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ECM Power Source Circuit: Description

WARNING: This page is about a different car, the 2007 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.

When the ignition switch is turned to the ON position, the 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 EFI relay and supplying power to either terminal +B or +B2 of the ECM.

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