With GST

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

Start engine and warm it up to normal operating temperature.
Set voltmeter probes between ECM terminal 114 [HO2S1 (B1) signal] or 115 [HO2S1 (B2) signal] and ground.
Check the following with engine speed held at 2,000 RPM constant under no load.
- The voltage does not remain in the range of 0.2 to 0.4V.
If NG, go to DIAGNOSTIC PROCEDURE .

Fig 1: Checking Voltage Between ECM Terminals & Ground

Courtesy of NISSAN MOTOR CO., U.S.A.