Toyota 4 Runner/Hilux/Surf

1987-1998 of release

Repair and operation of the car



Toyota 4ranner
+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engines
+ 4. Systems of heating, ventilation
+ 5. Fuel and exhaust systems
+ 6. Transmissions
- 7. Transmission elements
   7.1. Specifications
   + 7.2. Coupling
   + 7.3. Cardan shaft and cardan hinges
   7.4. Back and forward axes
   7.5. Bearing, epiploon and half shaft of the back bridge
   7.6. Epiploon of a reducer of the back bridge and forward axis
   7.7. Zadny Bridge
   7.8. Forward half shafts
   7.9. Replacement of covers and dismantling of the CV JOINT
   - 7.10. Electromagnetic drive of a forward leading axis (ADD system)
      7.10.1. Drive
      7.10.2. Block of solenoids
      7.10.3. Relay
      7.10.4. Drive switch
      7.10.5. Switch of the selector of a forward axis
   7.11. Forward reducer
+ 8. Brake system
+ 9. Suspension bracket and steering
+ 10. Body
+ 11. Electric equipment
+ 12. Electrical circuitries



7.10. Electromagnetic drive of a forward leading axis (ADD system)

GENERAL INFORMATION

Knots of the electromagnetic drive of a forward leading axis

1. Control lamp
2. The processor block (on the car with the selector of a forward axis)
3. The switch (on the car with the selector of a forward axis)
4. Block of solenoids of the electromagnetic drive
5. Vacuum tank
  6. Drive switch
7. Drive
8. The selector switch (on the car without selector of a forward axis)
9. Relay
10. The switch of a forward axis (on the car with the selector of a forward axis)

The all-wheel drive cars "Toyotas 4 Runner/Hilux/Surf" are equipped with the electromagnetic drive of a forward leading axis (ADD system).

At inclusion of a forward axis the drive blocks the left half shaft through which the torque from the engine is transmitted.

When using blocking of a half shaft need for the blocked naves is excluded, however loads of CV JOINTS, covers and details of differential which rotate even at the disconnected axis lobby increase, and their wear amplifies.

On cars with such system of a half shaft and covers demand especially attentive check.

At abnormal inclusion and switching off of a forward axis it is necessary to execute the checks considered below.

If the taken measures do not yield result, then the car should be handed over in car service.


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