Camry V6-3.5L (2GR-FE) (2008)
Engine Control Module: Component Tests and General Diagnostics
2GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: ECM Power Source Circuit
ECM Power Source Circuit
DESCRIPTION
When the ignition switch is turned on (IG), 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 MAIN relay and supplying power to terminal +B of the ECM.
If the ignition switch is turned off, the ECM holds the EFI MAIN relay ON for a maximum of 2 seconds to allow for the initial setting of the throttle
valve.
When the ignition switch is turned on (IG), voltage from the ECM's MREL terminal applies to the engine room junction block (EFI relay). This causes
the contacts of the engine room junction block (EFI relay) to close, which supplies power to terminal +B or +B1 of the ECM.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
(a) Disconnect the C55 ECM connector.