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 one of the following with engine speed held at 2, 000 rpm constant under no load.
   • The maximum voltage is over 0.6V at least 1 time.
   • The minimum voltage is over 0.1V at least 1 time.
   Fig 1: Checking Voltmeter Probes Between ECM Terminal 35 And Ground

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