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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2389 (Engine Control System - DTCS P0171 To P0453) >> DTC P0300 - P0306 Multiple Cylinder Misfire, No. 1 - 6 Cylinder Misfire >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2007 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-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.
      Fig 1: Identifying CONSULT-II Display - ACTIVE TEST
      G04900123Courtesy of NISSAN NORTH AMERICA, INC.
    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, F101.
      Fig 2: Identifying Harness Connector F44 And F101
      G04896951Courtesy of NISSAN NORTH AMERICA, INC.
    2. Turn ignition switch ON.
    3. Check voltage between harness connector F44 terminal 3 and ground with CONSULT-II 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 .

      Fig 3: Checking Voltage Between Harness Connector F44 Terminal 3 And Ground
      G04896952Courtesy of NISSAN NORTH AMERICA, INC.
      VOLTAGE CHART

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

      Continuity should exist. 

    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 FUEL INJECTOR .

  5. CHECK FUNCTION OF FUEL INJECTOR-II 

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

    VOLTAGE CHART

    Cylinder Harness connector F101 terminal
    (+) (-)
    1 3 2
    3 3 1
    5 3 4

    Operating sound should exist. 

    Fig 4: Applying Battery Voltage Between Harness Connector F101
    G04896953Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO 6.

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

  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. 

      Fig 5: Checking Fuel Injector
      G04900354Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO 7.

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

  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. Fig 6: Identifying Fuel Pump Fuse
      G04894170Courtesy of NISSAN NORTH AMERICA, INC.
    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 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 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. 

      Fig 7: Checking Gap Between Edge Of Spark Plug And Grounded Metal Portion
      G04875164Courtesy of NISSAN NORTH AMERICA, INC.
      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.
      • It might cause to damage the ignition coil if the gap of more than 17 mm is taken.
      NOTE: When the gap is less than 13 mm, 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 IGNITION SIGNAL .

  9. CHECK SPARK PLUG 

    Check the initial spark plug for fouling, etc.

    Fig 8: Identifying Carbon On Spark Plug
    G04875165Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: Replace spark plug(s) with standard type one(s). For spark plug type, refer to "CHANGING SPARK PLUGS ".

    NG:

    1. Repair or clean spark plug.
    2. GO TO 10.
  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 "CHANGING SPARK PLUGS ".

  11. CHECK COMPRESSION PRESSURE 

    Check compression pressure. Refer to "CHECKING 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 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.

    • Fuel pump and circuit (Refer to "FUEL PUMP ".)
    • Fuel pressure regulator (Refer to "FUEL PRESSURE CHECK ".)
    • Fuel lines
    • Fuel filter for clogging

      Repair or replace.

  14. CHECK IGNITION TIMING 

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

    ITEMS SPECIFICATIONS CHART

    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 9: Identifying A/F Sensor 1 Harness Connector
      G04911564Courtesy 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 .

      CONTINUITY REFERENCE CHART

        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 .

      CONTINUITY REFERENCE CHART

      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.

    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-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 19.

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

  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 "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION ".

    GO TO 21.

  21. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    INSPECTION END 

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