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Home >> Infiniti >> 2012 >> M35h >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P014F >> DTC P0138, P0158: Ho2S2 >> DTC Logic >> DTC Confirmation Procedure
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DTC Confirmation Procedure

  1. PRECONDITIONING

    If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Turn ignition switch ON.
    3. Turn ignition switch OFF and wait at least 10 seconds.

      : GO TO 2.

  2. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
    1. Perform "INSPECTION MODE 5". Refer to "DESCRIPTION ".
    2. Start engine and warm it up to the normal operating temperature.
    3. Turn ignition switch OFF and wait at least 10 seconds.
    4. Turn ignition switch ON.
    5. Turn ignition switch OFF and wait at least 10 seconds.
    6. Drive the vehicle at speed of 100 km/h (62 MPH) for at least 1 minutes.
      CAUTION: Always drive vehicle at a safe speed.
    7. Stop the vehicle and set selector lever to P position.
    8. Check 1st trip DTC.

      Is 1st trip DTC detected? 

      YES: Go to "DIAGNOSIS PROCEDURE ".

      NO-1: With CONSULT: GO TO 3.

      NO-2: Without CONSULT: GO TO  5.

  3. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B
    NOTE: For better results, perform "DTC WORK SUPPORT" at a temperature of 0 to 30 °C (32 to 86 °F).
    1. Perform "INSPECTION MODE 5". Refer to "DESCRIPTION ".
    2. Start engine.
    3. Select "DATA MONITOR" mode of "ENGINE" with CONSULT.
    4. Warm engine up to the normal operating temperature.
    5. Turn ignition switch OFF and wait at least 10 seconds.
    6. Turn ignition switch ON.
    7. Turn ignition switch OFF and wait at least 10 seconds.
    8. Drive the vehicle at speed of 100 km/h (62 MPH) for at least 1 minutes.
      CAUTION: Always drive vehicle at a safe speed.
    9. Stop the vehicle and set selector lever to P position.
    10. Make sure that "COOLAN TEMP/S" indicates more than 70°C (158°F).

      If not, warm up engine and go to next step when "COOLAN TEMP/S" indication reaches 70°C (158°F).

      NOTE: When warm engine up to normal operating temperature, perform "INSPECTION MODE 5". Refer to "DESCRIPTION ".
    11. Open engine hood.
    12. Select "HO2S2 (B1) P1146" (for DTC P0138) or "HO2S2 (B2) P1166" (for DTC P0158) of "HO2S2" in "DTC WORK SUPPORT" mode of "ENGINE with CONSULT.
    13. Start engine and follow the instruction of CONSULT display.
      NOTE: It will take at most 10 minutes until "COMPLETED" is displayed.
    14. Touch "SELF-DIAG RESULTS".

      Which is displayed on CONSULT screen? 

      OK: INSPECTION END

      NG: Go to "DIAGNOSIS PROCEDURE ".

      CON NOT BE DIAGNOSED: GO TO 4.

  4. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B AGAIN
    1. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
    2. Perform DTC confirmation procedure again.

      : GO TO  3.

  5. PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B

    Perform component function check. Refer to "COMPONENT FUNCTION CHECK ".

    NOTE: Use component function check to check the overall function of the heated oxygen sensor 2 circuit. During this check, a 1st trip DTC might not be confirmed.

    Is the inspection result normal? 

    YES: INSPECTION END

    NO: Go to "DIAGNOSIS PROCEDURE ".

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