Fuel Pump Relay: Description and Operation

Circuit Opening Relay Circuit Schematic:

PURPOSE
The Circuit Opening Relay is responsible for providing power to the Fuel Pump.

LOCATION
Located near the ECU.


OPERATION
Power is applied to the STA terminal of the relay from the starter when the ignition switch signals cranking mode. This allows the fuel pump to operate until the engine starts and runs under its own power. A signal from the Air Flow Meter (FC), keeps the relay closed until the ignition switch is turned OFF and de-energizes the EFI Main Relay. The fuel pump operation is then interrupted.