Overall Function Check

WARNING: This page is about a different car, the 2004 Nissan Frontier. However, it is still accessible from the selected car via links, so may be relevant.

Use this procedure to check the overall function of the heated oxygen sensor 1 circuit. During this check, a DTC might not be confirmed.

WITH GST

Start engine and warm it up to normal operating temperature.
Set voltmeter probes between ECM terminal 50 [HOS1 (B1) signal] or 51 [HOS1 (B2) 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. 1 time: 0 - 0.3V -->0.6 - 1.0V -->0 - 0.3V
  2. 2 times: 0 - 0.3V -->0.6 - 1.0V -->0 - 0.3V -->0.6 - 1.0V -->0 - 0.3V
If NG, go to "DIAGNOSTIC PROCEDURE ".

Fig 1: Setting Voltmeter Probes Between ECM Terminal 50 [HOS1 (B1) Signal] Or 51 [HOS1 (B2) Signal] And Engine Ground
Courtesy of NISSAN MOTOR CO., U.S.A.