Titan is a service module. Titan module provides the orientation (including gravitational, by tidal forces) and also
the transorbital maneuvers.
Lift off with Energia-Buran-T-DM2. Maneuvers on rendezvous with passive Mir-2 core are provided with DM-2.
At the final approach and docking the Titan module is using its own engines. Titan approachs to the 2-nd (tail) docking port of Mir-2