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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 891 (Engine Control System (Diagnostic Codes & Symptom Tests)) >> DTC/Circuit Diagnosis >> DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308: Misfire >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Nissan Armada. 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: GO TO 3.

    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?

    Without CONSULT 

    When disconnecting each fuel injector harness connector one at a time, is there any cylinder which does not produce a momentary engine speed drop?

    Fig 1: Identifying Fuel Injector Harness Connectors
    G08690569Courtesy of NISSAN NORTH AMERICA, INC.

    Yes or No 

    Yes: GO TO 4.

    No: GO TO  7.

  4. CHECK FUEL INJECTOR 

    Does each fuel injector make an operating sound at idle?

    Yes or No 

    Yes: GO TO 5.

    No: Check fuel injector(s) and circuit(s). Refer to FUEL INJECTOR .

    Fig 2: Checking Fuel Injector Operating Sound
    G08690570Courtesy of NISSAN NORTH AMERICA, INC.
  5. 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 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.
      Fig 3: Identifying Fuel Pump Fuse And IPDM E/R
      G08690571Courtesy of NISSAN NORTH AMERICA, INC.
    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 ".
    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 below.
    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 4: Checking Ignition Spark
      G08690572Courtesy of NISSAN NORTH AMERICA, INC.
      CAUTION:
      • During the operation, always stay 0.5 m (1.6 ft) or more away from the spark plug and the ignition coil. Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20kV or more.
      • It might cause to damage the ignition coil if the gap of more than 17 mm (0.66 in) is taken.
      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  9.

      NG: GO TO 6.

  6. 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. 

      Fig 5: Checking Spark Plug
      G08690573Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO 7.

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

  7. CHECK SPARK PLUG 

    Check the initial spark plug for fouling, etc.

    OK or NG 

    OK: Replace malfunctioning 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 8. 
  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. 

      OK or NG 

      OK: INSPECTION END

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

  9. CHECK COMPRESSION PRESSURE 

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

    OK or NG 

    OK: GO TO 10.

    NG: 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 "FUEL PRESSURE CHECK ".
    3. Install fuel pressure gauge and check fuel pressure. Refer to "FUEL PRESSURE CHECK ".

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

      OK or NG 

      OK: GO TO  12.

      NG: GO TO 11.

  11. DETECT MALFUNCTIONING PART 

    Check the following.

  12. CHECK IGNITION TIMING 

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

    Items Specifications
    Target idle speed 650 ± 50 RPM (in P or N position)
    Ignition timing 15 ± 5° BTDC (in P or N position)

    OK or NG 

    OK: GO TO 13.

    NG: Follow the "BASIC INSPECTION ".

  13. CHECK A/F SENSOR 1 INPUT SIGNAL 
    1. Turn ignition switch OFF.
    2. Disconnect A/F sensor 1 harness connector.
      Fig 6: Identifying Air Fuel Ratio Sensor 1 And Harness Connector
      G08690574Courtesy of NISSAN NORTH AMERICA, INC.
    3. Disconnect ECM harness connector.
    4. Check harness continuity between the following terminals.

      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 14.

      NG: Repair open circuit or short to ground or short to power in harness or connectors.

  14. CHECK A/F SENSOR 1 HEATER 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO  16.

    NG: GO TO 15.

  15. REPLACE AIR FUEL RATIO (A/F) SENSOR 1 

    Replace malfunctioning air fuel ratio (A/F) sensor 1. Refer to EXHAUST MANIFOLD AND THREE WAY CATALYST .

    CAUTION:
    • Discard any air fuel ratio (A/F) sensor which has been dropped from a height of more than 0.5 m (1.6 ft) onto a hard surface such as a concrete floor; use a new one.
    • Before installing new air fuel ratio (A/F) sensor, clean exhaust system threads (using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12) and approved anti-seize lubricant.

    INSPECTION END 

  16. CHECK MASS AIR FLOW SENSOR 

    With CONSULT 

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

    3.0 - 9.0 g/s: at idling 

    9.0 - 28.0 g/s: at 2, 500 RPM 

    With GST 

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

    3.0 - 9.0 g/s: at idling 

    9.0 - 28.0 g/s: at 2, 500 RPM 

    OK or NG 

    OK: GO TO 17.

    NG: Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or ground. Refer to P0101 MAF SENSOR .

  17. CHECK SYMPTOM MATRIX CHART 

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

    OK or NG 

    OK: GO TO 18.

    NG: Repair or replace.

  18. 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 "DTC INDEX ".

    : GO TO 19.

  19. CHECK INTERMITTENT INCIDENT 

    Refer to "HOW TO CHECK TERMINAL " and "INTERMITTENT INCIDENT ".

    INSPECTION END 

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