RX 330 AWD V6-3.3L (3MZ-FE) (2004)
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Engine Control Module: Component Tests and General Diagnostics
ECM POWER SOURCE CIRCUIT
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery voltage is applied to terminal IGSW of the ECM. The ECM "MREL" output signal energizes the EFI
relay (Marked: EFI).
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 holds the EFI relay ON for a maximum of 2 seconds to allow for the initial setting of the throttle valve.
Wiring Diagram
