EFI Main Relay (Camry)

The EFI fuse supplies constant battery voltage to EFI main relay. EFI main relay is energized when ignition is turned on by voltage supplied through IGN fuse to EFI main relay on vehicles not equipped with engine immobilizer system, or by MREL terminal of Engine Control Module (ECM) on vehicles equipped with engine immobilizer system. See appropriate wiring diagram in WIRING DIAGRAMS article. When EFI main relay is energized, the EFI main relay provides battery voltage to circuit opening relay, data link connector No. 1 and various other electrical components. The EFI main relay also provides battery voltage to +B terminal of ECM. See EFI MAIN RELAY LOCATION  table.