Circuit Opening Relay
WARNING: This page is about a different variant/trim than selected.
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.
On Pickup, T100 3.0L and 4Runner fuel pump switch in airflow meter provides ground for circuit opening relay. On all other models, circuit opening relay is grounded by ECM through the FC terminal.