With GST

WARNING: This page is about a different car, the 2004 Infiniti Q45. 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 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 .