Toyota Matrix ECM Power Source Circuit. When the ignition switch is turned ON, battery positive voltage is applied to the coil which closes the contacts of the E.F.I. relay (Marking: E.F.I.) and supplies power to the terminal +B of the ECM. The 2003 Toyota Matrix ECM Power Source Circuit consists of: instrument panel junction block, ignition switch, EFI relay, battery and ECM. Below schematic shows the Toyota Matrix ECM Power Source Circuit and .

Toyota Matrix ECM Power Source Circuit Wiring Diagram



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