With CONSULT-II

1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-II.
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.
   Fig 1: CONSULT-II Display - DATA MONITOR

   Courtesy of NISSAN NORTH AMERICA, INC.
6. Select "FUEL INJECTION" in "ACTIVE TEST" mode, and select "HO2S2 (B1)/(B2)" as the monitor item with CONSULT-II.
   Fig 2: CONSULT-II Display "ACTIVE TEST"

   Courtesy of NISSAN NORTH AMERICA, INC.
7. Check "HO2S2 (B1)/(B2)" at idle speed when adjusting "FUEL INJECTION" to ±25%.
   Fig 3: HO2S2 (B1) Voltage Graph

   Courtesy of NISSAN NORTH AMERICA, INC.

   "HO2S2 (B1)/(B2)" should be above 0.58V at least once when the "FUEL INJECTION" is +25%. 

   "HO2S2 (B1)/(B2)" should be below 0.18V at least once when the "FUEL INJECTION" is -25%. 

   CAUTION:

   • Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
   • Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

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 55 [HO2S2 (B2) signal] or 74 [HO2S2 (B1) signal] and ground.
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 0.58V at least once during this procedure. 

   If the voltage is above 0.58V 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.

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

   Fig 4: Checking Voltage Between ECM Connector 74 And Ground

   Courtesy of NISSAN NORTH AMERICA, INC.
8. If NG, replace heated oxygen sensor 2.
   CAUTION:

   • Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
   • Before installing new oxygen sensor, clean exhaust system threads (using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12) and approved anti-seize lubricant.