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TCM Diagnostic Functions: Overview
WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2014 Volvo XC90, 2013 Volvo XC90, 2012 Volvo XC90, 2011 Volvo XC90, and 2010 Volvo XC90. However, it is still accessible from the selected car via links, so may be relevant.
Courtesy of VOLVO CARS CORPORATION
The control unit has built-in diagnostics, Volvo Diagnostics, which continually monitor the system and the input and output signals.