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Home >> Infiniti >> 2012 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0137 To P0463 >> DTC P0138, P0158: Ho2S2 >> DTC Logic >> DTC Confirmation Procedure

DTC Confirmation Procedure

  1. PRECONDITIONING
    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. Start engine and warm it up to the normal operating temperature.
    2. Turn ignition switch OFF and wait at least 10 seconds.
    3. Turn ignition switch ON.
    4. Turn ignition switch OFF and wait at least 10 seconds.
    5. Start engine and keep the engine speed between 3, 500 and 4, 000 rpm for at least 1 minute under no load.
    6. Let engine idle for 2 minutes.
    7. Check 1st trip DTC.

    Is 1st trip DTC detected? 

    YES: Go to "DIAGNOSIS PROCEDURE ".

    NO-1: With CONSULT: GO TO 3.

    NO-2: With GST: GO TO  5.

  3. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B

    WITH CONSULT

    NOTE: For better results, perform "DTC WORK SUPPORT" at a temperature of 0 to 30°C (32 to 86°F).
    1. Start engine and warm it up to the normal operating temperature.
    2. Turn ignition switch OFF and wait at least 10 seconds.
    3. Turn ignition switch ON.
    4. Turn ignition switch OFF and wait at least 10 seconds.
    5. Start engine and keep the engine speed between 3, 500 and 4, 000 rpm for at least 1 minute under no load.
    6. Let engine idle for 1 minute.
    7. Select "DATA MONITOR" mode with CONSULT.
    8. Check 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).

    9. Open engine hood.
    10. Select "HO2S2 (B1) P1146" (for DTC P0138) or "HO2S2 (B2) P1166" (for DTC P0158) of "HO2S2" in "DTC WORK SUPPORT" mode with CONSULT.
    11. Follow the instruction of CONSULT display.
      NOTE: It will take at most 10 minutes until "COMPLETED" is displayed.
    12. 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

    WITH GST

    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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