ECM Power Source Circuit: Description
WARNING: This page is about a different variant/trim than selected.
When the ignition switch is turned to the ON, battery voltage is applied to IGSW of the ECM. The output signal from the MREL terminal of the ECM causes a current to flow to the coil, closing the contacts of the integration relay (EFI MAIN relay) and supplying power to either terminal +B and +B2 of the ECM.