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Component
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Function
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Switch of the four-wheel drive
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When the lever of gear shifting is switched to situation 4L or 4H, this switch turns on and forces to turn on the control system of the four-wheel drive if not to switch the lever to situation N or 2N within 1 second.
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Electronic control unit
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When the switch of the four-wheel drive turns on (if not to switch off it within 1 second), this component starts operation of the pump. If pressure in the air pump does not rise above the established level even after 10 seconds of operation of the pump, this component stops the motor to protect it.
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Air pump
* Pump motor
* Will protect. valve
* Pressure switch
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The air pump consists of the motor of the pump, safety (the perepuskny valve) and pressure switch.
Pump motor: forms the positive pressure which turns on the actuator.
Safety valve: It is closed when the lever of gear shifting switches in situation 4H or 4L so positive pressure arrives to the actuator, and opens when the provision of a N or 2N broadcast to release pressure in the atmosphere.
Pressure switch: it joins and switched off depending on pressure level in the pump (above or below the established level). The electronic control unit determines pressure level by this switch.
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Differential case
* Free plug of an axis
* Coupling of blocking of an axis
* Actuator
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The free plug of an axis, the coupling of blocking of an axis and the actuator are installed in the left case of differential. The positive pressure created in the air pump moves on the actuator which pushes the coupling of blocking of an axis in gearing with the free plug of an axis. In this state force of the drive is transferred to a forward axis that creates the mode of the four-wheel drive.
When in the actuator there is no positive pressure (when it with an atmospheric pressure), the coupling of blocking of an axis is pushed with force of a returnable spring back and cannot enter gearing with the free plug of an axis that creates the drive mode on two wheels.
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Bulb of the indicator of the four-wheel drive
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It lights up when the control system of the four-wheel drive is in the mode of the four-wheel drive.
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