Suzuki Grand Vitara SQ416/SQ420/420WD

since 1998 release

Repair and operation of the car



Suzuki Grand Vitara
+ General information
+ Maintenance and lubricant
+ 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
+ System of ignition
+ System of start
+ System of release
+ Transmissions
+ Coupling
+ Transfer
- Forward and back differentials
   - Forward diffrentsiat
      - General description
         - Control system of the four-wheel drive
            Functioning and electrical circuitry of system
            Components and functions
      + Diagnostics
      + Service out of a workshop
   + Back differential
+ Windows, mirrors, locks and security measures. Immobilizer
+ Electric equipment


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Control system of the four-wheel drive

When the switch of the four-wheel drive is switched on by switching of the lever of gear shifting, the electronic control unit (ECM/PCM) (at models with G16 and J20 engines) or the controller of the four-wheel drive puts in action (activates) the air pump. Then positive pressure comes from the air pump to the actuator installed on the differential case and forces the coupling of blocking of an axis to contact to the free plug of an axis in the differential case that creates the mode of the four-wheel drive. Only at the movement in the mode of the four-wheel drive forward axes join the differential case, and are released when the drive on two wheels is used (or when the lever of gear shifting is switched to situation N), reducing thereby loss of power.

1 — the switch of the four-wheel drive
2 — transfer
3 — preparation
4 — preparation
5 — an electronic control unit
6 — a box for trifles

7 — the air pump
8 — the actuator
9 — the coupling of blocking of an axis
10 — the free plug of an axis
11 — a bulb of the indicator of the four-wheel drive