After troubleshooting, and removing/installing of the electronically controlled 4WD system components, check the diagnosis code using M.U.T.-III. If a diagnosis code is set, erase it and check again that no diagnosis code is set.
Before performing a troubleshooting, check that all four wheels and tyres are same in size, in type, and in brand. The electronically controlled 4WD system will function correctly only when all four wheels and tyres are same in size, and tyre pressure is specified value.
If any abnormality occurs in the electronically controlled 4WD system, "4WD-E" and "LOCK" indicators in the combination meter will illuminate or a message will be displayed to warn the driver.
When the vehicle is used under some severe operational conditions (such as a long-time driving in 4WD on a sandy road, slushy road or road with deep snows or towing or long uphill driving), the electronically controlled 4WD system will illuminate "4WD-E" and "LOCK" indicators or display a message to warn the driver.
The electronically controlled 4WD system is equipped with the fail-safe function which prohibits 4WD control and shifts to 2WD control if any abnormality occurs in the system. If there is a risk that the vehicle behaviour suddenly changes, the gradual shifting to 2WD control is chosen.