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 50 [HOS1 (B1) signal] or 51 [HOS1 (B2) 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 

4. If NG, go to , "DIAGNOSTIC PROCEDURE ".
   Fig 1: Checking Voltage Between ECM Terminal 50 Or 51 And Engine Ground

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