Suzuki Grand Vitara SQ416/SQ420/420WD

since 1998 of release

Repair and car operation

Suzuki Grandee of Wetar
+ General information
+ Maintenance and greasing
+ Heater, ventilation and conditioner
+ Steering
+ Suspension bracket
+ Wheels and tires
+ Forward driving shaft/bearing of a shaft. Oil epiploon
+ Driveshafts
+ Brake system
+ Engines
+ Fuel system
+ ignition System
+ start System
+ release System
+ Transmissions
+ Coupling
+ Transfer
- Forward and back differentials
   - Forward диффренциал
      - General description
         - Control system of a full drive
            Functioning and system electroscheme
            Components and functions
      + Diagnostics
      + Service out of a workshop
   + Back differential
+ Windows, mirrors, locks and security measures. Immobilizer
+ Electric equipment


Components and functions



Switch of a full drive

When the lever of gear shifting is switched in situation 4L or 4H, this switch turns on and forces to join the monitoring system of a full drive if the lever not to switch in situation N or 2Н within 1 second.

Electronic control unit

When the switch of a full drive turns on (if it not to switch off 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.

Air pump

pump *motor

*Предохранит. valve

*vyklyuchatel of pressure

The air pump consists of the motor of the pump, safety (the perepuskny valve) and the pressure switch.

Pump motor: forms positive pressure which turns on the actuator.

Safety valve: It is closed, when the lever of gear shifting is switched in situation 4Н or 4L so positive pressure arrives to the actuator, and opens, when the provision of a broadcast N or 2Н to let out 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.

Differential case

*svobodny plug of an axis

*Муфта axis blocking


The free plug of an axis, the coupling of blocking of an axis and the actuator are established 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 condition force of a drive is told to a forward axis that creates a mode of a full drive.

When in the actuator there is no positive pressure (when it at atmospheric pressure), the coupling of blocking of an axis is pushed back with force of a returnable spring and cannot enter gearing with the free plug of an axis that creates a drive mode on two wheels.

Bulb of the indicator of a full drive

It lights up, when the control system of a full drive is in a mode of a full drive.