Participates in a thiamine pyrimidine salvage pathway as part of the ABC transporter complex ThiXYZ involved in the import of thiamine degradation products such as the formylaminopyrimidine N-formyl-4-amino-5-aminomethyl-2-methylpyrimidine (FAMP). Is likely responsible for energy coupling to the transport system. Cofactor biosynthesis; thiamine diphosphate biosynthesis. The complex is likely composed of an ATP-binding protein (ThiZ), a transmembrane protein (ThiX) and a solute-binding protein (ThiY). Belongs to the ABC transporter superfamily.