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Home >> Nissan-Datsun >> 2019 >> Altima Edition ONE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Control System (DTC/Circuit Diagnosis) (Pr25DD) (4 Of 4)) >> DTC/Circuit Diagnosis >> P219A Air Fuel Ratio >> DTC Diagnosis Procedure >> PR25DD engine

PR25DD engine

WARNING: This page is about a different variant/trim than selected.
NOTE: Do not replace A/F sensor when DTC P219A is detected.

A/F sensor malfunction is not related to DTC P219A.

  1. CHECK DTC PRIORITY 

    If DTC P219A is displayed with other DTC, first perform the trouble diagnosis for the other DTC.

    Is applicable DTC detected?

    YES

    Perform diagnosis of applicable. Refer to DTC Index .

    NO

    GO TO 2.

  2. CHECK FOR INTAKE AIR LEAK 
    1. Stop engine and check the following for connection.
      • Air duct
      • Vacuum hoses
      • PCV hose
      • Intake air passage between air duct to intake manifold
    2. Start engine and let it idle.
    3. Listen for an intake air leak after the mass air flow sensor.

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair or replace error-detected parts.

  3. CHECK EXHAUST GAS LEAK 
    1. Stop engine and visually check exhaust tube, three way catalyst and muffler for dents connection.
    2. Start engine and let it idle.
    3. Listen for an exhaust gas leak before three way catalyst (manifold).
      G04886828Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Repair or replace error-detected parts.

  4. CHECK FUEL PRESSURE 
    1. Release fuel pressure to zero. Refer to Work Procedure .
    2. Check fuel pressure. Refer to Work Procedure .

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    GO TO 9.

  5. CHECK MASS AIR FLOW SENSOR 

    SYMBOL With CONSULT

    Check "MASS AIR FLOW" in "DATA MONITOR" mode of "ENGINE" using CONSULT.

    For specification, Refer to MASS AIR FLOW SENSOR : Service Data .

    SYMBOL With GST

    Check mass air flow sensor signal in Service $01 using GST.

    For specification, Refer to MASS AIR FLOW SENSOR : Service Data i .

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or grounds. Refer to DTC Diagnosis Procedure .

  6. CHECK FUNCTION OF FUEL INJECTOR-1 

    SYMBOL With CONSULT

    1. Start engine.
    2. Perform "POWER BALANCE" in "ACTIVE TEST" mode of "ENGINE" using CONSULT.
    3. Check that each circuit produces a momentary engine speed drop.

    SYMBOL Without CONSULT

    1. Let engine idle.
    2. Listen to each fuel injector operating sound.
      G04812223Courtesy of NISSAN NORTH AMERICA, INC.

      Clicking noise should be heard.

    Is the inspection result normal?

    YES

    GO TO 7.

    NO

    Perform trouble diagnosis for fuel injector, Refer to Component Function Check .

  7. CHECK FUNCTION OF IGNITION COIL-1 
    CAUTION: Perform the following steps in a well-ventilated area with no combustibles.
    1. Turn ignition switch OFF.
    2. Remove fuel pump fuse from IPDM E/R to release fuel pressure.
      NOTE: CONSULT must not be used to release fuel pressure. It develops again during the following steps, if released by using CONSULT.
    3. Start the engine.
    4. After an engine stall, crank the engine two or three times to release all the fuel pressure.
    5. Turn ignition switch OFF.
    6. Disconnect all the harness connectors of ignition coil to prevent electric discharge from occurring in ignition coil.
    7. Remove ignition coil assembly and spark plug of cylinder. Refer to Removal & Installation .
    8. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
    9. Connect spark plug and harness connector to ignition coil.
    10. Allow a 13-17mm (0.52-0.66 in) spacing between spark plug and grounded metal portion as shown in the figure to fix the ignition coil with a rope or an equivalent.
      G04886523Courtesy of NISSAN NORTH AMERICA, INC.
    11. Crank the engine for approximately 3 seconds to see if sparking occurs between spark plug and the grounded metal portion.

      Spark should be generated.
      CAUTION:
      • The discharge voltage becomes 20 kV or higher. Therefore, always stay away from the spark plug and ignition coil at least 50 cm (19.7 in) during the inspection.
      • Leaving a space of more than 17mm (0.66 in) may damage the ignition coil.
      NOTE: When the gap is less than 13 mm (0.52 in), a the spark might be generated even if the coil is malfunctioning.

    Is the inspection result normal?

    YES

    GO TO 8.

    NO

    GO TO 10.

  8. CHECK COMPRESSION PRESSURE 

    Check compression pressure. Refer to Work Procedure .

    Is the inspection result normal?

    YES

    Check intermittent incident. Refer to Inspection .

    NO

    Check pistons, piston rings, valves, valve seats and cylinder head gaskets.

  9. DETECT MALFUNCTIONING PART 

    Check fuel hoses and fuel tubes for clogging.

    Is the inspection result normal?

    YES

    Replace fuel filter and fuel pump assembly. Refer to Removal & Installation (AWD), Removal & Installation (FWD).

    NO

    Repair or replace error-detected parts.

  10. CHECK FUNCTION OF IGNITION COIL-2 
    1. Turn ignition switch OFF.
    2. Disconnect spark plug and connect a non-malfunctioning spark plug.
    3. Crank engine for approximately 3 seconds, and recheck whether spark is generated between the spark plug and the grounded metal portion.

      Spark should be generated.

    Is the inspection result normal?

    YES

    GO TO 11.

    NO

    Check ignition coil, power transistor and their circuits. Refer to Component Function Check .

  11. CHECK SPARK PLUG 

    Check the initial spark plug for fouling, etc.

    G04185314Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal?

    YES

    1. Repair or clean spark plug. Refer to Removal & Installation .
    2. GO TO 12.

    NO

    Replace spark plug(s) with standard type one(s). For spark plug type, Refer to Service Data .

  12. CHECK FUNCTION OF IGNITION COIL-3 
    1. Reconnect the initial spark plugs.
    2. Crank engine for approximately 3 seconds, and recheck whether spark is generated between the spark plug and the grounded portion.

      Spark should be generated.

    Is the inspection result normal?

    YES

    Check intermittent incident. Refer to Inspection .

    NO

    Replace spark plug(s) with standard type one(s). For spark plug type, Refer to Service Data .

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