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Home >> Toyota >> 2021 >> Corolla LE >> Repair and Diagnosis >> External Pages >> Different car >> Section 73 (Engine Control System (2ZR-FE) - Diagnostics - Circuit Tests (Model Code: ZRE172)) >> SFI System >> Circuit Tests >> ECM Power Source Circuit [08/2013 - ] >> Description
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ECM Power Source Circuit [08/2013 - ]: Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2019 Toyota Corolla, 2018 Toyota Corolla, 2017 Toyota Corolla, 2016 Toyota Corolla, and 2015 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

When the ignition switch is turned to ON, the battery voltage is applied to IGSW terminal 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 terminals +B and +B2 of the ECM.

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