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Home >> Toyota >> 2005 >> Matrix Base, 4WD >> Repair and Diagnosis (Single Page) >> Engine Performance >> Engine Control System (SFI) (1ZZ-FE(4WD)) - Diagnostics >> SFI System (1ZZ-FE (4WD)) >> ECM Power Source Circuit >> Circuit Description

Circuit Description

When the ignition switch is turned to ON, the battery voltage is applied to terminal IGSW of the ECM. The ECM MREL output signal causes a current to flow to the coil, closing the contacts of the EFI relay and supplying power to terminal +B of the ECM.

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