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Home >> Toyota >> 2024 >> Corolla LE >> Repair and Diagnosis >> External Pages >> Different car >> Section 259 (Engine Control System (2ZR-FAE) - Diagnostic Codes (8 Of 8), Circuit Tests & Symptom Tests (1 Of 2)) >> SFI System >> ECM Power Source Circuit [09/2022 - 11/2022] >> Description

ECM Power Source Circuit [09/2022 - 11/2022]: Description

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

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