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Home >> Lexus >> 2024 >> RC 350 Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 72 (Engine Control System (2GR-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 [09/2014 - 11/2017] >> 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 [09/2014 - 11/2017]: Procedure

WARNING: This page is about a different car, the 2017 Lexus RC 350, 2017 Lexus RC 300, 2016 Lexus RC 350, 2016 Lexus RC 300, and 2015 Lexus RC 350. 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 [09/2014 - 10/2015]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2015 - 08/2016]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2016 - 11/2017] 

    Result: 

    A 

    See step  2

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

      Refer to COMPONENTS [09/2014 - 11/2017]

      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. CHECK MISFIRE COUNT OF PORT INJECTION 
    1. Start the engine and warm it up.
    2. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Way / Port / Injection Way and Cylinder #1 Misfire Count to Cylinder #6 Misfire Count.

      Powertrain > Engine > Active Test 

      Active Test Display
      Control the Injection Way
      Data List Display
      Injection Way
      Cylinder #1 Misfire Count
      Cylinder #2 Misfire Count
      Cylinder #3 Misfire Count
      Cylinder #4 Misfire Count
      Cylinder #5 Misfire Count
      Cylinder #6 Misfire Count
    3. Allow the engine to idle.
    4. Read each value for Cylinder #1 Misfire Count to Cylinder #6 Misfire Count and Injection Way displayed on the Techstream. If no misfire counts occur in any cylinders, perform procedure [A] and [B] and then check the misfire counts again.
      1. 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].
      2. Read the Injection Way and Cylinder #1 Misfire Count to Cylinder #6 Misfire Count or DTCs displayed on the Techstream [B].

      Result

      Injection Way Misfire Count Proceed to
      Port 1 or 2 cylinders have misfire counts A
      3 cylinders or more have misfire counts
      There are no misfire counts B

    Result: 

    B 

    See step  10

    Result: 

    A 

    See step  7

  7. CHECK MISFIRE COUNT OF DIRECT INJECTION 
    1. Connect the Techstream to the DLC3.
    2. Start the engine and warm it up.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Way / Direct / Injection Way and Cylinder #1 Misfire Count to Cylinder #6 Misfire Count.

      Powertrain > Engine > Active Test 

      Active Test Display
      Control the Injection Way
      Data List Display
      Injection Way
      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. Allow the engine to idle.
    6. Read each value for Cylinder #1 Misfire Count to Cylinder #6 Misfire Count and Injection Way displayed on the Techstream. If no misfire counts occur in any cylinders, perform procedure [A] and [B] and then check the misfire counts again.
      1. 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].
      2. Read the Injection Way and Cylinder #1 Misfire Count to Cylinder #6 Misfire Count or DTCs displayed on the Techstream [B].

      Result

      Misfire Count Proceed to
      Port (Result of step 6) Direct
      1 or 2 cylinders have misfire counts 1 or 2 cylinders have misfire counts A
      3 cylinders or more have misfire counts 3 cylinders or more have misfire counts B
      1 or 2 cylinders have misfire counts There are no misfire counts C
      3 cylinders or more have misfire counts There are no misfire counts D

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel injector assembly (for port injection).

      Refer to INITIALIZATION [09/2014 - 11/2017]

    Result: 

    A 

    See step  12

    Result: 

    B 

    See step  15

    Result: 

    C 

    REPLACE FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION). Refer to  REMOVAL [09/2014 - 11/2017] 

    Result: 

    D 

    See step  8

  8. CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE) 
    1. Check the fuel pressure (for low pressure side).

      Refer to PROCEDURE - Step 2

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel injector assembly (for port injection).

      Refer to INITIALIZATION [09/2014 - 11/2017]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION (MISFIRING CYLINDER)). Refer to  REMOVAL [09/2014 - 11/2017] 

    Result: 

    NG 

    See step  9

  9. CHECK FURL PUMP OPERATION (FOR LOW PRESSURE SIDE) 
    1. Check the fuel pump operation (for low pressure side).

      Refer to PROCEDURE - Step 1

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel pump (for low pressure side).

      Refer to INITIALIZATION [09/2014 - 11/2017]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    CHECK AND REPLACE FUEL SYSTEM (PRESSURE REGULATOR, PIPE LINE AND FILTER) 

    Result: 

    NG 

    REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE). Refer to  REMOVAL [09/2014 - 11/2017] 

  10. CHECK MISFIRE COUNT OF DIRECT INJECTION 
    1. Connect the Techstream to the DLC3.
    2. Start the engine and warm it up.
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Way / Direct / Injection Way and Cylinder #1 Misfire Count to Cylinder #6 Misfire Count.

      Powertrain > Engine > Active Test 

      Active Test Display
      Control the Injection Way
      Data List Display
      Injection Way
      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. Allow the engine to idle.
    6. Read each value for Cylinder #1 Misfire Count to Cylinder #6 Misfire Count and Injection Way displayed on the Techstream. If no misfire counts occur in any cylinders, perform procedure [A] and [B] and then check the misfire counts again.
      1. 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].
      2. Read the Injection Way and Cylinder #1 Misfire Count to Cylinder #6 Misfire Count or DTCs displayed on the Techstream [B].

      Result

      Misfire Count Proceed to
      Port (Result of step 6) Direct
      There are no misfire counts There are misfire counts A
      There are no misfire counts There are no misfire counts B

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel injector assembly (for direct injection).

      Refer to INITIALIZATION [09/2014 - 11/2017]

    Result: 

    A 

    REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION (MISFIRING CYLINDER)). Refer to  REMOVAL [09/2014 - 11/2017] 

    Result: 

    B 

    See step  11

  11. CHECK MISFIRE COUNT 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG) and turn the Techstream on.
    3. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [09/2014 - 11/2017]

      Powertrain > Engine > Clear DTCs 

    4. Start the engine and warm it up.
    5. Enter the following menus: Powertrain / Engine and ECT / Data List / Misfire RPM, Misfire Load, Cylinder #1 to #6 Misfire Count and Injection Way.

      Powertrain > Engine > Data List 

      Tester Display
      Injection Way
      Cylinder #1 Misfire Count
      Cylinder #2 Misfire Count
      Cylinder #3 Misfire Count
      Cylinder #4 Misfire Count
      Cylinder #5 Misfire Count
      Cylinder #6 Misfire Count
      Misfire RPM
      Misfire Load
    6. Drive the vehicle with Misfire RPM and Misfire Load.
    7. Monitor all of the misfire count values or DTCs displayed on the Techstream.

      Result

      Misfire Count Injection Way Proceed to
      There are no misfire counts - A
      1 or 2 cylinders have misfire counts Port or Either B
      3 cylinders or more have misfire counts Port or Either C
      There are misfire counts Direct D

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel injector assembly (for direct injection).

      Refer to INITIALIZATION [09/2014 - 11/2017]

    Result: 

    A 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [09/2014 - 11/2017] 

    Result: 

    C 

    See step  15

    Result: 

    D 

    REPLACE FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION). Refer to  REMOVAL [09/2014 - 11/2017] 

    Result: 

    B 

    See step  12

  12. 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 [09/2014 - 11/2017]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE SPARK PLUG. Refer to  REMOVAL [09/2014 - 11/2017] 

    Result: 

    OK 

    See step  13

  13. 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 [09/2014 - 11/2017]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  14

  14. 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 [09/2014 - 11/2017]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [09/2014 - 11/2017] 

    Result: 

    NG 

    CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION 

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

      Refer to ON-VEHICLE INSPECTION [09/2014 - 10/2015] , or refer to ON-VEHICLE INSPECTION [10/2015 - 11/2017]

      OK

      No leaks from intake system.

      HINT: 

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

      Refer to INITIALIZATION [09/2014 - 11/2017]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE INTAKE SYSTEM 

    Result: 

    OK 

    See step  16

  16. READ VALUE USING TECHSTREAM (COOLANT TEMP) 

    Refer to PROCEDURE - Step 14

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to  REMOVAL [09/2014 - 11/2017] 

    Result: 

    OK 

    See step  17

  17. READ VALUE USING TECHSTREAM (MAF) 

    Refer to PROCEDURE - Step 15

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  21

    Result: 

    OK 

    See step  18

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

    Refer to PROCEDURE - Step 5

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  21

    Result: 

    NG 

    See step  19

  19. CHECK ENGINE MECHANICAL SYSTEM 
    1. Check for mechanical malfunctions that affect the valve timing, such as a jumped tooth or stretching of the timing chain.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

    Result: 

    OK 

    See step  20

  20. 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 [09/2014 - 11/2017]

      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: 

    A 

    See step  21

    Result: 

    B 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [09/2014 - 11/2017] 

  21. 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 [09/2014 - ]

      HINT: 

      Repair any problems.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  22

  22. 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 [09/2014 - 11/2017]

      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  23

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

    Refer to PROCEDURE - Step 3

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  24

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

      Refer to REMOVAL [09/2014 - 11/2017]

      HINT: 

      • If the results of the inspections performed in step 17 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 [09/2014 - 11/2017]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  25

  25. 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 [09/2014 - 11/2017]

      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 [09/2014 - 11/2017] 

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