1. Disconnect the negative battery terminal.
2. Disconnect the 4WD solenoid connector.
3. Measure the resistance between terminals A and B of the 4WD solenoid connector. If the measured resistance value is not correct (2.2-2.7 Ohm at 20°C rear final drive oil temperature), replace the coupling.
4. Connect the 4WD solenoid connector.
5. Connect the negative battery terminal.