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 engine ground.
   Fig 1: Checking Voltage Between ECM Connector Terminal 35 [HO2S1 (B1) Signal] And Engine 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 over 0.6V at least 1 time.
   • The minimum voltage is over 0.1 V at least 1 time.
4. If NG, go to "DIAGNOSTIC PROCEDURE ".