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Home >> Toyota >> 2019 >> Sienna Limited, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Engine Control System [2GR-FE] - Diagnostic Codes (1 Of 3)) >> 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 [12/2015 - 08/2016] >> 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 [12/2015 - 08/2016]: Procedure

WARNING: This page is about a different car, the 2016 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE DTCS) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Trouble Codes.
    5. Read DTCs.
      RESULT

      Result Proceed to
      DTC P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306 are output A
      DTC P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306 and other DTCs are output B

      HINT: 

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

    Result: 

    B 

    GO TO DTC CHART 

    (Refer to DIAGNOSTIC TROUBLE CODE CHART [12/2015 - 08/2016] )

    Result: 

    A 

    See step  2

  2. CHECK PCV HOSE CONNECTIONS 
    1. Check the PCV hose connections (Refer to COMPONENTS [12/2015 - 08/2016] ).

      OK

      PCV valve and hose are connected correctly and are not damaged.

    Result: 

    NG 

    REPAIR OR REPLACE PCV HOSE 

    Result: 

    OK 

    See step  3

  3. READ VALUE USING TECHSTREAM (MISFIRE RPM AND MISFIRE LOAD) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Data List / Misfire RPM and Misfire Load.
    5. 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.

    Result: 

    NEXT 

    See step  4

  4. READ VALUE USING TECHSTREAM (CATALYST OT MF F/C) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Data List / Catalyst OT MF F/C.
    5. Read the value displayed on the Techstream.
      RESULT

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

    Result: 

    B 

    See step  6

    Result: 

    A 

    See step  5

  5. PERFORM ACTIVE TEST USING TECHSTREAM (PROHIBIT CAT OT F/C) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Active Test / Prohibit the Catalyst OT Misfire prevent F/C.
    5. 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.

    Result: 

    NEXT 

    See step  6

  6. READ VALUE USING TECHSTREAM (CYLINDER MISFIRE COUNT) 
    1. Enter the following menus: Powertrain / Engine / Data List / Cylinder #1 Misfire Count, Cylinder #2 Misfire Count, Cylinder #3 Misfire Count, #4 Misfire Count, #5 Misfire Count and Cylinder #6 Misfire Count.
    2. Start the engine and allow the engine to idle.
    3. Read each value for Cylinder #1 Misfire Count to Cylinder #6 Misfire Count displayed on the Techstream.

      If no misfire counts occur in any cylinders, perform steps (d) and (e) and then check the misfire counts again.

    4. Drive the vehicle with the Misfire RPM and Misfire Load noted in the "Read Value Using Techstream (Misfire RPM and Misfire Load)" procedures above.
    5. Read the Cylinder #1 Misfire Count to Cylinder #6 Misfire Count or DTCs displayed on the Techstream.
      RESULT

      Result 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 ECT 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.

    Result: 

    B 

    See step  17

    Result: 

    A 

    See step  7

  7. INSPECT SPARK PLUG 
    1. Inspect the spark plug of the misfiring cylinder (Refer to PROCEDURE - Step 2 ).

      HINT: 

      Perform "Inspection After Repair" after replacing the spark plug (Refer to INITIALIZATION [12/2015 - 08/2016] ).

    Result: 

    NG 

    REPLACE SPARK PLUG 

    (Refer to REMOVAL [12/2015 - 08/2016] )

    Result: 

    OK 

    See step  8

  8. CHECK FOR SPARKS AND IGNITION (SPARK TEST) 
    1. Disconnect the B7, B8, B9, B10, B11 and B12 fuel injector assembly connectors to prevent the engine from starting.
      WARNING:

      Always disconnect all the fuel injector assembly connectors.

    2. Remove the ignition coil assembly from the cylinder head.
    3. Perform a spark test (Refer to PROCEDURE - Step 1 ).

      HINT: 

      Perform "Inspection After Repair" after repairing or replacing the ignition system (Refer to INITIALIZATION [12/2015 - 08/2016] ).

    Result: 

    NG 

    See step  32

    Result: 

    OK 

    See step  9

  9. CHECK CYLINDER COMPRESSION PRESSURE 
    1. Measure the cylinder compression pressure of the misfiring cylinder (Refer to PROCEDURE - Step 11 ).

      HINT: 

      Perform "Inspection After Repair" after repairing or replacing the engine system (Refer to INITIALIZATION [12/2015 - 08/2016] ).

    Result: 

    NG 

    CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION 

    Result: 

    OK 

    See step  10

  10. CHECK ECM TERMINAL VOLTAGE (#10, #20, #30, #40, #50 AND /OR #60) 
    GTY710812Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the ECM connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      B1-86 (#10) - B1-43 (E01) Ignition switch ON 11 to 14 V
      B1-109 (#20) - B1-43 (E01) Ignition switch ON 11 to 14 V
      B1-85 (#30) - B1-43 (E01) Ignition switch ON 11 to 14 V
      B1-108 (#40) - B1-43 (E01) Ignition switch ON 11 to 14 V
      B1-84 (#50) - B1-43 (E01) Ignition switch ON 11 to 14 V
      B1-107 (#60) - B1-43 (E01) Ignition switch ON 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to ECM)

    Result: 

    NG 

    GO TO FUEL INJECTOR CIRCUIT 

    (Refer to Fuel Injector Circuit [12/2015 - 08/2016] )

    Result: 

    OK 

    See step  11

  11. CHECK FUEL INJECTOR OF MISFIRING CYLINDER 
    1. Check the fuel injector injection (whether fuel volume is high or low, and whether injection pattern is poor) (Refer to INSPECTION [12/2015 - 08/2016] ).

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel injector assembly (Refer to INITIALIZATION [12/2015 - 08/2016] ).

    Result: 

    NG 

    REPLACE FUEL INJECTOR ASSEMBLY 

    (Refer to REMOVAL [12/2015 - 08/2016] )

    Result: 

    OK 

    See step  12

  12. CHECK INTAKE SYSTEM 
    1. Check the intake system for vacuum leak.

      OK

      No leaks from intake system.

      HINT: 

      Perform "Inspection After Repair" after repairing or replacing the intake system (Refer to INITIALIZATION [12/2015 - 08/2016] ).

    Result: 

    NG 

    REPAIR OR REPLACE INTAKE SYSTEM 

    Result: 

    OK 

    See step  13

  13. CHECK FUEL PRESSURE 
    1. Check the fuel pressure (Refer to PROCEDURE - Step 2 ).

    Result: 

    NG 

    See step  34

    Result: 

    OK 

    See step  14

  14. READ VALUE USING TECHSTREAM (COOLANT TEMP) 

    See step  5

    Result: 

    NG 

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

    (Refer to REMOVAL [12/2015 - 08/2016] )

    Result: 

    OK 

    See step  15

  15. READ VALUE USING TECHSTREAM (MAF) 

    See step  6

    Result: 

    NG 

    See step  27

    Result: 

    OK 

    See step  16

  16. CHECK VALVE TIMING 

    See step  4

    Result: 

    OK 

    See step  27

    Result: 

    NG 

    CHECK ENGINE MECHANICAL SYSTEM 

    (Refer to PROCEDURE - Step 7 )

  17. CHECK INTAKE SYSTEM 
    1. Check the intake system for vacuum leaks.

      OK

      No leaks from intake system.

      HINT: 

      Perform "Inspection After Repair" after repairing or replacing the intake system (Refer to INITIALIZATION [12/2015 - 08/2016] ).

    Result: 

    NG 

    REPAIR OR REPLACE INTAKE SYSTEM 

    Result: 

    OK 

    See step  18

  18. CHECK FUEL PRESSURE 
    1. Check the fuel pressure (Refer to PROCEDURE - Step 2 ).

    Result: 

    NG 

    See step  34

    Result: 

    OK 

    See step  19

  19. READ VALUE USING TECHSTREAM (COOLANT TEMP) 

    See step  5

    Result: 

    NG 

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

    (Refer to REMOVAL [12/2015 - 08/2016] )

    Result: 

    OK 

    See step  20

  20. READ VALUE USING TECHSTREAM (MAF) 

    See step  6

    Result: 

    NG 

    See step  27

    Result: 

    OK 

    See step  21

  21. CHECK VALVE TIMING 

    See step  4

    Result: 

    NG 

    CHECK ENGINE MECHANICAL SYSTEM 

    (Refer to INSTALLATION [12/2015 - 08/2016] )

    Result: 

    OK 

    See step  22

  22. INSPECT SPARK PLUG 
    1. Remove the ignition coil assembly and the spark plug from the misfiring cylinder.
    2. Inspect the spark plug of the misfiring cylinder (Refer to PROCEDURE - Step 2 ).

      HINT: 

      Perform "Inspection After Repair" after replacing the spark plug (Refer to INITIALIZATION [12/2015 - 08/2016] ).

    Result: 

    NG 

    REPLACE SPARK PLUG 

    (Refer to REMOVAL [12/2015 - 08/2016] )

    Result: 

    OK 

    See step  23

  23. CHECK FOR SPARKS AND IGNITION (SPARK TEST) 
    1. Disconnect the B7, B8, B9, B10, B11 and B12 fuel injector assembly connectors to prevent the engine from starting.
      WARNING:

      Always disconnect all the fuel injector assembly connectors.

    2. Remove the ignition coil assembly from the cylinder head.
    3. Perform a spark test (Refer to PROCEDURE - Step 1 ).

      HINT: 

      Perform "Inspection After Repair" after repairing or replacing the intake system (Refer to INITIALIZATION [12/2015 - 08/2016] ).

    Result: 

    NG 

    See step  32

    Result: 

    OK 

    See step  24

  24. CHECK CYLINDER COMPRESSION PRESSURE 
    1. Measure the cylinder compression pressure of the misfiring cylinder (Refer to PROCEDURE - Step 11 ).

      HINT: 

      Perform "Inspection After Repair" after repairing or replacing the engine assembly (Refer to INITIALIZATION [12/2015 - 08/2016] ).

    Result: 

    NG 

    CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION 

    Result: 

    OK 

    See step  25

  25. INSPECT ECM TERMINAL VOLTAGE (#10, #20, #30, #40, #50 AND /OR #60) 
    GTY736242Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the ECM connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      B1-86 (#10) - B1-43 (E01) Ignition switch ON 11 to 14 V
      B1-109 (#20) - B1-43 (E01) Ignition switch ON 11 to 14 V
      B1-85 (#30) - B1-43 (E01) Ignition switch ON 11 to 14 V
      B1-108 (#40) - B1-43 (E01) Ignition switch ON 11 to 14 V
      B1-84 (#50) - B1-43 (E01) Ignition switch ON 11 to 14 V
      B1-107 (#60) - B1-43 (E01) Ignition switch ON 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to ECM)

    Result: 

    NG 

    GO TO FUEL INJECTOR CIRCUIT 

    (Refer to Fuel Injector Circuit [12/2015 - 08/2016] )

    Result: 

    OK 

    See step  26

  26. CHECK FUEL INJECTOR OF MISFIRING CYLINDER 
    1. Check the fuel injector injection (whether fuel volume is high or low, and whether injection pattern is poor) (Refer to INSPECTION [12/2015 - 08/2016] ).

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel injector assembly (Refer to INITIALIZATION [12/2015 - 08/2016] ).

    Result: 

    NG 

    REPLACE FUEL INJECTOR ASSEMBLY 

    (Refer to REMOVAL [12/2015 - 08/2016] )

    Result: 

    OK 

    See step  27

  27. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER CONNECTOR CONNECTION) 
    1. Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter and ECM (Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [12/2015 - ] ).

      HINT: 

      Repair any problems.

    Result: 

    NEXT 

    See step  28

  28. CHECK WHETHER DTC OUTPUT RECURS 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Clear DTCs (Refer to DTC CHECK / CLEAR [12/2015 - 08/2016] ).
    5. Turn the ignition switch off and wait for at least 30 seconds.
    6. Turn the ignition switch to ON.
    7. Turn the Techstream on.
    8. Start the engine.
    9. Warm up the engine.
    10. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
    12. Input the DTC: P0300, P0301, P0302, P0303, 0304, P0305 or P0306.
    13. Check the DTC judgment result.
      RESULT

      Result Proceed to
      ABNORMAL (P0300, P0301, P0302, P0303, 0304, P0305 or P0306 is output) A
      NORMAL (DTC is not output) B

    Result: 

    B 

    END 

    Result: 

    A 

    See step  29

  29. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 

    See step  6

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  30

  30. REPLACE MASS AIR FLOW METER 
    1. Replace the mass air flow meter (Refer to REMOVAL [12/2015 - 08/2016] ).

      HINT: 

      • If the results of the inspections performed in steps 15 and 20 indicated no problem, proceed to the next step without replacing the mass air flow meter.
      • Perform "Inspection After Repair" after replacing the mass air flow meter (Refer to INITIALIZATION [12/2015 - 08/2016] ).

    Result: 

    NEXT 

    See step  31

  31. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Clear DTCs (Refer to DTC CHECK / CLEAR [12/2015 - 08/2016] ).
    5. Turn the ignition switch off and wait for at least 30 seconds.
    6. Turn the ignition switch to ON.
    7. Turn the Techstream on.
    8. Start the engine.
    9. Warm up the engine.
    10. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
    12. Input the DTC: P0300, P0301, P0302, P0303, 0304, P0305 or P0306.
    13. Check the DTC judgment result.
      RESULT

      Result Proceed to
      NORMAL
      (DTC is not output)      		 A
      ABNORMAL
      (P0300, P0301, P0302, P0303, 0304, P0305 or P0306 is output)      		 B

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE ECM 

    (Refer to REMOVAL [12/2015 - 08/2016] )

  32. 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 (Refer to PROCEDURE - Step 1 ).
      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 assembly and connect the ignition coil assembly connector.
      2. Disconnect the fuel injector assembly connector.
      3. Ground the spark plug.
      4. Check if sparks occur while the engine is being cranked.

        OK

        Sparks jump across electrode gap.

        HINT: 

        Perform "Inspection After Repair" after replacing the spark plug (Refer to INITIALIZATION [12/2015 - 08/2016] ).

    Result: 

    OK 

    REPLACE SPARK PLUG 

    (Refer to REMOVAL [12/2015 - 08/2016] )

    Result: 

    NG 

    See step  33

  33. CHANGE TO NORMAL IGNITION COIL AND CHECK SPARK OF MISFIRING CYLINDER 
    1. Change the ignition coil assembly to an ignition coil assembly 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 assembly and connect the ignition coil assembly connector.
      2. Disconnect the B7, B8, B9, B10, B11 and B12 fuel injector assembly connectors.
      3. Ground the spark plug.
      4. Check if sparks occur while the engine is being cranked.

        OK

        Sparks jump across electrode gap.

        HINT: 

        Perform "Inspection After Repair" after replacing the ignition coil assembly (Refer to INITIALIZATION [12/2015 - 08/2016] ).

    Result: 

    OK 

    REPLACE IGNITION COIL ASSEMBLY 

    (Refer to REMOVAL [12/2015 - 08/2016] )

    Result: 

    NG 

    REPLACE ECM 

    (Refer to REMOVAL [12/2015 - 08/2016] )

  34. CHECK FUEL LINE 
    1. Check the fuel lines for leaks or blockage.

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel pump (Refer to INITIALIZATION [12/2015 - 08/2016] ).

    Result: 

    OK 

    REPLACE FUEL PUMP 

    (Refer to REMOVAL [12/2015 - 08/2016] )

    Result: 

    NG 

    REPAIR OR REPLACE FUEL LINE 

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