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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 117 (Engine Control System (A25A-FXS) - Diagnostic Codes (20 Of 20) & Circuit Tests (1 Of 2)) >> SFI System >> ECM Power Source Circuit [06/2018 - ] >> Description

ECM Power Source Circuit [06/2018 - ]: Description

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When the power switch is turned to on (IG), the auxiliary battery voltage is applied to IGSW of the ECM. When the transistor in the MREL circuit operates, current flows from the auxiliary battery to ground through the drive circuit of the EFI-MAIN NO. 1 relay, thus operating the relay which supplies power to the +B and +B2 terminals of the ECM.

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