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] or 16 [HO2S1(B2) 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. 1 time: 0 - 0.3V --> 0.6 - 1.0V --> 0 - 0.3V 
   2. 2 0 - 0.3V --> 0.6 - 1.0V --> 0 - 0.3V --> 0.6 - 1.0V times: --> 0.03V 
4. If NG, go to "Diagnostic Procedure ".
   Fig 1: Overall Function Check With GST

   Courtesy of NISSAN MOTOR CO., U.S.A.