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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1182 (Engine Control System - DTCS P0222 To P0607 (VQ40DE)) >> DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308: Misfire >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR INTAKE AIR LEAK AND PCV HOSE
    1. Start engine and run it at idle speed.
    2. Listen for the sound of the intake air leak.
    3. Check PCV hose connection.

    OK or NG 

    OK: GO TO 2.

    NG: Discover air leak location and repair.

  2. CHECK FOR EXHAUST SYSTEM CLOGGING

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

    OK or NG 

    OK (With CONSULT)>>GO TO 3.

    OK (Without CONSULT)>>GO TO  4.

    NG: Repair or replace it.

  3. PERFORM POWER BALANCE TEST

    With CONSULT 

    1. Perform "POWER BALANCE" in "ACTIVE TEST" mode.
    2. Is there any cylinder which does not produce a momentary engine speed drop?

    Yes or No 

    Yes: GO TO 4.

    No: GO TO  10.

  4. CHECK FUNCTION OF FUEL INJECTOR-I

    Stop engine.

    1. Disconnect harness connector F44 (3), F201 (1)
      Fig 1: Identifying Vacuum Tank, F44 And F201 Harness Connectors
      G08170542Courtesy of NISSAN NORTH AMERICA, INC.
    2. Turn ignition switch ON.
    3. Check voltage between harness connector F44 terminal 3 and ground with CONSULT or tester.

      Voltage: Battery voltage 

    4. Turn ignition switch OFF.
    5. Disconnect ECM harness connector.
    6. Check harness continuity between harness connector F44 and ECM as follows.

      Refer to WIRING DIAGRAM .

      Cylinder Harness connector F44 terminal ECM terminal
      1 2 23
      3 1 22
      5 4 21

      Continuity should exist  .

      Fig 2: Checking Harness Continuity Between Harness Connector F44 And ECM
      G08170543Courtesy of NISSAN NORTH AMERICA, INC.
    7. Also check harness for short to ground and short to power.

    OK or NG 

    OK: GO TO 5.

    NG: Perform trouble diagnosis for FUEL INJECTOR, refer to "DIAGNOSIS PROCEDURE ".

  5. CHECK FUNCTION OF FUEL INJECTOR-II

    Provide battery voltage between harness connector F201 as follows and then interrupt it. Listen to each fuel injector operating sound.

    Cylinder Harness connector F201 terminal
    (+) (-)
    1 3 2
    3 3 1
    5 3 4

    Operating sound should exist  .

    OK or NG 

    Fig 3: Applying Battery Voltage Between Harness Connector F201 Terminals
    G08170544Courtesy of NISSAN NORTH AMERICA, INC.

    OK: GO TO 6.

    NG: Perform trouble diagnosis for FUEL INJECTOR, refer to "DIAGNOSIS PROCEDURE ".

  6. CHECK FUNCTION OF FUEL INJECTOR-III
    1. Reconnect all harness connector disconnected.
    2. Start engine.
    3. Listen to fuel injectors No. 2, No. 4, No. 6 operating sound.

    Clicking noise should exist  .

    OK or NG 

    OK: GO TO 7.

    NG: Perform trouble diagnosis for FUEL INJECTOR, refer to "DIAGNOSIS PROCEDURE ".

    Fig 4: Checking Fuel Injector Operating Sound
    G08170545Courtesy of NISSAN NORTH AMERICA, INC.
  7. 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 (No. 48) in IPDM E/R to release fuel pressure.
      NOTE: Do not use CONSULT 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. Refer to "REMOVAL AND INSTALLATION ".
      Fig 5: Identifying Fuel Pump Fuse And IPDM E/R
      G08170546Courtesy of NISSAN NORTH AMERICA, INC.
    8. Crank engine for five 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 three seconds, and check whether spark is generated between the spark plug and the grounded metal portion.

    Spark should be generated  .

    CAUTION:
    • Never place to the spark plug and the ignition coil within 50cm (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 cause to damage the ignition coil if the gap of more than 17 mm (0.66 in) is made.
    Fig 6: Identifying Spark Length Between Spark Plug Edge And Grounded Metal Portion
    G08170547Courtesy of NISSAN NORTH AMERICA, INC.
    NOTE: When the gap is less than 13 mm (0.52 in), the spark might be generated even if the coil is malfunctioning.

    OK or NG 

    OK: GO TO  11.

    NG: GO TO 8.

  8. CHECK FUNCTION OF IGNITION COIL-II
    1. Turn ignition switch OFF.
    2. Disconnect spark plug and connect a known-good spark plug.
    3. Crank engine for about three seconds, and recheck whether spark is generated between the spark plug and the grounded metal portion.

    Spark should be generated  .

    OK or NG 

    OK: GO TO 9.

    NG: Check ignition coil, power transistor and their circuits. Refer to "DIAGNOSIS PROCEDURE ".

  9. CHECK SPARK PLUG

    Check the initial spark plug for fouling, etc.

    OK or NG 

    OK: Replace spark plug(s) with standard type one(s). For spark plug type, refer to "REMOVAL AND INSTALLATION ".

    NG >>

    1. Repair or clean spark plug.
    2. GO TO 10.
    Fig 7: Identifying Initial Spark Plug
    G08170548Courtesy of NISSAN NORTH AMERICA, INC.
  10. CHECK FUNCTION OF IGNITION COIL-III
    1. Reconnect the initial spark plugs.
    2. Crank engine for about three seconds, and recheck whether spark is generated between the spark plug and the grounded portion.

    Spark should be generated  .

    OK or NG 

    OK: INSPECTION END 

    NG: Replace spark plug(s) with standard type one(s). For spark plug type, refer to "REMOVAL AND INSTALLATION ".

  11. CHECK COMPRESSION PRESSURE

    Check compression pressure. Refer to "COMPRESSION PRESSURE ".

    OK or NG 

    OK: GO TO 12.

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

  12. CHECK FUEL PRESSURE
    1. Install all removed parts.
    2. Release fuel pressure to zero. Refer to "FUEL PRESSURE CHECK ".
    3. Install fuel pressure gauge and check fuel pressure. Refer to "FUEL PRESSURE CHECK ".

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

    OK or NG 

    OK: GO TO  14.

    NG: GO TO 13.

  13. DETECT MALFUNCTIONING PART

    Check the following.

    Repair or replace.

  14. CHECK IGNITION TIMING

    Check the following items. Refer to "BASIC INSPECTION ".

    Items Specifications
    Target idle speed 625 ± 50 RPM (in P or N position)
    Ignition timing 15 ± 5° BTDC (in P or N position)

    OK or NG 

    OK: GO TO 15.

    NG: Follow the "BASIC INSPECTION ".

  15. CHECK A/F SENSOR 1 INPUT SIGNAL
    1. Turn ignition switch OFF.
    2. Disconnect A/F sensor 1 harness connector.
      Fig 8: Identifying A/F Sensor 1 Harness Connector
      G08170549Courtesy of NISSAN NORTH AMERICA, INC.
    3. Disconnect ECM harness connector.
    4. Check harness continuity between A/F sensor 1 terminal and ECM terminal as follows.

      Refer to WIRING DIAGRAM .

        A/F sensor 1 terminal ECM terminal
      Bank 1 1 35
      2 56
      Bank 2 1 16
      2 75

      Continuity should exist  .

    5. Check harness continuity between the following terminals and ground.

      Refer to WIRING DIAGRAM .

      Bank 1 Bank 2
      A/F sensor 1 terminal ECM terminal A/F sensor 1 terminal ECM terminal
      1 35 1 16
      2 56 2 75

      Continuity should not exist  .

    6. Also check harness for short to power.

    OK or NG 

    OK: GO TO 16.

    NG: Repair open circuit or short to ground or short to power in harness or connectors between ECM and A/F sensor 1.

  16. CHECK A/F SENSOR 1 HEATER

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO  18.

    NG: GO TO 17.

  17. REPLACE A/F SENSOR 1

    Replace malfunctioning A/F sensor 1. Refer to "EXPLODED VIEW ".

    CAUTION:
    • Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
    • Before installing new A/F sensor, clean exhaust system threads using Heated Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

    INSPECTION END 

  18. CHECK MASS AIR FLOW SENSOR

    With CONSULT 

    Check mass air flow sensor signal in "DATA MONITOR" mode with CONSULT.

    2.0 - 6.0 g/s: at idling 

    7.0 - 20.0 g/s: at 2, 500 RPM 

    With GST 

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

    2.0 - 6.0 g/s: at idling 

    7.0 - 20.0 g/s: at 2, 500 RPM 

    OK or NG 

    OK: GO TO 19.

    NG: Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or ground. Refer to "COMPONENT INSPECTION ".

  19. CHECK SYMPTOM MATRIX CHART

    Check items on the rough idle symptom in "SYMPTOM MATRIX CHART ".

    OK or NG 

    OK: GO TO 20.

    NG: Repair or replace.

  20. 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 "ON BOARD DIAGNOSIS FUNCTION " (Without CONSULT) or "CONSULT FUNCTION " (With CONSULT).

    GO TO 21.

  21. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END 

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