Tundra 4WD V8-4.6L (1UR-FE) (2010)
Engine Control Module: Component Tests and General Diagnostics
1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: ECM Power Source Circuit
- ECM Power Source Circuit
DESCRIPTION
When the ignition switch is turned to ON, the battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of
the ECM causes a current to flow to the coil, closing the contacts of the integration relay (EFI relay) and supplying power to terminals +B and +B2 of the
ECM.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. INSPECT FUSES (AM2, IG2 MAIN, EFI NO. 1, IGN)