Side clearance
WARNING: This page is about a different car, the 2010 Suzuki Kizashi. However, it is still accessible from the selected car via links, so may be relevant.
Using straightedge (1) and feeler gauge (2), measure side clearance of inner rotor.
If side clearance is out of specification, replace oil pump assembly.
Oil pump side clearance for oil pump inner rotor
Standard: 0.035 - 0.070 mm (0.0014 - 0.0027 in.)