Dtc P0300 Random / Multiple Cylinder Misfire Detected

Двигатель. Toyota Rav4. Aca30, 33, 38 Ala30
Система Управления Двигателем 2Az-Fe. Toyota Rav4. Aca30, 33, 38 Ala30

DESCRIPTION

WIRING DIAGRAM

CONFIRMATION DRIVING PATTERN

INSPECTION PROCEDURE

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

READ VALUE OF INTELLIGENT TESTER (MISFIRE RPM AND MISFIRE LOAD)

CHECK VENTILATION HOSE CONNECTIONS

CHECK MISFIRE COUNT (CYLINDER #1, #2, #3 AND #4)

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (FUEL CUT #1 TO #4)

CHECK SPARK PLUG

CHECK FOR SPARKS AND IGNITION

CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

CHECK NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER

INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30 AND/OR #40 VOLTAGE)

CHECK HARNESS AND CONNECTOR (INJECTOR - ECM)

CHECK FUEL INJECTOR OF MISFIRING CYLINDER

CHECK VALVE CLEARANCE OF MISFIRING CYLINDER

CHECK AIR INDUCTION SYSTEM

READ VALUE OF VALVE TIMING

CHECK FUEL PRESSURE

READ VALUE OF INTELLIGENT TESTER (COOLANT TEMP)

READ VALUE OF INTELLIGENT TESTER (MAF)

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

Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi. Dtc P0300 Random / Multiple Cylinder Misfire Detected
When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely high HC concentration levels can cause increases in exhaust emission levels. High concentrations of HC can also cause increases in the Three-Way Catalytic Converter (TWC) temperature, which may cause damage to the TWC. To prevent these increases in emissions and to limit the possibility of thermal damage, the ECM monitors the misfire rate. When the temperature of the TWC reaches the point of thermal degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the Camshaft Position (CMP) sensor and the Crankshaft Position (CKP) sensor. The CMP sensor is used to identify any misfiring cylinders and the CKP sensor is used to measure variations in the crankshaft rotation speed. Misfires are counted as when the crankshaft rotation speed variations exceed predetermined thresholds.
If the misfire rate exceeds the threshold level, and could cause emission deterioration, the ECM illuminates the MIL and sets a DTC.

DTC No.
DTC Detection Condition
Trouble Area
P0300
Simultaneous misfiring of several cylinders detected
(2 trip detection logic)
  1. Open or short in engine wire harness
  2. Connector connection
  3. Vacuum hose connections
  4. Ignition system
  5. Injector
  6. Fuel pressure
  7. Mass Air Flow (MAF) meter
  8. Engine Coolant Temperature (ECT) sensor
  9. Compression pressure
  10. Valve clearance
  11. Valve timing
  12. Ventilation valve and hose
  13. Ventilation hose connections
  14. Air induction system
  15. ECM
P0301
P0302
P0303
P0304
Misfiring of specific cylinder detected
(2 trip detection logic)
When DTCs for misfiring cylinders are randomly set, but DTC P0300 is not set, it indicates that misfires have been detected in different cylinders at different times. DTC P0300 is only set when several misfiring cylinders are detected at the same time.

WIRING DIAGRAM

Wiring diagram of the ignition system.

Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi. Dtc P0300 Random / Multiple Cylinder Misfire Detected

Wiring diagram of the injector circuit.

Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi. Dtc P0300 Random / Multiple Cylinder Misfire Detected


CONFIRMATION DRIVING PATTERN

  1. Connect the intelligent tester to the DLC3.
  2. Turn the ignition switch on (IG) and turn the tester ON.
  3. Record the DTC(s) and freeze frame data.
  4. Using the tester, switch the ECM from normal mode to check mode (see page RAV4_ACA30 RM000000PDL018X.html).
  5. Read the misfire counts of each cylinder (CYL #1 to #4) with the engine in an idling condition. If any misfire count is displayed, skip the following confirmation driving pattern.
  6. Drive the vehicle several times with the conditions, such as engine rpm and engine load, shown in Misfire RPM and Misfire Load in the Data List.

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

    Engine RPM
    		Duration
    Idling
    		3 minutes 30 seconds or more
    1,000
    		3 minutes or more
    2,000
    		1 minute 30 seconds or more
    3,000
    		1 minute or more
  7. Check whether misfires have occurred by checking DTCs and freeze frame data.
    УКАЗАНИЕ:
    Do not turn the ignition switch off until the stored DTC(s) and freeze frame data have been recorded. When the ECM returns to normal mode (default), the stored DTC(s), freeze frame data and other data will be erased.
  8. Record the DTC(s), freeze frame data and misfire counts.
  9. Turn the ignition switch off and wait for at least 5 seconds.

INSPECTION PROCEDURE

УКАЗАНИЕ:
  1. If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
  2. Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. 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.
  3. If the misfire does not recur when the vehicle is brought to the workshop, reproduce the conditions stored in the freeze frame data.
  4. If the misfire still cannot be reproduced even though the conditions stored in the freeze frame data have been duplicated, one of the following factors is considered to be a possible cause of the problem:
    1. The fuel level is low.
    2. Improper fuel is used.
    3. The spark plugs are dirty.
    4. The problem is complex and involves multiple factors.
  5. After finishing repairs, check that no misfire occur in each cylinder (Cylinder #1, #2, #3 and #4).
  6. Be sure to confirm that no misfiring cylinder DTCs are set again by conducting the confirmation driving pattern, after the repairs.
  7. For 6 and 8 cylinder engines, the ECM intentionally does not set the specific misfiring cylinder DTCs at high engine RPM. If misfires only occur during high engine RPM driving, only DTC P0300 is set.
    In the event of DTC P0300 being present, perform the following operations:
    1. Clear the DTC (see page RAV4_ACA30 RM000000PDK013X.html).
    2. Start the engine and conduct the confirmation driving pattern.
    3. Read the misfiring rates of each cylinder or DTC(s) using the tester.
    4. Repair the cylinder(s) that has a high misfiring rate or is indicated by the DTC.
    5. After finishing repairs, conduct the confirmation driving pattern again, in order to verify that DTC P0300 is not set.
  8. When either Short FT #1 or Long FT #1 in the freeze frame data is outside the range of +-20%, the air-fuel ratio may be rich (-20% or less) or lean (+20% or more).
  9. When the Coolant Temp in the freeze frame data is less than 75°C (167°F), the misfires occurred only while warming up the engine.
1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE DTCS)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester ON.

  1. Select the following menu items: Powertrain / Engine and ECT / DTC.

  1. Read DTCs.

    Result:
    Display (DTC Output)
    		Proceed to
    P0300, P0301, P0302, P0303 and/or P0304
    		A
    P0300, P0301, P0302, P0303 and/or P0304 and other DTCs
    		B
УКАЗАНИЕ:
If any DTCs other than P0300, P0301, P0302, P0303 and P0304 are output, troubleshoot those DTCs first.


B
GO TO DTC CHART
A


2.READ VALUE OF INTELLIGENT TESTER (MISFIRE RPM AND MISFIRE LOAD)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester ON.

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / Misfire RPM and Misfire Load.

  1. Read and note the Misfire RPM and Misfire Load (engine load) values.

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

NEXT


3.CHECK VENTILATION HOSE CONNECTIONS
OK:
Ventilation hose is connected correctly and is not damaged.


NG
REPAIR OR REPLACE VENTILATION HOSE
OK


4.CHECK MISFIRE COUNT (CYLINDER #1, #2, #3 AND #4)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester ON.

  1. Clear DTCs (see page RAV4_ACA30 RM000000PDK013X.html).

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / Cylinder #1 to #4 Misfire Rate.

  1. Allow the engine to idle.

  1. Read each value for Cylinder #1 to #4 Misfire Rate displayed on the tester. If no misfire counts occur in any cylinders, perform the following procedures:

    1. Shift the gear selector lever to the D position.

    2. Check the Cylinder #1 to #4 Misfire Rate.

    3. If misfire counts are still not displayed, perform steps (g) and (h) and then check the misfire counts again.

  1. Drive the vehicle with the Misfire RPM and Misfire Load noted in "READ VALUE USING INTELLIGENT TESTER (MISFIRE RPM AND MISFIRE LOAD)" procedures above.

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

    Result:
    Misfire Count
    		Proceed to
    Most misfire occur in only 1 or 2 cylinders
    		A
    3 cylinders or more have equal misfire counts
    		B
    УКАЗАНИЕ:
    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's record of the ECT is below 75°C (167°F), the misfire may be detected only when the engine is cold.
    3. If the freeze frame data's record of the Engine Run Time is below 120 seconds, the misfire may be detected immediately after the engine is started.


B
Перейдите к шагу 14
A


5.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (FUEL CUT #1 TO #4)

  1. Allow the engine to idle.

  1. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the Cylinder #1 to #4 Fuel Cut.

  1. If a cylinder has a high misfire count, cut fuel to the cylinder. Compare the misfire count of the cylinder before fuel cut and after fuel cut.

    Result:
    Misfire Count in Each Cylinder
    		Proceed to
    Misfire count of cylinder before fuel cut and after fuel cut roughly same
    		A
    Misfire count of cylinder before fuel cut lower than after fuel cut
    		B
    ПРИМЕЧАНИЕ:
    This Active Test cannot be performed while the vehicle is being driven.
    УКАЗАНИЕ:
    If the misfire count of the cylinder before and after the fuel cut are roughly the same, the cylinder is misfiring.
    If the misfire count of the cylinder before the fuel cut is lower than after the fuel cut, the cylinder misfires sometimes.


B
Перейдите к шагу 11
A


6.CHECK SPARK PLUG
Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi. Dtc P0300 Random / Multiple Cylinder Misfire Detected

  1. Remove the ignition coil and the spark plug of the misfiring cylinder.

  1. Measure the spark plug electrode gap.

    Standard gap:
    0.7 to 0.8 mm (0.028 to 0.032 in.)

  1. Check the electrode for carbon deposits.

    Recommended spark plug:
    Manufacturers
    		Product
    DENSO
    		SK20R11
    NGK
    		IFR6A11
    ПРИМЕЧАНИЕ:
    If the electrode gap is larger than standard, replace the spark plug. Do not adjust the electrode gap.

  1. Reinstall the ignition coil and the spark plug.



NG
REPLACE SPARK PLUG
OK


7.CHECK FOR SPARKS AND IGNITION
Toyota Rav4. Aca30, 33, 38 Ala30

  1. Remove the ignition coil from the cylinder head.

  1. Install the spark plug onto the ignition coil.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester ON.

  1. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the All Cylinder Fuel Cut.

  1. Attach the spark plug assembly to the cylinder head.

  1. Perform the Control the All Cylinder Fuel Cut operation (press the RIGHT or LEFT button to change the ON).

    ПРИМЕЧАНИЕ:
    When Control the All Cylinder Fuel Cut is OFF and the engine is cranked, fuel injection will occur.

  1. Crank the engine for the less than 2 seconds and check the spark.

    OK:
    Sparks jump across electrode gap.

  1. Install the ignition coil.



NG
Перейдите к шагу 9
OK


8.CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

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



OK
Перейдите к шагу 10
NG

CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

9.CHECK NORMAL 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.

    ПРЕДОСТЕРЕЖЕНИЕ:
    Always disconnect all injector connectors.
    ПРИМЕЧАНИЕ:
    Do not crank the engine for more than 2 seconds.

    1. Install the spark plug to the ignition coil and connect the ignition coil connector.

    2. Disconnect the injector connector.

    3. Ground the spark plug.

    4. Check if sparks occur while the engine is being cranked.

      OK:
      Sparks jump across electrode gap.


NG
REPLACE IGNITION COIL ASSEMBLY THEN CONFIRM THAT THERE IS NO MISFIRE
OK

REPLACE SPARK PLUG

10.INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30 AND/OR #40 VOLTAGE)


    Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi. Dtc P0300 Random / Multiple Cylinder Misfire Detected

  1. Disconnect the B32 ECM connector.

  1. Turn the ignition switch on (IG).

  1. Measure the voltage between the terminals of the ECM connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    #10 (B32-108) - E01 (B32-45)
    		9 to 14 V
    #20 (B32-107) - E01 (B32-45)
    #30 (B32-106) - E01 (B32-45)
    #40 (B32-105) - E01 (B32-45)

  1. Reconnect the ECM connector.



OK
Перейдите к шагу 12
NG


11.CHECK HARNESS AND CONNECTOR (INJECTOR - ECM)
Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi. Dtc P0300 Random / Multiple Cylinder Misfire Detected

  1. Disconnect the injector connector (of the misfiring cylinder).

  1. Disconnect the B32 ECM connector.

  1. Turn the ignition switch on (IG).

  1. Measure the resistance and voltage between the injector and the ECM connector terminals.

    Standard voltage:
    Cylinder
    		Tester Connection
    		Specified Condition
    No. 1
    		B13-1 - Body ground
    		11 to 14 V
    No. 2
    		B14-1 - Body ground
    No. 3
    		B15-1 - Body ground
    No. 4
    		B16-1 - Body ground
    Standard resistance:
    Cylinder
    		Tester Connection
    		Specified Condition
    No. 1
    		B13-2 - Body ground
    		10 kΩ or higher
    B13-2 - #10 (B32-108)
    		Below 1 Ω
    No. 2
    		B14-2 - Body ground
    		10 kΩ or higher
    B14-2 - #20 (B32-107)
    		Below 1 Ω
    No. 3
    		B15-2 - Body ground
    		10 kΩ or higher
    B15-2 - #30 (B32-106)
    		Below 1 Ω
    No. 4
    		B16-2 - Body ground
    		10 kΩ or higher
    B16-2 - #40 (B32-105)
    		Below 1 Ω

  1. Reconnect the injector connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


12.CHECK FUEL INJECTOR OF MISFIRING CYLINDER

  1. Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor).



NG
REPLACE FUEL INJECTOR ASSEMBLY
OK


13.CHECK VALVE CLEARANCE OF MISFIRING CYLINDER


NG
ADJUST VALVE CLEARANCE
OK


14.CHECK AIR INDUCTION SYSTEM

  1. Check the air induction system for vacuum leakage.

    OK:
    No leakage from air induction system.


NG
REPAIR OR REPLACE AIR INDUCTION SYSTEM
OK


15.READ VALUE OF VALVE TIMING


    Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi. Dtc P0300 Random / Multiple Cylinder Misfire Detected

  1. Remove the cylinder head cover.

  1. Turn the crankshaft pulley, and align its groove with the timing mark "0" on the timing chain cover.

  1. Check that the timing marks on the camshaft timing sprocket and camshaft timing gear are facing upward as shown in the illustration.

    1. If not, turn the crankshaft 1 revolution (360°), then align the marks as above.
    OK:
    Timing marks on camshaft timing gears are aligned as shown in the illustration.

  1. Reinstall the cylinder head cover.



NG
ADJUST VALVE TIMING
OK


16.CHECK FUEL PRESSURE

  1. Check the fuel pressure (see page RAV4_ACA30 RM000000VZW00AX.html).

Standard pressure:
304 to 343 kPa (3.1 to 3.5 kgf/cm2, 44.1 to 49.7 psi)


NG
CHECK AND REPLACE FUEL PUMP, PRESSURE REGULATOR, FUEL PIPE LINE AND FILTER
OK


17.READ VALUE OF INTELLIGENT TESTER (COOLANT TEMP)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester ON.

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.

  1. Read the value displayed on the tester.

    Standard:
    Between 80°C and 100°C (176°F and 212°F) with warm engine.
    Result:
    Temperature Displayed
    		Proceed to
    -40°C (-40°F)
    		A
    140°C (284°F) or higher
    		B
    Between 80°C and 100°C (176°F and 212°F)
    		C
    УКАЗАНИЕ:
    1. If there is an open circuit, the intelligent tester indicates -40°C (-40°F).
    1. If there is a short circuit, the intelligent tester indicates 140°C (284°F) or higher.


NG
REPLACE ENGINE COOLANT TEMPERATURE SENSOR
OK


18.READ VALUE OF INTELLIGENT TESTER (MAF)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine and turn the tester ON.

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / MAF.

  1. Read the values displayed on the tester.

    Result:
    Mass Air Flow Rate (g/sec.)
    		Proceed to
    0.0
    		A
    271.0 or more
    		B
    Between 1.0 and 270.0 (*1)
    		C
    *1: The value must change when the throttle valve is open or closed with the engine running.


NG
REPLACE MASS AIR FLOW METER
OK

CHECK FOR INTERMITTENT PROBLEMS