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Home >> Nissan-Datsun >> 2005 >> Altima SE-R, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control System - VQ35DE >> DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306: Multiple Cylinder Misfire, No. 1-6 Cylinder Mis Fire >> Diagnostic Procedure

Diagnostic Procedure

  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-II): GO TO 3.
    • OK (Without CONSULT-II): GO TO  4.
    • NG: Repair or replace it.
  3. PERFORM POWER BALANCE TEST 

    With CONSULT-II 

    1. Perform "POWER BALANCE" in "ACTIVE TEST" mode.
    2. Is there any cylinder which does not produce a momentary engine speed drop?
      Fig 1: Identifying Consult-II Active Test
      G02525801Courtesy of NISSAN MOTOR CO., U.S.A.

    Yes or No 

    • Yes: GO TO 4.
    • No: GO TO  10.
  4. CHECK FUNCTION OF INJECTOR-I 
    1. Stop engine.
    2. Disconnect harness connector F44, F101.
    3. Turn ignition switch ON.
      Fig 2: Disconnecting Harness Connector F44, F101
      G02525802Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between harness connector F44 terminal 6 (with triple meters) or 5 (without triple meters) and ground with CONSULT-II or tester.
      Fig 3: Checking Voltage Between Harness Connector F44 Terminal 6 Or 5 And Ground
      G02525803Courtesy of NISSAN MOTOR CO., U.S.A.

      Voltage: Battery voltage 

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

      Refer to WIRING DIAGRAM .

      With triple meters 

      CYLINDER AND CONNECTOR TERMINALS

      Cylinder Harness connector F44 ECM terminal
      1 1 23
      3 3 22
      5 7 21

      Without triple meters 

      CYLINDER AND CONNECTOR TERMINALS

      Cylinder Harness connector F44 ECM terminal
      1 6 23
      3 2 22
      5 1 21

      Continuity should exist. 

    8. Also check harness for short to ground and short to power.

    OK or NG 

    • OK: GO TO 5.
    • NG: Perform trouble diagnosis for INJECTOR CIRCUIT, refer to INJECTOR CIRCUIT .
  5. CHECK FUNCTION OF INJECTOR-II 

    Provide battery voltage between harness connector F101 as follows and then interrupt it. Listen to each injector operating sound.

    Fig 4: Checking Function Of Injector-II
    G02525804Courtesy of NISSAN MOTOR CO., U.S.A.

    With triple meters 

    Fig 5: Cylinder And Connector Terminal Reference With Triple Meters
    G02525805Courtesy of NISSAN MOTOR CO., U.S.A.

    Without triple meters 

    Fig 6: Cylinder And Connector Terminal Reference Without Triple Meters
    G02525806Courtesy of NISSAN MOTOR CO., U.S.A.

    Operating sound should exist. 

    OK or NG 

    • OK: GO TO 6.
    • NG: Perform trouble diagnosis for INJECTOR CIRCUIT, refer to INJECTOR CIRCUIT .
  6. CHECK FUNCTION OF INJECTOR-III 
    1. Reconnect all harness connector disconnected.
    2. Start engine.
    3. Listen to 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 INJECTOR CIRCUIT, refer to INJECTOR CIRCUIT .
      Fig 7: Checking Function Of Injector-III
      G02525807Courtesy of NISSAN MOTOR CO., U.S.A.
  7. CHECK FUNCTION OF IGNITION COIL-I 
    CAUTION: Do the following procedure in the place where ventilation is good without the combustible.
    1. Turn ignition switch OFF.
    2. Remove fuel pump fuse in IPDM E/R to release fuel pressure.
      NOTE: Do not use CONSULT-II to release fuel pressure, or fuel pressure applies again during the following procedure.
    3. Start engine.
    4. After engine stalls, crank it 2 or 3 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.
      Fig 8: Removing Fuel Pump Fuse In IPDM E/R
      G02525808Courtesy of NISSAN MOTOR CO., U.S.A.
    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 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:
    • Do not approach to the spark plug and the ignition coil within 50cm. Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20kV or more.
      Fig 9: Fixing Ignition Coil Using Rope
      G02525809Courtesy of NISSAN MOTOR CO., U.S.A.
    • It might cause to damage the ignition coil if the gap of 17 mm or more is taken.
    NOTE: When the gap is 13 mm or less, 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 3 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 "IGNITION SIGNAL ".
  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 CHANGING SPARK PLUGS (PLATINUM - TIPPED TYPE) .
    • NG: 1. Repair or clean spark plug. 2. GO TO 10.
      Fig 10: Checking Initial Spark Plug For Fouling
      G02525810Courtesy of NISSAN MOTOR CO., U.S.A.
  10. 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. 

    OK or NG 

  11. CHECK COMPRESSION PRESSURE 

    Check compression pressure. Refer to " CHECKING COMPRESSION PRESSURE ".

    Standard: 1, 275 kPa (13.0 kg/cm 2  , 185 psi)/300 RPM 

    Minimum: 981 kPa (10.0 kg/cm 2  , 142 psi)/300 RPM 

    Difference between each cylinder: 98 kPa (1. 0 kg/cm 2  , 14 psi)/300 RPM 

    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 RELEASE ".
    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 ".

    Fig 11: Ignition Timing Specification
    G02525811Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

  15. CHECK A/F SENSOR 1 INPUT SIGNAL 
    1. Turn ignition switch OFF.
    2. Disconnect A/F sensor 1 harness connector.
      Fig 12: Disconnecting A/F Sensor 1 Harness Connector
      G02525812Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Disconnect ECM harness connector.
    4. Check harness continuity between the following terminals.

      Refer to WIRING DIAGRAM .

      Fig 13: Sensor Terminals Reference Chart
      G02525813Courtesy of NISSAN MOTOR CO., U.S.A.

      Continuity should exist. 

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

      Refer to WIRING DIAGRAM .

      Fig 14: Sensor Terminals Reference Chart
      G02525814Courtesy of NISSAN MOTOR CO., U.S.A.

      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 17.
    • NG: Replace (malfunctioning) A/F sensor 1.
  17. CHECK MASS AIR FLOW SENSOR 

    With CONSULT-II 

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

    2.0 - 6.0 g.m/sec: at idling 

    7.0 - 20.0 g.m/sec: at 2, 500 RPM 

    With GST 

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

    2.0 - 6.0 g.m/sec: at idling 

    7.0 - 20.0 g.m/sec: at 2, 500 RPM 

    OK or NG 

    • OK: GO TO 18.
    • NG: Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or ground. Refer to "DTC P0101 MAF SENSOR ".
  18. CHECK SYMPTOM MATRIX CHART 

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

    OK or NG 

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