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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1165 (Engine Control System - DTCS P0137 To P0448) >> P0300, P0301, P0302, P0303, P0304, P0305, P0306 Misfire >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR INTAKE AIR LEAKAGE AND PCV HOSE
    1. Start engine and run it at idle speed.
    2. Listen for the sound of the intake air leakage.
    3. Check PCV hose connection.

    Is intake air leakage detected? 

    YES: Discover air leakage location and repair.

    NO: GO TO 2.

  2. CHECK FOR EXHAUST SYSTEM CLOGGING

    Stop engine and visually check exhaust tube, three way catalyst and muffler for dents.

    Is the inspection result normal? 

    YES-1: With CONSULT-III: GO TO 3.

    YES-2: Without CONSULT-III: GO TO 4.

    NO: Repair or replace malfunctioning part.

  3. PERFORM POWER BALANCE TEST

    With CONSULT-III 

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

    Is the inspection result normal? 

    YES: GO TO 9.

    NO: GO TO 4.

  4. CHECK FUNCTION OF FUEL INJECTOR
    1. Start engine and let it idle.
    2. Listen to each fuel injector operation.

    Clicking sound should be heard. 

    Fig 1: Checking Fuel Injector Operation
    G05869824Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: Perform trouble diagnosis for FUEL INJECTOR, refer to "DIAGNOSIS PROCEDURE ".

  5. CHECK FUNCTION OF IGNITION COIL-I
    CAUTION: Perform the following procedure in a place with no combustible objects and good ventilation.
    1. Turn ignition switch OFF.
    2. Remove fuel pump fuse in IPDM E/R to release fuel pressure.
      NOTE: Do not use CONSULT-III to release fuel pressure, or fuel pressure applies again during the following procedure.
    3. Start engine.
    4. After engine stalls, crank it two or three times to release all fuel pressure.
    5. Turn ignition switch OFF.
    6. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.
    7. Remove ignition coil and spark plug of the cylinder to be checked.
    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. Fix ignition coil using a rope etc. with gap of 13 - 17 mm (0.52 - 0.66 in) between the edge of the spark plug and grounded metal portion as shown in the figure.
    11. Crank engine for about 3 seconds, and check whether spark is generated between the spark plug and the grounded metal portion.

    Spark should be generated. 

    Fig 2: Checking Whether Spark Generated Between Spark Plug And Grounded Metal Portion
    G05869825Courtesy of NISSAN MOTOR CO., U.S.A.
    CAUTION:
    • Never place the spark plug and the ignition coil within 50 cm (19.7 in) each other. Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20 kV or more.
    • It might damage the ignition coil if the gap of more than 17 mm (0.66 in) is made.
    NOTE: When the gap is less than 13 mm (0.52 in), a spark might be generated even if the coil is malfunctioning.

    Is the inspection result normal? 

    YES: GO TO 9.

    NO: GO TO 6.

  6. CHECK FUNCTION OF IGNITION COIL-II
    1. Turn ignition switch OFF.
    2. Disconnect spark plug and connect a non-malfunctioning spark plug.
    3. Crank engine for about 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 7.

    NO: Check ignition coil, power transistor and their circuits. Refer to "DIAGNOSIS PROCEDURE ".

  7. CHECK SPARK PLUG

    Check the initial spark plug for fouling, etc.

    Is the inspection result normal? 

    YES: Replace spark plug(s) with standard type one(s). For spark plug type, refer to "SPARK PLUG ".

    NO: Repair or clean spark plug. Then GO TO 8.

    Fig 3: Identifying Spark Plug
    G05869826Courtesy of NISSAN MOTOR CO., U.S.A.
  8. CHECK FUNCTION OF IGNITION COIL-III
    1. Reconnect the initial spark plugs.
    2. Crank engine for about 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: INSPECTION END

    NO: Replace spark plug(s) with standard type one(s). For spark plug type, refer to "SPARK PLUG ".

  9. CHECK COMPRESSION PRESSURE

    Check compression pressure. Refer to "ON-VEHICLE SERVICE ".

    Is the inspection result normal? 

    YES: GO TO 10.

    NO: Check pistons, piston rings, valves, valve seats and cylinder head gaskets.

  10. CHECK FUEL PRESSURE
    1. Install all removed parts.
    2. Release fuel pressure to zero. Refer to "INSPECTION ".
    3. Install fuel pressure gauge kit [SST (J-44321)] and check fuel pressure. Refer to "INSPECTION ".

    At idle: Approximately 350 kPa (3.57 kg/cm 2  , 51 psi) 

    Is the inspection result normal? 

    YES: GO TO 12.

    NO: GO TO 11.

  11. DETECT MALFUNCTIONING PART

    Check fuel hoses and fuel tubes for clogging.

    Is the inspection result normal? 

    YES: Replace "fuel filter and fuel pump assembly".

    NO: Repair or replace malfunctioning part.

  12. CHECK IGNITION TIMING

    Check idle speed and ignition timing.

    For procedure, refer to "BASIC INSPECTION: SPECIAL REPAIR REQUIREMENT ".

    For specification, refer to "IDLE SPEED " and "IGNITION TIMING ".

    Is the inspection result normal? 

    YES: GO TO 13.

    NO: Follow the "BASIC INSPECTION: SPECIAL REPAIR REQUIREMENT ".

  13. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect corresponding A/F sensor 1 harness connector.
    3. Disconnect ECM harness connector.
    4. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
      CONTINUITY CHART

      A/F sensor 1 ECM Continuity
      Bank Connector Terminal Connector Terminal
      1 F12 1 F13 45 Existed
      2 49
      2 F61 1 53
      2 57
    5. Check the continuity between A/F sensor 1 harness connector and ground, or ECM harness connector and ground.
      CONTINUITY CHART

      A/F sensor 1 Ground Continuity
      Bank Connector Terminal
      1 F12 1 Ground Not existed
      2
      2 F61 1
      2
      CONTINUITY CHART

      ECM Ground Continuity
      Connector Terminal
      F13 45 Ground Not existed
      49
      53
      57
    6. Also check harness for short to power.

    Is the inspection result normal? 

    YES: GO TO 14.

    NO: Repair open circuit, short to ground or short to power in harness or connectors.

  14. CHECK A/F SENSOR 1 HEATER

    Refer to "COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 15.

    NO: Replace (malfunctioning) A/F sensor 1.

  15. CHECK MASS AIR FLOW SENSOR

    With CONSULT-III 

    1. Check "MASS AIR FLOW" in "DATA MONITOR" mode with CONSULT-III.
    2. For specification, refer to "MASS AIR FLOW SENSOR ".

    With GST 

    1. Check mass air flow sensor signal in Service $01 with GST.
    2. For specification, refer to "MASS AIR FLOW SENSOR ".

    Is the measurement value within the specification? 

    YES: GO TO 16.

    NO: Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or ground. Refer to "DIAGNOSIS PROCEDURE ".

  16. CHECK SYMPTOM TABLE

    Check items on the rough idle symptom in "SYMPTOM TABLE ".

    Is the inspection result normal? 

    YES: GO TO 17.

    NO: Repair or replace malfunctioning part.

  17. ERASE THE 1ST TRIP DTC

    Some tests may cause a 1st trip DTC to be set.

    Erase the 1st trip DTC from the ECM memory after performing the tests. Refer to "DIAGNOSIS DESCRIPTION ".

    : GO TO 18.

  18. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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