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Home >> Infiniti >> 2008 >> G35 Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS P0137 Through P0430 >> DTC P0139, P0159: Ho2S2 >> Component Inspection
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Component Inspection

  1. INSPECTION START

    Do you have CONSULT-III?

    Do you have CONSULT-III? 

    YES: GO TO 2.

    NO: GO TO  3.

  2. CHECK HEATED OXYGEN SENSOR 2

    With CONSULT-III 

    1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-III.
    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-III.
    7. Check "HO2S2 (B1)/(B2)" at idle speed when adjusting "FUEL INJECTION" to ±25%.
      Fig 1: Voltage Graph
      G04875069Courtesy of NISSAN MOTOR CO., U.S.A.

      "HO2S2 (B1)/(B2)" should be above 0.68V 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%. 

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: GO TO  6.

  3. CHECK HEATED OXYGEN SENSOR 2-I

    Without CONSULT-III 

    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. Check the voltage between ECM harness connector and ground under the following condition.
      VOLTAGE SPECIFICATION

      ECM Ground Condition Voltage
      Connector Terminal
      F102 76 [HO2S2 (bank 1)] Ground Revving up to 4, 000 rpm under no load at least 10 times The voltage should be above 0.68V at least once during this procedure.
      The voltage should be below 0.18V at least once during this procedure.
      80 [HO2S2 (bank 2)]

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: GO TO 4.

  4. CHECK HEATED OXYGEN SENSOR 2-II

    Check the voltage between ECM harness connector and ground under the following condition.

    VOLTAGE SPECIFICATION

    ECM Ground Condition Voltage
    Connector Terminal
    F102 76 [HO2S2 (bank 1)] Ground Keeping engine at idle for 10 minutes The voltage should be above 0.68V at least once during this procedure.
    The voltage should be below 0.18V at least once during this procedure.
    80 [HO2S2 (bank 2)]

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: GO TO 5.

  5. CHECK HEATED OXYGEN SENSOR 2-III

    Check the voltage between ECM harness connector and ground under the following condition.

    VOLTAGE SPECIFICATION

    ECM Ground Condition Voltage
    Connector Terminal
    F102 76 [HO2S2 (bank 1)] Ground Coasting from 80 km/h (50 MPH) in D position (A/T), 4th gear position (M/T) The voltage should be above 0.68V at least once during this procedure.
    The voltage should be below 0.18V at least once during this procedure.
    80 [HO2S2 (bank 2)]

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: GO TO 6.

  6. REPLACE HEATED OXYGEN SENSOR 2

    Replace malfunctioning 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.

    INSPECTION END

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