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Home › Nissan-Datsun › 2012 › Quest SL › Repair and Diagnosis › Engine Performance › System › Engine Control System - DTCS U0101 To P0159 › DTC P0139, P0159: Ho2S2 › Component Inspection

Component Inspection

  1. INSPECTION START

    Will CONSULT be used?

    Will CONSULT be used? 

    YES: GO TO 2.

    NO: GO TO  3.

  2. CHECK HEATED OXYGEN SENSOR 2

    With CONSULT 

    1. Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT.
    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.
    7. Check "HO2S2 (B1)/(B2)" at idle speed when adjusting "FUEL INJECTION" to ± 25%.
      Fig 1: Identifying Heated Oxygen Sensor 2 Voltage Graph
      G08171515Courtesy of NISSAN NORTH AMERICA, INC.

      "HO2S2 (B1)/(B2)" should be above 0.68 V at least once when the "FUEL INJECTION" is + 25%. 

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

      Is the inspection result normal? 

      YES: INSPECTION END

      NO: Replace malfunctioning heated oxygen sensor 2. Refer to "EXPLODED VIEW ".

  3. CHECK HEATED OXYGEN SENSOR 2-I

    Without CONSULT 

    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 terminals under the following conditions.
      ECM Condition Voltage
      Connector + -
      Terminal Terminal
      F8 57 [HO2S2 (bank 1) signal] 59 (Sensor ground) Revving up to 4, 000 rpm under no load at least 10 times The voltage should be above 0.68 V at least once during this procedure. The voltage should be below 0.18 V at least once during this procedure.
      58 [HO2S2 (bank 2) signal]

      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 terminals under the following conditions.

    ECM Condition Voltage
    Connector + -
    Terminal Terminal
    F8 57 [HO2S2 (bank 1) signal] 59 (Sensor ground) Keeping engine at idle for 10 minutes The voltage should be above 0.68 V at least once during this procedure. The voltage should be below 0.18 V at least once during this procedure.
    58 [HO2S2 (bank 2) signal]

    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 terminals under the following conditions.

    ECM Condition Voltage
    Connector + -
    Terminal Terminal
    F8 57 [HO2S2 (bank 1) signal] 59 (Sensor ground) Coasting from 80 km/h (50 MPH) with selector lever in the D position The voltage should be above 0.68 V at least once during this procedure. The voltage should be below 0.18 V at least once during this procedure.
    58 [HO2S2 (bank 2) signal]

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Replace malfunctioning heated oxygen sensor 2. Refer to "EXPLODED VIEW ".

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