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Home >> Toyota >> 2018 >> Camry LE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 21 (Engine Control System (2GR-FKS) - Circuit Tests (2 Of 2) & Symptom Tests (1 Of 2) (Except Hybrid)) >> SFI System >> ECM Power Source Circuit [06/2017 - ] >> Description

ECM Power Source Circuit [06/2017 - ]: Description

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When the engine switch is turned on (IG), the battery voltage is applied to the IGSW terminal of the ECM.

The output signal from the MREL terminal of the ECM causes a current to flow to the coil of the EFI-MAIN NO. 1 relay, closing the contacts and supplying power to terminals +B and +B2 of the ECM.

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