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

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

DESCRIPTION

A005L6UE16
*1 CMP Sensor
*2 CKP Sensor

When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely high hydrocarbon concentration levels can cause an 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 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 camshaft position sensor and the crankshaft position sensor. The camshaft position 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, and could cause emission control system performance 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 met (2 trip detection logic):


  • A misfire occurs that may damage the three-way catalytic converter (MIL blinks).

  • An 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

  • Fuel line

  • Fuel pump assembly

  • Mass air flow meter

  • 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

Misfiring of a specific cylinder occurs and one of the following conditions is met (2 trip detection logic):


  • A misfire occurs that may damage the three-way catalytic converter (MIL blinks).

  • An 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

The ECM illuminates the MIL and stores a DTC when the following condition, which could cause catalyst deterioration, is detected (2 trip detection logic).


The ECM flashes the MIL immediately when the following condition, which could cause three-way catalytic converter damage, is detected. Also, the ECM stores a DTC when the following condition is detected (2 trip detection logic).


WIRING DIAGRAM

Refer to DTC P0100 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 to ON.

  3. Turn the tester on.

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

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

  6. Switch the ECM from normal mode to check mode Click here.

  7. Read the misfire counts of each cylinder, Cylinder #1 Misfire Count to Cylinder #4 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 (rpm) 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 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 ignition switch off and wait for at least 5 seconds.

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

CAUTION / NOTICE / HINT

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.

  • 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 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 #4 Misfire Count.

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

  • 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 +/-15%, the air fuel ratio may be Rich (-15% or less) or Lean (+15% or more).

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

  • An extremely imbalanced drive wheel which causes body vibration may cause misfire DTCs to be detected.

PROCEDURE


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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

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

    5. Read the DTCs.

      Tech Tips

      Write down the indicated DTCs.

      Result
      Result Proceed to
      DTC P0300, P0301, P0302, P0303 and/or P0304 are output A
      DTC P0300, P0301, P0302, P0303 and/or P0304 and other DTCs are output B

      Tech Tips

      If any DTCs other than P0300, P0301, P0302, P0303 and P0304 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 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 to ON.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / 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 (CYLINDER #1 MISFIRE COUNT, #2, #3 AND #4)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

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

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Cylinder #1 (to #4) Misfire Count (Step "B").

    5. Read each value for Cylinder #1 (to #4) Misfire Count 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 first gear.

      3. Check the Cylinder #1 (to #4) Misfire Count.

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

    6. Drive the vehicle with the Misfire RPM and Misfire Load noted in the read value using the intelligent tester (Misfire RPM and Misfire Load) procedures above.

    7. Read Cylinder #1 (to #4) Misfire Count or the DTCs displayed on the tester.

      Result
      Result 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 record of the engine coolant temperature is below 75°C (167°F), it may only be possible to detect the misfire 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.


    B

    CHECK INTAKE SYSTEM Click here

    A

  5. INSPECT SPARK PLUG


    1. A005I7YE02
      Text in Illustration
      *a 1.0 to 1.4 mm

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

    2. Measure the spark plug electrode gap.

      Maximum Electrode Gap for a Used Spark Plug
      1.4 mm (0.0551 in.)

      If the gap is greater than the maximum, replace the spark plug.

      Electrode Gap for a New Spark Plug
      1.0 to 1.1 mm (0.0394 to 0.0433 in.)

    3. Check the electrode for carbon deposits.

      Recommended Spark Plug
      Manufacturer Product
      DENSO FK16HR11

      Note

      If the electrode gap is larger than 1.4 mm (0.0551 in.), replace the spark plug. Do not adjust the electrode gap.

    4. Reinstall the ignition coil assembly and spark plug.


    NG

    REPLACE SPARK PLUG Click here

    OK

  6. CHECK FOR SPARKS (SPARK TEST)


    1. Perform a spark test Click here.

      Tech Tips

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


    NEXT

  7. 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

  8. INSPECT FUEL INJECTOR ASSEMBLY (POWER SOURCE)


    1. A005MENE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Fuel Injector Assembly)

      Disconnect the fuel injector assembly connectors.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B5-1 - Body ground Ignition switch ON 11 to 14 V
      B7-1 - Body ground Ignition switch ON 11 to 14 V
      B9-1 - Body ground Ignition switch ON 11 to 14 V
      B11-1 - Body ground Ignition switch ON 11 to 14 V

    4. Reconnect the fuel injector assembly connectors.


    NG

    CHECK FUEL INJECTOR CIRCUIT Click here

    OK

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


    1. Disconnect the fuel injector assembly connectors.

    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
      B5-2 - B23-20 (#10) Always Below 1 Ω
      B7-2 - B23-17 (#20) Always Below 1 Ω
      B9-2 - B23-18 (#30) Always Below 1 Ω
      B11-2 - B23-19 (#40) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B5-2 or B23-20 (#10) - Body ground Always 10 Ω or higher
      B7-2 or B23-17 (#20) - Body ground Always 10 Ω or higher
      B9-2 or B23-18 (#30) - Body ground Always 10 Ω or higher
      B11-2 or B23-19 (#40) - Body ground Always 10 Ω or higher

    4. Reconnect the fuel injector assembly connectors.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  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) Click here.

      Tech Tips

      Perform "Inspection After Repairs" after replacing the fuel injector assembly Click here.


    NG

    REPLACE FUEL INJECTOR ASSEMBLY Click here

    OK

  11. 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 Click here

    OK

  12. CHECK FUEL PRESSURE


    1. Check the fuel pressure Click here.


    NG

    CHECK FUEL LINE Click here

    OK

  13. READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / 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:
      75 to 100°C (167 to 212°F).

    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    OK

  14. READ VALUE USING INTELLIGENT TESTER (MAF)


    1. Read the values using the intelligent tester (MAF).

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON (do not start the engine).

    4. Turn the tester on.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / MAF and Coolant Temp.

    6. Allows the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.

    7. Read MAF with the engine speed 3000 rpm.

      Standard
      Between 4.0 gm/sec. and 10.0 gm/sec. (shift lever: Neutral position; A/C: off).

    NG

    CHECK HARNESS AND CONNECTOR Click here

    OK

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


    1. Check the EGR valve assembly operation.


      1. Connect the intelligent tester to the DLC3.

      2. Turn the ignition switch to ON.

      3. Turn the tester on.

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

        Tech Tips

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

      5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.

      6. Check the engine idling condition in the Data List while performing the Active Test.

        OK

        EGR Step Position

        (Active Test)

        		 Specified Condition
        0 Steps Steady idling
        0 to 30 Steps Idling changes from steady to rough idling

        Tech Tips


        • 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.

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

    B

    CHECK VALVE TIMING Click here

    A

  16. INSPECT EGR VALVE ASSEMBLY


    1. Remove the EGR valve assembly Click here.

    2. Check for contamination between the EGR valve and housing.

      OK
      No leaks or blockage

    3. Install the EGR valve assembly Click here.


    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

  17. CHECK VALVE TIMING

    Tech Tips

    There are no marks on the cylinder head to match up for the purpose of checking valve timing. Valve timing can only be inspected by lining up the colored plates on the timing chain with the marks on the pulleys. It may be necessary to remove and reinstall the chain to match up the alignment marks Click here.


    NEXT

  18. CHECK WHETHER DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 OR P0304)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Drive the vehicle referring to the Confirmation Driving Pattern.

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

    6. Read the DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC P0300, P0301, P0302, P0303 or P0304 is output B

    A

    END

    B

    CHECK HARNESS AND CONNECTOR Click here

  19. 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 Click here

    OK

  20. READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / 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:
      75 to 100°C (167 to 212°F).

    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    OK

  21. READ VALUE USING INTELLIGENT TESTER (MAF)


    1. Read the values using the intelligent tester (MAF).

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON (do not start the engine).

    4. Turn the tester on.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / MAF and Coolant Temp.

    6. Allows the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.

    7. Read MAF with the engine speed 3000 rpm.

      Standard
      Between 4.0 gm/sec. and 10.0 gm/sec. (shift lever: Neutral position; A/C: off).

    NG

    CHECK HARNESS AND CONNECTOR Click here

    OK

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


    1. Check the EGR valve assembly operation.


      1. Connect the intelligent tester to the DLC3.

      2. Turn the ignition switch to ON.

      3. Turn the tester on.

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

        Tech Tips

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

      5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.

      6. Check the engine idling condition in the Data List while performing the Active Test.

        OK

        EGR Step Position

        (Active Test)

        		 Specified Condition
        0 Steps Steady idling
        0 to 30 Steps Idling changes from steady to rough idling

        Tech Tips


        • 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.

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

    B

    INSPECT SPARK PLUG Click here

    A

  23. INSPECT EGR VALVE ASSEMBLY


    1. Remove the EGR valve assembly Click here.

    2. Check for contamination between the EGR valve and housing.

      OK
      No leaks or blockage

    3. Install the EGR valve assembly Click here.


    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

  24. INSPECT SPARK PLUG


    1. A005I7YE02
      Text in Illustration
      *a 1.0 to 1.4 mm

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

    2. Measure the spark plug electrode gap.

      Maximum Electrode Gap for a Used Spark Plug
      1.4 mm (0.0551 in.)

      If the gap is greater than the maximum, replace the spark plug.

      Electrode Gap for a New Spark Plug
      1.0 to 1.1 mm (0.0394 to 0.0433 in.)

    3. Check the electrode for carbon deposits.

      Recommended Spark Plug
      Manufacturer Product
      DENSO FK16HR11

      Note

      If the electrode gap is larger than 1.4 mm (0.0551 in), replace the spark plug. Do not adjust the electrode gap.

    4. Reinstall the ignition coil assembly and spark plug.


    NG

    REPLACE SPARK PLUG Click here

    OK

  25. CHECK FOR SPARKS (SPARK TEST)


    1. Perform a spark test Click here.

      Tech Tips

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


    NEXT

  26. 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

  27. INSPECT FUEL INJECTOR ASSEMBLY (POWER SOURCE)


    1. A005M5AE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Fuel Injector Assembly)

      Disconnect the fuel injector assembly connectors.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      B5-1 - Body ground Ignition switch ON 11 to 14 V
      B7-1 - Body ground Ignition switch ON 11 to 14 V
      B9-1 - Body ground Ignition switch ON 11 to 14 V
      B11-1 - Body ground Ignition switch ON 11 to 14 V

    4. Reconnect the fuel injector assembly connectors.


    NG

    CHECK FUEL INJECTOR CIRCUIT Click here

    OK

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


    1. Disconnect the fuel injector assembly connectors.

    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
      B5-2 - B23-20 (#10) Always Below 1 Ω
      B7-2 - B23-17 (#20) Always Below 1 Ω
      B9-2 - B23-18 (#30) Always Below 1 Ω
      B11-2 - B23-19 (#40) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B5-2 or B23-20 (#10) - Body ground Always 10 Ω or higher
      B7-2 or B23-17 (#20) - Body ground Always 10 Ω or higher
      B9-2 or B23-18 (#30) - Body ground Always 10 Ω or higher
      B11-2 or B23-19 (#40) - Body ground Always 10 Ω or higher

    4. Reconnect the fuel injector assembly connectors.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  29. 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.

      Tech Tips

      Perform "Inspection After Repairs" after replacing the fuel injector assembly Click here.


    NG

    REPLACE FUEL INJECTOR ASSEMBLY Click here

    OK

  30. CHECK VALVE TIMING

    Tech Tips

    There are no marks on the cylinder head to match up for the purpose of checking valve timing. Valve timing can only be inspected by lining up the colored plates on the timing chain with the marks on the pulleys. It may be necessary to remove and reinstall the chain to match up the alignment marks Click here.


    NEXT

  31. CHECK WHETHER DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 OR P0304)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Drive the vehicle referring to the Confirmation Driving Pattern.

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

    6. Read the DTCs.

      Result
      Result Proceed to
      DTC P0300, P0301, P0302, P0303 or P0304 is output A
      DTC is not output B

    B

    END

    A

  32. CHECK HARNESS AND CONNECTOR


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

      Tech Tips

      Repair any problems.


    NEXT

  33. CHECK WHETHER DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 OR P0304)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Drive the vehicle referring to the Confirmation Driving Pattern.

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

    6. Read the DTCs.

      Result
      Result Proceed to
      DTC P0300, P0301, P0302, P0303 or P0304 is output A
      DTC is not output B

    B

    END

    A

  34. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)


    1. Disconnect the mass air flow meter 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
      B72-3 (VG) - B23-91 (VG) Always Below 1 Ω
      B72-2 (E2G) - B23-92 (E2G) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      B72-3 (VG) or B23-91 (VG) - Body ground Always 10 Ω or higher

    4. Reconnect the mass air flow meter connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  35. REPLACE MASS AIR FLOW METER


    1. Replace the mass air flow meter Click here.

      Tech Tips


      • If the results of the inspections performed in steps 14 and 21 indicated no problem, proceed to the next step without replacing the mass air flow meter.

      • Perform "Inspection After Repairs" after replacing the mass air flow meter Click here.


    NEXT

  36. CHECK WHETHER DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 OR P0304)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Drive the vehicle referring to the Confirmation Driving Pattern.

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

    6. Read the DTCs.

      Result
      Result Proceed to
      DTC P0300, P0301, P0302, P0303 or P0304 is output A
      DTC is not output B

    A

    REPLACE ECM Click here

    B

    END

  37. CHECK FUEL LINE


    1. Check the fuel lines for leaks or blockage.


    OK

    REPLACE FUEL PUMP Click here

    NG

    REPAIR OR REPLACE FUEL LINE