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Home >> Toyota >> 2019 >> Sequoia SR5, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (Engine Control System (3UR-FBE) - Diagnostic Codes (2 Of 6)) >> 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; DTC P0307: Cylinder 7 Misfire Detected; DTC P0308: Cylinder 8 Misfire Detected [08/2015 - 08/2017] >> 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; DTC P0307: Cylinder 7 Misfire Detected; DTC P0308: Cylinder 8 Misfire Detected [08/2015 - 08/2017]: Procedure

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  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE CODES) 
    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 and ECT / Trouble Codes.
    5. Read DTCs.
      RESULT

      Result Proceed to
      P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 are output A
      P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 and other DTCs are output B

      HINT: 

      If any DTCs other than P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and P0308 are output, troubleshoot those DTCs first.

    Result: 

    B 

    GO TO DTC CHART 

    Refer to:

    DIAGNOSTIC TROUBLE CODE CHART [08/2015 - 10/2016]

    DIAGNOSTIC TROUBLE CODE CHART [10/2016 - 08/2017]

    Result: 

    A 

    See step  2

  2. CHECK FREEZE FRAME DATA AND DATA LIST 
    1. Make a note of the freeze frame data "Short FT #1 or #2" and "Long FT #1 or #2" which were recorded the moment DTCs were stored.
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON.
    4. Turn the Techstream on.
    5. Enter the following menus: Powertrain / Engine and ECT / Data List / Short FT #1 or #2 and Long FT #1 or #2.
    6. Compare the air fuel ratio learned value (total of "Short FT #1" + "Long FT #1") in the freeze frame data with that in the Data List.
      RESULT

      Short FT + Long FT Proceed to
      Freeze Frame Data Data List
      -35% or less -35% or less A
      Higher than -35% Higher than -35%
      -35% or less Higher than -35% B

      HINT: 

      If only the freeze frame data indicates -35% or less, a misfire may have occurred in the past. Confirm the driving conditions with the customer (if the customer drove the vehicle in a way that can cause misfire, such as driving a short distance with a cold engine repeatedly). If the cause of misfire is due to driving conditions, clear the DTCs, check that there are no other malfunctions, and return the vehicle to the customer.

      Explain to the customer points to be careful about when driving a flexible fuel vehicle. (Refer to the Owner's Manual for details.)

    Result: 

    B 

    END 

    Result: 

    A 

    See step  3

  3. CHECK PCV HOSE CONNECTIONS 
    1. Check the PCV hose connections.

      OK

      PCV hose is connected correctly and is not damaged.

    Result: 

    NG 

    REPAIR OR REPLACE PCV HOSE 

    (Refer to REMOVAL [08/2015 - 08/2018] )

    Result: 

    OK 

    See step  4

  4. READ VALUE USING TECHSTREAM (MISFIRE RPM AND MISFIRE LOAD) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON and turn the Techstream 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.

    Result: 

    NEXT 

    See step  5

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

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

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  6

  6. PERFORM ACTIVE TEST USING TECHSTREAM (PROHIBIT THE CATALYST OT MISFIRE PREVENT F/C) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON and turn the Techstream on.
    3. Clear DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2018] ).
    4. Enter the following menus: Powertrain / Engine and ECT / 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  7

  7. READ VALUE USING TECHSTREAM (CYLINDER MISFIRE COUNT) 
    1. Enter the following menus: Powertrain / Engine and ECT / Data List / Misfire / Cylinder #1 Misfire Count, #2, #3, #4, #5, #6, #7 and #8.
    2. Allow the engine to idle.
    3. Read each value for Cylinder #1 Misfire Count to Cylinder #8 Misfire Count displayed on the Techstream. If no misfire counts occur in any cylinders, perform the following procedures:
      1. Move the shift lever to the D position.
      2. Check the Cylinder #1 Misfire Count to Cylinder #8 Misfire Count.
      3. If misfire counts are still not displayed, perform procedure "A" and "B" 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. (Procedure "A")
    5. Read the Cylinder #1 Misfire Count to Cylinder #8 Misfire Count or DTCs displayed on the Techstream. (Procedure "B")
      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 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  18

    Result: 

    A 

    See step  8

  8. INSPECT SPARK PLUG 
    1. Inspect the spark plug of the misfiring cylinder (Refer to PROCEDURE - Step 3 ).

      HINT: 

      Perform "Inspection After Repair" after replacing the spark plug (Refer to INITIALIZATION [08/2015 - 08/2017] ).

    Result: 

    NG 

    REPLACE SPARK PLUG 

    (Refer to REMOVAL [08/2015 - 08/2018] )

    Result: 

    OK 

    See step  9

  9. CHECK FOR SPARK (SPARK TEST) 
    1. Perform a spark test (Refer to PROCEDURE - Step 1 ).

      HINT: 

      If the result of the spark test is normal, proceed to the next step.

    Result: 

    NEXT 

    See step  10

  10. CHECK CYLINDER COMPRESSION PRESSURE 
    1. Measure the cylinder compression pressure of the misfiring cylinder (Refer to PROCEDURE - Step 10 ).

      HINT: 

      Perform "Inspection After Repair" after repairing or replacing the engine assembly (Refer to INITIALIZATION [08/2015 - 08/2017] ).

    Result: 

    NG 

    CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION 

    Result: 

    OK 

    See step  11

  11. INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30, #40, #50, #60, #70 AND/OR #80 VOLTAGE) 
    GTY587313Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the D56 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
      D56-86 (#10) - D56-43 (E01) Ignition switch ON 11 to 14 V
      D56-109 (#20) - D56-43 (E01) Ignition switch ON 11 to 14 V
      D56-85 (#30) - D56-43 (E01) Ignition switch ON 11 to 14 V
      D56-108 (#40) - D56-43 (E01) Ignition switch ON 11 to 14 V
      D56-84 (#50) - D56-43 (E01) Ignition switch ON 11 to 14 V
      D56-107 (#60) - D56-43 (E01) Ignition switch ON 11 to 14 V
      D56-83 (#70) - D56-43 (E01) Ignition switch ON 11 to 14 V
      D56-106 (#80) - D56-43 (E01) Ignition switch ON 11 to 14 V

    Result: 

    NG 

    GO TO FUEL INJECTOR CIRCUIT 

    (Refer to Fuel Injector Circuit [08/2015 - 08/2017] )

    Result: 

    OK 

    See step  12

  12. CHECK FUEL INJECTOR OF MISFIRING CYLINDER 
    1. Check the injector injection [whether fuel volume is high or low, and whether injection pattern is poor] (Refer to INSPECTION [08/2015 - 08/2018] ).

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel injector assembly (Refer to INITIALIZATION [08/2015 - 08/2017] ).

    Result: 

    NG 

    REPLACE FUEL INJECTOR 

    (Refer to REMOVAL [08/2015 - 08/2018] )

    Result: 

    OK 

    See step  13

  13. CHECK AIR INDUCTION SYSTEM 
    1. Check the air induction system for vacuum leakage (Refer to PROCEDURE - Step 4 ).

      OK

      No leakage from air induction system.

    Result: 

    NG 

    REPAIR OR REPLACE AIR INDUCTION SYSTEM 

    (Refer to REMOVAL [08/2015 - 08/2018] )

    Result: 

    OK 

    See step  14

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

    Result: 

    NG 

    See step  33

    Result: 

    OK 

    See step  15

  15. READ VALUE USING TECHSTREAM (COOLANT TEMP) 

    Refer to PROCEDURE - Step 4

    Result: 

    NG 

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

    (Refer to REMOVAL [08/2015 - 08/2018] )

    Result: 

    OK 

    See step  16

  16. READ VALUE USING TECHSTREAM (MAF) 
    1. Connect the Techstream to the DLC3.
    2. Start the engine.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / MAF and Coolant Temp.
    5. Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.
    6. Read MAF with the engine speed at 3000 RPM.

      Standard

      Between 18.0 gm/sec. and 27.0 gm/sec. (shift lever: N; A/C: Off).

    Result: 

    NG 

    See step  28

    Result: 

    OK 

    See step  17

  17. CHECK VALVE TIMING 

    Refer to PROCEDURE - Step 4

    Result: 

    OK 

    See step  28

    Result: 

    NG 

    CHECK ENGINE MECHANICAL SYSTEM 

    (Refer to INSPECTION [08/2015 - 08/2018] )

  18. CHECK AIR INDUCTION SYSTEM 
    1. Check the air induction system for vacuum leakage (Refer to PROCEDURE - Step 4 ).

      OK

      No leakage from air induction system.

      HINT: 

      Perform "Inspection After Repair" after repairing or replacing the air induction system (Refer to INITIALIZATION [08/2015 - 08/2017] ).

    Result: 

    NG 

    REPAIR OR REPLACE AIR INDUCTION SYSTEM 

    (Refer to REMOVAL [08/2015 - 08/2018] )

    Result: 

    OK 

    See step  19

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

    Result: 

    NG 

    See step  33

    Result: 

    OK 

    See step  20

  20. READ VALUE USING TECHSTREAM (COOLANT TEMP) 

    Refer to PROCEDURE - Step 4

    Result: 

    NG 

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

    (Refer to REMOVAL [08/2015 - 08/2018] )

    Result: 

    OK 

    See step  21

  21. READ VALUE USING TECHSTREAM (MAF) 
    1. Connect the Techstream to the DLC3.
    2. Start the engine.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / MAF and Coolant Temp.
    5. Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.
    6. Read MAF with the engine speed at 3000 RPM.

      Standard

      Between 18.0 gm/sec. and 27.0 gm/sec. (shift lever: N; A/C: Off).

    Result: 

    NG 

    See step  28

    Result: 

    OK 

    See step  22

  22. CHECK VALVE TIMING 

    Refer to PROCEDURE - Step 4

    Result: 

    NG 

    CHECK ENGINE MECHANICAL SYSTEM 

    (Refer to INSPECTION [08/2015 - 08/2018] )

    Result: 

    OK 

    See step  23

  23. INSPECT SPARK PLUG 
    1. Inspect the spark plug of the misfiring cylinder (Refer to PROCEDURE - Step 3 ).

      HINT: 

      Perform "Inspection After Repair" after replacing the spark plug (Refer to INITIALIZATION [08/2015 - 08/2017] ).

    Result: 

    NG 

    REPLACE SPARK PLUG 

    (Refer to REMOVAL [08/2015 - 08/2018] )

    Result: 

    OK 

    See step  24

  24. CHECK FOR SPARK (SPARK TEST) 
    1. Perform a spark test (Refer to PROCEDURE - Step 1 ).

      HINT: 

      If the result of the spark test is normal, proceed to the next step.

    Result: 

    NEXT 

    See step  25

  25. CHECK CYLINDER COMPRESSION PRESSURE 
    1. Measure the cylinder compression pressure of the misfiring cylinder (Refer to PROCEDURE - Step 10 ).

      HINT: 

      Perform "Inspection After Repair" after repairing or replacing the engine assembly (Refer to INITIALIZATION [08/2015 - 08/2017] ).

    Result: 

    NG 

    CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION 

    Result: 

    OK 

    See step  26

  26. INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30, #40, #50, #60, #70 AND/OR #80 VOLTAGE) 
    GTY587313Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the D56 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
      D56-86 (#10) - D56-43 (E01) Ignition switch ON 11 to 14 V
      D56-109 (#20) - D56-43 (E01) Ignition switch ON 11 to 14 V
      D56-85 (#30) - D56-43 (E01) Ignition switch ON 11 to 14 V
      D56-108 (#40) - D56-43 (E01) Ignition switch ON 11 to 14 V
      D56-84 (#50) - D56-43 (E01) Ignition switch ON 11 to 14 V
      D56-107 (#60) - D56-43 (E01) Ignition switch ON 11 to 14 V
      D56-83 (#70) - D56-43 (E01) Ignition switch ON 11 to 14 V
      D56-106 (#80) - D56-43 (E01) Ignition switch ON 11 to 14 V

    Result: 

    NG 

    GO TO FUEL INJECTOR CIRCUIT 

    (Refer to Fuel Injector Circuit [08/2015 - 08/2017] )

    Result: 

    OK 

    See step  27

  27. CHECK FUEL INJECTOR OF MISFIRING CYLINDER 
    1. Check the injector injection [whether fuel volume is high or low, and whether injection pattern is poor] (Refer to INSPECTION [08/2015 - 08/2018] ).

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel injector assembly (Refer to INITIALIZATION [08/2015 - 08/2017] ).

    Result: 

    NG 

    REPLACE FUEL INJECTOR 

    (Refer to REMOVAL [08/2015 - 08/2018] )

    Result: 

    OK 

    See step  28

  28. CHECK HARNESS AND CONNECTOR 
    1. Check the connection and terminal contact pressure of the connectors and wire harnesses between the mass air flow meter and ECM (Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [08/2015 - 08/2019] ).

      HINT: 

      Repair any problems.

    Result: 

    NEXT 

    See step  29

  29. CHECK WHETHER DTC OUTPUT RECURS (MISFIRE DTCS) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2018] ).
    5. Turn the ignition switch off.
    6. Turn the ignition switch to ON and turn the Techstream on.
    7. Start the engine and warm it up.
    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
    10. Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308.
    11. Check the DTC judgment result.
      RESULT

      Display (DTC Output) Proceed to
      ABNORMAL
      (P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308 output)      		 A
      NORMAL
      (No DTC output)      		 B

    Result: 

    B 

    END 

    Result: 

    A 

    See step  30

  30. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) 
    1. Disconnect the D3 MAF meter connector.
    2. Disconnect the D56 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      D3-3 (VG) - D56-74 (VG) Always Below 1 Ω
      D3-2 (E2G) - D56-75 (E2G) Always Below 1 Ω
      D3-3 (VG) or D56-74 (VG) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  31

  31. REPLACE MASS AIR FLOW METER 
    1. Replace the mass air flow meter (Refer to REMOVAL [08/2015 - 08/2018] ).

      HINT: 

      • If the results of the inspections performed in steps 16 and 21 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 [08/2015 - 08/2017] ).

    Result: 

    NEXT 

    See step  32

  32. 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 the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2018] ).
    5. Turn the ignition switch off.
    6. Turn the ignition switch to ON and turn the Techstream on.
    7. Start the engine and warm it up.
    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
    9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
    10. Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308.
    11. Check the DTC judgment result.
      RESULT

      Display (DTC Output) Proceed to
      NORMAL
      (No DTC output)      		 A
      ABNORMAL
      (P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308 output)      		 B

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE ECM 

    (Refer to REMOVAL [08/2015 - 08/2018] )

  33. 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 [08/2015 - 08/2017] ).

    Result: 

    OK 

    REPLACE FUEL PUMP 

    Refer to:

    REMOVAL [08/2015 - 10/2016]

    REMOVAL [10/2016 - 08/2018]

    Result: 

    NG 

    REPAIR OR REPLACE FUEL LINE 

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