Corolla L4-1.8L (2ZZ-GE) (2005)
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Engine Control Module: Component Tests and General Diagnostics
ECM POWER SOURCE CIRCUIT
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.
Wiring Diagram
