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: Checking Voltmeter Probes Between ECM Terminal 35 And Ground

   Courtesy of NISSAN MOTOR CO., U.S.A.
3. Check one of the following with engine speed held at 2, 000 rpm constant under no load.
   • The maximum voltage is below 0.8V at least 1 time.
   • The minimum voltage is below 0.35V at least 1 time.
4. If NG, go to "DIAGNOSTIC PROCEDURE ".