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The controller manager is probably not running.
pr2_controller_manager
is just a library that provides a few services and the infra structure for running controller plugins in a loop. Gazebo or the real hardware (package pr2_etherCAT) link against that library and provide the interface between the controllers and the hardware.
If you just want to play around with pr2_controller_manager, run the PR2 in simulation with:
roslaunch pr2_gazebo pr2_empty_world.launch