Corolla L4-1.8L (2ZR-FE) (2009)
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Engine Control Module: Component Tests and General Diagnostics
2ZR-FE ENGINE CONTROL: SFI SYSTEM: ECM Power Source Circuit
ECM Power Source Circuit
DESCRIPTION
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.
WIRING DIAGRAM
