Overall Function Check

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 

1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes between ECM terminal 91 (HO2S1 bank 1 signal) or 92 (HO2S1 bank 2 signal) and engine 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 Overall Function Of Heated Oxygen Sensor 1

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