SFI SYSTEM, Diagnostic DTC:P030000,P030027,P030085,P030100,P030200,P030300 and P030400

DTC Code DTC Name
P030000 Random/Multiple Cylinder Misfire Detected
P030027 Random/Multiple Cylinder Misfire Detected (Emission) Signal Rate of Change Above Threshold
P030085 Random / Multiple Cylinder Misfire Detected (Over Temperature) Signal Above Allowable Range
P030100 Cylinder 1 Misfire Detected
P030200 Cylinder 2 Misfire Detected
P030300 Cylinder 3 Misfire Detected
P030400 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

Note

P030000

Random/Multiple Cylinder Misfire Detected

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 immediately when detected).

  • 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

  • PCV system

  • Intake system

  • ECM

Comes on/Blinks*

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

DTC stored

SAE Code:

P0300

P030027

Random/Multiple Cylinder Misfire Detected (Emission) Signal Rate of Change Above Threshold

An emission deterioration misfire occurs (2 trip detection logic).

  • 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

  • PCV system

  • Intake system

  • ECM

Comes on

DTC stored

SAE Code:

-

P030085

Random / Multiple Cylinder Misfire Detected (Over Temperature) Signal Above Allowable Range

A misfire occurs that may damage the three-way catalytic converter (2 trip detection logic).

  • 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

  • PCV system

  • Intake system

  • ECM

Comes on/Blinks*

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

DTC stored

SAE Code:

-

P030100

Cylinder 1 Misfire Detected

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 immediately when detected).

  • 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

  • PCV system

  • Intake system

  • ECM

Comes on/Blinks*

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

DTC stored

SAE Code:

P0301

P030200

Cylinder 2 Misfire Detected

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 immediately when detected).

  • 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

  • PCV system

  • Intake system

  • ECM

Comes on/Blinks*

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

DTC stored

SAE Code:

P0302

P030300

Cylinder 3 Misfire Detected

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 immediately when detected).

  • 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

  • PCV system

  • Intake system

  • ECM

Comes on/Blinks*

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

DTC stored

SAE Code:

P0303

P030400

Cylinder 4 Misfire Detected

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 immediately when detected).

  • 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

  • PCV system

  • Intake system

  • ECM

Comes on/Blinks*

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

DTC stored

SAE Code:

P0304

When DTCs for misfiring cylinders are randomly stored, but DTC P030000 is not stored, it indicates that misfires have been detected in different cylinders at different times. DTC P030000 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 condition, which could cause emission deterioration, is detected (2 trip detection logic).

  • An excessive number of misfires (approximately 10 to 70 misfires per 1000 crankshaft revolutions) occurs a total of 4 times.

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

  • In every 200 crankshaft revolutions, the threshold misfiring percentage is recorded 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)

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 ignition switch to ON.

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

    Click here

  7. Start the engine.

  8. Read the misfire counts of each cylinder, Misfire Count Cylinder #1 to Misfire Count Cylinder #4, 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

    8 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 DTCs and Freeze Frame Data.

    Tip:

    Do not turn the ignition 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 ignition 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 P010012 for the mass air flow meter sub-assembly 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.

  • Check the "Fuel Cut Elapsed 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.

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

  • 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 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 (Misfire Count Cylinder #1 to Misfire Count Cylinder #4).

  • 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 B1S1 or Long FT B1S1 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 Temperature in the Freeze Frame Data is less than 75°C (167°F), the misfires have occurred only while warming up the engine.

  • Vehicle body vibration caused by an extremely imbalanced drive wheel 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 ignition switch to ON.

    3. Turn the GTS on.

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

    5. Read the DTCs.

      Powertrain > Engine > Trouble Codes

      Result

      Result

      Proceed to

      DTC P030000, P030027, P030085, P030100, P030200, P030300 and/or P030400 are output

      A

      DTC P030000, P030027, P030085, P030100, P030200, P030300 and/or P030400 and other DTCs are output

      B
      Tip:

      If any DTCs other than P030000, P030027, P030085, P030100, P030200, P030300 and/or P030400 are output, troubleshoot those DTCs first.

    B

    GO TO DTC CHART

    Click here

    A

  2. CHECK PCV SYSTEM

    1. Check the PCV hose connections.

      OK

      PCV valve and PCV system are correctly connected and are not damaged.

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE PCV SYSTEM

    OK

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

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

      Powertrain > Engine > 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 (CATALYST OT MISFIRE FUEL CUT)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / Catalyst OT Misfire Fuel Cut.

      Powertrain > Engine > Data List

      Tester Display

      Catalyst OT Misfire Fuel Cut

    5. Read the value displayed on the GTS.

      Result

      Data List

      Result

      Proceed to

      Catalyst OT Misfire Fuel Cut

      Avail

      A

      Not Avl

      B
    B

    CHECK MISFIRE COUNTClick here

    A

  5. PERFORM ACTIVE TEST USING GTS (PROHIBIT THE CATALYST OT MISFIRE PREVENT FUEL CUT)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Active Test / Prohibit the Catalyst OT Misfire Prevent Fuel Cut.

      Powertrain > Engine > Active Test

      Tester Display

      Prohibit the Catalyst OT Misfire Prevent Fuel Cut

    5. 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.

    Result

    Proceed to

    NEXT
    NEXT

  6. CHECK MISFIRE COUNT

    1. Start the engine.

    2. Enter the following menus: Powertrain / Engine / Data List / Misfire Count Cylinder #1 to Misfire Count Cylinder #4.

      Powertrain > Engine > Data List

      Tester Display

      Misfire Count Cylinder #1

      Misfire Count Cylinder #2

      Misfire Count Cylinder #3

      Misfire Count Cylinder #4

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

      1. 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].

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

    Result

    Misfire Count

    Proceed to

    1 or 2 cylinders have misfire counts

    A

    3 cylinders or more have misfire counts

    B
    B

    CHECK INTAKE SYSTEMClick here

    A

  7. 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

    Click here

    OK

  8. CHECK FOR SPARK (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 replacing the ignition coil assembly.

        Click here

    Result

    Proceed to

    NEXT
    NEXT

  9. INSPECT FUEL INJECTOR ASSEMBLY

    1. Check the resistance of the fuel injector assembly.

      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

    Click here

    OK

  10. 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

  11. CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE)

    1. Check the fuel pressure (for low pressure side).

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    CHECK FURL PUMP OPERATION (FOR LOW PRESSURE SIDE)Click here

    OK

  12. READ VALUE USING GTS (HIGH FUEL PRESSURE SENSOR)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Start the engine and warm it up.

    5. Enter the following menus: Powertrain / Engine / Data List / High Fuel Pressure Sensor.

      Powertrain > Engine > Data List

      Tester Display

      High Fuel Pressure Sensor

    6. Read the values.

      Standard

      GTS Display

      Condition

      Specified Condition

      High Fuel Pressure Sensor

      Shift lever position: P or neutral

      A/C: Off

      Engine idling

      2.3 to 30 MPa

      Shift lever position: P or neutral

      A/C: Off

      Engine speed: 3000 rpm

      2.3 to 30 MPa

    Result

    Proceed to

    OK

    NG
    NG

    CHECK AND REPLACE FUEL SYSTEM (FOR HIGH PRESSURE SIDE)

    OK

  13. 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

  14. READ VALUE USING GTS (COOLANT TEMPERATURE)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

      Powertrain > Engine > Data List

      Tester Display

      Coolant Temperature

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

      Standard

      GTS Display

      Condition

      Specified Condition

      Coolant Temperature

      Cold engine

      Same as ambient air temperature

      Warm engine

      Between 75 and 100°C (167 and 212°F)
      Tip:

      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

  15. READ VALUE USING GTS (MASS AIR FLOW SENSOR)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Start the engine.

    4. Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Mass Air Flow Sensor and Coolant Temperature.

      Powertrain > Engine > Data List

      Tester Display

      Engine Speed

      Mass Air Flow Sensor

      Coolant Temperature

    5. Allow the engine to idle until Coolant Temperature reaches 75°C (167°F) or higher.

    6. Read Mass Air Flow Sensor with the engine speed at 3000 rpm.

      Standard

      GTS Display

      Condition

      Specified Condition

      Mass Air Flow Sensor

      Shift lever position: P or neutral

      A/C: Off

      Engine Speed: 3000 rpm

      Between 4.0 and 14.0 gm/sec

    Result

    Proceed to

    OK

    NG
    NG

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

    OK

  16. 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

  17. CHECK WHETHER DTC OUTPUT RECURS (MISFIRE DTCS)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs

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

    6. Turn the ignition switch to ON.

    7. Turn the GTS on.

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

    9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

      Powertrain > Engine > Utility

      Tester Display

      All Readiness

    10. Input the DTC: P030000, P030027, P030085, P030100, P030200, P030300 or P030400.

    11. Check the DTC judgment result.

      Result

      Result

      Proceed to

      ABNORMAL

      (DTC P030000, P030027, P030085, P030100, P030200, P030300 and/or P030400 are output)

      A

      NORMAL

      (DTCs are not output)

      B
    A

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

    B

    CHECK FOR INTERMITTENT PROBLEMS

    Click here

  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 (FOR LOW PRESSURE SIDE)

    1. Check the fuel pressure (for low pressure side).

      Click here

    Result

    Proceed to

    OK

    NG
    NG

    CHECK FURL PUMP OPERATION (FOR LOW PRESSURE SIDE)Click here

    OK

  20. READ VALUE USING GTS (HIGH FUEL PRESSURE SENSOR)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Start the engine and warm it up.

    5. Enter the following menus: Powertrain / Engine / Data List / High Fuel Pressure Sensor.

      Powertrain > Engine > Data List

      Tester Display

      High Fuel Pressure Sensor

    6. Read the values.

      Standard

      GTS Display

      Condition

      Specified Condition

      High Fuel Pressure Sensor

      Shift lever position: P or neutral

      A/C: Off

      Engine idling

      2.3 to 30 MPa

      Shift lever position: P or neutral

      A/C: Off

      Engine speed: 3000 rpm

      2.3 to 30 MPa

    Result

    Proceed to

    OK

    NG
    NG

    CHECK AND REPLACE FUEL SYSTEM (FOR HIGH PRESSURE SIDE)

    OK

  21. READ VALUE USING GTS (COOLANT TEMPERATURE)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

      Powertrain > Engine > Data List

      Tester Display

      Coolant Temperature

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

      Standard

      GTS Display

      Condition

      Specified Condition

      Coolant Temperature

      Cold engine

      Same as ambient air temperature

      Warm engine

      Between 75 and 100°C (167 and 212°F)
      Tip:

      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

  22. READ VALUE USING GTS (MASS AIR FLOW SENSOR)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON and turn the GTS on.

    3. Start the engine.

    4. Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Mass Air Flow Sensor and Coolant Temperature.

      Powertrain > Engine > Data List

      Tester Display

      Engine Speed

      Mass Air Flow Sensor

      Coolant Temperature

    5. Allow the engine to idle until Coolant Temperature reaches 75°C (167°F) or higher.

    6. Read Mass Air Flow Sensor with the engine speed at 3000 rpm.

      Standard

      GTS Display

      Condition

      Specified Condition

      Mass Air Flow Sensor

      Shift lever position: P or neutral

      A/C: Off

      Engine Speed: 3000 rpm

      Between 4.0 and 14.0 gm/sec

    Result

    Proceed to

    OK

    NG
    NG

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

    OK

  23. 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

    Click here

    OK

  24. CHECK FOR SPARK (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 replacing the ignition coil assembly.

        Click here

    Result

    Proceed to

    NEXT
    NEXT

  25. 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

  26. INSPECT FUEL INJECTOR ASSEMBLY

    1. Check the resistance of the fuel injector assembly.

      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

    Click here

    OK

  27. 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

  28. CHECK WHETHER DTC OUTPUT RECURS (MISFIRE DTCS)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs

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

    6. Turn the ignition switch to ON.

    7. Turn the GTS on.

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

    9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

      Powertrain > Engine > Utility

      Tester Display

      All Readiness

    10. Input the DTC: P030000, P030027, P030085, P030100, P030200, P030300 or P030400.

    11. Check the DTC judgment result.

      Result

      Result

      Proceed to

      ABNORMAL

      (DTC P030000, P030027, P030085, P030100, P030200, P030300 and/or P030400 are output)

      A

      NORMAL

      (DTCs are not output)

      B
    B

    CHECK FOR INTERMITTENT PROBLEMS

    Click here

    A

  29. 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

  30. CHECK WHETHER DTC OUTPUT RECURS (MISFIRE DTCS)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs

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

    6. Turn the ignition switch to ON.

    7. Turn the GTS on.

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

    9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

      Powertrain > Engine > Utility

      Tester Display

      All Readiness

    10. Input the DTC: P030000, P030027, P030085, P030100, P030200, P030300 or P030400.

    11. Check the DTC judgment result.

      Result

      Result

      Proceed to

      ABNORMAL

      (DTC P030000, P030027, P030085, P030100, P030200, P030300 and/or P030400 are output)

      A

      NORMAL

      (DTCs are not output)

      B
    B

    END

    A

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

    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

      B2-3 (VG) - B208-92 (VG)

      Always

      Below 1 Ω

      B2-2 (E2G) - B208-91 (E2G)

      Always

      Below 1 Ω

      B2-3 (VG) or B208-92 (VG) - Body ground and other terminals

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  32. 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 step 15 or 22 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

  33. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

      Powertrain > Engine > Clear DTCs

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

    6. Turn the ignition switch to ON.

    7. Turn the GTS on.

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

    9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

      Powertrain > Engine > Utility

      Tester Display

      All Readiness

    10. Input the DTC: P030000, P030027, P030085, P030100, P030200, P030300 or P030400.

    11. Check the DTC judgment result.

      Result

      Result

      Proceed to

      ABNORMAL

      (DTC P030000, P030027, P030085, P030100, P030200, P030300 and/or P030400 are output)

      A

      NORMAL

      (DTCs are not output)

      B
    A

    REPLACE ECM

    Click here

    B

    END

  34. CHECK FURL PUMP OPERATION (FOR LOW PRESSURE SIDE)

    1. Check the fuel pump operation (for low pressure side).

      Click here

    Result

    Proceed to

    OK

    NG
    OK

    CHECK AND REPLACE FUEL SYSTEM (PRESSURE REGULATOR, PIPE LINE AND FILTER)

    NG

    CHECK FUEL PUMP CONTROL CIRCUIT

    Click here