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Home >> Lexus >> 2009 >> IS 250 RWD, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (DTCS P0010 - P0368) >> SFI System >> DTC P0300: Random / Multiple Cylinder Misfire Detected; DTC P0301: Cylinder 1 Misfire Detected; DTC P0302: Cylinder 2 Misfire Detected; DTC P0303: Cylinder 3 Misfire Detected; DTC P0304: Cylinder 4 Misfire Detected; DTC P0305: Cylinder 5 Misfire Detected; DTC P0306: Cylinder 6 Misfire Detected >> Procedure

DTC P0300: Random / Multiple Cylinder Misfire Detected; DTC P0301: Cylinder 1 Misfire Detected; DTC P0302: Cylinder 2 Misfire Detected; DTC P0303: Cylinder 3 Misfire Detected; DTC P0304: Cylinder 4 Misfire Detected; DTC P0305: Cylinder 5 Misfire Detected; DTC P0306: Cylinder 6 Misfire Detected: Procedure

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE CODES) 
    1. Connect Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the tester on.
    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    5. Read DTCs.

      HINT: 

      Write down the DTCs.

      Result

      Display (DTC Output) Proceed to
      P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306 A
      P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306 and other DTCs B

      HINT: 

      If any DTCs other than P0300, P0301, P0302, P0303, P0304, P0305 and P0306 are output, troubleshoot those DTCs first.

    B → See step   31 

    A: Go to next step 

  2. READ VALUE USING TECHSTREAM (MISFIRE RPM AND MISFIRE LOAD) 
    1. Connect Techstream to the DLC3.
    2. Turn the engine switch on (IG) and turn the tester on.
    3. Enter the following menus: Powertrain / Engine and ECT / Data List / Misfire / Misfire RPM and Misfire Load.
    4. Read and note the Misfire RPM and Misfire Load values.

      HINT: 

      The Misfire RPM and Misfire Load values indicate the vehicle conditions under which the misfire occurred.

    NEXT: Go to next step 

  3. CHECK PCV HOSE CONNECTIONS 

    OK

    PCV hose is correctly connected and is not damaged.

    NG → REPAIR OR REPLACE PCV HOSE 

    OK: Go to next step 

  4. READ VALUE USING TECHSTREAM 
    1. Connect Techstream to the DLC3.
    2. Turn the engine switch on (IG) and turn the tester on.
    3. Enter the following menus: Powertrain / Engine and ECT / Data List / Catalyst OT MF F/C.
    4. Read the value displayed on the tester.

      Result

      Data List Tester Display Proceed to
      Catalyst OT MF F/C Avail A
      Not Avl B

    B → See step   6 

    A: Go to next step 

  5. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect Techstream to the DLC3.
    2. Turn the engine switch on (IG) and turn the tester on.
    3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Prohibit the Catalyst OT Misfire prevent F/C.
    4. Perform the Active Test.
      NOTE:

      When performing the Active Test, make sure the vehicle is stopped and either idling or being revved within 3000 RPM.

    NEXT: Go to next step 

  6. READ VALUE USING TECHSTREAM 
    1. Enter the following menus: Powertrain / Engine and ECT / Data List / Misfire / Cylinder #1 Misfire Count, #2, #3, #4, #5 and #6
    2. Read each value for Cylinder #1 Misfire Count to #6 displayed on the tester. If no misfire counts occur in any cylinders, perform the following procedures:
      1. Start the engine and let it idle.
      2. Move the shift lever to the D position.
      3. Check the Cylinder #1 Misfire Count to #6.
      4. If misfire counts are still not displayed, perform steps (c) and (d).
    3. Drive the vehicle with the Misfire RPM and Misfire Load noted in the "READ VALUE OF TECHSTREAM Misfire RPM AND Misfire Load)" procedures above (Step c).
    4. Read the Cylinder #1 Misfire Count to #6 or DTCs displayed on the tester (Step d).

      Result

      Misfire Count Proceed to
      Most misfires occur in only 1 or 2 cylinders A
      3 cylinders or more have equal misfire counts B

      HINT: 

      • If it is difficult to reproduce misfires for each cylinder, check the Data List item called Misfire Margin. Try to find vehicle driving conditions that lower the Misfire Margin value. Values above 30% are considered normal.
      • If the freeze frame data's record of the engine coolant temperature is below 75°C (167°F), the misfire may be detected only when the engine is cold.
      • If the freeze frame data's record of the Engine Run Time is below 120 seconds, the misfire may be detected immediately after the engine is started.

    B → See step   18 

    A: Go to next step 

  7. CHECK SPARK PLUG 
    Fig 1: Measuring Spark Plug Electrode Gap
    GTY100198Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the ignition coil and the spark plug of the misfiring cylinder.
    2. Measure the spark plug electrode gap.

      Maximum gap

      1.0 mm and 1.1 mm (0.039 in. and 0.043 in.)

    3. Check the electrode for carbon deposits.
      RECOMMENDED SPARK PLUG

      Manufacturer Product
      DENSO FK20HBR11
      NGK ILFR6D11T
      NOTE:

      If the electrode gap is larger than standard, replace the spark plug. Do not adjust the electrode gap.

    NG → See step   32 

    OK: Go to next step 

  8. CHECK FOR SPARKS AND IGNITION 
    1. Disconnect the injector connectors to prevent the engine from starting.
      WARNING:

      Always disconnect all injector connectors.

      NOTE:

      Do not crank the engine for more than 2 seconds.

    2. Remove the ignition coil from the cylinder head.
    3. Install the spark plug onto the ignition coil.
    4. Attach the spark plug assembly to the cylinder head.
    5. Crank the engine for less than 2 seconds and check the spark.

      OK

      Sparks jump across electrode gap.

    6. Install the ignition coil.
    7. Reconnect the injector connectors.

    NG → See step   29 

    OK: Go to next step 

  9. CHECK CYLINDER COMPRESSION PRESSURE 
    1. Measure the cylinder compression pressure of the misfiring cylinder. Refer to ON-VEHICLE INSPECTION - Step 9 .

    NG → CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION 

    OK: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (ECM - EDU) 
    1. Disconnect the E5, E3 and E6 connectors.
      Fig 2: Identifying Connector Terminals
      GTY145582Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E26 injector driver (EDU) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Tester Connection Specified Condition
      #10 (E3-15) - #10 (E26-3) Below 1 Ω
      #20 (E5-17) - #20 (E26-2) Below 1 Ω
      #30 (E3-14) - #30 (E26-1) Below 1 Ω
      #40 (E5-16) - #40 (E26-12) Below 1 Ω
      #50 (E3-13) - #50 (E26-11) Below 1 Ω
      #60 (E5-15) - #60 (E26-10) Below 1 Ω
      INJF (E6-26) - INJF (E26-9) Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Specified Condition
      #10 (E3-15) or #10 (E26-3) - Body ground 10 kΩ or higher
      #20 (E5-17) or #20 (E26-2) - Body ground 10 kΩ or higher
      #30 (E3-14) or #30 (E26-1) - Body ground 10 kΩ or higher
      #40 (E5-16) or #40 (E26-12) - Body ground 10 kΩ or higher
      #50 (E3-13) or #50 (E26-11) - Body ground 10 kΩ or higher
      #60 (E5-15) or #60 (E26-10) - Body ground 10 kΩ or higher
      INJF (E6-26) or INJF (E26-9) - Body ground 10 kΩ or higher
    4. Reconnect the ECM connector.
    5. Reconnect the injector driver (EDU) connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  11. CHECK HARNESS AND CONNECTOR (EDU - FUEL INJECTOR) 
    1. Disconnect the H1 and I1 connectors.
      Fig 3: Identifying Connector Terminals
      GTY145581Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      IJ1+ (H1-2) - IJ1- (H1-5) 20°C (68°F) 2.01 to 2.31 Ω
      IJ2+ (I1-3) - IJ2- (I1-6) 20°C (68°F) 2.01 to 2.31 Ω
      IJ3+ (H1-3) - IJ3- (H1-6) 20°C (68°F) 2.01 to 2.31 Ω
      IJ4+ (I1-1) - IJ4- (I1-4) 20°C (68°F) 2.01 to 2.31 Ω
      IJ5+ (H1-1) - IJ5- (H1-4) 20°C (68°F) 2.01 to 2.31 Ω
      IJ6+ (I1-2) - IJ6- (I1-5) 20°C (68°F) 2.01 to 2.31 Ω
    3. Reconnect the injector driver (EDU) connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  12. CHECK FUEL INJECTOR OF MISFIRING CYLINDER 
    1. Check the injector resistance. Refer to INSPECTION .
    2. Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor). Refer to INSPECTION .

    NG → See step   33 

    OK: Go to next step 

  13. CHECK AIR INDUCTION SYSTEM 
    1. Check the air induction system for vacuum leakage. Refer to ON-VEHICLE INSPECTION .

      OK

      No leakage from air induction system.

    NG → REPAIR OR REPLACE AIR INDUCTION SYSTEM 

    OK: Go to next step 

  14. CHECK VALVE TIMING See step   4 

    NG → ADJUST VALVE TIMING 

    OK: Go to next step 

  15. CHECK FUEL PRESSURE 
    1. Check the fuel pressure for low pressure side. Refer to ON-VEHICLE INSPECTION - Step 2 .
    2. Check the fuel pressure for high pressure side. Refer to ON-VEHICLE INSPECTION - Step 3 .

    NG → CHECK AND REPLACE FUEL SYSTEM 

    OK: Go to next step 

  16. READ VALUE USING TECHSTREAM (COOLANT TEMP) See step   3 

    NG → See step   34 

    OK: Go to next step 

  17. INSPECT MASS AIR FLOW METER See step   6 

    NG → See step   35 

    OK → See step   36 

  18. CHECK AIR INDUCTION SYSTEM 
    1. Check the air induction system for vacuum leakage. Refer to ON-VEHICLE INSPECTION .

      OK

      No leakage from air induction system.

    NG → REPAIR OR REPLACE AIR INDUCTION SYSTEM 

    OK: Go to next step 

  19. CHECK VALVE TIMING See step   4 

    NG → ADJUST VALVE TIMING 

    OK: Go to next step 

  20. CHECK FUEL PRESSURE 
    1. Check the fuel pressure for low pressure side. Refer to ON-VEHICLE INSPECTION - Step 2 .
    2. Check the fuel pressure for high pressure side. Refer to ON-VEHICLE INSPECTION - Step 3 .

    NG → CHECK AND REPLACE FUEL SYSTEM 

    OK: Go to next step 

  21. READ VALUE USING TECHSTREAM (COOLANT TEMP) See step   3 

    NG → See step   34 

    OK: Go to next step 

  22. INSPECT MASS AIR FLOW METER See step   6 

    NG → See step   35 

    OK: Go to next step 

  23. CHECK SPARK PLUG 
    Fig 4: Measuring Spark Plug Electrode Gap
    GTY100198Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the ignition coil and the spark plug of the misfiring cylinder.
    2. Measure the spark plug electrode gap.

      Maximum gap

      1.0 mm and 1.1 mm (0.039 in. and 0.043 in.)

    3. Check the electrode for carbon deposits.
      RECOMMENDED SPARK PLUG

      Manufacturer Product
      DENSO FK20HBR11
      NGK ILFR6D11T
      NOTE:

      If the electrode gap is larger than standard, replace the spark plug. Do not adjust the electrode gap.

    NG → See step   32 

    OK: Go to next step 

  24. CHECK FOR SPARKS AND IGNITION 
    1. Disconnect the injector connectors to prevent the engine from starting.
      WARNING:

      Always disconnect all injector connectors.

      NOTE:

      Do not crank the engine for more than 2 seconds.

    2. Remove the ignition coil from the cylinder head.
    3. Install the spark plug onto the ignition coil.
    4. Attach the spark plug assembly to the cylinder head.
    5. Crank the engine for less than 2 seconds and check the spark.

      OK

      Sparks jump across electrode gap.

    6. Install the ignition coil.
    7. Reconnect the injector connectors.

    NG → See step   29 

    OK: Go to next step 

  25. CHECK CYLINDER COMPRESSION PRESSURE 
    1. Measure the cylinder compression pressure of the misfiring cylinder. Refer to ON-VEHICLE INSPECTION - Step 9 .

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  26. CHECK HARNESS AND CONNECTOR (ECM - EDU) 
    1. Disconnect the E5, E3 and E6 connectors.
      Fig 5: Identifying Connector Terminals
      GTY145582Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E26 injector driver (EDU) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Tester Connection Specified Condition
      #10 (E3-15) - #10 (E26-3) Below 1 Ω
      #20 (E5-17) - #20 (E26-2) Below 1 Ω
      #30 (E3-14) - #30 (E26-1) Below 1 Ω
      #40 (E5-16) - #40 (E26-12) Below 1 Ω
      #50 (E3-13) - #50 (E26-11) Below 1 Ω
      #60 (E5-15) - #60 (E26-10) Below 1 Ω
      INJF (E6-26) - INJF (E26-9) Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Specified Condition
      #10 (E3-15) or #10 (E26-3) - Body ground 10 kΩ or higher
      #20 (E5-17) or #20 (E26-2) - Body ground 10 kΩ or higher
      #30 (E3-14) or #30 (E26-1) - Body ground 10 kΩ or higher
      #40 (E5-16) or #40 (E26-12) - Body ground 10 kΩ or higher
      #50 (E3-13) or #50 (E26-11) - Body ground 10 kΩ or higher
      #60 (E5-15) or #60 (E26-10) - Body ground 10 kΩ or higher
      INJF (E6-26) or INJF (E26-9) - Body ground 10 kΩ or higher
    4. Reconnect the ECM connector.
    5. Reconnect the injector driver (EDU) connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  27. CHECK HARNESS AND CONNECTOR (EDU - FUEL INJECTOR) 
    1. Disconnect the H1 and I1 connectors.
      Fig 6: Identifying Connector Terminals
      GTY145581Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      IJ1+ (H1-2) - IJ1- (H1-5) 20°C (68°F) 2.01 to 2.31 Ω
      IJ2+ (I1-3) - IJ2- (I1-6) 20°C (68°F) 2.01 to 2.31 Ω
      IJ3+ (H1-3) - IJ3- (H1-6) 20°C (68°F) 2.01 to 2.31 Ω
      IJ4+ (I1-1) - IJ4- (I1-4) 20°C (68°F) 2.01 to 2.31 Ω
      IJ5+ (H1-1) - IJ5- (H1-4) 20°C (68°F) 2.01 to 2.31 Ω
      IJ6+ (I1-2) - IJ6- (I1-5) 20°C (68°F) 2.01 to 2.31 Ω
    3. Reconnect the injector driver (EDU) connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  28. CHECK FUEL INJECTOR OF MISFIRING CYLINDER 
    1. Check the injector resistance. Refer to INSPECTION .
    2. Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor). Refer to INSPECTION .

    NG → See step   33 

    OK → See step   36 

  29. CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER 
    1. Change the installed spark plug to a spark plug that functions normally.
    2. Perform a spark test.
      WARNING:

      Always disconnect all injector connectors.

      NOTE:

      Do not crank the engine for more than 2 seconds.

      1. Install the spark plug to the ignition coil and connect the ignition coil connector.
      2. Disconnect the injector connector.
      3. Ground the spark plug.
      4. Check if sparks occur while the engine is being cranked.

        OK

        Sparks jump across electrode gap.

    NG → See step   30 

    OK → See step   32 

  30. CHANGE TO NORMAL IGNITION COIL AND CHECK SPARK OF MISFIRING CYLINDER 

    NG → See step   36 

    OK → See step   37 

  31. GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  32. REPLACE SPARK PLUG. Refer to  REMOVAL 
  33. REPLACE FUEL INJECTOR ASSEMBLY. Refer to  REMOVAL 
  34. REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to  REMOVAL 
  35. REPLACE MASS AIR FLOW METER. Refer to  REMOVAL 
  36. REPLACE ECM. Refer to  REMOVAL 
  37. REPLACE IGNITION COIL. Refer to  REMOVAL 
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