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

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 stores a DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0300 Random / Multiple Cylinder Misfire Detected

Simultaneous misfiring of several cylinders occurs and either of the following conditions is met (2 trip detection logic):


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

  • An 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

  • Intake system

  • ECM

Comes on/Blinks*

*: The MIL flashes when a catalyst-damaging misfire is detected.

 DTC stored
P0301 Cylinder 1 Misfire Detected

Misfiring of the No. 1 cylinder occurs and either of the following conditions is met (2 trip detection logic):


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

  • An 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

  • Intake system

  • ECM

Comes on/Blinks*

*: The MIL flashes when a catalyst-damaging misfire is detected.

 DTC stored
P0302 Cylinder 2 Misfire Detected

Misfiring of the No. 2 cylinder occurs and either of the following conditions is met (2 trip detection logic):


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

  • An 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

  • Intake system

  • ECM

Comes on/Blinks*

*: The MIL flashes when a catalyst-damaging misfire is detected.

 DTC stored
P0303 Cylinder 3 Misfire Detected

Misfiring of the No. 3 cylinder occurs and either of the following conditions is met (2 trip detection logic):


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

  • An 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

  • Intake system

  • ECM

Comes on/Blinks*

*: The MIL flashes when a catalyst-damaging misfire is detected.

 DTC stored
P0304 Cylinder 4 Misfire Detected

Misfiring of the No. 4 cylinder occurs and either of the following conditions is met (2 trip detection logic):


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

  • An 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

  • Intake system

  • ECM

Comes on/Blinks*

*: The MIL flashes when a catalyst-damaging misfire is detected.

 DTC stored

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

MONITOR DESCRIPTION

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


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


MONITOR STRATEGY

Required Sensors/Components (Main)

Crankshaft position sensor

Camshaft position sensor
Required Sensors/Components (Related)

Engine coolant temperature

Intake air temperature sensor

Mass air flow meter sub-assembly
Frequency of Operation Continuous

TYPICAL ENABLING CONDITIONS

Misfire
Intake air temperature Higher than -10°C (14°F)
Either of the following conditions is met (a) or (b)
(a) Engine coolant temperature at engine start Higher than -7°C (19°F)
(b) Engine coolant temperature Higher than 20°C (68°F)
Monitor Period of Emission-related Misfire
Duration Crankshaft 1000 revolutions x 4
Monitor Period of Catalyst-damaging Misfire (MIL Blinks)
Duration Crankshaft 200 revolutions x 3

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG).

  3. Turn the GTS on.

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

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

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

    Click here

  7. Read the misfire count 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 so that the vehicle conditions displayed in Misfire RPM and Misfire Load of the Data List are the same as the freeze frame data. Perform this step several times.

    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 8.0 minutes or more
    1000 4.5 minutes or more
    2000 2.5 minutes or more
    3000 1.5 minutes or more

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

    Tech Tips

    Do not turn the engine 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 engine switch off and wait for at least 30 seconds.

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

WIRING DIAGRAM

Refer to DTC P0102 for the mass air flow meter sub-assembly circuit.

Click here

Refer to Fuel Injector Circuit.

Click here

CAUTION / NOTICE / HINT

Note

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

Tech Tips


  • Check the "Fuel Cut Elps Time" in the Data List or the Freeze Frame Data.

    If the elapsed time is over 0 seconds, then the engine speed is high (engine speed at which fuel cut occurs + 500 rpm).

    When this has happened, there is the possibility that the No. 1 valve rocker arm sub-assembly will become loose and a fire could start, so check that the No. 1 valve rocker arm sub-assembly is properly attached.

    Click here

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

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

  • Read freeze frame data using the GTS. 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, the following factors can be considered to be a possible cause of the problem:


    1. There was insufficient fuel in the tank.

    2. Improper fuel was used.

    3. The spark plugs have been contaminated.

    4. The problem requires further diagnosis.

  • 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 stored 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 +/-15%, the air fuel ratio may be rich (-15% or less) or lean (15% or higher).

  • When 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 stored.

PROCEDURE


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


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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

    5. Read the DTCs.


      Powertrain > Engine and ECT > Trouble Codes
      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 or P0304 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK PCV HOSE CONNECTIONS


    1. Check the PCV hose connections.

      Click here

      OK
      PCV valve and hose are correctly connected and are not damaged.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE PCV HOSE

    OK

  3. READ VALUE USING GTS (MISFIRE RPM AND MISFIRE LOAD)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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


      Powertrain > Engine and ECT > Data List
      Tester Display
      Misfire RPM
      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.

      Result
      Proceed to
      NEXT

    NEXT

  4. READ VALUE USING GTS (CYLINDER MISFIRE COUNT)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Cylinder #1 Misfire Count, Cylinder #2 Misfire Count, Cylinder #3 Misfire Count and Cylinder #4 Misfire Count.


      Powertrain > Engine and ECT > Data List
      Tester Display
      Cylinder #1 Misfire Count
      Cylinder #2 Misfire Count
      Cylinder #3 Misfire Count
      Cylinder #4 Misfire Count

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

    6. Read each value for Cylinder #1 Misfire Count to Cylinder #4 Misfire Count displayed on the GTS. If no misfire counts occur in any cylinders, perform procedure [A] and [B] and then check the misfire counts again.

    7. Drive the vehicle with the Misfire RPM and Misfire Load noted in the read value using GTS (Misfire RPM and Misfire Load) procedures above [A].

    8. Read the Cylinder #1 Misfire Count to Cylinder #4 Misfire Count or DTCs displayed on the GTS [B].

      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

  5. INSPECT SPARK PLUG


    1. Inspect the spark plug of the misfiring cylinder.

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the spark plug.

      Click here

      Result
      Proceed to
      OK
      NG

    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.

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

        Click here

      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK CYLINDER COMPRESSION PRESSURE


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

      Click here

      Tech Tips

      Perform "Inspection After Repair" after repairing or replacing the engine assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

    OK

  8. CHECK TERMINAL VOLTAGE (#10, #20, #30 AND/OR #40)


    1. B0057IXC90
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C65-98 (#10) - C65-57 (E01) Engine switch on (IG) 11 to 14 V
      C65-95 (#20) - C65-57 (E01) Engine switch on (IG) 11 to 14 V
      C65-96 (#30) - C65-57 (E01) Engine switch on (IG) 11 to 14 V
      C65-97 (#40) - C65-57 (E01) Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK FUEL INJECTOR CIRCUIT Click here

    OK

  9. 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 Repair" after replacing the fuel injector assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FUEL INJECTOR ASSEMBLY Click here

    OK

  10. CHECK INTAKE SYSTEM


    1. Check the intake system for vacuum leaks.

      Click here

      OK
      No leaks from intake system.

      Tech Tips

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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE INTAKE SYSTEM

    OK

  11. CHECK FUEL PRESSURE


    1. Check the fuel pressure.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 32 Click here

    OK

  12. READ VALUE USING GTS (COOLANT TEMP)

    Result
    Proceed to
    OK
    NG

    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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


      Powertrain > Engine and ECT > Data List
      Tester Display
      Coolant Temp

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

      Standard
      GTS Display Condition Specified Condition
      Coolant Temp Cold engine Same as ambient air temperature
      Warm engine Between 75 and 100°C (167 and 212°F)

      Tech Tips

      Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    OK

  13. READ VALUE USING GTS (MAF)

    Result
    Proceed to
    OK
    NG

    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / MAF, Coolant Temp and Engine Speed.


      Powertrain > Engine and ECT > Data List
      Tester Display
      Engine Speed
      MAF
      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 3000 rpm.

      Standard
      GTS Display Condition Specified Condition
      MAF

      Shift lever position: N

      A/C: Off

      Engine Speed: 3000 rpm

      		 Between 3.0 gm/sec and 8.0 gm/sec
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 27 Click here

    OK

  14. CHECK ENGINE MECHANICAL SYSTEM


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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

    OK

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


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

    6. Turn the engine switch on (IG).

    7. Turn the GTS on.

    8. Start the engine.

    9. Warm up the engine.

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

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


      Powertrain > Engine and ECT > Utility
      Tester Display
      All Readiness

    12. Input the DTC: P0300, P0301, P0302, P0303 or P0304.

    13. Check the DTC judgment result.

      Result
      Result Proceed to

      NORMAL

      (DTCs are not output)

      		 A

      ABNORMAL

      (DTC P0300, P0301, P0302, P0303 or P0304 is output)

      		 B

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    GO TO STEP 27 Click here

  16. CHECK INTAKE SYSTEM


    1. Check the intake system for vacuum leaks.

      Click here

      OK
      No leaks from intake system.

      Tech Tips

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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE INTAKE SYSTEM

    OK

  17. CHECK FUEL PRESSURE


    1. Check the fuel pressure.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    CHECK FUEL LINE Click here

    OK

  18. READ VALUE USING GTS (COOLANT TEMP)

    Result
    Proceed to
    OK
    NG

    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

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


      Powertrain > Engine and ECT > Data List
      Tester Display
      Coolant Temp

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

      Standard
      GTS Display Condition Specified Condition
      Coolant Temp Cold engine Same as ambient air temperature
      Warm engine Between 75 and 100°C (167 and 212°F)

      Tech Tips

      Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    OK

  19. READ VALUE USING GTS (MAF)

    Result
    Proceed to
    OK
    NG

    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / MAF, Coolant Temp and Engine Speed.


      Powertrain > Engine and ECT > Data List
      Tester Display
      Engine Speed
      MAF
      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 3000 rpm.

      Standard
      GTS Display Condition Specified Condition
      MAF

      Shift lever position: N

      A/C: Off

      Engine Speed: 3000 rpm

      		 Between 3.0 gm/sec and 8.0 gm/sec
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 27 Click here

    OK

  20. INSPECT SPARK PLUG


    1. Inspect the spark plug of the misfiring cylinder.

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the spark plug.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SPARK PLUG Click here

    OK

  21. 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.

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

        Click here

      Result
      Proceed to
      NEXT

    NEXT

  22. CHECK CYLINDER COMPRESSION PRESSURE


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

      Click here

      Tech Tips

      Perform "Inspection After Repair" after repairing or replacing the engine assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

    OK

  23. CHECK TERMINAL VOLTAGE (#10, #20, #30 AND/OR #40)


    1. B0057IXC90
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C65-98 (#10) - C65-57 (E01) Engine switch on (IG) 11 to 14 V
      C65-95 (#20) - C65-57 (E01) Engine switch on (IG) 11 to 14 V
      C65-96 (#30) - C65-57 (E01) Engine switch on (IG) 11 to 14 V
      C65-97 (#40) - C65-57 (E01) Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK FUEL INJECTOR CIRCUIT Click here

    OK

  24. 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 Repair" after replacing the fuel injector assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FUEL INJECTOR ASSEMBLY Click here

    OK

  25. CHECK ENGINE MECHANICAL SYSTEM


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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

    OK

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


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

    6. Turn the engine switch on (IG).

    7. Turn the GTS on.

    8. Start the engine.

    9. Warm up the engine.

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

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


      Powertrain > Engine and ECT > Utility
      Tester Display
      All Readiness

    12. Input the DTC: P0300, P0301, P0302, P0303 or P0304.

    13. Check the DTC judgment result.

      Result
      Result Proceed to

      ABNORMAL

      (DTC P0300, P0301, P0302, P0303 or P0304 is output)

      		 A

      NORMAL

      (DTCs are not output)

      		 B

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  27. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)


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

      Click here

      Tech Tips

      Repair any problems.

      Result
      Proceed to
      NEXT

    NEXT

  28. CHECK WHETHER DTC OUTPUT RECURS (MISFIRE DTCS)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

    6. Turn the engine switch on (IG).

    7. Turn the GTS on.

    8. Start the engine.

    9. Warm up the engine.

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

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


      Powertrain > Engine and ECT > Utility
      Tester Display
      All Readiness

    12. Input the DTC: P0300, P0301, P0302, P0303 or P0304.

    13. Check the DTC judgment result.

      Result
      Result Proceed to

      ABNORMAL

      (DTC P0300, P0301, P0302, P0303 or P0304 is output)

      		 A

      NORMAL

      (DTCs are not output)

      		 B

    B

    END

    A

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

    Result
    Proceed to
    OK
    NG

    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
      Tester Connection Condition Specified Condition
      C1-5 (VG) - C65-137 (VG) Always Below 1 Ω
      C1-4 (E2G) - C65-104 (E2G) Always Below 1 Ω
      C1-5 (VG) or C65-137 (VG) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  30. 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 13 and 19 indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly.

      • Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

        Click here

      Result
      Proceed to
      NEXT

    NEXT

  31. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

    6. Turn the engine switch on (IG).

    7. Turn the GTS on.

    8. Start the engine.

    9. Warm up the engine.

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

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


      Powertrain > Engine and ECT > Utility
      Tester Display
      All Readiness

    12. Input the DTC: P0300, P0301, P0302, P0303 or P0304.

    13. Check the DTC judgment result.

      Result
      Result Proceed to

      NORMAL

      (DTCs are not output)

      		 A

      ABNORMAL

      (DTC P0300, P0301, P0302, P0303 or P0304 is output)

      		 B

    A

    END

    B

    REPLACE ECM Click here

  32. CHECK FUEL LINE


    1. Check the fuel lines for leaks or blockage.

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel pump.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FUEL PUMP Click here

    NG

    REPAIR OR REPLACE FUEL LINE