2Gr-Fe Engine Control System. Dtc P0300 Random / Multiple Cylinder Misfire Detected

When the engine misfires, high concentrations of hydrocarbons (HC) 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 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 VVT sensor and the crankshaft position sensor. The VVT 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 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 occurs and one of the following conditions is detected (2 trip detection logic): High temperature misfire occurs in three-way catalytic converter (MIL blinks) Emission deterioration misfire occurs (MIL illuminates)	Open or short in engine wire harness Connector connection Vacuum hose connections Ignition system Injector Fuel pressure Mass Air Flow (MAF) meter Engine Coolant Temperature (ECT) sensor Compression pressure Valve clearance Valve timing PCV valve and hose PCV hose connections Air induction system ECM
P0301 P0302 P0303 P0304 P0305 P0306	Misfiring of specific cylinder occurs and one of the following conditions is detected (2 trip detection logic): High temperature misfire occurs in three-way catalytic converter (MIL blinks) Emission deterioration misfire occurs (MIL illuminates)

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

CONFIRMATION DRIVING PATTERN

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the tester on.
Record the DTC(s) and freeze frame data.
Using the tester, switch the ECM from normal mode to check mode (CAMRY_ACV40 RM000000PDL025X.html).
Read the misfire counts of each cylinder (Cylinder #1 (to #6) Misfire Count) with the engine idling. If any misfire count is displayed, skip the following confirmation driving pattern.
Drive the vehicle several times with the conditions, such as engine speed and engine load, shown in Misfire RPM and Misfire Load in the Data List.

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

Engine Speed
Duration
Idling
5 minutes or more
1000
4 minutes or more
2000
3 minutes or more
3000
2 minutes or more
Check whether misfires have occurred by checking DTCs and freeze frame data.
HINT:
Do not turn the engine 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.
Record the DTC(s), freeze frame data and misfire counts.

INSPECTION PROCEDURE

HINT:

If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
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.
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:

There was insufficient fuel volume in the tank.
Improper fuel is used.
The spark plugs have been contaminated.

After finishing repairs, check the misfire counts of the cylinders (Cylinder #1 Misfire Count to Cylinder #6 Misfire Count).
Be sure to confirm that no misfiring cylinder DTCs are set again by conducting the confirmation driving pattern after finishing repairs.
For 6 and 8 cylinder engines, the ECM intentionally does not set the specific misfiring cylinder DTCs at high engine speed. If misfires occur only in high engine speed areas, only DTC P0300 is set.
In the event of DTC P0300 being present, perform the following operations:

Clear the DTC (CAMRY_ACV40 RM000000PDK0D6X.html).
Start the engine and conduct the confirmation driving pattern.
Read the misfiring rates of each cylinder or DTC(s) using the tester.
Repair the cylinder(s) that has a high misfiring rate or is indicated by the DTC.
After finishing repairs, conduct the confirmation driving pattern again, in order to verify that DTC P0300 is not set.

When one of Short FT #1, Long FT #1, Short FT #2 or Long FT #2 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).
When the Coolant Temp in the freeze frame data is less than 75°C (167°F), the misfires have occurred only while the engine is being warmed up.
An extremely imbalanced drive wheel which causes body vibration may cause misfire DTCs detection.

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

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG).

Turn the tester on.

Enter the following menus: Powertrain / Engine / DTC.

Read the DTCs.

Result:

Result
Proceed to
DTC P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306 are output
A
DTC P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306 and other DTCs are output
B
HINT:
If any DTCs other than P0300, P0301, P0302, P0303, P0304, P0305 and P0306 are output, troubleshoot those DTCs first.

GO TO DTC CHART (CAMRY_ACV40 RM000002DSC00PX.html)

A

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

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG) and turn the tester on.

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

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 (HOSE CONNECTIONS)

Check the PCV hose connections (CAMRY_ACV40 RM0000012OO00BX.html).
OK:
PCV hose is connected correctly and is not damaged.

REPAIR OR REPLACE PCV HOSE

OK

4.READ VALUE USING INTELLIGENT TESTER (CATALYST OT MF F/C)

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG) and turn the tester on.

Enter the following menus: Powertrain / Engine / Data List / Catalyst OT MF F/C.

Read the value displayed on the tester.
Result:
Data List
Tester Display
Proceed to
Catalyst OT MF F/C
Avail
A
Not Avl
B

Go to step 6

A

5.PERFORM ACTIVE TEST USING INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG) and turn the tester on.

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

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

NEXT

6.READ VALUE USING INTELLIGENT TESTER (CYLINDER #1 (TO #6) MISFIRE COUNT)

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG).

Turn the tester on (Step "A").

Enter the following menus: Powertrain / Engine / Data List / Cylinder #1 (to #6) Misfire Count (Step "B").

Read each value for Cylinder #1 (to #6) Misfire Count displayed on the tester. If no misfire counts occur in any cylinders, perform the following procedure:
1. Start the engine and let it idle.
2. Move the shift lever to D.
3. Check the Cylinder #1 (to #6) Misfire Count.
4. If misfire counts are still not displayed, perform steps ("A") and ("B").

Drive the vehicle while satisfying the Misfire RPM and Misfire Load values noted in the "Read Value Using Intelligent Tester (Misfire RPM and Misfire Load)" procedure above.

Read Cylinder #1 (to #6) Misfire Count or the DTCs displayed on the tester.

Result:

Misfire Count
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 Coolant Temp value of the freeze frame data is below 75°C (167°F), the misfire may be detected only when the engine is cold.
3. Engine Run Time value of the freeze frame data is below 120 seconds, the misfire may be detected immediately after the engine is started.

Go to step 19

A

7.CHECK SPARK PLUG

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

Measure the spark plug electrode gap.
Maximum gap:
1.4 mm (0.0551 in.)

Check the electrode for carbon deposits.
Recommended Spark Plug
Manufacturer
Product
DENSO
FK20HR11
NOTICE:
If the electrode gap is larger than the maximum, replace the spark plug. Do not adjust the electrode gap.

Recommended Spark Plug
Manufacturer	Product
DENSO	FK20HR11

Reinstall the ignition coil assembly and the spark plug.

REPLACE SPARK PLUG

OK

8.CHECK FOR SPARK AND IGNITION (SPARK TEST)

Perform a spark test.
CAUTION:
During the test, disconnect all fuel injector assembly connectors.
NOTICE:
Do not crank the engine for more than 2 seconds.
1. Remove the ignition coil assembly from the cylinder head.
2. Install the spark plug onto the ignition coil assembly.
3. Disconnect the 6 fuel injector assembly connectors.
4. Touch the spark plug to the cylinder head.
5. Crank the engine for less than 2 seconds and check for spark.
  OK:
  Sparks jump across electrode gap.
6. Reconnect the 6 fuel injector assembly connectors.
7. Install the ignition coil assembly.

Go to step 31

OK

9.CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

Measure the cylinder compression pressure of the misfiring cylinder (CAMRY_ACV40 RM0000021ZG01CX_01_0004.html).

CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

OK

10.CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE)

Disconnect the fuel injector assembly connectors.

Turn the engine switch on (IG).

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
C7-2 - Body ground	Engine switch on (IG)	11 to 14 V
C9-2 - Body ground	Engine switch on (IG)	11 to 14 V
C8-2 - Body ground	Engine switch on (IG)	11 to 14 V
C10-2 - Body ground	Engine switch on (IG)	11 to 14 V
C36-2 - Body ground	Engine switch on (IG)	11 to 14 V
C37-2 - Body ground	Engine switch on (IG)	11 to 14 V

Reconnect the fuel injector assembly connectors.

CHECK FUEL INJECTOR CIRCUIT (CAMRY_ACV40 RM000002JKX00IX.html)

OK

11.CHECK HARNESS AND CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

Disconnect the fuel injector assembly connectors.

Disconnect the ECM connector.

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

Standard resistance:

RHD:

Tester Connection	Specified Condition
#10 (C58-45) - C7-1	Below 1 Ω
#20 (C58-85) - C9-1	Below 1 Ω
#30 (C58-44) - C8-1	Below 1 Ω
#40 (C58-84) - C10-1	Below 1 Ω
#50 (C58-43) - C36-1	Below 1 Ω
#60 (C58-83) - C37-1	Below 1 Ω
#10 (C58-45) or C7-1 - Body ground	10 kΩ or higher
#20 (C58-85) or C9-1 - Body ground	10 kΩ or higher
#30 (C58-44) or C8-1 - Body ground	10 kΩ or higher
#40 (C58-84) or C10-1 - Body ground	10 kΩ or higher
#50 (C58-43) or C36-1 - Body ground	10 kΩ or higher
#60 (C58-83) or C37-1 - Body ground	10 kΩ or higher

LHD:

Tester Connection	Specified Condition
#10 (C55-45) - C7-1	Below 1 Ω
#20 (C55-85) - C9-1	Below 1 Ω
#30 (C55-44) - C8-1	Below 1 Ω
#40 (C55-84) - C10-1	Below 1 Ω
#50 (C55-43) - C36-1	Below 1 Ω
#60 (C55-83) - C37-1	Below 1 Ω
#10 (C55-45) or C7-1 - Body ground	10 kΩ or higher
#20 (C55-85) or C9-1 - Body ground	10 kΩ or higher
#30 (C55-44) or C8-1 - Body ground	10 kΩ or higher
#40 (C55-84) or C10-1 - Body ground	10 kΩ or higher
#50 (C55-43) or C36-1 - Body ground	10 kΩ or higher
#60 (C55-83) or C37-1 - Body ground	10 kΩ or higher

Reconnect the fuel injector assembly connectors.

Reconnect the ECM connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

OK

12.INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30, #40, #50 AND/OR #60 VOLTAGE)

Disconnect the ECM connector.

Turn the engine switch on (IG).

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

Standard voltage:

RHD:

Tester Connection	Specified Condition
#10 (C58-45) - E01 (C58-22)	11 to 14 V
#20 (C58-85) - E01 (C58-22)	11 to 14 V
#30 (C58-44) - E01 (C58-22)	11 to 14 V
#40 (C58-84) - E01 (C58-22)	11 to 14 V
#50 (C58-43) - E01 (C58-22)	11 to 14 V
#60 (C58-83) - E01 (C58-22)	11 to 14 V

LHD:

Tester Connection	Specified Condition
#10 (C55-45) - E01 (C55-22)	11 to 14 V
#20 (C55-85) - E01 (C55-22)	11 to 14 V
#30 (C55-44) - E01 (C55-22)	11 to 14 V
#40 (C55-84) - E01 (C55-22)	11 to 14 V
#50 (C55-43) - E01 (C55-22)	11 to 14 V
#60 (C55-83) - E01 (C55-22)	11 to 14 V

Reconnect the ECM connector.

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

OK

13.CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER

Check the fuel injector assembly injection (whether fuel volume is high or low, and whether injection pattern is poor) (CAMRY_ACV40 RM000001IR101CX.html).

REPLACE FUEL INJECTOR ASSEMBLY (CAMRY_ACV40 RM000001IR301WX.html)

OK

14.CHECK INTAKE SYSTEM

Check the intake system for vacuum leakage.
OK:
No leaks in intake system.

REPAIR OR REPLACE INTAKE SYSTEM

OK

15.CHECK FUEL PRESSURE

Check the fuel pressure (CAMRY_ACV40 RM000001IQZ03DX_01_0002.html).

Go to step 33

OK

16.READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG).

Turn the tester on.

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

Read the Coolant Temp twice, when the engine is both cold and warmed up.
Standard:
With cold engine:
Same as ambient temperature.
With warm engine:
Between 75°C and 95°C (167°F and 203°F).

REPLACE ENGINE COOLANT TEMPERATURE SENSOR (CAMRY_ACV40 RM0000027V100KX.html)

OK

17.INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

HINT:

Inspect the mass air flow meter sub-assembly (CAMRY_ACV40 RM0000021ZY00OX.html).

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY (CAMRY_ACV40 RM0000027UV001X.html)

OK

18.CHECK VALVE TIMING

HINT:

Check the valve timing (CAMRY_ACV40 RM000000PDU0A6X_09_0005.html).

ADJUST VALVE TIMING (CAMRY_ACV40 RM000000T4X00LX.html)

REPLACE ECM (CAMRY_ACV40 RM0000022NT00VX.html)

19.CHECK INTAKE SYSTEM

Check the intake system for vacuum leaks.
OK:
No leaks in intake system.

REPAIR OR REPLACE INTAKE SYSTEM

OK

20.CHECK FUEL PRESSURE

Check the fuel pressure (CAMRY_ACV40 RM000001IQZ03DX_01_0002.html).

Go to step 33

OK

21.READ VALUE USING INTELLIGENT TESTER (COOLANT TEMP)

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG).

Turn the tester on.

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

Read the Coolant Temp twice, when the engine is both cold and warmed up.
Standard:
With cold engine:
Same as ambient air temperature.
With warm engine:
Between 75°C and 95°C (167°F and 203°F).

REPLACE ENGINE COOLANT TEMPERATURE SENSOR (CAMRY_ACV40 RM0000027V100KX.html)

OK

22.INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

HINT:

Inspect the mass air flow meter sub-assembly (CAMRY_ACV40 RM0000021ZY00OX.html).

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY (CAMRY_ACV40 RM0000027UV001X.html)

OK

23.CHECK VALVE TIMING

HINT:

Check the valve timing (CAMRY_ACV40 RM000000PDU0A6X_09_0005.html).

ADJUST VALVE TIMING (CAMRY_ACV40 RM000000T4X00LX.html)

OK

24.CHECK SPARK PLUG

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

Measure the spark plug electrode gap.
Maximum gap:
1.4 mm (0.0551 in.)

Check the electrode for carbon deposits.
Recommended Spark Plug
Manufacturer
Product
DENSO
FK20HR11
NOTICE:
If the electrode gap is larger than the maximum, replace the spark plug. Do not adjust the electrode gap.

Reinstall the ignition coil assembly and the spark plug.

REPLACE SPARK PLUG

OK

25.CHECK FOR SPARK AND IGNITION (SPARK TEST)

Perform a spark test.
CAUTION:
During the test, disconnect all fuel injector assembly connectors.
NOTICE:
Do not crank the engine for more than 2 seconds.
1. Remove the ignition coil assembly from the cylinder head.
2. Install the spark plug onto the ignition coil assembly.
3. Disconnect the 6 fuel injector assembly connectors.
4. Touch the spark plug to the cylinder head.
5. Crank the engine for less than 2 seconds and check for spark.
  OK:
  Sparks jump across electrode gap.
6. Reconnect the 6 fuel injector assembly connectors.
7. Install the ignition coil assembly.

Go to step 31

OK

26.CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER

Measure the cylinder compression pressure of the misfiring cylinder (CAMRY_ACV40 RM0000021ZG01CX_01_0004.html).

CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

OK

27.CHECK FUEL INJECTOR ASSEMBLY (POWER SOURCE)

Disconnect the fuel injector assembly connectors.

Turn the engine switch on (IG).

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
C7-2 - Body ground	Engine switch on (IG)	11 to 14 V
C9-2 - Body ground	Engine switch on (IG)	11 to 14 V
C8-2 - Body ground	Engine switch on (IG)	11 to 14 V
C10-2 - Body ground	Engine switch on (IG)	11 to 14 V
C36-2 - Body ground	Engine switch on (IG)	11 to 14 V
C37-2 - Body ground	Engine switch on (IG)	11 to 14 V

Reconnect the fuel injector assembly connectors.

CHECK FUEL INJECTOR CIRCUIT (CAMRY_ACV40 RM000002JKX00IX.html)

OK

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

Disconnect the fuel injector assembly connectors.

Disconnect the ECM connector.

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

Standard resistance:

RHD:

Tester Connection	Specified Condition
#10 (C58-45) - C7-1	Below 1 Ω
#20 (C58-85) - C9-1	Below 1 Ω
#30 (C58-44) - C8-1	Below 1 Ω
#40 (C58-84) - C10-1	Below 1 Ω
#50 (C58-43) - C36-1	Below 1 Ω
#60 (C58-83) - C37-1	Below 1 Ω
#10 (C58-45) or C7-1 - Body ground	10 kΩ or higher
#20 (C58-85) or C9-1 - Body ground	10 kΩ or higher
#30 (C58-44) or C8-1 - Body ground	10 kΩ or higher
#40 (C58-84) or C10-1 - Body ground	10 kΩ or higher
#50 (C58-43) or C36-1 - Body ground	10 kΩ or higher
#60 (C58-83) or C37-1 - Body ground	10 kΩ or higher

LHD:

Tester Connection	Specified Condition
#10 (C55-45) - C7-1	Below 1 Ω
#20 (C55-85) - C9-1	Below 1 Ω
#30 (C55-44) - C8-1	Below 1 Ω
#40 (C55-84) - C10-1	Below 1 Ω
#50 (C55-43) - C36-1	Below 1 Ω
#60 (C55-83) - C37-1	Below 1 Ω
#10 (C55-45) or C7-1 - Body ground	10 kΩ or higher
#20 (C55-85) or C9-1 - Body ground	10 kΩ or higher
#30 (C55-44) or C8-1 - Body ground	10 kΩ or higher
#40 (C55-84) or C10-1 - Body ground	10 kΩ or higher
#50 (C55-43) or C36-1 - Body ground	10 kΩ or higher
#60 (C55-83) or C37-1 - Body ground	10 kΩ or higher

Reconnect the fuel injector assembly connectors.

Reconnect the ECM connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR ASSEMBLY - ECM)

OK

29.INSPECT ECM TERMINAL OF MISFIRING CYLINDER (#10, #20, #30, #40, #50 AND/OR #60 VOLTAGE)

Disconnect the ECM connector.

Turn the engine switch on (IG).

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

Standard voltage:

RHD:

Tester Connection	Specified Condition
#10 (C58-45) - E01 (C58-22)	11 to 14 V
#20 (C58-85) - E01 (C58-22)	11 to 14 V
#30 (C58-44) - E01 (C58-22)	11 to 14 V
#40 (C58-84) - E01 (C58-22)	11 to 14 V
#50 (C58-43) - E01 (C58-22)	11 to 14 V
#60 (C58-83) - E01 (C58-22)	11 to 14 V

LHD:

Tester Connection	Specified Condition
#10 (C55-45) - E01 (C55-22)	11 to 14 V
#20 (C55-85) - E01 (C55-22)	11 to 14 V
#30 (C55-44) - E01 (C55-22)	11 to 14 V
#40 (C55-84) - E01 (C55-22)	11 to 14 V
#50 (C55-43) - E01 (C55-22)	11 to 14 V
#60 (C55-83) - E01 (C55-22)	11 to 14 V

Reconnect the ECM connector.

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

OK

30.CHECK FUEL INJECTOR ASSEMBLY OF MISFIRING CYLINDER

Check the fuel injector assembly injection (whether fuel volume is high or low, and whether injection pattern is poor) (CAMRY_ACV40 RM000001IR101CX.html).

REPLACE FUEL INJECTOR ASSEMBLY (CAMRY_ACV40 RM000001IR301WX.html)

REPLACE ECM (CAMRY_ACV40 RM0000022NT00VX.html)

31.CHANGE TO KNOWN GOOD SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER

Change the installed spark plug to a known good spark plug.

Perform a spark test.
CAUTION:
During the test, disconnect all fuel injector assembly connectors.
NOTICE:
Do not crank the engine for more than 2 seconds.
1. Remove the ignition coil assembly from the cylinder head.
2. Install the spark plug onto the ignition coil assembly.
3. Disconnect the 6 fuel injector assembly connectors.
4. Touch the spark plug to the cylinder head.
5. Crank the engine for less than 2 seconds and check for spark.
  OK:
  Sparks jump across electrode gap.
6. Reconnect the 6 fuel injector assembly connectors.
7. Install the ignition coil assembly.

Go to step 32

REPLACE SPARK PLUG

32.CHANGE TO KNOWN GOOD IGNITION COIL AND CHECK SPARK OF MISFIRING CYLINDER

Change the installed ignition coil assembly to a known good ignition coil assembly.

Perform a spark test.
CAUTION:
During the test, disconnect all fuel injector assembly connectors.
NOTICE:
Do not crank the engine for more than 2 seconds.
1. Remove the ignition coil assembly from the cylinder head.
2. Install the spark plug onto the ignition coil assembly.
3. Disconnect the 6 fuel injector assembly connectors.
4. Touch the spark plug to the cylinder head.
5. Crank the engine for less than 2 seconds and check for spark.
  OK:
  Sparks jump across electrode gap.
6. Reconnect the 6 fuel injector assembly connectors.
7. Install the ignition coil assembly.

REPLACE ECM (CAMRY_ACV40 RM0000022NT00VX.html)

REPLACE IGNITION COIL ASSEMBLY (CAMRY_ACV40 RM000001EFJ01IX.html)

33.CHECK FUEL LINE

Check the fuel lines for leaks or blockage.

REPAIR OR REPLACE FUEL LINE

REPLACE FUEL PUMP (CAMRY_ACV40 RM000001IRA019X.html)

Engine Speed	Duration
Idling	5 minutes or more
1000	4 minutes or more
2000	3 minutes or more
3000	2 minutes or more

Result	Proceed to
DTC P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306 are output	A
DTC P0300, P0301, P0302, P0303, P0304, P0305 and/or P0306 and other DTCs are output	B

Data List	Tester Display	Proceed to
Catalyst OT MF F/C	Avail	A
Catalyst OT MF F/C	Not Avl	B

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