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Home >> Lexus >> 2017 >> IS 300 F Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 125 (Engine Control System (4GR-FSE) - Diagnostic Codes (3 Of 5)) >> 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 [04/2013 - 08/2015] >> 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 [04/2013 - 08/2015]: Procedure

WARNING: This page is about a different car, the 2015 Lexus IS 250 and 2014 Lexus IS 250. 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 engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    5. Read the DTCs.

      Powertrain > Engine > Trouble Codes 

      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/or P0306 are output, troubleshoot those DTCs first.

    Result: 

    B 

    GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [04/2013 - 06/2014]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [06/2014 - 08/2015] 

    Result: 

    A 

    See step  2

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

      Refer to COMPONENTS [04/2013 - 08/2015]

      OK

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

      Result

      Proceed to
      OK
      NG

    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 engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Gas Misfire / Misfire RPM and Misfire Load.

      Powertrain > Engine > Data List 

      Tester Display
      Misfire RPM
      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

      Proceed to
      NEXT

    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 engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Gas Misfire / Catalyst OT MF F/C.

      Powertrain > Engine > Data List 

      Tester Display
      Catalyst OT MF F/C
    5. Read the value displayed on the Techstream.

      Result

      Data List Result 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 THE CATALYST OT MISFIRE PREVENT F/C) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Prohibit the Catalyst OT Misfire prevent F/C.

      Powertrain > Engine > Active Test 

      Tester Display
      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 the engine is either idling or being revved within 3000 rpm.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

  6. READ VALUE USING TECHSTREAM (CYLINDER MISFIRE COUNT) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Gas Misfire / Cylinder #1 Misfire Count, Cylinder #2 Misfire Count, Cylinder #3 Misfire Count, Cylinder #4 Misfire Count, Cylinder #5 Misfire Count and Cylinder #6 Misfire Count.

      Powertrain > Engine > Data List 

      Tester Display
      Cylinder #1 Misfire Count
      Cylinder #2 Misfire Count
      Cylinder #3 Misfire Count
      Cylinder #4 Misfire Count
      Cylinder #5 Misfire Count
      Cylinder #6 Misfire Count
    5. Start the engine and allow the engine to idle.
    6. 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 procedure [A] and [B] and then check the misfire counts again.
    7. Drive the vehicle with the Misfire RPM and Misfire Load noted in the "Read Value Using Techstream (Misfire RPM And Misfire Load)" procedures above [A].
    8. Read the Cylinder #1 Misfire Count to Cylinder #6 Misfire Count or DTCs displayed on the Techstream [B].

      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 record of the engine coolant temperature is less than 75°C (167°F), the misfire may be detected only when the engine is cold.
      • If the freeze frame data 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  16

    Result: 

    A 

    See step  7

  7. 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 [04/2013 - 08/2015]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SPARK PLUG. Refer to  REMOVAL [04/2013 - 08/2015] 

    Result: 

    OK 

    See step  8

  8. 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.
      • Perform "Inspection After Repair" after replacing the spark plug or ignition coil assembly.

        Refer to INITIALIZATION [04/2013 - 08/2015]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  9

  9. 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 [04/2013 - 08/2015]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION 

    Result: 

    OK 

    See step  10

  10. CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER 
    1. Check the fuel injector assembly injection (whether fuel volume is high or low, and whether injection pattern is poor).

      Refer to INSPECTION [04/2013 - 08/2015]

    2. Inspect the cold start fuel injector assembly.

      Refer to INSPECTION [04/2013 - 08/2015]

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel injector assembly or cold start fuel injector assembly.

      Refer to INITIALIZATION [04/2013 - 08/2015]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FUEL INJECTOR ASSEMBLY 

    Fuel Injector Assembly: Refer to REMOVAL [04/2013 - 08/2015]

    Cold Start Fuel Injector Assembly: Refer to REMOVAL [04/2013 - 08/2015]

    Result: 

    OK 

    See step  11

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

      Refer to ON-VEHICLE INSPECTION [04/2013 - 08/2015]

      OK

      No leaks from intake system.

      HINT: 

      Perform "Inspection After Repair" after repairing or replacing the intake system.

      Refer to INITIALIZATION [04/2013 - 08/2015]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE INTAKE SYSTEM 

    Result: 

    OK 

    See step  12

  12. CHECK FUEL PRESSURE 
    1. Check the fuel pressure for low pressure side.

      Refer to PROCEDURE - Step 2

    2. Check the fuel pressure for high pressure side.

      Refer to PROCEDURE - Step 3

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE FUEL SYSTEM 

    Result: 

    OK 

    See step  13

  13. READ VALUE USING TECHSTREAM (COOLANT TEMP) 

    Refer to PROCEDURE - Step 5

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to  REMOVAL [04/2013 - 08/2015] 

    Result: 

    OK 

    See step  14

  14. READ VALUE USING TECHSTREAM (MAF) 

    Refer to PROCEDURE - Step 6

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  25

    Result: 

    OK 

    See step  15

  15. CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH) 

    Refer to PROCEDURE - Step 4

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  25

    Result: 

    NG 

    ADJUST VALVE TIMING. Refer to  REASSEMBLY [04/2013 - 08/2015] 

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

      Refer to ON-VEHICLE INSPECTION [04/2013 - 08/2015]

      OK

      No leaks from intake system.

      HINT: 

      Perform "Inspection After Repair" after repairing or replacing the intake system.

      Refer to INITIALIZATION [04/2013 - 08/2015]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE INTAKE SYSTEM 

    Result: 

    OK 

    See step  17

  17. CHECK FUEL PRESSURE 
    1. Check the fuel pressure for low pressure side.

      Refer to PROCEDURE - Step 2

    2. Check the fuel pressure for high pressure side.

      Refer to PROCEDURE - Step 3

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE FUEL SYSTEM 

    Result: 

    OK 

    See step  18

  18. READ VALUE USING TECHSTREAM (COOLANT TEMP) 

    Refer to PROCEDURE - Step 5

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to  REMOVAL [04/2013 - 08/2015] 

    Result: 

    OK 

    See step  19

  19. READ VALUE USING TECHSTREAM (MAF) 

    Refer to PROCEDURE - Step 6

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  25

    Result: 

    OK 

    See step  20

  20. CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH) 

    Refer to PROCEDURE - Step 4

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    ADJUST VALVE TIMING. Refer to  REASSEMBLY [04/2013 - 08/2015] 

    Result: 

    OK 

    See step  21

  21. 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 [04/2013 - 08/2015]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SPARK PLUG. Refer to  REMOVAL [04/2013 - 08/2015] 

    Result: 

    OK 

    See step  22

  22. 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.
      • Perform "Inspection After Repair" after replacing the spark plug or ignition coil assembly.

        Refer to INITIALIZATION [04/2013 - 08/2015]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  23

  23. 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 [04/2013 - 08/2015]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION 

    Result: 

    OK 

    See step  24

  24. CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER 
    1. Check the fuel injector assembly injection (whether fuel volume is high or low, and whether injection pattern is poor).

      Refer to INSPECTION [04/2013 - 08/2015]

    2. Inspect the cold start fuel injector assembly.

      Refer to INSPECTION [04/2013 - 08/2015]

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel injector assembly or cold start fuel injector assembly.

      Refer to INITIALIZATION [04/2013 - 08/2015]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FUEL INJECTOR ASSEMBLY 

    Fuel Injector Assembly: Refer to REMOVAL [04/2013 - 08/2015]

    Cold Start Fuel Injector Assembly: Refer to REMOVAL [04/2013 - 08/2015]

    Result: 

    OK 

    See step  25

  25. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION) 
    1. Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM.

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [04/2013 - ]

      HINT: 

      Repair any problems.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  26

  26. CHECK WHETHER DTC OUTPUT RECURS (MISFIRE DTCS) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [04/2013 - 08/2015]

      Powertrain > Engine > Clear DTCs 

    5. Turn the engine switch off and wait for at least 30 seconds.
    6. Start the engine and warm it up.
    7. Turn the Techstream on.
    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.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    10. Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305 or P0306.
    11. Check the DTC judgment result.

      Result

      Result Proceed to
      ABNORMAL
      (DTC P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306 is output)      		 A
      NORMAL
      (DTCs are not output)      		 B

    Result: 

    B 

    END 

    Result: 

    A 

    See step  27

  27. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM) 

    Refer to PROCEDURE - Step 3 [04/2013 - 06/2014] , or refer to PROCEDURE - Step 3 [06/2014 - 08/2015]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  28

  28. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY 
    1. Replace the mass air flow meter sub-assembly.

      Refer to REMOVAL [04/2013 - 08/2015]

      HINT: 

      • If the results of the inspections performed in steps 14 and 19 indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly.
      • Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

        Refer to INITIALIZATION [04/2013 - 08/2015]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  29

  29. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [04/2013 - 08/2015]

      Powertrain > Engine > Clear DTCs 

    5. Turn the engine switch off and wait for at least 30 seconds.
    6. Start the engine and warm it up.
    7. Turn the Techstream on.
    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.

      Powertrain > Engine > Utility 

      Tester Display
      All Readiness
    10. Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305 or P0306.
    11. Check the DTC judgment result.

      Result

      Result Proceed to
      NORMAL
      (DTCs are not output)      		 A
      ABNORMAL
      (DTC P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306 is output)      		 B

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE ECM. Refer to  REMOVAL [04/2013 - 08/2015] 

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