CONTROL Before engine start, the MASTER switch is OFF, the LP valve and the PRSOV are closed. When the MASTER switch is set to ON, the LP valve opens and the EEC controls the PRSOV to open by.The EEC controls the fuel flow through the metering valve in response to the throttle control lever demand or to the auto thrust system command. Engine normal shut down is done by setting the MASTER switch on OFF which closes the LP valve and the PRSOV directly. The EEC can also close the PRSOV automatically in case of automatic start abort on ground.MONITORING For fuel system monitoring and ECAM indication, the EEC uses the following sensors: - the fuel flow transmitter for fuel flow and fuel used indications - the LP fuel filter differential pressure switch for filter clogging indication - the fuel low pressure switch for fuel pressure monitoringTo monitor the metering valve and the PRSOV positions, the EEC uses sensors inside the FMU.