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Home >> Toyota >> 2004 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Control System (SFI) - Diagnostics (2ZZ-GE)) >> ECM Power Source Circuit >> Circuit Description
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Circuit Description

WARNING: This page is about a different variant/trim than selected.

When the ignition switch is turned ON, the battery positive voltage is applied to the coil which closes the contacts of the EFI relay (Marked: EFI) and supplies power to terminal +B of the ECM.

This signal causes current to flow to the coil, closing the contacts of the EFI relay and supplying power to terminal +B of the ECM.

If the ignition switch is turned off, the ECM continues to switch on the EFI relay for a maximum of 2 seconds for the initial setting of the ISC valve.

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