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.
3. 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 At ECM Terminal 35 - Engine Speed Held At 2, 000 RPM Constant, Under No Load

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. If NG, go to "DIAGNOSTIC PROCEDURE ".