Description and Operation
4WD ECU processes signals from various sensors and determines the current road and driving conditions. The ECU then utilizes this information to implement precision control over the 4WD coupling's multi-plate clutch and variably adjust the amount of torque delivered to the rear wheels.
Power Flow Diagram
4WD ECU Input&Output Diagram
4WD ECU Connector
4WD ECU Circuit Diagram
Components and Components Location
Prior to replacing the 4WD ECU, check the 4WD ECU's clutch learing with the GDS tool. (Refer to "Coupling assembly" in 4WD group)
1. Remove the lower panel. (Refer to "Crash Pad" in BD group)
2. Remove the IPM. (Refer to "Fuses and Relays" in BE group)
3. Remove the parking brake pedal. (Refer to "Parking Brake System" in BR group
4. Remove the 4WD ECU (C) after removing the nut (A-2ea) and the connector (B).
Tightening torque: 9.8 ~ 11.8 N.m (1.0 ~ 1.2 kgf.m, 7.2 ~ 8.7 lb-ft)
5. Installation is the reverse of removal.
Prior to installing a new ECU, upload the original ECU's clutch learing to the replacement ECU using the GDS tool. (Refer to "Coupling assembly" in 4WD group)