SFI SYSTEM, Diagnostic DTC:P0300, P0301, P0302, P0303, P0304, P0305, P0306

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

DESCRIPTION

When the engine misfires, high concentrations of hydrocarbons enter the exhaust gas. High hydrocarbons concentration levels can cause increase in exhaust emission levels. Extremely high concentrations of hydrocarbons can also cause increases in the three-way catalytic converter temperature, which may cause damage to the three-way catalytic converter. To prevent this increase in emissions and to limit the possibility of thermal damage, the ECM monitors the misfire rate. When the temperature of the three-way catalytic converter reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the VVT sensor and the crankshaft position sensor. The VVT sensor is used to identify any misfiring cylinders and the crankshaft position sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted when the crankshaft rotation speed variations exceed predetermined thresholds. If the misfire count exceeds the threshold levels, the ECM illuminates the MIL and sets a DTC.

DTC No. DTC Detection Condition Trouble Area
P0300

Simultaneous misfiring of several cylinders occurs and one of following conditions below is detected (2 trip detection logic):


  • High temperature misfire occurs in three-way catalytic converter (MIL blinks)

  • Emission deterioration misfire occurs (MIL illuminates)

  • Open or short in engine wire harness

  • Connector connection

  • Vacuum hose connections

  • Ignition system

  • Fuel injector assembly

  • Fuel pressure

  • Mass air flow meter sub-assembly

  • Engine coolant temperature sensor

  • Compression pressure

  • Valve timing

  • PCV valve and hose

  • PCV hose connections

  • Air induction system

  • ECM

P0301

P0302

P0303

P0304

P0305

P0306

Misfiring of specific cylinder occurs and one of following conditions below is detected (2 trip detection logic):


  • High temperature misfire occurs in three-way catalytic converter (MIL blinks)

  • Emission deterioration misfire occurs (MIL illuminates)

When multiple DTCs for misfiring cylinders are set, but DTC P0300 is not set, it indicates that misfires have been detected in different cylinders at different times. DTC P0300 is only set when several misfiring cylinders are detected at the same time.

WIRING DIAGRAM

Refer to DTC P0102 Click here.

Refer to Fuel Injector Circuit Click here.

CONFIRMATION DRIVING PATTERN


  1. Connect the intelligent tester to the DLC3.

  2. Turn the ignition switch on (IG).

  3. Turn the tester on.

  4. Record the DTC(s) and freeze frame data.

  5. Clear DTCs.

  6. Using the tester, switch the ECM from normal mode to check mode Click here.

  7. Read the misfire counts of each cylinder (cylinder No. 1 to No. 6) with the engine idling. If any misfire count is displayed, skip the following confirmation driving pattern.

  8. Drive the vehicle several times with the conditions, such as engine speed and engine load, as shown in Misfire RPM and Misfire Load in the freeze frame data.

    Tech Tips

    In order to store misfire DTCs, it is necessary to operate the vehicle for the period of time shown in the table below with the engine speed and engine load the same as Misfire RPM and Misfire Load in the freeze frame data.

    Engine Speed Duration
    Idling 7.0 minutes or more
    1000 4.0 minutes or more
    2000 2.0 minutes or more
    3000 1.5 minutes or more

  9. Check whether misfires have occurred by checking DTCs and freeze frame data.

    Tech Tips

    Do not turn the ignition switch off until the stored DTCs and freeze frame data have been recorded. When the ECM returns to normal mode (default), the stored DTCs, freeze frame data and other data will be cleared.

  10. Record the DTCs, freeze frame data and misfire counts.

  11. Turn the ignition switch off and wait for at least 30 seconds.

  12. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips


  • If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.

  • Bank 1 refers to the bank that includes the No. 1 cylinder*.

    *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

  • Bank 2 refers to the bank that does not include the No. 1 cylinder.

  • Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

  • If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored in the ECM as freeze frame data.

  • If the misfire still cannot be reproduced even though the conditions stored in the ECM as freeze frame data have been reproduced, one of the following factors is considered to be a possible cause of the problem:


    1. There was insufficient fuel volume in the tank.

    2. Improper fuel is used.

    3. The spark plugs have been contaminated.

  • After finishing repairs, check the misfire counts of the cylinders (Cylinder #1 Misfire Count to Cylinder #6 Misfire Count).

  • Be sure to confirm that no misfiring cylinder DTCs are set again by conducting the confirmation driving pattern after finishing repairs.

  • For 6 and 8 cylinder engines, the ECM intentionally does not set the specific misfiring cylinder DTCs at high engine speed. If misfires occur only in high engine speed areas, only DTC P0300 is set.

    In the event of DTC P0300 being present, perform the following operations:


    1. Clear the DTC Click here.

    2. Start the engine and conduct the confirmation driving pattern.

    3. Read the misfiring counts of each cylinder or DTC(s) using the tester.

    4. Repair the cylinder(s) that has a high misfiring count or is indicated by the DTC.

    5. After finishing repairs, conduct the confirmation driving pattern again, in order to verify that DTC P0300 is not set.

  • When one of Short FT #1, Long FT #1, Short FT #2 or Long FT #2 in the freeze frame data is outside the range of +/-20%, the air fuel ratio may be Rich (-20% or less) or Lean (+20% or more).

  • When the Coolant Temp in the freeze frame data is less than 75°C (167°F), the misfire have occurred only while warming up the engine.

  • An extremely imbalanced drive wheel which causes body vibration may cause misfire DTCs detection.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE CODES)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / DTC.

    5. Read DTCs.

      Tech Tips

      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

      Tech Tips

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


    B

    GO TO DTC CHART Click here

    A

  2. CHECK PCV HOSE CONNECTIONS


    1. Check the PCV hose connection.

      OK
      PCV hose is correctly connected and is not damaged.

    NG

    REPAIR OR REPLACE PCV HOSE

    OK

  3. READ VALUE USING INTELLIGENT TESTER (MISFIRE RPM AND MISFIRE LOAD)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG) and turn the tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Misfire RPM and Misfire Load.

    4. Read and note the Misfire RPM and Misfire Load values.

      Tech Tips

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


    NEXT

  4. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Catalyst OT MF F/C.

    5. Read the value displayed on the tester.

      Result
      Data List Tester Display Proceed to
      Catalyst OT MF F/C AVAIL (Avail) A
      NOT AVL (Not Avl) B

    B

    READ VALUE USING INTELLIGENT TESTER (MISFIRE COUNT) Click here

    A

  5. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Prohibit 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 at 3000 rpm or less.


    NEXT

  6. READ VALUE USING INTELLIGENT TESTER (MISFIRE COUNT)


    1. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / 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 USING INTELLIGENT TESTER (MISFIRE RPM AND MISFIRE LOAD)" procedures above.

    4. Read the Cylinder #1 Misfire Count to #6 or DTCs displayed on the tester.

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

      Tech Tips


      • 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

    CHECK AIR INDUCTION SYSTEM Click here

    A

  7. CHECK SPARK PLUG


    1. Inspect the spark plug Click here.


    NG

    REPLACE SPARK PLUG Click here

    OK

  8. CHECK FOR SPARKS AND IGNITION


    1. Disconnect the fuel injector assembly connectors to prevent the engine from starting.

      CAUTION:

      Always disconnect all fuel injector assembly connectors.

      Note

      Do not crank the engine for more than 2 seconds.

    2. Remove the ignition coil assembly from the cylinder head.

    3. Install the spark plug onto the ignition coil assembly.

    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 assembly.

    7. Reconnect the fuel injector assembly connectors.


    NG

    CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER Click here

    OK

  9. CHECK CYLINDER COMPRESSION PRESSURE


    1. Measure the cylinder compression pressure of the misfiring cylinder Click here.


    NG

    CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

    OK

  10. CHECK HARNESS AND CONNECTOR (INJECTOR OF MISFIRING CYLINDER POWER SOURCE)


    1. A017FMUE65
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Fuel Injector Assembly)

      Disconnect the fuel injector assembly connector (of the misfiring cylinder).

    2. Turn the ignition switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Cylinder Tester Connection Switch Condition Specified Condition
      No. 1 B13-2 - Body ground Ignition switch on (IG) 11 to 14 V
      No. 2 B14-2 - Body ground Ignition switch on (IG) 11 to 14 V
      No. 3 B15-2 - Body ground Ignition switch on (IG) 11 to 14 V
      No. 4 B16-2 - Body ground Ignition switch on (IG) 11 to 14 V
      No. 5 B17-2 - Body ground Ignition switch on (IG) 11 to 14 V
      No. 6 B18-2 - Body ground Ignition switch on (IG) 11 to 14 V

    4. Turn the ignition switch off.

    5. Reconnect the fuel injector assembly connector.


    NG

    GO TO FUEL INJECTOR CIRCUIT Click here

    OK

  11. CHECK HARNESS AND CONNECTOR (ECM - FUEL INJECTOR ASSEMBLY OF MISFIRING)


    1. Disconnect the fuel injector assembly connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Check for open
      Cylinder Tester Connection Condition Specified Condition
      No. 1 B13-1 - B47-6 (#10) Always Below 1 Ω
      No. 2 B14-1 - B47-1 (#20) Always Below 1 Ω
      No. 3 B15-1 - B47-7 (#30) Always Below 1 Ω
      No. 4 B16-1 - B47-2 (#40) Always Below 1 Ω
      No. 5 B17-1 - B47-8 (#50) Always Below 1 Ω
      No. 6 B18-1 - B47-3 (#60) Always Below 1 Ω
      Check for short
      Cylinder Tester Connection Condition Specified Condition
      No. 1 B13-1 or B47-6 (#10) - Body ground Always 10 kΩ or higher
      No. 2 B14-1 or B47-1 (#20) - Body ground Always 10 kΩ or higher
      No. 3 B15-1 or B47-7 (#30) - Body ground Always 10 kΩ or higher
      No. 4 B16-1 or B47-2 (#40) - Body ground Always 10 kΩ or higher
      No. 5 B17-1 or B47-8 (#50) - Body ground Always 10 kΩ or higher
      No. 6 B18-1 or B47-3 (#60) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the fuel injector assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

    OK

  12. CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER


    1. Check the fuel injector assembly resistance Click here.

    2. Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor) Click here.


    NG

    REPLACE FUEL INJECTOR ASSEMBLY Click here

    OK

  13. CHECK AIR INDUCTION SYSTEM


    1. Check the air induction system for vacuum leakage Click here.

      OK
      No leakage from air induction system.

    NG

    REPAIR OR REPLACE AIR INDUCTION SYSTEM

    OK

  14. CHECK FUEL PRESSURE


    1. Check the fuel pressure Click here.


    NG

    CHECK FUEL LINE Click here

    OK

  15. READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.

    5. Read the Data List twice, when the engine is both cold and warmed up.

      Standard value
      With cold engine: Same as ambient air temperature.
      With warm engine: 80 to 100°C (176 to 212°F).

    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    OK

  16. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Turn the tester 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 2500 rpm.

      Standard
      Between 8 g/sec. and 19 g/sec. (shift lever: N; A/C: off).

    NG

    CHECK HARNESS AND CONNECTOR Click here

    OK

  17. CHECK VALVE TIMING


    1. A017F6CE04
      Text in Illustration
      *1 Timing Mark

      Remove the cylinder head covers RH and LH.

    2. Turn the crankshaft to align the timing marks of the crankshaft.

    3. Align the notch of the crankshaft pulley to the "0" position.

    4. Check if the timing marks of the camshaft pulley and camshaft bearing cap align.

    5. Turn the crankshaft clockwise by 360° if the timing marks do not align. Check if they align once again.

      OK
      The timing marks of the camshaft pulley and the camshaft bearing cap align when the notch of the crankshaft pulley is in the "0" position.

    OK

    CHECK HARNESS AND CONNECTOR Click here

    NG

    ADJUST VALVE TIMING Click here

  18. CHECK AIR INDUCTION SYSTEM


    1. Check the air induction system for vacuum leakage Click here.

      OK
      No leakage from air induction system.

    NG

    REPAIR OR REPLACE AIR INDUCTION SYSTEM

    OK

  19. CHECK FUEL PRESSURE


    1. Check the fuel pressure Click here.


    NG

    CHECK FUEL LINE Click here

    OK

  20. READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.

    5. Read the Data List twice, when the engine is both cold and warmed up.

      Standard value
      With cold engine: Same as ambient air temperature.
      With warm engine: 80 to 100°C (176 to 212°F).

    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    OK

  21. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Turn the tester 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 2500 rpm.

      Standard
      Between 8 g/sec. and 19 g/sec. (shift lever: N; A/C: off).

    NG

    CHECK HARNESS AND CONNECTOR Click here

    OK

  22. CHECK VALVE TIMING


    1. A017F6CE04
      Text in Illustration
      *1 Timing Mark

      Remove the cylinder head covers RH and LH.

    2. Turn the crankshaft to align the timing marks of the crankshaft.

    3. Align the notch of the crankshaft pulley to the "0" position.

    4. Check if the timing marks of the camshaft pulley and camshaft bearing cap align.

    5. Turn the crankshaft clockwise by 360° if the timing marks do not align. Check if they align once again.

      OK
      The timing marks of the camshaft pulley and the camshaft bearing cap align when the notch of the crankshaft pulley is in the "0" position.

    NG

    ADJUST VALVE TIMING Click here

    OK

  23. CHECK SPARK PLUG


    1. Inspect the spark plug Click here.


    NG

    REPLACE SPARK PLUG Click here

    OK

  24. CHECK FOR SPARKS AND IGNITION


    1. Disconnect the fuel injector assembly connectors to prevent the engine from starting.

      CAUTION:

      Always disconnect all fuel injector assembly connectors.

      Note

      Do not crank the engine for more than 2 seconds.

    2. Remove the ignition coil assembly from the cylinder head.

    3. Install the spark plug onto the ignition coil assembly.

    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 assembly.

    7. Reconnect the fuel injector assembly connectors.


    NG

    CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER Click here

    OK

  25. CHECK CYLINDER COMPRESSION PRESSURE


    1. Measure the cylinder compression pressure of the misfiring cylinder Click here.


    NG

    CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

    OK

  26. CHECK HARNESS AND CONNECTOR (INJECTOR OF MISFIRING CYLINDER POWER SOURCE)


    1. A017FMUE65
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Fuel Injector Assembly)

      Disconnect the fuel injector assembly connector (of the misfiring cylinder).

    2. Turn the ignition switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Cylinder Tester Connection Switch Condition Specified Condition
      No. 1 B13-2 - Body ground Ignition switch on (IG) 11 to 14 V
      No. 2 B14-2 - Body ground Ignition switch on (IG) 11 to 14 V
      No. 3 B15-2 - Body ground Ignition switch on (IG) 11 to 14 V
      No. 4 B16-2 - Body ground Ignition switch on (IG) 11 to 14 V
      No. 5 B17-2 - Body ground Ignition switch on (IG) 11 to 14 V
      No. 6 B18-2 - Body ground Ignition switch on (IG) 11 to 14 V

    4. Turn the ignition switch off.

    5. Reconnect the fuel injector assembly connector.


    NG

    GO TO FUEL INJECTOR CIRCUIT Click here

    OK

  27. CHECK HARNESS AND CONNECTOR (ECM - FUEL INJECTOR ASSEMBLY OF MISFIRING)


    1. Disconnect the fuel injector assembly connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Check for open
      Cylinder Tester Connection Condition Specified Condition
      No. 1 B13-1 - B47-6 (#10) Always Below 1 Ω
      No. 2 B14-1 - B47-1 (#20) Always Below 1 Ω
      No. 3 B15-1 - B47-7 (#30) Always Below 1 Ω
      No. 4 B16-1 - B47-2 (#40) Always Below 1 Ω
      No. 5 B17-1 - B47-8 (#50) Always Below 1 Ω
      No. 6 B18-1 - B47-3 (#60) Always Below 1 Ω
      Check for short
      Cylinder Tester Connection Condition Specified Condition
      No. 1 B13-1 or B47-6 (#10) - Body ground Always 10 kΩ or higher
      No. 2 B14-1 or B47-1 (#20) - Body ground Always 10 kΩ or higher
      No. 3 B15-1 or B47-7 (#30) - Body ground Always 10 kΩ or higher
      No. 4 B16-1 or B47-2 (#40) - Body ground Always 10 kΩ or higher
      No. 5 B17-1 or B47-8 (#50) - Body ground Always 10 kΩ or higher
      No. 6 B18-1 or B47-3 (#60) - Body ground Always 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the fuel injector assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

    OK

  28. CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER


    1. Check the fuel injector assembly resistance Click here.

    2. Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor) Click here.


    NG

    REPLACE FUEL INJECTOR ASSEMBLY Click here

    OK

  29. CHECK HARNESS AND CONNECTOR


    1. Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM Click here.

      Tech Tips

      Repair any problems.


    NEXT

  30. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Turn the tester on.

    4. Clear the DTCs Click here.

    5. Turn the ignition switch off.

    6. Turn the ignition switch on (IG) and turn the tester 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 or P0306.

    11. Check the DTC judgment result.

      Result
      Display (DTC Output) Proceed to

      ABNORMAL

      (P0300, P0301, P0302, P0303, P0304, P0305 or P0306 output)

      		 A

      NORMAL

      (No DTC output)

      		 B

    B

    END

    A

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


    1. Disconnect the mass air flow meter sub-assembly connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      B10-5 (VG) - B49-14 (VG) Always Below 1 Ω
      B10-4 (E2G) - B49-13 (E2G) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B10-5 (VG) or B49-14 (VG) - Body ground Always 10 kΩ or higher

    4. Reconnect the mass air flow meter sub-assembly connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  32. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY


    1. Replace the mass air flow meter sub-assembly Click here.

      Tech Tips

      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.


    NEXT

  33. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Turn the tester on.

    4. Clear the DTCs Click here.

    5. Turn the ignition switch off.

    6. Turn the ignition switch on (IG) and turn the tester 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 or P0306.

    11. Check the DTC judgment result.

      Result
      Display (DTC Output) Proceed to

      NORMAL

      (No DTC output)

      		 A

      ABNORMAL

      (P0300, P0301, P0302, P0303, P0304, P0305 or P0306 output)

      		 B

    B

    REPLACE ECM Click here

    A

    END

  34. 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.

      CAUTION:

      Always disconnect all fuel injector assembly 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 connectors.

      3. Ground the spark plug.

      4. Check if sparks occur while the engine is being cranked.

        OK
        Sparks jump across electrode gap.

    NG

    CHANGE TO NORMAL IGNITION COIL ASSEMBLY AND CHECK SPARK OF MISFIRING CYLINDER Click here

    OK

    REPLACE SPARK PLUG Click here

  35. CHANGE TO NORMAL IGNITION COIL ASSEMBLY 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.

      CAUTION:

      Always disconnect all fuel injector assembly 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 connectors.

      3. Ground the spark plug.

      4. Check if sparks occur while the engine is being cranked.

        OK
        Sparks jump across electrode gap.

    NG

    REPLACE ECM Click here

    OK

    REPLACE IGNITION COIL ASSEMBLY Click here

  36. CHECK FUEL LINE


    1. Check the fuel lines for leaks or blockage.


    NG

    REPAIR OR REPLACE FUEL LINE

    OK

    REPLACE FUEL PUMP Click here