Tacoma 4WD L4-2.7L (3RZ-FE) (2004)
Engine Control Module: Component Tests and General Diagnostics
ECM Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned to ON, positive battery voltage is applied to the coil, closing the contacts of the EFI main relay (Marked: EFI) and
supplying power to terminal +B of the ECM.
Wiring Diagram