WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
For circuit terminal identification, see Fig 1-Fig 3
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Fig 1: Circuit Testing Value Chart For DTC P0031 Or DTC P0032: HO2S1 Heater (2.5L)
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Circuit Testing Value Chart For DTC P0031, DTC P0032, DTC P0051 Or DTC P0052: HO2S1 Heater (Bank 1 - 3.5L)
Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 3: Circuit Testing Value Chart For, DTC P0031, DTC P0032, DTC P0051 Or DTC P0052: HO2S1 Heater (Bank 2 - 3.5L)