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 [Heated oxygen sensor 1 signal] and engine ground.
3. Check the following with engine speed held at 2,000 RPM constant under no load.
   • The voltage does not remain in the range of 0.2 to 0.4V.
4. If NG, go to DIAGNOSTIC PROCEDURE .

Fig 1: Setting Voltmeter Probes Between ECM Terminal And Engine Ground

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