Dtc P0300 Random / Multiple Cylinder Misfire Detected

Engine. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
3Zr-Fae Engine Control System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

CONFIRMATION DRIVING PATTERN

INSPECTION PROCEDURE

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

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

CHECK PCV HOSE CONNECTIONS

READ VALUE USING INTELLIGENT TESTER (MISFIRE COUNT)

CHECK SPARK PLUG

CHECK FOR SPARK AND IGNITION

CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

CHECK INJECTOR ASSEMBLY (POWER SOURCE)

CHECK HARNESS AND CONNECTOR (INJECTOR ASSEMBLY - ECM)

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

CHECK FUEL INJECTOR OF MISFIRING CYLINDER

CHECK INTAKE SYSTEM

CHECK FUEL PRESSURE

READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)

INSPECT MASS AIR FLOW METER

ADJUST VALVE TIMING

CHECK WHETHER DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 AND/OR P0304)

CHECK INTAKE SYSTEM

CHECK FUEL PRESSURE

READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)

INSPECT MASS AIR FLOW METER

ADJUST VALVE TIMING

CHECK WHETHER DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 AND/OR P0304)

CHECK SPARK PLUG

CHECK FOR SPARK AND IGNITION (SPARK TEST)

CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

CHECK INJECTOR ASSEMBLY (POWER SOURCE)

CHECK HARNESS AND CONNECTOR (INJECTOR ASSEMBLY - ECM)

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

CHECK FUEL INJECTOR OF MISFIRING CYLINDER

REPLACE SPARK PLUG WITH NORMAL ONE AND CHECK SPARK OF MISFIRING CYLINDER

REPLACE IGNITION COIL WITH NORMAL ONE AND CHECK SPARK OF MISFIRING CYLINDER

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

CHECK FUEL LINE

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 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System. Dtc P0300 Random / Multiple Cylinder Misfire Detected
Text in Illustration
*1
VVT Sensor
*2
CKP Sensor
*3
ECM
When the engine misfires, high concentrations of hydrocarbons enter the exhaust gas. Extremely high hydrocarbon concentration levels can cause increases in exhaust emission levels. 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 these increases 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 rate exceeds the threshold level and could cause emission deterioration, the ECM illuminates the MIL and stores a DTC.

DTC No.
DTC Detection Condition
Trouble Area
P0300
Simultaneous misfiring of several cylinders is 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 meter
  8. Engine coolant temperature sensor
  9. Compression pressure
  10. Valve timing
  11. PCV valve and hose
  12. PCV hose connection
  13. Intake system
  14. ECM
P0301
P0302
P0303
P0304
Misfiring of a specific cylinder is detected (2 trip detection logic).
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.

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System. Dtc P0300 Random / Multiple Cylinder Misfire Detected


CONFIRMATION DRIVING PATTERN

  1. Connect the intelligent tester to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the tester on.
  4. Record the DTC(s) and freeze frame data.
  5. Using the tester, switch the ECM from normal mode to check mode (RAV4_ACA30 RM000000PDL0A2X.html).
  6. Read the misfire counts of each cylinder (Cylinder #1 to #4) with the engine idling. If any misfire count is displayed, skip the following confirmation driving pattern.
  7. If no misfire counts are displayed, drive the vehicle several times at the engine speed and engine load recorded in the freeze frame data.

    HINT:
    1. In order to detect misfire DTCs, drive the vehicle at the engine speed and engine load recorded in the freeze frame data for the time specified in the table below.

    Engine Speed
    		Duration
    Idling
    		8 minutes or more
    1000
    		4 minutes 30 seconds or more
    2000
    		2 minutes 30 seconds or more
    3000
    		1 minute 30 seconds or more
  8. Check whether misfires have occurred by checking DTCs and freeze frame data.
    HINT:
    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 cleared.
  9. Record the DTC(s), freeze frame data and misfire counts.
  10. Turn the ignition switch off and wait for 5 seconds.

INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following 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 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 occurs in each cylinder (Cylinder #1, #2, #3 and #4).
  6. Be sure to confirm that no misfiring cylinder DTCs are output again by conducting the confirmation driving pattern after the repairs.
  7. When either the Short FT #1 or Long FT #1 value in the freeze frame data is not within 20% of the central value, 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 below 75°C (167°F), the misfires occurred only while warming up the engine.
1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO MISFIRE CODES)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  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 P0304 are output, troubleshoot those DTCs first.


B
GO TO DTC CHART (RAV4_ACA30 RM000000PDF07OX.html)
A


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

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and turn the tester on.

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


3.CHECK PCV HOSE CONNECTIONS

  1. Check the PCV hose connections.

    OK:
    PCV hose is correctly connected and is not damaged.


NG
REPAIR OR REPLACE PCV HOSE
OK


4.READ VALUE USING INTELLIGENT TESTER (MISFIRE COUNT)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Drive the vehicle at the engine speed and engine load noted in the "Read Value Using Intelligent Tester (Misfire RPM and Misfire Load)" procedure above.

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

    Result
    Misfire Count
    		Proceed to
    Most misfires occur in only 1 or 2 cylinders, or misfire DTCs for only 1 or 2 cylinders are output
    		A
    3 cylinders or more have equal misfire counts, or misfire DTCs for 3 or more cylinders are output
    		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), the misfire may be detected only when the engine is cold.
    3. 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.


B
Go to step 18
A


5.CHECK SPARK PLUG

  1. Check the spark plug (RAV4_ACA30 RM000001EFG02EX_01_0002.html).



NG
REPLACE SPARK PLUG (RAV4_ACA30 RM000002YO400WX.html)
OK


6.CHECK FOR SPARK AND IGNITION


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

  1. Perform a spark test.

    CAUTION:
    During the test, disconnect all the fuel injector connectors.
    NOTICE:
    Do not crank the engine for more than 2 seconds.

    1. Remove the ignition coil from the cylinder head.

    2. Install the spark plug to the ignition coil.

    3. Disconnect the 4 fuel injector connectors.

    4. Touch the spark plug assembly to the cylinder head.

    5. Crank the engine for less than 2 seconds and check for sparks.

      OK:
      Sparks jump across electrode gap.

    6. Reconnect the 4 fuel injector connectors.

    7. Install the ignition coil.



NG
Go to step 31
OK


7.CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

  1. Measure the cylinder compression pressure of the misfiring cylinder (RAV4_ACA30 RM000002ZLZ00OX_01_0010.html).



NG
CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION
OK


8.CHECK INJECTOR ASSEMBLY (POWER SOURCE)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System. Dtc P0300 Random / Multiple Cylinder Misfire Detected

  1. Disconnect the injector assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    B16-1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    B15-1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    B14-1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    B13-1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *1
    		Front view of wire harness connector
    (to Fuel Injector)

  1. Reconnect the injector assembly connector.



NG
CHECK FUEL INJECTOR CIRCUIT (RAV4_ACA30 RM000000ZRM03ZX.html)
OK


9.CHECK HARNESS AND CONNECTOR (INJECTOR ASSEMBLY - ECM)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System. Dtc P0300 Random / Multiple Cylinder Misfire Detected

  1. Disconnect the injector assembly connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    B16-2 - B32-86 (#10)
    		Always
    		Below 1 Ω
    B15-2 - B32-85 (#20)
    		Always
    		Below 1 Ω
    B14-2 - B32-84 (#30)
    		Always
    		Below 1 Ω
    B13-2 - B32-83 (#40)
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    B16-2 or B32-86 (#10) - Body ground
    		Always
    		10 kΩ or higher
    B15-2 or B32-85 (#20) - Body ground
    		Always
    		10 kΩ or higher
    B14-2 or B32-84 (#30) - Body ground
    		Always
    		10 kΩ or higher
    B13-2 or B32-83 (#40) - Body ground
    		Always
    		10 kΩ or higher
    Text in Illustration
    *1
    		Front view of wire harness connector
    (to Fuel Injector)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the injector connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (INJECTOR ASSEMBLY - ECM)
OK


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


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System. Dtc P0300 Random / Multiple Cylinder Misfire Detected

  1. Disconnect the ECM connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    B32-86 (#10) - B32-46 (E01)
    		Ignition switch ON
    		11 to 14 V
    B32-85 (#20) - B32-46 (E01)
    		Ignition switch ON
    		11 to 14 V
    B32-84 (#30) - B32-46 (E01)
    		Ignition switch ON
    		11 to 14 V
    B32-83 (#40) - B32-46 (E01)
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *1
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the ECM connector.



NG
Go to step 33
OK


11.CHECK FUEL INJECTOR OF MISFIRING CYLINDER

  1. Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor) (RAV4_ACA30 RM000001EDQ01NX.html).



NG
REPLACE FUEL INJECTOR ASSEMBLY (RAV4_ACA30 RM000001EDS01DX.html)
OK


12.CHECK INTAKE SYSTEM

  1. Check the intake system for vacuum leakage (RAV4_ACA30 RM00000341000BX.html).

    OK:
    No leakage from intake system.


NG
REPAIR OR REPLACE INTAKE SYSTEM
OK


13.CHECK FUEL PRESSURE

  1. Check the fuel pressure (RAV4_ACA30 RM000001IQZ02QX_01_0002.html).



NG
Go to step 34
OK


14.READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Read the Coolant Temp twice, when the engine is both cold and warmed up.

    Standard temperature:
    With cold engine:
    Same as ambient air temperature.
    With warm engine:
    Between 75°C and 95°C (167°F and 203°F).


NG
REPLACE ENGINE COOLANT TEMPERATURE SENSOR (RAV4_ACA30 RM000002WSG00TX.html)
OK


15.INSPECT MASS AIR FLOW METER

  1. Inspect the mass air flow meter (RAV4_ACA30 RM000000VA5015X.html).



NG
REPLACE MASS AIR FLOW METER (RAV4_ACA30 RM000002WQT00SX.html)
OK


16.ADJUST VALVE TIMING
HINT:
There are no marks on the cylinder head to align for the purpose of checking valve timing. Valve timing can only be inspected by aligning the colored plates on the timing chain with the marks on the pulleys. It may be necessary to remove and reinstall the chain to align the timing marks (RAV4_ACA30 RM0000027I901JX_03_0377.html).

NEXT


17.CHECK WHETHER DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 AND/OR P0304)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Clear the DTCs (RAV4_ACA30 RM000000PDK0BLX.html).

  1. Start the engine and warm it up.

  1. Switch the ECM from normal mode to check mode using the tester.

  1. Run the engine at an engine speed of 1000 rpm for 4 minutes 30 seconds.

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

  1. Read the DTCs.

    Result
    Result
    		Proceed to
    DTC is not output
    		A
    DTC P0300, P0301, P0302, P0303 and/or P0304 are output
    		B


B
REPLACE ECM (RAV4_ACA30 RM0000017UO01KX.html)
A

SYSTEM IS OK

18.CHECK INTAKE SYSTEM

  1. Check the intake system for vacuum leakage (RAV4_ACA30 RM00000341000BX.html).

    OK:
    No leakage from intake system.


NG
REPAIR OR REPLACE INTAKE SYSTEM
OK


19.CHECK FUEL PRESSURE

  1. Check the fuel pressure (RAV4_ACA30 RM000001IQZ02QX_01_0002.html).



NG
Go to step 34
OK


20.READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Read the Coolant Temp twice, when the engine is both cold and warmed up.

    Standard temperature:
    With cold engine:
    Same as ambient air temperature.
    With warm engine:
    Between 75°C and 95°C (167°F and 203°F).


NG
REPLACE ENGINE COOLANT TEMPERATURE SENSOR (RAV4_ACA30 RM000002WSG00TX.html)
OK


21.INSPECT MASS AIR FLOW METER

  1. Inspect the mass air flow meter (RAV4_ACA30 RM000000VA5015X.html).



NG
REPLACE MASS AIR FLOW METER (RAV4_ACA30 RM000002WQT00SX.html)
OK


22.ADJUST VALVE TIMING
HINT:
There are no marks on the cylinder head to align for the purpose of checking valve timing. Valve timing can only be inspected by aligning the colored plates on the timing chain with the marks on the pulleys. It may be necessary to remove and reinstall the chain to align the timing marks (RAV4_ACA30 RM0000027I901JX_03_0377.html).

NEXT


23.CHECK WHETHER DTC OUTPUT RECURS (DTC P0300, P0301, P0302, P0303 AND/OR P0304)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Clear the DTCs (RAV4_ACA30 RM000000PDK0BLX.html).

  1. Start the engine and warm it up.

  1. Switch the ECM from normal mode to check mode using the tester.

  1. Run the engine at an engine speed of 1000 rpm for 4 minutes 30 seconds.

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

  1. Read the DTCs.

    Result
    Result
    		Proceed to
    DTC is not output
    		A
    DTC P0300, P0301, P0302, P0303 and/or P0304 is output
    		B


B
Go to step 24
A

SYSTEM IS OK

24.CHECK SPARK PLUG

  1. Check the spark plug (RAV4_ACA30 RM000001EFG02EX_01_0002.html).



NG
REPLACE SPARK PLUG (RAV4_ACA30 RM000002YO400WX.html)
OK


25.CHECK FOR SPARK AND IGNITION (SPARK TEST)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

  1. Perform a spark test.

    CAUTION:
    During the test, disconnect all fuel injector connectors.
    NOTICE:
    Do not crank the engine for more than 2 seconds.

    1. Remove the ignition coil from the cylinder head.

    2. Install the spark plug to the ignition coil.

    3. Disconnect the 4 fuel injector connectors.

    4. Touch the spark plug assembly to the cylinder head.

    5. Crank the engine for less than 2 seconds and check for sparks.

      OK:
      Sparks jump across electrode gap.

    6. Reconnect the 4 fuel injector connectors.

    7. Install the ignition coil.



NG
Go to step 31
OK


26.CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

  1. Measure the cylinder compression pressure of the misfiring cylinder (RAV4_ACA30 RM000002ZLZ00OX_01_0010.html).



NG
CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION
OK


27.CHECK INJECTOR ASSEMBLY (POWER SOURCE)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System. Dtc P0300 Random / Multiple Cylinder Misfire Detected

  1. Disconnect the injector assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    B16-1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    B15-1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    B14-1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    B13-1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *1
    		Front view of wire harness connector
    (to Fuel Injector)

  1. Reconnect the injector assembly connector.



NG
CHECK FUEL INJECTOR CIRCUIT (RAV4_ACA30 RM000000ZRM03ZX.html)
OK


28.CHECK HARNESS AND CONNECTOR (INJECTOR ASSEMBLY - ECM)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System. Dtc P0300 Random / Multiple Cylinder Misfire Detected

  1. Disconnect the injector assembly connector.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    B16-2 - B32-86 (#10)
    		Always
    		Below 1 Ω
    B15-2 - B32-85 (#20)
    		Always
    		Below 1 Ω
    B14-2 - B32-84 (#30)
    		Always
    		Below 1 Ω
    B13-2 - B32-83 (#40)
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    B16-2 or B32-86 (#10) - Body ground
    		Always
    		10 kΩ or higher
    B15-2 or B32-85 (#20) - Body ground
    		Always
    		10 kΩ or higher
    B14-2 or B32-84 (#30) - Body ground
    		Always
    		10 kΩ or higher
    B13-2 or B32-83 (#40) - Body ground
    		Always
    		10 kΩ or higher
    Text in Illustration
    *1
    		Front view of wire harness connector
    (to Fuel Injector)
    *2
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the injector connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (INJECTOR ASSEMBLY - ECM)
OK


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


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System. Dtc P0300 Random / Multiple Cylinder Misfire Detected

  1. Disconnect the ECM connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    B32-86 (#10) - B32-46 (E01)
    		Ignition switch ON
    		11 to 14 V
    B32-85 (#20) - B32-46 (E01)
    		Ignition switch ON
    		11 to 14 V
    B32-84 (#30) - B32-46 (E01)
    		Ignition switch ON
    		11 to 14 V
    B32-83 (#40) - B32-46 (E01)
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *1
    		Front view of wire harness connector
    (to ECM)

  1. Reconnect the ECM connector.



NG
Go to step 33
OK


30.CHECK FUEL INJECTOR OF MISFIRING CYLINDER

  1. Check the injector injection (whether fuel volume is high or low, and whether injection pattern is poor) (RAV4_ACA30 RM000001EDQ01NX.html).



NG
REPLACE FUEL INJECTOR ASSEMBLY (RAV4_ACA30 RM000001EDS01DX.html)
OK

REPLACE ECM (RAV4_ACA30 RM0000017UO01KX.html)

31.REPLACE SPARK PLUG WITH NORMAL ONE AND CHECK SPARK OF MISFIRING CYLINDER

  1. Replace the installed spark plug with a spark plug that functions normally.

  1. Perform a spark test.

    CAUTION:
    During the test, disconnect all the injector connectors.
    NOTICE:
    Do not crank the engine for more than 2 seconds.

    1. Install the spark plug to the ignition coil.

    2. Disconnect the 4 fuel injector connectors.

    3. Touch the spark plug assembly to the cylinder head.

    4. Crank the engine for less than 2 seconds and check for sparks.

      OK:
      Sparks jump across electrode gap.


NG
Go to step 32
OK

REPLACE SPARK PLUG (RAV4_ACA30 RM000002YO400WX.html)

32.REPLACE IGNITION COIL WITH NORMAL ONE AND CHECK SPARK OF MISFIRING CYLINDER

  1. Replace the ignition coil with an ignition coil that functions normally.

  1. Perform a spark test.

    CAUTION:
    Always disconnect all the injector connectors.
    NOTICE:
    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 4 fuel injector connectors.

    3. Touch the spark plug assembly to the cylinder head.

    4. Crank the engine for less than 2 seconds and check for sparks.

      OK:
      Sparks jump across electrode gap.


NG
REPLACE ECM (RAV4_ACA30 RM0000017UO01KX.html)
OK

REPLACE IGNITION COIL (RAV4_ACA30 RM000002YO400WX.html)

33.CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.3Zr-Fae Engine Control System.Sfi System. Dtc P0300 Random / Multiple Cylinder Misfire Detected

  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
    B32-46 (E01) - Body ground
    		Always
    		Below 1 Ω
    B32-45 (E02) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *1
    		Front view of wire harness connector
    (to ECM)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND)
OK

REPLACE FUEL INJECTOR ASSEMBLY (RAV4_ACA30 RM000001EDS01DX.html)

34.CHECK FUEL LINE

  1. Check the fuel lines for leaks or blockage (RAV4_ACA30 RM000001EEZ00XX.html).



NG
REPAIR OR REPLACE FUEL LINE
OK

REPLACE FUEL PUMP ASSEMBLY (RAV4_ACA30 RM0000017RJ032X.html)