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.

A004AB4E03
DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0300 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

  • Fuel line

  • Fuel pump

  • Mass air flow meter

  • Engine coolant temperature sensor

  • Compression pressure

  • Valve timing

  • PCV valve and hose

  • PCV hose connections

  • Intake system

  • EGR valve assembly

  • ECM

Comes on/Blinks*


  • (Euro-OBD) / -(Expect Euro-OBD)

    *: 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 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

  • Fuel line

  • Fuel pump

  • Mass air flow meter

  • Engine coolant temperature sensor

  • Compression pressure

  • Valve timing

  • PCV valve and hose

  • PCV hose connections

  • Intake system

  • EGR valve assembly

  • ECM

Comes on/Blinks*


  • (Euro-OBD) / -(Expect Euro-OBD)

    *: 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 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

  • Fuel line

  • Fuel pump

  • Mass air flow meter

  • Engine coolant temperature sensor

  • Compression pressure

  • Valve timing

  • PCV valve and hose

  • PCV hose connections

  • Intake system

  • EGR valve assembly

  • ECM

Comes on/Blinks*


  • (Euro-OBD) / -(Expect Euro-OBD)

    *: 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 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

  • Fuel line

  • Fuel pump

  • Mass air flow meter

  • Engine coolant temperature sensor

  • Compression pressure

  • Valve timing

  • PCV valve and hose

  • PCV hose connections

  • Intake system

  • EGR valve assembly

  • ECM

Comes on/Blinks*


  • (Euro-OBD) / -(Expect Euro-OBD)

    *: 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 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

  • Fuel line

  • Fuel pump

  • Mass air flow meter

  • Engine coolant temperature sensor

  • Compression pressure

  • Valve timing

  • PCV valve and hose

  • PCV hose connections

  • Intake system

  • EGR valve assembly

  • ECM

Comes on/Blinks*


  • (Euro-OBD) / -(Expect Euro-OBD)

    *: 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 condition, which could cause emission deterioration, is detected (2 trip detection logic).


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.


MONITOR STRATEGY

Required Sensors/Components (Main)

Crankshaft position sensor

Camshaft position sensor

Required Sensors/Components (Related)

Engine coolant temperature sensor

Intake air temperature sensor

Mass air flow meter

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 1000 crankshaft revolutions x 4
Monitor Period of Catalyst-damaging Misfire (MIL Blinks)
Duration 200 crankshaft 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. Read the misfire counts of each cylinder, Cylinder #1 Misfire Count to Cylinder #4 Misfire Count, with the engine idling. If any misfire count is displayed, skip the following confirmation driving pattern.

  8. Drive the vehicle 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, confirm the Misfire RPM and Misfire Load in the Data List.

    Engine speed 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 DTCs and freeze frame data.

    Tech Tips

    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.

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

  11. Turn the ignition 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.

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


  • 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, 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 (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 B1S1 or Long FT B1S1 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 below 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.

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

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

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

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


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

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

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 and ECT / Trouble Codes.

    5. Read the DTCs.

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

      Tech Tips

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


    B
    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
    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 and ECT / Data List / Misfire RPM and Misfire Load.

    5. Read and note the Misfire RPM and Misfire Load values.

      Tech Tips

      The Misfire RPM and Misfire Load values indicate the vehicle conditions under which the misfire occurred.

      Result
      Proceed to
      NEXT

    NEXT
  4. READ FREEZE FRAME DATA


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

      Click here

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

    B
    A
  5. INSPECT SPARK PLUG


    1. Inspect the spark plug of the misfiring cylinder.

      Click here

      Tech Tips


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

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

        Click here

      Result
      Proceed to
      OK
      NG

    NG
    OK
  6. CHECK FOR SPARK (SPARK TEST)


    1. Perform a spark test.

      Click here

      Tech Tips


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

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

        Click here

      Result
      Proceed to
      NEXT

    NEXT
  7. PERFORM ACTIVE TEST USING GTS (PROHIBIT THE CATALYST OT MISFIRE PREVENT F/C)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Prohibit the Catalyst OT Misfire prevent F/C.

    6. Perform the Active Test.

      Note

      When performing the Active Test, make sure the vehicle is stopped and the engine is either idling or being revved within 3000 rpm.

      Result
      Proceed to
      NEXT

    NEXT
  8. READ VALUE USING GTS (CYLINDER MISFIRE COUNT)


    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 and ECT / Data List / Cylinder #1 Misfire Count, Cylinder #2 Misfire Count, Cylinder #3 Misfire Count and 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.


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

      CAUTION:

      When performing the confirmation driving pattern, obey all speed limits and traffic laws.

      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.

      Result
      Result Proceed to
      Most misfires occur in only 1 or 2 cylinders A
      3 cylinders or more have equal misfire counts B

    B
    A
  9. 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
    OK
  10. CHECK FOR SPARK (SPARK TEST)


    1. Perform a spark test.

      Click here

      Tech Tips


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

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

        Click here

      Result
      Proceed to
      NEXT

    NEXT
  11. CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER


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

    A0049R2C02
    *A for LHD *B for RHD
    *a

    Front view of wire harness connector

    (to ECM)

    - -

    1. Disconnect the B112 ECM connector.*1

    2. Disconnect the B118 ECM connector.*2

    3. Turn the ignition switch to ON.

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


      • *1: for LHD

      • *2: for RHD

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      B112-98 (#10) - B112-57 (E01) Ignition switch ON 11 to 14 V
      B112-95 (#20) - B112-57 (E01) Ignition switch ON 11 to 14 V
      B112-96 (#30) - B112-57 (E01) Ignition switch ON 11 to 14 V
      B112-97 (#40) - B112-57 (E01) Ignition switch ON 11 to 14 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      B118-98 (#10) - B118-57 (E01) Ignition switch ON 11 to 14 V
      B118-95 (#20) - B118-57 (E01) Ignition switch ON 11 to 14 V
      B118-96 (#30) - B118-57 (E01) Ignition switch ON 11 to 14 V
      B118-97 (#40) - B118-57 (E01) Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG
    OK
  13. 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
    OK
  14. 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
    OK
  15. CHECK FUEL PRESSURE


    1. Check the fuel pressure.

      Click here

      Result
      Proceed to
      OK
      NG

    NG
    OK
  16. READ VALUE USING GTS (COOLANT TEMP)


    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 and ECT / Data List / 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
    OK
  17. READ VALUE USING GTS (MAF)


    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 / Engine Speed, MAF and 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: P or N (neutral)

      A/C: off

      Engine Speed: 3000 rpm

      Between 3.0 gm/sec and 9.0 gm/sec
      Result
      Proceed to
      OK
      NG

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


    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 until the engine coolant temperature reaches 75°C (167°F) or higher.

      Tech Tips

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

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / MAP and Throttle Idle Position.

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

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

      MAP

      (Data List)

      MAP value is 20 to 48 kPa(abs)

      [150 to 360 mmHg(abs)]

      (EGR valve is fully closed)

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

      Note


      • 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.

      Tech Tips

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

      Result
      Proceed to
      OK
      NG

    OK
    NG
  19. 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.

      Tech Tips

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

      Click here

      Result
      Proceed to
      OK
      NG

    NG
    OK
  20. CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH)

    Result
    Proceed to
    OK
    NG

    1. Remove the cylinder head cover sub-assembly.

      A0049J5C09
      *a Timing Mark *b Timing Notch (Groove)
      *c Protrusion - -
    2. Turn the crankshaft pulley and align its groove with the "0" timing mark of the timing chain cover.

    3. Check that the timing marks of the camshaft timing gear assembly and camshaft timing exhaust gear assembly are at the positions shown in the illustration.

      Tech Tips

      If the timing marks are not at the positions shown, turn the crankshaft one revolution clockwise.

      OK
      Timing marks on camshaft timing gear assembly and camshaft timing exhaust gear assembly are at the positions shown in the illustration.

      Tech Tips


      • If the result is not as specified, check for mechanical malfunctions that may have affected the valve timing, such as a jumped tooth or stretching of the timing chain.

      • Perform "Inspection After Repair" after removing the cam timing control motor with EDU.

      Result
      Proceed to
      OK
      NG

    OK
    NG
  21. 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
    OK
  22. CHECK FUEL PRESSURE


    1. Check the fuel pressure.

      Click here

      Result
      Proceed to
      OK
      NG

    NG
    OK
  23. READ VALUE USING GTS (COOLANT TEMP)


    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 and ECT / Data List / 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
    OK
  24. READ VALUE USING GTS (MAF)


    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 / Engine Speed, MAF and 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: P or N (neutral)

      A/C: off

      Engine Speed: 3000 rpm

      Between 3.0 gm/sec and 9.0 gm/sec
      Result
      Proceed to
      OK
      NG

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


    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 until the engine coolant temperature reaches 75°C (167°F) or higher.

      Tech Tips

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

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / MAP and Throttle Idle Position.

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

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

      MAP

      (Data List)

      MAP value is 20 to 48 kPa(abs)

      [150 to 360 mmHg(abs)]

      (EGR valve is fully closed)

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

      Note


      • 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.

      Tech Tips

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

      Result
      Proceed to
      OK
      NG

    OK
    NG
  26. 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.

      Tech Tips

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

      Click here

      Result
      Proceed to
      OK
      NG

    NG
    OK
  27. INSPECT SPARK PLUG


    1. Remove the No. 1 ignition coil and the spark plug from the misfiring cylinder.

    2. 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
    OK
  28. CHECK FOR SPARK (SPARK TEST)


    1. Perform a spark test.

      Click here

      Tech Tips


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

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

        Click here

      Result
      Proceed to
      NEXT

    NEXT
  29. CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER


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

    A0049R2C02
    *A for LHD *B for RHD
    *a

    Front view of wire harness connector

    (to ECM)

    - -

    1. Disconnect the B112 ECM connector.*1

    2. Disconnect the B118 ECM connector.*2

    3. Turn the ignition switch to ON.

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


      • *1: for LHD

      • *2: for RHD

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      B112-98 (#10) - B112-57 (E01) Ignition switch ON 11 to 14 V
      B112-95 (#20) - B112-57 (E01) Ignition switch ON 11 to 14 V
      B112-96 (#30) - B112-57 (E01) Ignition switch ON 11 to 14 V
      B112-97 (#40) - B112-57 (E01) Ignition switch ON 11 to 14 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      B118-98 (#10) - B118-57 (E01) Ignition switch ON 11 to 14 V
      B118-95 (#20) - B118-57 (E01) Ignition switch ON 11 to 14 V
      B118-96 (#30) - B118-57 (E01) Ignition switch ON 11 to 14 V
      B118-97 (#40) - B118-57 (E01) Ignition switch ON 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG
    OK
  31. CHECK FUEL INJECTOR 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
    OK
  32. CHECK VALVE TIMING (CHECK FOR LOOSE TIMING CHAIN AND JUMPED TEETH)

    Result
    Proceed to
    OK
    NG

    1. Remove the cylinder head cover sub-assembly.

      A0049J5C09
      *a Timing Mark *b Timing Notch (Groove)
      *c Protrusion - -
    2. Turn the crankshaft pulley and align its groove with the "0" timing mark of the timing chain cover.

    3. Check that the timing marks of the camshaft timing gear assembly and camshaft timing exhaust gear assembly are at the positions shown in the illustration.

      Tech Tips

      If the timing marks are not at the positions shown, turn the crankshaft one revolution clockwise.

      OK
      Timing marks on camshaft timing gear assembly and camshaft timing exhaust gear assembly are at the positions shown in the illustration.

      Tech Tips


      • If the result is not as specified, check for mechanical malfunctions that may have affected the valve timing, such as a jumped tooth or stretching of the timing chain.

      • Perform "Inspection After Repair" after removing the cam timing control motor with EDU.

      Result
      Proceed to
      OK
      NG

    OK
    NG
  33. 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
    OK
  34. 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.

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

    6. Start the engine and warm it up.

    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 and ECT / Utility / All Readiness.

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

    11. 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
    B
  35. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER CONNECTOR CONNECTION)


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

      Click here

      Tech Tips

      Repair any problems.

      Result
      Proceed to
      NEXT

    NEXT
  36. 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.

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

    6. Start the engine and warm it up.

    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 and ECT / Utility / All Readiness.

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

    11. 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
    B
  37. INSPECT FUEL PUMP


    1. Inspect the fuel pump.

      Click here

      Tech Tips

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

      Click here

      Result
      Proceed to
      OK
      NG

    OK
    NG
  38. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)

    Result
    Proceed to
    OK
    NG

    1. Disconnect the B112 ECM connector.*1

    2. Disconnect the B118 ECM connector.*2

    3. Disconnect the A28 mass air flow meter connector.

    4. Measure the resistance according to the value(s) in the table below.

      *1: for LHD

      *2: for RHD

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      B112-137 (VG) - A28-5 (VG) Always Below 1 Ω
      B112-104 (E2G) - A28-4 (E2G) Always Below 1 Ω
      B112-137 (VG) or A28-5 (VG) - Body ground and other terminals Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      B118-137 (VG) - A28-5 (VG) Always Below 1 Ω
      B118-104 (E2G) - A28-4 (E2G) Always Below 1 Ω
      B118-137 (VG) or A28-5 (VG) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  39. REPLACE MASS AIR FLOW METER


    1. Replace the mass air flow meter.

      Click here

      Tech Tips


      • If the results of the inspections performed in steps 17 and 24 indicated no problem, proceed to the next step without replacing the mass air flow meter.

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

        Click here

      Result
      Proceed to
      NEXT

    NEXT
  40. 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.

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

    6. Start the engine and warm it up.

    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 and ECT / Utility / All Readiness.

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

    11. 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
    B