ECM Power Source Circuit [09/2022 - ]: Description
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When the power switch is turned on (IG), auxiliary battery voltage is applied to the IGP terminal 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.