SFI SYSTEM (w/ EGR 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 (HC) enter the exhaust gas. Extremely high hydrocarbon concentration levels can cause increases in exhaust emission levels. 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 these increases in emissions and to limit the possibility of thermal damage, the ECM monitors the misfire count. 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 level and could cause emission deterioration, 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 the following conditions 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 connections

  • 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

  • Intake system

  • EGR valve assembly

  • ECM

P0301

P0302

P0303

P0304

P0305

P0306

Misfiring of specific cylinder occurs and one of the following conditions is detected

(2 trip detection logic):


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

  • Emission deterioration misfire occurs (MIL illuminates)

When DTCs for misfiring cylinders are randomly 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.

MONITOR DESCRIPTION

A01NGT2E01
Text in Illustration
*1 VVT Sensor
*2 Crankshaft Position Sensor (36-2 teeth)
*3 ECM


WIRING DIAGRAM

A01NHYQE08

CONFIRMATION DRIVING PATTERN


  1. Connect the intelligent tester to the DLC3.

  2. Turn the power switch on (IG).

  3. Turn the tester on.

  4. Put the engine in inspection mode Click here.

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

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

  7. Read the misfire counts of each cylinder (Cylinder #1 (to #6) Misfire Count) 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, shown in Misfire RPM and Misfire Load in the Data List.

    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, using the Misfire RPM and Misfire Load in the Data List.

    Engine Speed Duration
    Idling 5 minutes or more
    1000 4 minutes or more
    1500 3 minutes or more
    2500 2 minutes or more

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

    Tech Tips

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

  10. Record the DTC(s), freeze frame data and misfire counts.

  11. Turn the power switch off and wait for at least 5 seconds.

INSPECTION PROCEDURE

Tech Tips


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

  • Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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 cylinder engine, 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 DTCs Click here.

    2. Put the engine in inspection mode Click here.

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

    4. Read the misfiring rates of each cylinder or DTC(s) using the intelligent tester.

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

    6. 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 misfires have occurred only while the engine is being warmed up.

  • 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 power switch on (IG).

    3. Turn the tester on.

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

    5. Read the 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

      Tech Tips

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


    B

    GO TO DTC CHART Click here

    A

  2. CHECK PCV HOSE (HOSE CONNECTIONS)


    1. Check the PCV hose connections Click here.

      OK
      PCV hose is connected correctly 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 power switch on (IG).

    3. Turn the tester on.

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

    5. 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 (CATALYST OT MF F/C)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / 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 A
      Not Avl B

    B

    READ VALUE USING INTELLIGENT TESTER (CYLINDER #1 (TO #6) MISFIRE COUNT) Click here

    A

  5. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Put the engine in inspection mode Click here.

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Prohibit the Catalyst OT Misfire prevent F/C.

    6. Perform the Active Test.

      Note

      When performing the Active Test, make sure that the vehicle is stopped and either idling or being revved within 2500 rpm.


    NEXT

  6. READ VALUE USING INTELLIGENT TESTER (CYLINDER #1 (TO #6) MISFIRE COUNT)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on (Step "A").

    4. Put the engine in inspection mode Click here.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Cylinder #1 (to #6) Misfire Count (Step "B").

    6. Read each value for Cylinder #1 (to #6) Misfire Count displayed on the tester. If no misfire counts occur in any cylinders, perform the following procedure:


      1. Start the engine and let it idle.

      2. Move the shift lever to D.

      3. Check the Cylinder #1 (to #6) Misfire Count.

      4. If misfire counts are still not displayed, perform steps ("A") and ("B").

    7. Drive the vehicle while satisfying the Misfire RPM and Misfire Load values noted in the "Read Value Using tester (Misfire RPM and Misfire Load)" procedure above.

    8. Read Cylinder #1 (to #6) Misfire Count or the 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 the Coolant Temp value of the freeze frame data is below 75°C (167°F), the misfire may be detected only when the engine is cold.

      • If Engine Run Time value of the freeze frame data is below 120 seconds, the misfire may be detected immediately after the engine is started.


    B

    CHECK INTAKE SYSTEM Click here

    A

  7. CHECK SPARK PLUG


    1. A01NFJWE18

      Remove the ignition coil assembly and the spark plug of the misfiring cylinder.

    2. Measure the spark plug electrode gap.

      Maximum gap
      1.4 mm (0.0551 in.)

    3. Check the electrode for carbon deposits.

      Recommended Spark Plug
      Manufacturer Product
      DENSO FK20HR11

      Note

      If the electrode gap is larger than the maximum, replace the spark plug. Do not adjust the electrode gap.

    4. Reinstall the ignition coil assembly and the spark plug.


    NG

    REPLACE SPARK PLUG Click here

    OK

  8. CHECK FOR SPARK AND IGNITION (SPARK TEST)


    1. Perform a spark test Click here.

      CAUTION:

      During the test, disconnect all fuel injector assembly connectors.

      Note

      Do not crank the engine for more than 2 seconds.

      OK
      Spark jumps across electrode gap.

    NG

    CHANGE TO KNOWN GOOD SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER Click here

    OK

  9. CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER


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


    NG

    CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

    OK

  10. CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE)


    1. A01NFSPE22
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Fuel Injector Assembly)

      Disconnect the fuel injector assembly connectors.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D13-2 - Body ground Power switch on (IG) 11 to 14 V
      D14-2 - Body ground Power switch on (IG) 11 to 14 V
      D15-2 - Body ground Power switch on (IG) 11 to 14 V
      D16-2 - Body ground Power switch on (IG) 11 to 14 V
      D17-2 - Body ground Power switch on (IG) 11 to 14 V
      D18-2 - Body ground Power switch on (IG) 11 to 14 V

    4. Reconnect the fuel injector assembly connectors.


    NG

    CHECK FUEL INJECTOR CIRCUIT Click here

    OK

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


    1. Disconnect the fuel injector assembly connectors.

      A01NFDAE03

    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
      D13-1 - D1-19 (#10) Always Below 1 Ω
      D14-1 - D1-20 (#20) Always Below 1 Ω
      D15-1 - D1-53 (#30) Always Below 1 Ω
      D16-1 - D1-49 (#40) Always Below 1 Ω
      D17-1 - D1-21 (#50) Always Below 1 Ω
      D18-1 - D1-52 (#60) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D13-1 or D1-19 (#10) - Body ground Always 10 kΩ or higher
      D14-1 or D1-20 (#20) - Body ground Always 10 kΩ or higher
      D15-1 or D1-53 (#30) - Body ground Always 10 kΩ or higher
      D16-1 or D1-49 (#40) - Body ground Always 10 kΩ or higher
      D17-1 or D1-21 (#50) - Body ground Always 10 kΩ or higher
      D18-1 or D1-52 (#60) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Fuel Injector Assembly)

      		 *2

      Front view of wire harness connector

      (to ECM)

    4. Reconnect the fuel injector assembly connectors.

    5. Reconnect the ECM connector.


    NG

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

    OK

  12. INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30, #40, #50 AND/OR #60 VOLTAGE)


    1. A01NH3PE06
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D1-19 (#10) - D1-57 (E01) Power switch on (IG) 11 to 14 V
      D1-20 (#20) - D1-57 (E01) Power switch on (IG) 11 to 14 V
      D1-53 (#30) - D1-57 (E01) Power switch on (IG) 11 to 14 V
      D1-49 (#40) - D1-57 (E01) Power switch on (IG) 11 to 14 V
      D1-21 (#50) - D1-57 (E01) Power switch on (IG) 11 to 14 V
      D1-52 (#60) - D1-57 (E01) Power switch on (IG) 11 to 14 V

    4. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND)

    OK

  13. 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) Click here.


    NG

    REPLACE FUEL INJECTOR ASSEMBLY Click here

    OK

  14. INSPECT INTAKE SYSTEM


    1. Check the intake system for vacuum leaks Click here.

      OK
      No leaks in intake system.

    NG

    REPAIR OR REPLACE INTAKE SYSTEM

    OK

  15. CHECK FUEL PRESSURE


    1. Check the fuel pressure Click here.


    NG

    CHECK FUEL LINE Click here

    OK

  16. READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power 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 Coolant Temp twice, when the engine is both cold and warmed up.

      Standard
      With cold engine
      Same as ambient temperature.
      With warm engine
      Between 75°C and 95°C (167°F and 203°F).

    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    OK

  17. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY


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


    NG

    REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Click here

    OK

  18. CHECK VALVE TIMING


    1. Check the valve timing Click here.


    NG

    ADJUST VALVE TIMING Click here

    OK

  19. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE EGR STEP POSITION)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Put the engine in inspection mode (maintenance mode) Click here.

    5. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

      Tech Tips

      The A/C switch and all accessory switches should be off.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / All Data / Throttle Idle Position and MAP.

    7. Confirm that the Throttle Idle Position is ON and check the MAP value in the Data List while performing the Active Test.

      Note


      • Do not leave the EGR valve open for 10 seconds or more during the Active Test.

      • Be sure to return the EGR valve to step 0 when the Active Test is completed.

      • Do not open the EGR valve 30 steps or more during the Active Test.

      OK
      MAP change in response to EGR step position when Throttle Idle Position is ON in Data List.
      Standard
      - EGR Step Position (Active Test)
      0 Steps 0 to 30 Steps

      MAP

      (Data List)

      		 (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed

      Tech Tips


      • While performing the Active Test, if the increase in the value of MAP is small, the EGR valve assembly may be a malfunctioning.

      • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of MAP may occur while performing the Active Test. However, the amount that the value of MAP increases will be smaller than normal.

      Result
      Result Proceed to
      Outside of standard range A
      Within standard range B

    B

    REPLACE ECM Click here

    A

  20. INSPECT EGR VALVE ASSEMBLY


    1. Remove the EGR valve assembly Click here.

    2. Check if the EGR valve is stuck open.

      OK
      EGR valve is tightly closed.

    3. Reinstall the EGR valve assembly Click here.


    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

  21. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  22. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Clear the DTC Click here.

    5. Turn the power switch off.

    6. Turn the power switch on (IG) and turn the tester on.

    7. Put the engine in inspection mode Click here.

    8. Start the engine and warm it up.

    9. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

    10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

    11. Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305 or P0306.

    12. Check the DTC judgment result.


    NEXT

    END

  23. CHECK INTAKE SYSTEM


    1. Check the intake system for vacuum leaks Click here.

      OK
      No leaks in intake system.

    NG

    REPAIR OR REPLACE INTAKE SYSTEM

    OK

  24. CHECK FUEL PRESSURE


    1. Check the fuel pressure Click here.


    NG

    CHECK FUEL LINE Click here

    OK

  25. READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power 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 Coolant Temp twice, when the engine is both cold and warmed up.

      Standard
      With cold engine
      Same as ambient air temperature.
      With warm engine
      Between 75°C and 95°C (167°F and 203°F).

    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    OK

  26. INSPECT MASS AIR FLOW METER SUB-ASSEMBLY


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


    NG

    REPLACE MASS AIR FLOW METER SUB-ASSEMBLY Click here

    OK

  27. CHECK VALVE TIMING


    1. Check the valve timing Click here.


    NG

    ADJUST VALVE TIMING Click here

    OK

  28. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE EGR STEP POSITION)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Put the engine in inspection mode (maintenance mode) Click here.

    5. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

      Tech Tips

      The A/C switch and all accessory switches should be off.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / All Data / Throttle Idle Position and MAP.

    7. Confirm that the Throttle Idle Position is ON and check the MAP value in the Data List while performing the Active Test.

      Note


      • Do not leave the EGR valve open for 10 seconds or more during the Active Test.

      • Be sure to return the EGR valve to step 0 when the Active Test is completed.

      • Do not open the EGR valve 30 steps or more during the Active Test.

      OK
      MAP change in response to EGR step position when Throttle Idle Position is ON in Data List.
      Standard
      - EGR Step Position (Active Test)
      0 Steps 0 to 30 Steps

      MAP

      (Data List)

      		 (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed

      Tech Tips


      • While performing the Active Test, if the increase in the value of MAP is small, the EGR valve assembly may be a malfunctioning.

      • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of MAP may occur while performing the Active Test. However, the amount that the value of MAP increases will be smaller than normal.

      Result
      Result Proceed to
      Outside of standard range A
      Within standard range B

    B

    CHECK SPARK PLUG Click here

    A

  29. INSPECT EGR VALVE ASSEMBLY


    1. Remove the EGR valve assembly Click here.

    2. Check if the EGR valve is stuck open.

      OK
      EGR valve is tightly closed.

    3. Reinstall the EGR valve assembly Click here.


    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

  30. CHECK SPARK PLUG


    1. A01NFJWE18

      Remove the ignition coil assembly and the spark plug of the misfiring cylinder.

    2. Measure the spark plug electrode gap.

      Maximum gap
      1.4 mm (0.0551 in.)

    3. Check the electrode for carbon deposits.

      Recommended Spark Plug
      Manufacturer Product
      DENSO FK20HR11

      Note

      If the electrode gap is larger than the maximum, replace the spark plug. Do not adjust the electrode gap.

    4. Reinstall the ignition coil assembly and the spark plug.


    NG

    REPLACE SPARK PLUG Click here

    OK

  31. CHECK FOR SPARK AND IGNITION (SPARK TEST)


    1. Perform a spark test Click here.

      CAUTION:

      During the test, disconnect all fuel injector assembly connectors.

      Note

      Do not crank the engine for more than 2 seconds.

      OK
      Spark jumps across electrode gap.

    NG

    CHANGE TO KNOWN GOOD SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER Click here

    OK

  32. CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER


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


    NG

    CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

    OK

  33. CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE)


    1. A01NFSPE22
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Fuel Injector Assembly)

      Disconnect the fuel injector assembly connectors.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D13-2 - Body ground Power switch on (IG) 11 to 14 V
      D14-2 - Body ground Power switch on (IG) 11 to 14 V
      D15-2 - Body ground Power switch on (IG) 11 to 14 V
      D16-2 - Body ground Power switch on (IG) 11 to 14 V
      D17-2 - Body ground Power switch on (IG) 11 to 14 V
      D18-2 - Body ground Power switch on (IG) 11 to 14 V

    4. Reconnect the fuel injector assembly connectors.


    NG

    CHECK FUEL INJECTOR CIRCUIT Click here

    OK

  34. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)


    1. Disconnect the fuel injector assembly connectors.

      A01NFDAE03

    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
      D13-1 - D1-19 (#10) Always Below 1 Ω
      D14-1 - D1-20 (#20) Always Below 1 Ω
      D15-1 - D1-53 (#30) Always Below 1 Ω
      D16-1 - D1-49 (#40) Always Below 1 Ω
      D17-1 - D1-21 (#50) Always Below 1 Ω
      D18-1 - D1-52 (#60) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      D13-1 or D1-19 (#10) - Body ground Always 10 kΩ or higher
      D14-1 or D1-20 (#20) - Body ground Always 10 kΩ or higher
      D15-1 or D1-53 (#30) - Body ground Always 10 kΩ or higher
      D16-1 or D1-49 (#40) - Body ground Always 10 kΩ or higher
      D17-1 or D1-21 (#50) - Body ground Always 10 kΩ or higher
      D18-1 or D1-52 (#60) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Fuel Injector Assembly)

      		 *2

      Front view of wire harness connector

      (to ECM)

    4. Reconnect the fuel injector assembly connectors.

    5. Reconnect the ECM connector.


    NG

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

    OK

  35. INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30, #40, #50 AND/OR #60 VOLTAGE)


    1. A01NH3PE06
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D1-19 (#10) - D1-57 (E01) Power switch on (IG) 11 to 14 V
      D1-20 (#20) - D1-57 (E01) Power switch on (IG) 11 to 14 V
      D1-53 (#30) - D1-57 (E01) Power switch on (IG) 11 to 14 V
      D1-49 (#40) - D1-57 (E01) Power switch on (IG) 11 to 14 V
      D1-21 (#50) - D1-57 (E01) Power switch on (IG) 11 to 14 V
      D1-52 (#60) - D1-57 (E01) Power switch on (IG) 11 to 14 V

    4. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND)

    OK

  36. 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) Click here.


    NG

    REPLACE FUEL INJECTOR ASSEMBLY Click here

    OK

  37. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

  38. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the tester on.

    4. Clear the DTC Click here.

    5. Turn the power switch off.

    6. Turn the power switch on (IG) and turn the tester on.

    7. Put the engine in inspection mode Click here.

    8. Start the engine and warm it up.

    9. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.

    10. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

    11. Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305 or P0306.

    12. Check the DTC judgment result.


    NEXT

    END

  39. CHANGE TO KNOWN GOOD SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER


    1. Change the installed spark plug to a known good spark plug.

    2. Perform a spark test Click here.

      CAUTION:

      During the test, disconnect all fuel injector assembly connectors.

      Note

      Do not crank the engine for more than 2 seconds.

      OK
      Spark jumps across electrode gap.

    NG

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

    OK

    REPLACE SPARK PLUG Click here

  40. CHANGE TO KNOWN GOOD IGNITION COIL ASSEMBLY AND CHECK SPARK OF MISFIRING CYLINDER


    1. Change the installed ignition coil assembly to a known good ignition coil assembly.

    2. Perform a spark test Click here.

      CAUTION:

      During the test, disconnect all fuel injector assembly connectors.

      Note

      Do not crank the engine for more than 2 seconds.

      OK
      Spark jumps across electrode gap.

    NG

    REPLACE ECM Click here

    OK

    REPLACE IGNITION COIL ASSEMBLY Click here

  41. CHECK FUEL LINE


    1. Check the fuel lines for leaks or blockage.


    NG

    REPAIR OR REPLACE FUEL LINE

    OK

    REPLACE FUEL PUMP Click here