With GST

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 fluctuates between 0 to 0.3V and 0.6 to 1.0V more than 5 times within 10 seconds.
  1. 1 time: 0 - 0.3V to 0.6 - 1.0V to 0 - 0.3V
  2. 2 times: 0 - 0.3V to 0.6 -1.0V to 0 - 0.3V to 0.6 - 1.0V to 0 - 0.3V
Fig 1: Checking Voltages between ECM terminal 114 or 115 & ground
Courtesy of NISSAN MOTOR CO., U.S.A.
If NG, go to DIAGNOSTIC PROCEDURE .