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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 211 (Engine Control System (DTC/Circuit Diagnosis) (CUMMINS 5.0L) (1 Of 6)) >> DTC/Circuit Diagnosis >> DTC P0103-00: Mass Air Flow Sensor >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC PRIORITY 
    1. Turn ignition switch ON.
    2. Connect CONSULT and check for "ENGINE" diagnostic trouble codes.
    3. Check for DTC P0103-00 being past on the CONSULT screen.

    Is DTC P0103-00 detected as past?

    YES

    Refer to Intermittent Incident .

    NO

    GO TO 2 .

  2. CHECK INTAKE AND EXHAUST SYSTEM FOR RESTRICTIONS 
    1. Turn ignition switch OFF.
    2. Inspect the intake and exhaust systems for blockage or restrictions.:
      • Inspect the air filter for excessive dirt, soiling or other problems that can cause restricted air flow.
      • Corroded pins
      • Inspect the charge air cooler hoses/tubes and connections.
      • Inspect all air intake, crankcase vent and turbocharger related hoses/tubes and connections for damage, air leaks, or blockage.
      • Check charge air cooler restriction.
      • Inspect the exhaust system for damaged components that could cause exhaust flow blockage.

    Is the inspection result normal?

    YES

    GO TO 3 .

    NO

    Repair or replace error-detected parts.

  3. INSPECT MASS AIR FLOW SENSOR AND CONNECTOR PINS 
    1. Turn ignition switch OFF.
    2. Disconnect mass air flow sensor harness connector F104.
    3. Inspect the engine harness and mass air flow sensor connector pins for the following:
      • Loose connector
      • Corroded pins
      • Bent or broken pins
      • Pushed back or expanded pins
      • Moisture in or on the connector
      • Missing or damaged connector seals
      • Dirt or debris on or in the connector pins
      • Connector shell broken
      • Wire insulation damage
      • Damaged connector locking tab

    Is the inspection result normal?

    YES

    GO TO 4 .

    NO

    Repair or replace error-detected parts.

  4. CHECK THE SENSOR SUPPLY VOLTAGE AND RETURN CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect the mass air flow sensor harness connector F104.
    3. Turn ignition switch ON.
    4. Measure the voltage between mass air flow sensor harness connector F104 terminals 2 and 3.

      Mass air flow sensor

      Voltage

      (Approx.)

      Connector

      Terminal

      Terminal

      F104

      2

      3

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 5 .

    NO

    GO TO 6.

  5. CHECK THE CIRCUIT RESPONSE 
    1. Turn ignition switch OFF.
    2. Disconnect mass air flow sensor harness connector F104.
    3. Turn ignition switch ON and wait 30 seconds.
    4. Connect CONSULT and check for current ENGINE diagnostic trouble codes.

    Did DTC P0102-00 become current and DTC P0103 become past?

    YES

    Replace mass air flow sensor. Refer to Removal and Installation .

    NO

    GO TO 8 .

  6. INSPECT ECM AND HARNESS CONNECTOR PINS 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector F101.
    3. Inspect the ECM connector pins for the following:
      • Loose connector
      • Corroded pins
      • Bent or broken pins
      • Pushed back or expanded pins
      • Moisture in or on the connector
      • Missing or damaged connector seals
      • Dirt or debris on or in the connector pins
      • Connector shell broken
      • Wire insulation damage
      • Damaged connector locking tab

    Is the inspection result normal?

    YES

    GO TO 7 .

    NO

    Repair or replace error-detected parts.

  7. CHECK THE SENSOR SUPPLY VOLTAGE AND RETURN CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect the ECM harness connector F101.
    3. Turn ignition switch ON.
    4. Measure the voltage between ECM harness connector F101 terminals 127 and 138.

      ECM

      Voltage

      (Approx.)

      Connector

      Terminal

      Terminal

      F101

      127

      138

      Battery voltage

    Is the inspection result normal?

    YES

    Repair or replace the engine harness for an open.

    NO

    Replace the ECM. Refer to Removal and Installation .

  8. INSPECT ECM AND HARNESS CONNECTOR PINS 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector F101.
    3. Inspect the ECM connector pins for the following:
      • Loose connector
      • Corroded pins
      • Bent or broken pins
      • Pushed back or expanded pins
      • Moisture in or on the connector
      • Missing or damaged connector seals
      • Dirt or debris on or in the connector pins
      • Connector shell broken
      • Wire insulation damage
      • Damaged connector locking tab

    Is the inspection result normal?

    YES

    GO TO 9 .

    NO

    Repair or replace error-detected parts.

  9. CHECK THE CIRCUIT RESPONSE 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector F101.
    3. Turn ignition switch ON and wait 30 seconds.
    4. Connect CONSULT and check for current "ENGINE" diagnostic trouble codes.

    Did DTC P0102-00 become current and DTC P0103-00 become past?

    YES

    Repair or replace the engine harness for an open or short to voltage.

    NO

    Replace the ECM. Refer to Removal and Installation .

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