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 the following with engine speed held at 2, 000 RPM constant under no load.
- The voltage fluctuates between 0 to 0.3V and 0.6 to 1.0V more than 5 times within 10 seconds.
  1 time: 0 - 0.3V --> 0.6 - 1.0V --> 0 - 0.3V
  
  2 times: 0 - 0.3V --> 0.6 - 1.0V --> 0 - 0.3V --> 0.6 - 1.0V --> 0 - 0.3V
Fig 1: Checking Voltage Between ECM Terminal 35 & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
If NG, go to "DIAGNOSTIC PROCEDURE ".