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

A005HFPE03
A005LISE01
A005LISE02

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 conditions 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.

  • Since the temporary malfunction detected in the first trip is stored as pending freeze frame data, the malfunction state before the check engine warning light is turned on can be confirmed.

    Pending freeze frame data can be stored when an accidental fire in the catalyst above the temperature level is detected (when the check engine warning light flashes).

  • 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 or Long FT #1 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 warming up the engine.

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

  • Check the "Fuel Cut Elps Time" value in the Data List or the freeze frame data which were present when the malfunction occurred. If the value is more than 0 seconds, a high engine speed (fuel cut speed + 500 rpm or more) has occurred in the past. Since the misfire may be caused by valve rocker arm detaching due to an extremely high engine speed, check that the valve rocker arms are properly attached Click here

  • By clearing the DTC, "Fuel Cut Elps Time" will be cleared.

  • When a catalyst damaging misfire occurs, the check engine warning light flashes and pending freeze frame data are memorized upon a malfunction on the first trip.

  • Referring to the following contents of the freeze frame data (or the pending freeze frame data) enables an estimation of which cylinder has misfired and to what degree.


    • Cylinder #1 Misfire Count to Cylinder #4 Misfire Count: Misfire count according to cylinder.

    • Cat OT MF F/C Cylinder #1 to #4: This expresses a high-frequency misfire was concentrated in a certain cylinder and that cylinder's fuel injection was stopped.

  • In the past, when the primary ignition system (the igniter drive circuit in the engine control computer, the primary circuit in the No.1 ignition coil, the related wire harness, or the connector) was out of order, diagnostic codes from P0351 to P0354 were output. However, these codes are not output in this vehicle.

    When a failure in the primary ignition system is suspected, refer to "Cat OT MF F/C History", "Cat OT MF F/C Cylinder #1 to #4", and "Cylinder #1 Misfire Count to Cylinder #4 Misfire Count" in the freeze frame data, the pending freeze frame data, and the ECU data monitor, and confirm in which cylinder the high-frequency misfire was concentrated.

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 FREEZE FRAME DATA


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Using the intelligent tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

      Result
      Freeze Frame Data Item Result Proceed to
      Cat OT MF F/C History ON A
      OFF B

    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (PROHIBIT CAT OT F/C) Click here

    A

  5. INSPECT SPARK PLUG

    Tech Tips


    • Inspect the spark plug of the misfiring cylinder Click here.

    • According to the "Cat OT MF F/C Cylinder #1 to #4" on the Data List, check the spark plug of the malfunctioning cylinder.


    NG

    REPLACE SPARK PLUG Click here

    OK

  6. CHECK FOR SPARK (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. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (PROHIBIT CAT OT F/C)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Clear the DTCs 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 the vehicle is stopped and the engine is either idling or being revved within 3000 rpm.


    NEXT

  8. READ VALUE USING INTELLIGENT TESTER (CYLINDER #1 MISFIRE COUNT, #2, #3 AND #4)


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

    2. Start the engine and allow the engine to idle.

    3. Read each value for Cylinder #1 (to #4) Misfire Count displayed on the tester. If no misfire counts occur in any cylinders, perform steps (d) and (e) and then check the misfire counts again.

    4. 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.

    5. Read the Cylinder #1 (to #4) Misfire Count or 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), the misfire may be detected only when the engine is cold.

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


    B

    CHECK INTAKE SYSTEM Click here

    A

  9. INSPECT SPARK PLUG


    1. A005I74E51
      Text in Illustration
      *a 1.0 to 1.3 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
      1.3 mm (0.0512 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 SC20HR11

      Note

      If the electrode gap is larger than 1.3 mm (0.0512 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

  10. 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

  11. 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

  12. 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
      B5-2 - Body ground Ignition switch ON 11 to 14 V
      B7-2 - Body ground Ignition switch ON 11 to 14 V
      B9-2 - Body ground Ignition switch ON 11 to 14 V
      B11-2 - Body ground Ignition switch ON 11 to 14 V

    4. Reconnect the fuel injector assembly connectors.


    NG

    CHECK FUEL INJECTOR CIRCUIT Click here

    OK

  13. 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)
      for RHD
      Tester Connection Condition Specified Condition
      B5-1 - B23-20 (#10) Always Below 1 Ω
      B7-1 - B23-17 (#20) Always Below 1 Ω
      B9-1 - B23-18 (#30) Always Below 1 Ω
      B11-1 - B23-19 (#40) Always Below 1 Ω
      for LHD
      Tester Connection Condition Specified Condition
      B5-1 - B22-20 (#10) Always Below 1 Ω
      B7-1 - B22-17 (#20) Always Below 1 Ω
      B9-1 - B22-18 (#30) Always Below 1 Ω
      B11-1 - B22-19 (#40) Always Below 1 Ω
      Standard Resistance (Check for Short)
      for RHD
      Tester Connection Condition Specified Condition
      B5-1 - B23-20 (#10) - Body ground Always 10 kΩ or higher
      B7-1 - B23-17 (#20) - Body ground Always 10 kΩ or higher
      B9-1 - B23-18 (#30) - Body ground Always 10 kΩ or higher
      B11-1 - B23-19 (#40) - Body ground Always 10 kΩ or higher
      for LHD
      Tester Connection Condition Specified Condition
      B5-1 - B22-20 (#10) - Body ground Always 10 kΩ or higher
      B7-1 - B22-17 (#20) - Body ground Always 10 kΩ or higher
      B9-1 - B22-18 (#30) - Body ground Always 10 kΩ or higher
      B11-1 - B22-19 (#40) - Body ground Always 10 kΩ or higher

    4. Reconnect the fuel injector assembly connectors.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. 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

  15. 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

  16. CHECK FUEL PRESSURE


    1. Check the fuel pressure Click here.


    NG

    CHECK FUEL LINE Click here

    OK

  17. 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

  18. 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 5.4 gm/sec. and 9.6 gm/sec. (shift lever: neutral; A/C: off).

    NG

    CHECK HARNESS AND CONNECTOR Click here

    OK

  19. CHECK VALVE TIMING


    1. Remove the cylinder head cover Click here.

    2. Turn the crankshaft pulley, and align its groove with the alignment mark "0" of the timing chain cover.

    3. Check that the alignment mark of the camshaft timing sprocket is in the position shown in the illustration.

      Tech Tips

      If not, turn the crankshaft damper 1 revolution (360°) to align the alignment mark and sprocket as above.

      OK
      Alignment marks on camshaft timing gears are aligned as shown in the illustration
      A005IFVE01
      Text in Illustration
      *1 Alignment Mark
      *a Reference Camshaft Layout
      *b No. 1 Cylinder at TDC Compression

    4. Reinstall the cylinder head cover Click here.


    NG

    ADJUST VALVE TIMING Click here

    OK

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


    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. Confirm that the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test.

      OK
      MAP and idling condition change in response to EGR step position.
      Standard
      - EGR Step Position (Active Test)
      0 Steps 0 to 30 Steps
      Idling condition Steady idling Idling changes from steady to rough idling

      MAP

      (Data List)

      MAP value is 28 to 48 kPa

      (210 to 360 mmHg)

      (EGR valve is fully closed)

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

      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.

      • During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve.

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

    B

    CHECK HARNESS AND CONNECTOR Click here

    A

  21. 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. Reinstall the EGR valve assembly Click here.


    OK

    CHECK HARNESS AND CONNECTOR Click here

    NG

    REPLACE EGR VALVE ASSEMBLY Click here

  22. 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

  23. CHECK FUEL PRESSURE


    1. Check the fuel pressure Click here.


    NG

    CHECK FUEL LINE Click here

    OK

  24. 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

  25. 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 5.4 gm/sec. and 9.6 gm/sec. (shift lever: neutral; A/C: off).

    NG

    CHECK HARNESS AND CONNECTOR Click here

    OK

  26. CHECK VALVE TIMING


    1. Remove the cylinder head cover Click here.

    2. Turn the crankshaft pulley, and align its groove with the alignment mark "0" of the timing chain cover.

    3. Check that the alignment mark of the camshaft timing sprocket is in the position shown in the illustration.

      Tech Tips

      If not, turn the crankshaft damper 1 revolution (360°) to align the alignment mark and sprocket as above.

      OK
      Alignment marks on camshaft timing gears are aligned as shown in the illustration
      A005IFVE01
      Text in Illustration
      *1 Alignment Mark
      *a Reference Camshaft Layout
      *b No. 1 Cylinder at TDC Compression

    4. Reinstall the cylinder head cover Click here.


    NG

    ADJUST VALVE TIMING Click here

    OK

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


    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. Confirm that the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test.

      OK
      MAP and idling condition change in response to EGR step position.
      Standard
      - EGR Step Position (Active Test)
      0 Steps 0 to 30 Steps
      Idling condition Steady idling Idling changes from steady to rough idling

      MAP

      (Data List)

      MAP value is 28 to 48 kPa

      (210 to 360 mmHg)

      (EGR valve is fully closed)

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

      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.

      • During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve.

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

    B

    INSPECT SPARK PLUG Click here

    A

  28. 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. Reinstall the EGR valve assembly Click here.


    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

  29. INSPECT SPARK PLUG


    1. A005I74E51
      Text in Illustration
      *a 1.0 to 1.3 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
      1.3 mm (0.0512 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 SC20HR11

      Note

      If the electrode gap is larger than 1.3 mm (0.0512 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

  30. 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

  31. 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

  32. 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
      B5-2 - Body ground Ignition switch ON 11 to 14 V
      B7-2 - Body ground Ignition switch ON 11 to 14 V
      B9-2 - Body ground Ignition switch ON 11 to 14 V
      B11-2 - Body ground Ignition switch ON 11 to 14 V

    4. Reconnect the fuel injector assembly connectors.


    NG

    CHECK FUEL INJECTOR CIRCUIT Click here

    OK

  33. 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)
      for RHD
      Tester Connection Condition Specified Condition
      B5-1 - B23-20 (#10) Always Below 1 Ω
      B7-1 - B23-17 (#20) Always Below 1 Ω
      B9-1 - B23-18 (#30) Always Below 1 Ω
      B11-1 - B23-19 (#40) Always Below 1 Ω
      for LHD
      Tester Connection Condition Specified Condition
      B5-1 - B22-20 (#10) Always Below 1 Ω
      B7-1 - B22-17 (#20) Always Below 1 Ω
      B9-1 - B22-18 (#30) Always Below 1 Ω
      B11-1 - B22-19 (#40) Always Below 1 Ω
      Standard Resistance (Check for Short)
      for RHD
      Tester Connection Condition Specified Condition
      B5-1 - B23-20 (#10) - Body ground Always 10 kΩ or higher
      B7-1 - B23-17 (#20) - Body ground Always 10 kΩ or higher
      B9-1 - B23-18 (#30) - Body ground Always 10 kΩ or higher
      B11-1 - B23-19 (#40) - Body ground Always 10 kΩ or higher
      for LHD
      Tester Connection Condition Specified Condition
      B5-1 - B22-20 (#10) - Body ground Always 10 kΩ or higher
      B7-1 - B22-17 (#20) - Body ground Always 10 kΩ or higher
      B9-1 - B22-18 (#30) - Body ground Always 10 kΩ or higher
      B11-1 - B22-19 (#40) - Body ground Always 10 kΩ or higher

    4. Reconnect the fuel injector assembly connectors.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  34. 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

  35. 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

  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

    B

    END

    A

  37. 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)
      for RHD
      Tester Connection Condition Specified Condition
      B73-5 (VG) - B23-91 (VG) Always Below 1 Ω
      B73-4 (E2G) - B23-92 (E2G)
      for LHD
      Tester Connection Condition Specified Condition
      B73-5 (VG) - B22-91 (VG) Always Below 1 Ω
      B73-4 (E2G) - B22-92 (E2G)
      Standard Resistance (Check for Short)
      for RHD
      Tester Connection Condition Specified Condition
      B73-5 (VG) or B23-91 (VG) - Body ground Always 10 kΩ or higher
      for LHD
      Tester Connection Condition Specified Condition
      B73-5 (VG) or B22-91 (VG) - Body ground Always 10 kΩ or higher

    4. Reconnect the mass air flow meter connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  38. 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 17 and 24 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

  39. 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

  40. CHECK FUEL LINE


    1. Check the fuel lines for leaks or blockage.


    OK

    REPLACE FUEL PUMP Click here

    NG

    REPAIR OR REPLACE FUEL LINE