CHECK OF ELECTRONIC CONTROL COUPLING



SIMPLE OPERATION CHECK OF ELECTRONIC CONTROL COUPLING


caution The following checks in the 4WD mode must be completed within one minute in total to protect the 4WD drive system components and parking brake.
1.Raise the vehicle.

2.Mark the front and rear tyres for easy identification of tyre rotation.
3.Adjust the parking brake lever to the normal conditions. (Refer to GROUP 36 - On-vehicle Service, Parking Brake Lever Stroke Check and Adjustment ).
4.Pull the parking brake lever by two notches. Then start the engine.
note Activating the parking brake slightly prevents the drive force transferring to the rear wheels by a friction in the electronic control coupling. If the following 2WD mode is checked without the parking brake activation, the drive force is transferred to the rear wheels by a friction in the electronic control coupling.
5.Execute the special test (item No. 4: control off) (Refer to ) to switch the drive mode into 2WD forcibly.
6.Move the shift lever into the selector lever into D position.
7.Depress the accelerator pedal gradually, and maintain the vehicle speed at approximately 10 km/h. (Make sure that the rear wheels do not rotate).
8.Stop the engine.
9.Start the engine again, and move the shift lever into the selector lever into D position.
10.Switch the 4WD switch to "4WD AUTO" position, and check that the rear wheels are rotating.
11.Depress the accelerator pedal gradually, and maintain the vehicle speed at approximately 10 km/h.
After the above checks are completed, if the rear wheel rotation satisfies the above conditions, it is judged that the electronic control coupling operates correctly. If the rear wheel rotation does not satisfy the above conditions, replace the electronic control coupling. (Refer to .)

RESISTANCE MEASUREMENT BETWEEN ELECTRONIC CONTROL COUPLING SOLENOID CONNECTOR TERMINALS




Disconnect the electronic control coupling solenoid connector, and measure the resistance value between the connector terminals on the unit side. If the measured resistance value is out of the standard value range, replace the electronic control coupling. (Refer to .)
Standard value: 2.2 - 4.0 Ω