Sequoia 4WD V8-4.7L (2UZ-FE) (2006)
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3. REMOVE HEATER TO REGISTER DUCT
4. REMOVE ECM
a. Disconnect the 5 connectors.
b. Remove the 2 bolts and ECM.
5. INSPECT ECM
Refer to Control Module Pinout Values. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Pinout Values and
Diagnostic Parameters
6. REINSTALL ECM
a. Install the ECM with the 2 bolts.
b. Connect the 5 connectors.
7. INSTALL HEATER TO REGISTER DUCT
8. INSTALL GLOVE COMPARTMENT
a. Install the lower No.2 finish panel with 3 screws.
b. Install the glove compartment door with the 2 screws.
9. CONNECT CABLE TO NEGATIVE (-) BATTERY TERMINAL
10. PERFORM INITIALIZATION
a. Perform initialization.
HINT: Some system need initialization when disconnecting the cable from the battery terminal.
ECM Power Source Circuit
ECM Power Source Circuit
DESCRIPTION
When the ignition switch is turned ON, the positive battery voltage is applied to terminal IGSW of the ECM and the EFI relay control circuit in the ECM
sends a signal to terminal MREL of the ECM switching on the EFI relay.
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 for a maximum of 2 seconds to allow for the initial setting of the throttle valve.
