Precautions For Differential Case Assembly and Differential Lock Control Unit Replacement

Precautions for Differential Case Assembly and Differential Lock Control Unit Replacement.
^ When replacing differential case assembly or differential lock control unit, check the DIFF LOCK indicator pattern and adjustment of the position between differential case assembly and differential lock control unit if necessary.

CHECK DIFF LOCK INDICATOR LAMP
1. Start engine. Run engine for at least 10 seconds.
2. Turn 4WD shift switch to "4LO" and confirm 4LO indicator lamp is turned on. Refer to TF-16, "4WD SHIFT SWITCH AND INDICATOR LAMP".
3. Stop vehicle and turn differential lock mode switch to "ON".
4. Drive vehicle at 7 km/h (4 MPH) or less.

NOTE: Differential case assembly must be given a rotation from rear left wheel and rear right wheel.

5. Check if DIFF LOCK indicator lamp flashes to turn on.
6. Check if DIFF LOCK indicator lamp and 4LO indicator lamp are changed properly as follows.





^ If each indication and state is OK, rear final drive assembly and differential lock control unit is working correctly.
^ If each indication and state is NG, rear final drive assembly and differential lock control unit is not working correctly.

METHOD FOR ADJUSTMENT
1. Perform erase self-diagnosis with differential lock control unit. Refer to RFD-89, "How to Erase Self-diagnostic Results". Clearing Trouble Codes
2. Check differential lock control unit input/output signal. Refer to RFD-85, "Differential Lock Control Unit Input/Output Signal Reference Values". Differential Lock Control Unit Input/Output Signal Reference Values
3. Check DIFF LOCK indicator lamp. Refer to RFD-79, "DIFF LOCK INDICATOR LAMP". System Description
^ If DIFF LOCK indicator lamp is not proper according to the above patterns.
Install new differential lock control unit or check for mechanical malfunction of rear final drive assembly and retry the above (DIFF LOCK indicator lamp) check.
(If differential lock control unit or rear final drive assembly is replaced from another vehicle, the new differential control unit must be replaced first.)