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P0300 P0301 P0302 P0303 P0304

DTC    P0300    Random / Multiple Cylinder Misfire Detected

DTC    P0301    Cylinder 1 Misfire Detected

DTC    P0302    Cylinder 2 Misfire Detected

DTC    P0303    Cylinder 3 Misfire Detected

DTC    P0304    Cylinder 4 Misfire Detected


 

DESCRIPTION

When the engine misfires, high concentrations of hydrocarbon (HC) enter the exhaust gas. High HC concentration levels can cause an increase in exhaust emission levels. Extremely high concentrations of HC 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 rate. When the temperature of the three-way catalytic converter reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the camshaft position sensor and the crankshaft position sensor. The camshaft position sensor is used to identify any misfiring cylinders and the crankshaft position sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted when the crankshaft rotation speed variations exceed predetermined thresholds. If the misfire count exceeds the threshold levels, and could cause emission control system performance deterioration, the ECM illuminates the MIL and sets a DTC.
 

DTC No. DTC Detection Condition Trouble Area
P0300 Simultaneous misfiring of several cylinders occurs and one of the following conditions below is detected (2 trip detection logic):
  1. High temperature misfire occurs in three-way catalytic converter (MIL blinks)
  2. Emission deterioration misfire occurs (MIL illuminates)
  1. Open or short in engine wire harness
  2. Connector connection
  3. Vacuum hose connections
  4. Ignition system
  5. Fuel injector assembly
  6. Fuel pressure
  7. Mass air flow meter sub-assembly
  8. Engine coolant temperature sensor
  9. Compression pressure
  10. Valve timing
  11. PCV valve and hose
  12. PCV hose connections
  13. Intake system
  14. EGR valve assembly
  15. ECM
P0301
P0302
P0303
P0304
Misfiring of a specific cylinder occurs and one of the following conditions below is detected (2 trip detection logic):
  1. High temperature misfire occurs in three-way catalytic converter (MIL blinks)
  2. Emission deterioration misfire occurs (MIL illuminates)

When multiple DTCs for misfiring cylinders are 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 sets a DTC when the following conditions, which could cause emission control system performance deterioration, is detected (2 trip detection logic).

  1. An excessive misfiring rate (approximately 20 to 50 misfires per 1000 crankshaft revolutions) occurs a total of 4 times.

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

HINT:

If a catalyst damage misfire occurs, the monitor informs the driver by blinking the MIL (1 trip).

 

  1. A sufficient amount of misfire 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 sensor
Intake air temperature sensor
Mass air flow meter sub-assembly
Frequency of Operation Continuous


 

TYPICAL ENABLING CONDITIONS

 

Misfire 
Either of the following conditions (a) or (b) is met -
(a) Engine coolant temperature at engine start Higher than -7°C (19°F)
(b) Engine coolant temperature Higher than 20°C (68°F)

 

Monitor Period of Emission-Related Misfire 
Duration Crankshaft 1000 revolutions x 4

 

Monitor Period of Catalyst Damaging Misfire (MIL Blinks) 
Duration Crankshaft 200 revolutions x 3


 

CONFIRMATION DRIVING PATTERN

  1. Connect the intelligent tester to the DLC3.
  2. Turn the power switch on (IG).
  3. Turn the tester on.
  4. Record the DTC(s) and freeze frame data.
  5. Switch the ECM from normal mode to check mode.
  6. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
  7. Put the engine in inspection mode (maintenance mode).
  8. 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.
  9. Drive the vehicle several times with the conditions, such as engine speed and engine load, as shown in Misfire RPM and Misfire Load in the freeze frame data.

    HINT:

    In order to store misfire DTCs, it is necessary to operate the vehicle for the period of time shown in the table below with the engine speed and engine load the same as Misfire RPM and Misfire Load in the freeze frame data.
     
    Engine Speed Duration
    Idling 4 minutes or more
    1000 4 minutes and 30 seconds or more
    2000 2 minutes and 30 seconds or more
    3000 1 minute and 30 seconds or more

     

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

    HINT:

    Do not turn the power switch off until the stored DTCs and freeze frame data have been recorded. When the ECM returns to normal mode (default), the stored DTCs, freeze frame data and other data will be cleared.

     

  11. Record the DTCs, 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 operation).


 

WIRING DIAGRAM

Fuel injector circuit: Refer to Fuel Injector Circuit.
Mass air flow meter sub-assembly circuit: Refer to DTC P0102.

 

INSPECTION PROCEDURE

HINT:

  1. If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
  2. Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
  3. 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.
  4. 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 may be a cause of the problem:
    1. The fuel level is low.
    2. Improper fuel is being used.
    3. The spark plugs are dirty.
  5. After finishing repairs, check that no misfires occur in each cylinder (Cylinder No. 1, No. 2, No. 3 and No. 4).
  6. Be sure to confirm that no misfiring cylinder DTCs are stored again by conducting the confirmation driving pattern after the repairs.
  7. When one of Short FT #1or Long FT #1 in the freeze frame data is outside the range of +/-20%, the air fuel ratio may be Rich (-20% or less) or Lean (+20% or more).
  8. When the Coolant Temp in the freeze frame data is less than 75°C (167°F), the misfire has occurred only while warming up the engine.
  9. An extremely imbalanced drive wheel which causes body vibration may cause misfire DTCs to be stored.
1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE DTCS)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. 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

    HINT:

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.

    OK:

    PCV hose is connected correctly and is not damaged.
  NG
REPAIR OR REPLACE PCV HOSE
 
OK  
 

 

3.READ VALUE USING INTELLIGENT TESTER (MISFIRE RPM AND MISFIRE LOAD)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the tester on.

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

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

    HINT:

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

 

4.READ VALUE USING INTELLIGENT TESTER (CYLINDER #1 (TO #4) MISFIRE COUNT)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the tester on.

  1. Clear the DTCs.

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

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

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

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

  1. Drive the vehicle with the Misfire RPM and Misfire Load noted in the "Read Value Using Intelligent Tester (Misfire Rpm And Misfire Load)" procedures above.

  1. Read the Cylinder #1 Misfire Count to Cylinder #4 Misfire Count or DTCs displayed on the tester.
     

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

     

HINT:

  1. 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.
  2. If the freeze frame data record of the engine coolant temperature is below 75°C (167°F), it may only be possible to detect the misfire when the engine is cold.
  B
Go to step 19
 
A  
 

 

5.INSPECT SPARK PLUG
  1. Inspect the spark plug of the misfiring cylinder.

  NG
REPLACE SPARK PLUG
 
OK  
 

 

6.CHECK FOR SPARKS AND IGNITION
  1. Perform a spark test.

    CAUTION:

    Always disconnect all fuel injector assembly connectors.

    NOTICE:

    Do not crank the engine for more than 2 seconds.

    OK:

    Spark jumps across electrode gap.
  NG
Go to step 38
 
OK  
 

 

7.CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER
  1. Measure the cylinder compression pressure of the misfiring cylinder.

  NG
CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION
 
OK  
 

 

8.CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE VOLTAGE)


 

P0300 P0301 P0302 P0303 P0304 / Lexus CT200h / ZWA10
  1. Disconnect the fuel injector assembly connectors.

  1. Turn the power switch on (IG).

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

    Standard Voltage:

    Tester Connection Switch Condition Specified Condition
    D14-1 - Body ground Power switch on (IG) 11 to 14 V
    D15-1 - Body ground Power switch on (IG) 11 to 14 V
    D16-1 - Body ground Power switch on (IG) 11 to 14 V
    D17-1 - Body ground Power switch on (IG) 11 to 14 V

    Text in Illustration 

    *a Front view of wire harness connector
    (to Fuel Injector Assembly)
  NG
GO TO FUEL INJECTOR CIRCUIT
 
OK  
 

 

9.CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)
  1. Disconnect the fuel injector assembly connectors.

  1. Disconnect the ECM connector.

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

    Standard Resistance:

     
    Tester Connection Condition Specified Condition
    D14-2 - D27-85 (#10) Always Below 1 Ω
    D15-2 - D27-84 (#20) Always Below 1 Ω
    D16-2 - D27-83 (#30) Always Below 1 Ω
    D17-2 - D27-82 (#40) Always Below 1 Ω
    D14-2 or D27-85 (#10) - Body ground Always 10 Ω or higher
    D15-2 or D27-84 (#20) - Body ground Always 10 Ω or higher
    D16-2 or D27-83 (#30) - Body ground Always 10 Ω or higher
    D17-2 or D27-82 (#40) - Body ground Always 10 Ω or higher
  NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
 
OK  
 

 

10.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).

  NG
REPLACE FUEL INJECTOR ASSEMBLY 
 
OK  
 

 

11.CHECK INTAKE SYSTEM
  1. Check the intake system for vacuum leaks.

    OK:

    No leaks in intake system.
  NG
REPAIR OR REPLACE INTAKE SYSTEM
 
OK  
 

 

12.CHECK FUEL PRESSURE
  1. Check the fuel pressure.

  NG
Go to step 40
 
OK  
 

 

13.READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the tester on.

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

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

    Standard 
    Tester Display Condition Specified Condition
    Coolant Temp Cold engine Same as ambient air temperature
    Warm engine Between 75 and 100°C (167 and 212°F)
  NG
REPLACE ENGINE COOLANT TEMPERATURE SENSOR 
 
OK  
 

 

14.READ VALUE USING INTELLIGENT TESTER (MAF)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the tester on.

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

  1. Start the engine.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / MAF and Coolant Temp.

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

  1. Read MAF with the engine speed at 2500 rpm.
     

    Standard 
    Tester Display Condition Specified Condition
    MAF Shift lever position: P
    Engine Speed: 2500 rpm
    Between 4.5 gm/sec. and 8.5 gm/sec.

     

 

  NG
Go to step 33
 
OK  
 

 

15.ADJUST VALVE TIMING
P0300 P0301 P0302 P0303 P0304 / Lexus CT200h / ZWA10

 

HINT:
 
There are no marks on the cylinder head to match-up for the purpose of checking valve timing. Valve timing can only be inspected by lining up the colored plates on the timing chain with the marks on the pulleys. It may be necessary to remove and reinstall the chain to match-up the alignment marks.

Text in Illustration 

*a Top
*b Alignment Mark
*c No. 1 Cylinder at TDC Compression

 

NEXT  
 

 

16.CHECK WHETHER DTC OUTPUT RECURS (P0300, P0301, P0302, P0303 OR P0304)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the tester on.

  1. Clear the DTCs.

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

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

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

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

  1. Check the DTC judgment result.

    Result 
    Result Proceed to
    ABNORMAL
    (DTC P0300, P0301, P0302, P0303 or P0304 is output)
    A
    NORMAL
    (DTC is not output)
    B
  B
END
 
A  
 

 

17.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE EGR STEP POSITION)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the tester on.

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

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

    HINT:

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

     

     

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

  1. 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.

    HINT:

    1. Do not leave the EGR valve open for 10 seconds or more during the Active Test.
    2. Be sure to return the EGR valve to step 0 when the Active Test is completed.
    3. Do not open the EGR valve 30 steps or more during the Active Test.

    OK:

    MAP and idling condition 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
    Idling condition Steady idling Idling changes from steady to rough idling or stalls
    MAP
    (Data List)
    MAP value is 20 to 40 kPa (150 to 300 mmHg)
    (EGR valve is fully closed)
    MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed

    HINT:

    During Active Test, if the idling condition does not change in response to EGR step position, then there is probably a malfunction in the EGR valve.
    Result 
    Result Proceed to
    Outside of standard range A
    Within standard range B
  B
Go to step 33
 
A  
 

 

18.INSPECT EGR VALVE ASSEMBLY
  1. Remove the EGR valve assembly.

  1. Check if the EGR valve is stuck open.

    OK:

    EGR valve is tightly closed.
    Result 
    Result Proceed to
    NG A
    OK B
  B
Go to step 33
 
A  
 
REPLACE EGR VALVE ASSEMBLY 

 

19.CHECK INTAKE SYSTEM
  1. Check the intake system for vacuum leaks.

    OK:

    No leaks in intake system.
  NG
REPAIR OR REPLACE INTAKE SYSTEM
 
OK  
 

 

20.CHECK FUEL PRESSURE
  1. Check the fuel pressure.

  NG
Go to step 40
 
OK  
 

 

21.READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the tester on.

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

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

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

     

 

  NG
REPLACE ENGINE COOLANT TEMPERATURE SENSOR 
 
OK  
 

 

22.READ VALUE USING INTELLIGENT TESTER (MAF)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the tester on.

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

  1. Start the engine.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / MAF and Coolant Temp.

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

  1. Read MAF with the engine speed at 2500 rpm.
     

    Standard 
    Tester Display Condition Specified Condition
    MAF Shift lever position: P
    Engine Speed: 2500 rpm
    Between 4.5 gm/sec. and 8.5 gm/sec.
  NG
Go to step 33
 
OK  
 

 

23.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE EGR STEP POSITION)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the tester on.

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

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

    HINT:

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

     

     

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

  1. 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.

    HINT:

    1. Do not leave the EGR valve open for 10 seconds or more during the Active Test.
    2. Be sure to return the EGR valve to step 0 when the Active Test is completed.
    3. Do not open the EGR valve 30 steps or more during the Active Test.

     

    OK:

    MAP and idling condition 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
    Idling condition Steady idling Idling changes from steady to rough idling or stalls
    MAP
    (Data List)
    MAP value is 20 to 40 kPa (150 to 300 mmHg)
    (EGR valve is fully closed)
    MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed

    HINT:

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

     

    Result 
    Result Proceed to
    Outside of standard range A
    Within standard range B
  B
Go to step 25
 
A  
 

 

24.INSPECT EGR VALVE ASSEMBLY
  1. Remove the EGR valve assembly.

  1. Check if the EGR valve is stuck open.

    OK:

    EGR valve is tightly closed.
  NG
REPLACE EGR VALVE ASSEMBLY 
 
OK  
 

 

25.INSPECT SPARK PLUG
  1. Inspect the spark plug of the misfiring cylinder.

 

  NG
REPLACE SPARK PLUG
 
OK  
 

 

26.CHECK FOR SPARKS AND IGNITION
  1. Perform a spark test.

    CAUTION:

    Always disconnect all fuel injector assembly connectors.

    NOTICE:

    Do not crank the engine for more than 2 seconds.

    OK:

    Spark jumps across electrode gap.
  NG
Go to step 38
 
OK  
 

 

27.CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER
  1. Measure the cylinder compression pressure of the misfiring cylinder .

  NG
CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION
 
OK  
 

 

28.CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE VOLTAGE)


 

P0300 P0301 P0302 P0303 P0304 / Lexus CT200h / ZWA10
  1. Disconnect the fuel injector assembly connectors.

  1. Turn the power switch on (IG).

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

     

    Standard Voltage:
    Tester Connection Switch Condition Specified Condition
    D14-1 - Body ground Power switch on (IG) 11 to 14 V
    D15-1 - Body ground Power switch on (IG) 11 to 14 V
    D16-1 - Body ground Power switch on (IG) 11 to 14 V
    D17-1 - Body ground Power switch on (IG) 11 to 14 V

     

    Text in Illustration 
    *a Front view of wire harness connector
    (to Fuel Injector Assembly)

     

 

  NG
GO TO FUEL INJECTOR CIRCUIT 
 
OK  
 

 

29.CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)
  1. Disconnect the fuel injector assembly connectors.

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.
    Standard Resistance:

     
    Tester Connection Condition Specified Condition
    D14-2 - D27-85 (#10) Always Below 1 Ω
    D15-2 - D27-84 (#20) Always Below 1 Ω
    D16-2 - D27-83 (#30) Always Below 1 Ω
    D17-2 - D27-82 (#40) Always Below 1 Ω
    D14-2 or D27-85 (#10) - Body ground Always 10 Ω or higher
    D15-2 or D27-84 (#20) - Body ground Always 10 Ω or higher
    D16-2 or D27-83 (#30) - Body ground Always 10 Ω or higher
    D17-2 or D27-82 (#40) - Body ground Always 10 Ω or higher
  NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
 
OK  
 

 

30.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).

 

  NG
REPLACE FUEL INJECTOR ASSEMBLY
 
OK  
 

 

31.ADJUST VALVE TIMING
P0300 P0301 P0302 P0303 P0304 / Lexus CT200h / ZWA10

HINT:

 
There are no marks on the cylinder head to match-up for the purpose of checking valve timing. Valve timing can only be inspected by lining up the colored plates on the timing chain with the marks on the pulleys. It may be necessary to remove and reinstall the chain to match-up the alignment marks.
Text in Illustration 
*a Top
*b Alignment Mark
*c No. 1 Cylinder at TDC Compression

 

NEXT  
 

 

32.CHECK WHETHER DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 OR P0304)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the tester on.

  1. Clear the DTCs.

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

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

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

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

  1. Check the DTC judgment result.
     

    Result 
    Result Proceed to
    ABNORMAL
    (DTC P0300, P0301, P0302, P0303 or P0304 is output)
    A
    NORMAL
    (DTC is not output)
    B
  B
END
 
A  
 

 

33.CHECK HARNESS AND CONNECTOR
  1. Check the connection and terminal contact pressure of the connectors and wire harness between the mass air flow meter sub-assembly and ECM.

    HINT:

    Repair any problems.
NEXT  
 

 

34.CHECK DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 OR P0304)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the tester on.

  1. Clear the DTCs.

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

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

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

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

  1. Check the DTC judgment result.
     

    Result 
    Result Proceed to
    ABNORMAL
    (DTC P0300, P0301, P0302, P0303 or P0304 is output)
    A
    NORMAL
    (DTC is not output)
    B
  B
END
 
A  
 

 

35.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)
  1. Disconnect the mass air flow meter sub-assembly connector.

  1. Disconnect the ECM connector.

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

     

    Standard Resistance:
     
    Tester Connection Condition Specified Condition
    D5-5 (VG) - D27-94 (VG) Always Below 1 Ω
    D5-4 (E2G) - D27-117 (E2G) Always Below 1 Ω
    D5-5 (VG) or D27-94 (VG) - Body ground Always 10 kΩ or higher
  NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
 
OK  
 

 

36.REPLACE MASS AIR FLOW METER SUB-ASSEMBLY
  1. Replace the mass air flow meter sub-assembly.

    HINT:

    If the result of the inspection performed in steps 14 and 22 indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly.
NEXT  
 

 

37.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the tester on.

  1. Clear the DTCs.

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

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

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

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

  1. Check the DTC judgment result.
     

    Result 
    Result Proceed to
    ABNORMAL
    (DTC P0300, P0301, P0302, P0303 or P0304 is output)
    A
    NORMAL
    (DTC is not output)
    B
  B
END
 
A  
 
REPLACE ECM 

 

38.CHANGE TO KNOWN GOOD SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER
  1. Change the installed spark plug to a spark plug that functions normally.

  1. Perform a spark test.

    CAUTION:

    Always disconnect all fuel injector assembly connectors.

    NOTICE:

    Do not crank the engine for more than 2 seconds.

    OK:

    Sparks jump across electrode gap.
  NG
Go to step 39
 
OK  
 
REPLACE SPARK PLUG 

 

39.CHANGE TO KNOWN GOOD IGNITION COIL ASSEMBLY AND CHECK SPARK OF MISFIRING CYLINDER
  1. Change the ignition coil assembly to an ignition coil assembly that functions normally.

  1. Perform a spark test.

    CAUTION:

    Always disconnect all fuel injector assembly connectors.

    NOTICE:

    Do not crank the engine for more than 2 seconds.

    OK:

    Sparks jump across electrode gap.
  NG
REPLACE ECM 
 
OK  
 
REPLACE IGNITION COIL ASSEMBLY 

 

40.CHECK FUEL LINE
  1. Check the fuel lines for leaks or blockage.

  NG
REPAIR OR REPLACE FUEL LINE
 
OK  
 
REPLACE FUEL PUMP