Overall Function Check

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

With GST 

1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes between ECM terminal 35 [HO2S1 (B1) signal] and ground.
   Fig 1: Setting Voltmeter Probes Between ECM Terminal 35 [HO2S1 (B1) Signal] And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check the following with engine speed held at 2, 000 rpm constant under no load.
   • The voltage does not remain in the range of 0.2 to 0.4V.
4. If NG, go to "DIAGNOSTIC PROCEDURE ".