SFI SYSTEM(w/ EGR System), Diagnostic DTC:P0300,P0301,P0302,P0303 and 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

  • EGR valve assembly

  • 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

  • EGR valve assembly

  • 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

  • EGR valve assembly

  • 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

  • EGR valve assembly

  • 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

  • EGR valve assembly

  • 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 either one of the following conditions, which could cause emission deterioration, is detected (2 trip detection logic).

  • An excessive misfiring rate (approximately 10 to 50 misfires per 1000 crankshaft revolutions) occurs a total of 4 times.

The ECM flashes the MIL (immediately detection logic) and stores a DTC (2 trip detection logic) 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.

  • A sufficient amount of misfires to damage the catalyst occurring within 200 crankshaft revolutions is detected 3 times.

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

Table 1. Misfire

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)

Table 2. Monitor Period of Emission-related Misfire

Duration

Crankshaft 1000 revolutions x 4

Table 3. 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 power 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. Put the engine in inspection mode (maintenance mode).

    Click here

  7. Using the GTS, switch the ECM from normal mode to check mode.

    Click here

  8. 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.

  9. 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.

    Tip:

    In order to store misfire DTCs, it is necessary to operate the vehicle for the period of time shown in the table below, confirm the Misfire RPM and Misfire Load in the Data List.

    Engine speed

    Duration

    Idling

    4.5 minutes or more

    1000

    4.5 minutes or more

    2000

    2.5 minutes or more

    3000

    1.5 minutes or more

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

    Tip:

    Do not turn the power switch off until the output 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 are cleared.

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

  12. Turn the power switch off and wait for at least 30 seconds.

  13. 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.

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

  • 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 +/-20%, the air fuel ratio may be rich (-20% or less) or lean (+20% 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.

  • 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.

PROCEDURE

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

    1. Connect the GTS to the DLC3.

    2. Turn the power 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

      Tip:

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

    B

    GO TO DTC CHART

    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 power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Ptrl Misfire / 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.

      Tip:

      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 power switch on (IG).

    3. Turn the GTS on.

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

      Click here

      Powertrain > Hybrid Control > Utility

      Tester Display

      Inspection Mode

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / Ptrl Misfire / 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

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

    7. 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.

    8. 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].

    9. 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

      Tip:
      • 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 less than 75°C (167°F), the misfire may be detected only when the engine is cold.

    B

    CHECK INTAKE SYSTEMClick here

    A
  5. INSPECT SPARK PLUG

    1. Inspect the spark plug of the misfiring cylinder.

      Click here

      Tip:

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

      Click here

    Result

    Proceed to

    OK

    NG

    NG

    REPLACE SPARK PLUG

    OK
  6. CHECK FOR SPARKS (SPARK TEST)

    1. Perform a spark test.

      Click here

      Tip:
      • 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

      Tip:

      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)

    C328784C12

    *a

    Front view of wire harness connector

    (to ECM)

    1. 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

      Condition

      Specified Condition

      B75-20 (#10) - B75-50 (E01)

      Power switch on (IG)

      11 to 14 V

      B75-17 (#20) - B75-50 (E01)

      Power switch on (IG)

      11 to 14 V

      B75-18 (#30) - B75-50 (E01)

      Power switch on (IG)

      11 to 14 V

      B75-19 (#40) - B75-50 (E01)

      Power switch on (IG)

      11 to 14 V

    Result

    Proceed to

    OK

    NG

    NG

    CHECK FUEL INJECTOR CIRCUIT

    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

      Tip:

      Perform "Inspection After Repair" after replacing the fuel injector assembly.

      Click here

    Result

    Proceed to

    OK

    NG

    NG

    REPLACE FUEL INJECTOR ASSEMBLY

    OK
  10. CHECK INTAKE SYSTEM

    1. Check the intake system for vacuum leaks.

      Click here

      OK

      No leaks from intake system.

      Tip:

      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

    CHECK FUEL LINEClick here

    OK
  12. READ VALUE USING GTS (COOLANT TEMP)

    Click here

    Result

    Proceed to

    OK

    NG

    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR

    OK
  13. READ VALUE USING GTS (MAF)

    Click here

    Result

    Proceed to

    OK

    NG

    NG

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)Click here

    OK
  14. CHECK VALVE TIMING

    Click here

    Result

    Proceed to

    OK

    NG

    NG

    CHECK ENGINE MECHANICAL SYSTEMClick here

    OK
  15. PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

      Click here

      Powertrain > Hybrid Control > Utility

      Tester Display

      Inspection Mode

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

      Tip:

      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 / Primary / MAP and Throttle Idle Position.

      Powertrain > Engine and ECT > Active Test

      Active Test Display

      Control the EGR Step Position

      Data List Display

      MAP

      Throttle Idle Position

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

      Tip:
      • 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

      Tip:
      • 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

    Proceed to

    OK

    NG

    OK

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)Click here

    NG
  16. 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.

      Tip:

      Perform "Inspection After Repair" after replacing the EGR valve assembly.

      Click here

    Result

    Proceed to

    OK

    NG

    OK

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)Click here

    NG

    REPLACE EGR VALVE ASSEMBLY

  17. 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.

    Result

    Proceed to

    OK

    NG

    OK

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)Click here

    NG

    REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

  18. CHECK INTAKE SYSTEM

    1. Check the intake system for vacuum leaks.

      Click here

      OK

      No leaks from intake system.

      Tip:

      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
  19. CHECK FUEL PRESSURE

    1. Check the fuel pressure.

      Click here

    Result

    Proceed to

    OK

    NG

    NG

    CHECK FUEL LINEClick here

    OK
  20. READ VALUE USING GTS (COOLANT TEMP)

    Click here

    Result

    Proceed to

    OK

    NG

    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR

    OK
  21. READ VALUE USING GTS (MAF)

    Click here

    Result

    Proceed to

    OK

    NG

    NG

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)Click here

    OK
  22. CHECK VALVE TIMING

    Click here

    Result

    Proceed to

    OK

    NG

    NG

    CHECK ENGINE MECHANICAL SYSTEMClick here

    OK
  23. PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

      Click here

      Powertrain > Hybrid Control > Utility

      Tester Display

      Inspection Mode

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

      Tip:

      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 / Primary / MAP and Throttle Idle Position.

      Powertrain > Engine and ECT > Active Test

      Active Test Display

      Control the EGR Step Position

      Data List Display

      MAP

      Throttle Idle Position

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

      Tip:
      • 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

      Tip:
      • 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

    Proceed to

    OK

    NG

    OK

    INSPECT SPARK PLUGClick here

    NG
  24. 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.

      Tip:

      Perform "Inspection After Repair" after replacing the EGR valve assembly.

      Click here

    Result

    Proceed to

    OK

    NG

    NG

    REPLACE EGR VALVE ASSEMBLY

    OK
  25. INSPECT SPARK PLUG

    1. Inspect the spark plug of the misfiring cylinder.

      Click here

      Tip:

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

      Click here

    Result

    Proceed to

    OK

    NG

    NG

    REPLACE SPARK PLUG

    OK
  26. CHECK FOR SPARKS (SPARK TEST)

    1. Perform a spark test.

      Click here

      Tip:
      • 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
  27. CHECK CYLINDER COMPRESSION PRESSURE

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

      Click here

      Tip:

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

    C328784C12

    *a

    Front view of wire harness connector

    (to ECM)

    1. 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

      Condition

      Specified Condition

      B75-20 (#10) - B75-50 (E01)

      Power switch on (IG)

      11 to 14 V

      B75-17 (#20) - B75-50 (E01)

      Power switch on (IG)

      11 to 14 V

      B75-18 (#30) - B75-50 (E01)

      Power switch on (IG)

      11 to 14 V

      B75-19 (#40) - B75-50 (E01)

      Power switch on (IG)

      11 to 14 V

    Result

    Proceed to

    OK

    NG

    NG

    CHECK FUEL INJECTOR CIRCUIT

    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

      Tip:

      Perform "Inspection After Repair" after replacing the fuel injector assembly.

      Click here

    Result

    Proceed to

    OK

    NG

    OK

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)Click here

    NG

    REPLACE FUEL INJECTOR ASSEMBLY

  30. 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.

    Result

    Proceed to

    OK

    NG

    NG

    REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

    OK
  31. 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

      Tip:

      Repair any problems.

    Result

    Proceed to

    NEXT

    NEXT
  32. CHECK WHETHER DTC OUTPUT RECURS (MISFIRE DTCS)

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.

      Click here

      Powertrain > Engine and ECT > Clear DTCs

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

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

    7. Put the engine in inspection mode (maintenance mode).

      Click here

      Powertrain > Hybrid Control > Utility

      Tester Display

      Inspection Mode

    8. Start the engine and warm it up.

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

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

      Powertrain > Engine and ECT > Utility

      Tester Display

      All Readiness

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

    12. Check the DTC judgment result.

      Result

      Result

      Proceed to

      ABNORMAL

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

      A

      NORMAL

      (DTCs are not output)

      B

    B

    END

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

    Click here

    Result

    Proceed to

    OK

    NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK
  34. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

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

      Click here

      Tip:
      • If the results of the inspections performed in steps 13 and 21 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
  35. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.

      Click here

      Powertrain > Engine and ECT > Clear DTCs

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

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

    7. Put the engine in inspection mode (maintenance mode).

      Click here

      Powertrain > Hybrid Control > Utility

      Tester Display

      Inspection Mode

    8. Start the engine and warm it up.

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

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

      Powertrain > Engine and ECT > Utility

      Tester Display

      All Readiness

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

    12. Check the DTC judgment result.

      Result

      Result

      Proceed to

      NORMAL

      (DTCs are not output)

      A

      ABNORMAL

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

      B

    A

    END

    B

    REPLACE ECM

  36. CHECK FUEL LINE

    1. Check the fuel lines for leaks or blockage.

      Tip:

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

      Click here

    Result

    Proceed to

    OK

    NG

    OK

    REPLACE FUEL PUMP

    NG

    REPAIR OR REPLACE FUEL LINE