1. When the rear wheels are punctating, the front wheels stop paddle, an error is periodically made to warn of the need for diagnosis, rear wheels are connected with impact. There may be more than one reason. The full actuator pump may not have been broken, the gearbox is broken, the oil in the muff and the back gear has not been changed for a long time (the manufacturer asserts that the oil is full for the life of the service, but it is better to change it 50 000 km). and in the rear and in the front axle).
2. A full drive may also fail to operate due to a non-startable or missing DEM module (the electronic differential plug-in). It controls the functions of the drive and distributes the moment between the wheels. It is a complex node consisting of mechanical, hydraulic and electronic parts. It has two bolts in the back bridge area. The module may not be present because they are often stolen. 50,000 rubles ($1,500 to $1,450); and organization, up to 1 million rubles It's very simple to remove it, so it's so popular with intruders. Many are trying to protect it from theft of the complicated process of dismantling (for example, it is pluing the edge of the bolts). The node cannot be repaired while the failure is in the process.
3. Dating and reintroducing modifications that were originally intended for the US market. To find out such a machine is possible in the absence of a shaft.