Peugeot 406

since 1996 release

Repair and operation of the car

Peugeot 406
+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engine
+ 4. Cooling systems, heating and ventilation
+ 5. Fuel system
+ 6. System of ignition
+ 7. Coupling
- 8. Transmissions
   + 8.1. Mechanical transmission
   - 8.2. Automatic transmission
      8.2.1. Technical data
      8.2.2. Replacement of oil in the transmission
      8.2.3. Removal and installation of a cable of the selector
      8.2.4. Removal and installation of the drive of a speedometer
      8.2.5. Removal and installation of a cooler
      8.2.6. Removal and installation of the multipurpose switch
      8.2.7. Removal and installation of the electronic control device (ECU)
      8.2.8. Removal and installation of the automatic transmission
      8.2.9. Capital repairs of the automatic transmission
+ 9. Power shafts
+ 10. Brake system
+ 11. Suspension bracket and steering
+ 12. Body
+ 13. Electric equipment
+ 14. Main malfunctions

8.2. Automatic transmission


Models with the 2.0 liters petrol engines can be equipped with the computer which operates the 4-speed automatic transmission consisting of the hydrotransformer, the tooth gearing and hydraulically the operated coupling and brakes.

The transmission is run by the electronic control device (ECU) which receives the signals relating to the operational modes of the transmission from various sensors. On the basis of these data of ECU can establish optimum speeds of the movement of the car according to a driving manner.

The torque from the engine to the transmission is transmitted through the hydrotransformer which performs function of liquid coupling and operates as automatic coupling, also providing torque transmission at acceleration.

The tooth gearing provides advance on one of 4 transfers or the movement with a backing. Components of the tooth gearing cope brakes and clutch couplings which are put in action hydraulically. The pump located in the transmission provides necessary hydraulic pressure for work of a brake and a clutch coupling.

The control of the transmission is made by the lever of the selector having 7 provisions. Situation "D" provides the automatic choice of transfers from 4 forward transfers. The automatic mechanism of decrease in transfers switches transfer to the lowest if the pedal of an accelerator is pressed against the stop. This mode needs to be used when the maximum acceleration of the car is required. Decrease in transfer is similar to other functions of transfer and ECU copes. If the lever of the selector is in situation "3", the car will move only on the first three transfers, and in situation "2" – only on the first two transfers, etc. Installation of lower transfers is desirable when braking by the engine, at the movement from biases or for prevention of the undesirable choice of the highest transfer on twisting roads.

In addition three programs of the movement operated by the switch to the left of the selector lever provide additional control by the driver of transfer according to road conditions. In situation "Normal" the transmission works in the usual automatic mode. In the Sport mode gear shifting happens at higher turns of the engine. In the Snow mode in position of the lever of the selector "D" the movement of the car begins with the second transfer.

In syaz with complexity of the automatic transmission any repair has to be made at the Peugeot station.