Dephosphorylates Wzc. Required for the extracellular polysaccharide colanic acid synthesis. Probably involved in the export of colanic acid from the cell to medium. Involved in protection of cells against contact-dependent growth inhibition (CDI). H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Glycan metabolism; exopolysaccharide biosynthesis. Belongs to the low molecular weight phosphotyrosine protein phosphatase family.