOCATIONS  table. See Figure.