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; DTC P0305: Cylinder 5 Misfire Detected; DTC P0306: Cylinder 6 Misfire Detected; DTC P0307: Cylinder 7 Misfire Detected; DTC P0308: Cylinder 8 Misfire Detected: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine / Trouble Codes.
5. Read the DTCs.

   Result

   Result	Proceed to
   DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 are output	A
   DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 and other DTCs are output	B

   HINT: 

   If any DTCs other than P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and P0308 are output, troubleshoot those DTCs first.

B → See step   48 

A: Go to next step 

1. Inspect the PCV hose. Refer to ON-VEHICLE INSPECTION .

   OK

   PCV hose is connected correctly and is not damaged.

NG → REPAIR OR REPLACE PCV HOSE 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Enter the following menus: Powertrain / Engine / Data List / All Data / Misfire RPM and Misfire Load.
4. 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: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear DTCs. Refer to DTC CHECK / CLEAR .
5. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Port. (Procedure "A")
6. Allow the engine to idle.
7. Monitor all of the misfire count values that are displayed on the Techstream: Powertrain / Engine / Data List / All Data / Cylinder #1 Misfire Count to Cylinder #8 Misfire Count.

   If no misfire counts occur for any of the cylinders, perform the following procedure: (Procedure "B")

   1. Move the shift lever to D.
   2. Repeat procedure "A" to "B" above.
   3. Monitor all of the misfire count values that are displayed on the Techstream.

      Result

      Misfire count	Proceed to
      There are no misfire counts	A
      1 or 2 cylinders have misfire counts	B
      3 cylinders or more have misfire counts	B

B → See step   7 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear DTCs. Refer to DTC CHECK / CLEAR .
5. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct. (Procedure "A")
6. Allow the engine to idle.
7. Monitor all of the misfire count values that are displayed on the Techstream: Enter the following menus: Powertrain / Engine / Data List / All Data / Cylinder #1 Misfire Count Cylinder #8 Misfire Count.

   If no misfire counts occur for any of the cylinders, perform the following procedure: (Procedure "B")

   1. Move the shift lever to D.
   2. Repeat procedure "A" to "B" above.
   3. Monitor all of the misfire count values that are displayed on the Techstream.

      Result

      Misfire Count		Proceed to
      Port	Direct
      There are no misfire counts	1 or 2 cylinders have misfire counts	A
      There are no misfire counts	3 cylinders or more have misfire counts	B
      There are no misfire counts	There are no misfire counts	C

B → See step   27 

C → See step   6 

A → See step   41 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear DTCs. Refer to DTC CHECK / CLEAR .
5. Enter the following menus: Powertrain / Engine / Data List / Misfire RPM, Misfire Load, Cylinder #1 Misfire Count to Cylinder #8 Misfire Count and Injection Way.
6. Drive the vehicle with Misfire RPM and Misfire Load.
7. Monitor all of the misfire count values or DTCs and Injection Way displayed on the Techstream.

   Result

   Misfire count	Injection Way	Proceed to
   There are no misfire counts	-	A
   1 or 2 cylinders have misfire counts	Port or Either	B
   3 cylinders or more have misfire counts	Port or Either	C
   1 or 2 cylinders have misfire counts	Direct	D
   3 cylinders or more have misfire counts	Direct	E

B → See step   8 

C → See step   17 

D → See step   51 

E → See step   27 

A → See step   42 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear DTCs. Refer to DTC CHECK / CLEAR .
5. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct. (Procedure "A")
6. Allow the engine to idle.
7. Monitor all of the misfire count values that are displayed on the Techstream: Powertrain / Engine / Data List / All Data / Cylinder #1 Misfire Count to Cylinder #8 Misfire Count.

   If no misfire counts occur for any of the cylinders, perform the following procedure: (Procedure "B")

   1. Move the shift lever to D.
   2. Repeat procedure "A" to "B" above.
   3. Monitor all of the misfire count values that are displayed on the Techstream.

      Result

      Misfire Count		Proceed to
      Port	Direct
      1 or 2 cylinders have misfire counts	1 or 2 cylinders have misfire counts	A
      3 cylinders or more have misfire counts	3 cylinders or more have misfire counts	B
      1 or 2 cylinders have misfire counts	There are no misfire counts	C
      3 cylinders or more have misfire counts	There are no misfire counts	D

B → See step   17 

C → See step   49 

D → See step   26 

A: Go to next step 

1. Inspect the spark plug. Refer to ON-VEHICLE INSPECTION - Step 2 .

NG → See step   45 

OK: Go to next step 

1. Remove the ignition coil assemblies.
2. Remove the spark plugs.
3. Install the spark plug to the ignition coil.
4. Disconnect the 2 fuel delivery pipe connectors.
5. Disconnect the 4 connectors with wire harness locks from the 2 injector drivers.
   Fig 1: Location of Fuel Delivery Pipe Connectors And Wire Harness Locks Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Attach the spark plug assembly to the cylinder head cover.
7. Crank the engine for less than 2 seconds and check the spark.

   OK

   Sparks jump across the electrode gap.

8. Reconnect the 4 connectors with wire harness locks to the 2 injector drivers.
9. Reconnect the 2 fuel delivery pipe connectors.
10. Reinstall the spark plugs.
11. Reinstall the ignition coil assemblies.

NG → See step   29 

OK: Go to next step 

1. Measure the cylinder compression pressure of the misfiring cylinder. Refer to ON-VEHICLE INSPECTION - Step 9 .

NG → CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION 

OK: Go to next step 

1. Check the valve clearance. Refer to ON-VEHICLE INSPECTION .

NG → See step   58 

OK: Go to next step 

1. Check the intake system for vacuum leaks. Refer to ON-VEHICLE INSPECTION .

   OK

   No leaks in the intake system.

NG → REPAIR OR REPLACE INTAKE SYSTEM 

OK: Go to next step 

NG → See step   56 

OK: Go to next step 

1. Check the fuel pressure (low pressure side). Refer to ON-VEHICLE INSPECTION - Step 2 .

NG → See step   31 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
5. Read the Data List 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).

NG → See step   50 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine / Data List / All Data / MAF and Coolant Temp.
5. Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.
6. Read MAF with the engine speed at 3000 RPM.

   Standard

   Between 17 g/sec. and 23 g/sec. (shift lever: N; A/C: Off).

NG → See step   36 

OK → See step   43 

1. Check the intake system for vacuum leaks. Refer to ON-VEHICLE INSPECTION .

   OK

   No leaks in the intake system.

NG → REPAIR OR REPLACE INTAKE SYSTEM 

OK: Go to next step 

NG → See step   56 

OK: Go to next step 

1. Check the fuel pressure (low pressure side). Refer to ON-VEHICLE INSPECTION - Step 2 .

NG → See step   31 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
5. Read the Data List 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).

NG → See step   50 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine / Data List / All Data / MAF and Coolant Temp.
5. Allow the engine to idle until Coolant Temp reaches 75°C (167°F) or higher.
6. Read MAF with the engine speed at 3000 RPM.

   Standard

   Between 17 g/sec. and 23 g/sec. (shift lever: N; A/C: Off).

NG → See step   36 

OK: Go to next step 

1. Inspect the spark plug. Refer to ON-VEHICLE INSPECTION - Step 2 .

NG → See step   45 

OK: Go to next step 

1. Remove the ignition coil assemblies.
2. Remove the spark plugs.
3. Install the spark plug to the ignition coil.
4. Disconnect the 2 fuel delivery pipe connectors.
5. Disconnect the 4 connectors with wire harness locks from the 2 injector drivers.
   Fig 2: Location of Fuel Delivery Pipe Connectors And Wire Harness Locks Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Attach the spark plug assembly to the cylinder head cover.
7. Crank the engine for less than 2 seconds and check the spark.

   OK

   Sparks jump across the electrode gap.

8. Reconnect the 4 connectors with wire harness locks to the 2 injector drivers.
9. Reconnect the 2 fuel delivery pipe connectors.
10. Reinstall the spark plugs.
11. Reinstall the ignition coil assemblies.

NG → See step   29 

OK: Go to next step 

1. Measure the cylinder compression pressure of the misfiring cylinder. Refer to ON-VEHICLE INSPECTION - Step 9 .

NG → CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION 

OK: Go to next step 

1. Check the valve clearance. Refer to ON-VEHICLE INSPECTION .

NG → See step   58 

OK → See step   43 

1. Check the fuel pressure (low pressure side). Refer to ON-VEHICLE INSPECTION - Step 2 .

NG → See step   31 

OK → See step   44 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Start the engine.
4. Enter the following menus: Powertrain / Engine / Data List / Fuel Press.
5. While revving the engine, check that the fuel pressure fluctuates.

   Standard

   Idling 

   3000 to 5000 kPa

   2000 RPM (No load) 

   7000 to 9000 kPa

   HINT: 

   The A/C switch and all accessory switches should be OFF, and the shift lever should be in N or P, and the engine should be fully warmed up.

NG → See step   33 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Start the engine and turn the Techstream on.
3. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct.

   HINT: 

   The A/C switch and all accessory switches should be OFF, and the shift lever should be in N or P, and the engine should be fully warmed up.

4. Read the value.
   1. Enter the following menus: Data List / All Data / Short FT #1, Long FT #1, Short FT #2, Long FT #2 and Fuel Pump Duty (D4).

      Result

      Item			Proceed to
      Fuel Pump Duty (D4)	Short FT #1 + Long FT #1	Short FT #2 + Long FT #2
      40% or more	-20% or less	-20% or less	A
      10% or less	+20% or more	+20% or more	A
      40% or more	+20% or more	+20% or more	B
      10% or less	-20% or less	-20% or less	C
      10% to 40%	-	-	D

B → See step   35 

C → See step   43 

D → See step   51 

A → See step   57 

1. Change the installed spark plug to a spark plug that functions normally.
2. Perform a spark test.
   WARNING:

   Always disconnect each injector connector.

   NOTE:

   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 2 fuel delivery pipe connectors..
   3. Disconnect the 4 connectors with wire harness locks from the 2 injector drivers.
      Fig 3: Location of Fuel Delivery Pipe Connectors And Wire Harness Locks Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Ground the spark plug.
   5. Check if sparks occur while the engine is being cranked.

      OK

      Sparks jump across the electrode gap.

NG → See step   30 

OK → See step   45 

1. Change the installed ignition coil to a ignition coil that functions normally.
2. Perform a spark test.
   WARNING:

   Always disconnect each injector connector.

   NOTE:

   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 2 fuel delivery pipe connectors.
   3. Disconnect the 4 connectors with wire harness locks from the 2 injector drivers.
      Fig 4: Location of Fuel Delivery Pipe Connectors And Wire Harness Locks Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Ground the spark plug.
   5. Check if sparks occur while the engine is being cranked.

      OK

      Sparks jump across the electrode gap.

NG → See step   43 

OK → See step   46 

1. Check the fuel pump operation. Refer to ON-VEHICLE INSPECTION - Step 1 .

NG → See step   52 

OK: Go to next step 

1. Check the fuel line for leakage and blockage.

NG → REPAIR OR REPLACE FUEL LINE 

OK → CHECK AND REPLACE FUEL SYSTEM (FUEL PUMP, PRESSURE REGULATOR, FUEL LINE AND FILTER) 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Start the engine.
4. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct.
5. Allow the engine to idle.
6. Monitor all of the misfire count values that are displayed on the Techstream: Powertrain / Engine / Data List / All Data / Cylinder #1 Misfire Count to Cylinder #8 Misfire Count.

   If no misfire counts occur for any of the cylinders, perform the following procedure:

   1. Move the shift lever to D.
   2. Monitor all of the misfire count values that are displayed on the Techstream.

      Result

      Misfire Count	Proceed to
      No misfire counts, or misfire counts occur randomly in all cylinders	A
      Misfire counts occur in particular cylinder	B

B → See step   53 

A: Go to next step 

1. Turn the engine switch off.
2. Replace the No. 1 and No. 2 injector drivers with normal ones from another vehicle.
   NOTE:

   Do not disconnect and reconnect the connectors with the engine switch on (IG), as the injector driver (EDU) may be damaged.

3. Connect the Techstream to the DLC3.
4. Start the engine.
5. Clear DTCs. Refer to DTC CHECK / CLEAR .
6. Perform the driving test.
7. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
8. Read the pending DTCs.
   RESULT
   
   

   Result	Proceed to
   DTC P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 are output	A
   DTC is not output	B

B → See step   54 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Start the engine.
4. Enter the following menus: Powertrain / Engine / Data List / Fuel Press.
5. Record the Fuel Press value.
6. Turn the engine switch off.
7. Wait for 10 seconds.
8. Turn the engine switch on (IG) and turn the Techstream on.
9. Enter the following menus: Powertrain / Engine / Data List / Fuel Press.
10. Compare the Fuel Press value recorded with the engine running to the Fuel Press value currently shown on the Techstream.

    Result

    Inspection Result	Proceed to
    Fuel Press value is maintained	A
    Fuel Press value drops	B

B → See step   55 

A → See step   47 

1. Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter and ECM. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE .

   HINT: 

   Repair any problems.

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs. Refer to DTC CHECK / CLEAR .
5. Turn the engine switch off.
6. Turn the engine switch on (IG) and turn the Techstream on.
7. Start the engine and warm it up.
8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308.
11. Check the DTC judgment result.
    RESULT
    
    

    Result	Proceed to
    ABNORMAL (P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308 output)	A
    NORMAL (No DTC output)	B

B → END 

A: Go to next step 

1. Disconnect the mass air flow meter connector.
2. Disconnect the ECM connector.
3. Measure the resistance between the terminals.

   Standard resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   E29-5 (VG) - E3-25 (VG)	Always	Below 1 Ω
   E29-4 (E2G) - E3-24 (E2G)	Always	Below 1 Ω

   Standard resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   E29-5 (VG) or E3-25 (VG) - Body ground	Always	10 kΩ or higher

4. Reconnect the mass air flow meter connector.
5. Reconnect the ECM connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the mass air flow meter assembly. Refer to REMOVAL .

   HINT: 

   If the results of the inspections performed in steps 16 and 21 indicated no problem, proceed to the next step without replacing the mass air flow meter assembly.

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear the DTCs. Refer to DTC CHECK / CLEAR .
5. Turn the engine switch off.
6. Turn the engine switch on (IG) and turn the Techstream on.
7. Start the engine and warm it up.
8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
10. Input the DTC: P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308.
11. Check the DTC judgment result.
    RESULT
    
    

    Result	Proceed to
    NORMAL (No DTC output)	A
    ABNORMAL (P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308 output)	B

B → See step   43 

A → END