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Home >> Toyota >> 2016 >> Corolla S, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 23 (Engine Control System (2ZR-FAE) - Diagnostic Codes (8 Of 8) & Symptom Tests (Model Code: ZRE172)) >> SFI System >> Circuit Tests >> ECM Power Source Circuit [08/2013 - ] >> Description

ECM Power Source Circuit [08/2013 - ]: 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 terminal is +B and +B2 of the ECM.

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