Heated Oxygen Sensor 2

With CONSULT-II 

1. Turn ignition switch ON and select DATA MONITOR mode with CONSULT-II. See Figure.
2. Start engine and warm it up to the normal operating temperature.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and keep the engine speed between 3,500 and 4,000 RPM for at least 1 minute under no load.
5. Let engine idle for 1 minute.
6. Select FUEL INJECTION in ACTIVE TEST mode, and select HO2S2 (B1)/(B2) as the monitor item with CONSULT-II.
   Fig 1: Displaying Fuel Injection Active Test (CONSULT-II)

   Courtesy of NISSAN MOTOR CO., U.S.A.
7. Check HO2S2 (B1)/(B2) at idle speed when adjusting FUEL INJECTION to +/-25%.
   Fig 2: Graphing Heated Oxygen Sensor 2 Voltage During Fuel Injection Adjustment At Ideal Speed

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

Without CONSULT-II 

1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3,500 and 4,000 RPM for at least 1 minute under no load.
4. Let engine idle for 1 minute.
5. Set voltmeter probes between ECM terminal 74 [HO2S2 (B1) signal] or 55 [HO2S2 (B2) signal] and body ground.
   Fig 3: Testing Heated Oxygen Sensor 2 Operation

   Courtesy of NISSAN MOTOR CO., U.S.A.
6. Check the voltage when revving up to 4,000 RPM under no load at least 10 times.

   Depress and release accelerator pedal as soon as possible.

   The voltage should be above 0.78V at least once during this procedure  .

   If the voltage is above 0.78V at step 6, step 7 is not necessary  .

7. Keep vehicle at idling for 10 minutes, then check voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in D position with OD off.

   The voltage should be below 0.18V at least once during this procedure  .

8. If NG, replace heated oxygen sensor 2.