Circuit Opening Relay

Circuit opening relay controls fuel pump circuit. When engine is cranking, circuit opening relay receives a start signal.

Start signal energizes circuit opening relay during cranking. Circuit opening relay then provides voltage to fuel pump.

Fuel pump switch in airflow meter provides ground for circuit opening relay. On all other models, circuit opening relay is grounded by the ECM through the FC terminal. Circuit opening relay and fuel pump relay are located in different locations. See Figure and Figure.