ECM Power Source Circuit: Description
WARNING: This page is about a different variant/trim than selected.
When the ignition switch is turned to ON, the battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes a current to flow to the EFI MAIN relay coil, closing the EFI relay contacts and supplying power to terminal +B of the ECM.