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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Control System (DTC/Circuit Diagnosis) (5.6L) (2 Of 6)) >> DTC/Circuit Diagnosis >> DTC P0138: Ho2S2 >> DTC Confirmation Procedure

DTC Confirmation Procedure

WARNING: This page is about a different variant/trim than selected.
  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

    With CONSULT: GO TO 3.

    NO

    With GST: GO TO 5.

  3. PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B 

    SYMBOL WITH CONSULT

    NOTE: For better results, perform "DTC WORK SUPPORT" at a temperature of 0 to 30 deg.C (32 to 86 deg.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 deg.C (158 deg.F).

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

    Is "OK" displayed on CONSULT screen?

    YES

    To check malfunction symptom before repair: Refer to Intermittent Incident .

    YES

    Confirmation after repair: INSPECTION END

    NO

    "NG" is displayed: Proceed to Diagnosis Procedure .

    NO

    "CAN NOT BE DIAGNOSED" is displayed: 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-I 
    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.

    SYMBOL WITH GST

    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. Check the voltage between ECM harness connector terminals under the following conditions.

      DTC

      ECM

      Condition

      Voltage

      +

      -

      Connector

      Terminal

      Connector

      Terminal

      P0138

      F79

      84

      F78

      43

      Revving up to 4, 000 rpm under no load at least 10 times

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

      P0158

      77

    Is the inspection result normal?

    YES

    To check malfunction symptom before repair: Refer to Intermittent Incident .

    YES

    Confirmation after repair: INSPECTION END

    NO

    GO TO 6.

  6. PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B-II 

    Check the voltage between ECM harness connector terminals under the following conditions.

    DTC

    ECM

    Condition

    Voltage

    +

    -

    Connector

    Terminal

    Connector

    Terminal

    P0138

    F79

    84

    F78

    43

    Keeping engine at idle for 10 minutes

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

    P0158

    77

    Is the inspection result normal?

    YES

    To check malfunction symptom before repair: Refer to Intermittent Incident .

    YES

    Confirmation after repair: INSPECTION END

    NO

    GO TO 7.

  7. PERFORM COMPONENT FUNCTION CHECK FOR MALFUNCTION B-III 

    Check the voltage between ECM harness connector terminals under the following conditions.

    DTC

    ECM

    Condition

    Voltage

    +

    -

    Connector

    Terminal

    Connector

    Terminal

    P0138

    F79

    84

    F78

    43

    Coasting from 80 km/h (50 MPH) with selector lever in the D position

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

    P0158

    77

    Is the inspection result normal?

    YES

    To check malfunction symptom before repair: Refer to Intermittent Incident .

    YES

    Confirmation after repair: INSPECTION END

    NO

    Proceed to Diagnosis Procedure .

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