Real Time AWD System Symptom Troubleshooting - Will not go into 4WD mode, Poor traction, Poor acceleration (at start), Poor climbing ability (AWD)

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Will not go into 4WD mode, Poor traction, Poor acceleration (at start), Poor climbing ability

Rear differential clutch check
-1. Do the rear differential clutch test .

Is the test result OK?
1. YES
  
  Check the following items.
  - Check the rear differential fluid level and the fluid condition .
  - Check for rear differential fluid leaks.
  - Do the OIL PRESSURE CONTROL TEST in the FUNCTIONAL TEST with the HDS .
  - Do the rear differential fluid pressure sensor test .
  NO
  
  Do the repair depending on the test result .