With GST

Start engine and warm it up to the normal operating temperature.
Turn ignition switch OFF and wait at least 10 seconds.
Start engine and keep the engine speed between 3, 500 and 4, 000 RPM for at least 1 minute under no load.
Let engine idle for 1minute.
Open engine hood.
Set voltmeters probes between ECM terminal 76 [HO2S2 (bank 1) signal], 80 [HO2S2 (bank 2) signal] and ground.
Keep engine speed at 2, 500 RPM constant under no load.
Make sure that the voltage does not vary for more than 5 seconds. It the voltage fluctuation cycle take less than 5 seconds. Go to "DIAGNOSIS PROCEDURE ".
- 1 cycle: 0.6 - 1.0 → 0 - 0.3 → 0.6 - 1.0
  
  Fig 1: Setting Voltmeters Probes Between ECM Terminal 76 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.