Coupling Unit And Control Module (Differential Electronic Module)

Fig 1: Identifying Coupling Unit And Control Module Components

Courtesy of VOLVO CARS OF NORTH AMERICA.

The hydraulic component consists of 1-5, the mechanical component consists of 6-10 and the electronic component consists of 11-14.

1. Pressure valves
2. Accumulator
3. Oil filter
4. Annular pistons
5. Control valves
6. Input shaft
7. Inner and outer wet plates
8. Sinusoidal cam disc
9. Rollers with annular pistons
10. Output shaft
11. Electric oil pump
12. Stepper motor for the control valve
13. Temperature sensor
14. Control module for all wheel drive (differential electronic module)

The differential electronic module is integrated with the coupling unit.

The differential electronic module communicates with other control modules via CAN.

The control module has no internal diagnostics.