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With GST

Start engine and warm it up to normal operating temperature.
Set voltmeter probes between ECM terminal 35 [HO2S1 (B1) signal] and engine ground.
Check one of the following with engine speed held at 2, 000 RPM constant under no load.
- The maximum voltage is below 0.8V at least 1 time.
- The minimum voltage is below 0.35V at least 1 time.
If NG, go to "DIAGNOSTIC PROCEDURE "

Fig 1: Setting Voltmeter Probes Between ECM Terminal 35 & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.