EFI Main Relay

The EFI fuse supplies constant battery voltage to EFI main relay. EFI main relay provides battery voltage to circuit opening relay (some models), data link connector and various other electrical components. Depending on model, EFI main relay may either be turned on directly by ignition switch or by M-REL terminal of Engine Control Module (ECM). The EFI main relay may also provide battery voltage to +B and +B1 terminals of ECM when ignition is turned on. The EFI main relay is located in compartment relay box.