Coupling Unit And Control Module (Differential Electronic Module)

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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.

Pressure valves
Accumulator
Oil filter
Annular pistons
Control valves
Input shaft
Inner and outer wet plates
Sinusoidal cam disc
Rollers with annular pistons
Output shaft
Electric oil pump
Stepper motor for the control valve
Temperature sensor
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.