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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 1430 (Engine Control System) >> DTC P0138, P0158: Ho2S2 >> Component Inspection >> Heated Oxygen Sensor 2 >> Without CONSULT-II

Without CONSULT-II

WARNING: This page is about a different car, the 2005 Nissan 350Z. However, it is still accessible from the selected car via links, so may be relevant.
  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 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 0.78V 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 (A/T), 4th gear position (M/T).
    Fig 1: ECM Terminal 74 [Ho2S2 (B1) Signal Or 55 [Ho2S2 (B2) Signal & Ground Voltage Test
    G02401465Courtesy of NISSAN MOTOR CO., U.S.A.

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

  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.