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 DTCs.
   RESULT
   
   

   Display (DTC output)	Proceed to
   P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308	A
   P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307 and/or P0308 and other DTCs	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   27 

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. Enter the following menus: Powertrain / Engine / Data List / Misfire / 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) and turn the Techstream on.
3. Enter the following menus: Powertrain / Engine / Data List / Catalyst OT MF F/C.
4. Read the valve displayed on the Techstream.
   RESULT
   
   

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

B → See step   5 

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. Enter the following menus: Powertrain / Engine / Active Test / Prohibit the Catalyst OT Misfire Prevent F/C.
4. Perform the Active Test.
   NOTE:

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

NEXT: Go to next step 

OK

Ventilation hose is connected correctly and is not damaged.

NG → See step   28 

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. 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 / Misfire / 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 gear selector lever to the D position.
   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
      1 or 2 cylinders have misfire counts	A
      3 cylinders or more have misfire counts	A
      There are no misfire counts	B

B → See step   18 

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: Powertrain / Engine / Data List / Misfire / 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 gear selector lever to the D position.
   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   12 

C → See step   38 

D → See step   16 

A: Go to next step 

1. Remove the ignition coil and the spark plug of the misfiring cylinder.
2. Measure the spark plug electrode gap. Refer to ON-VEHICLE INSPECTION - Step 2 .

NG → See step   29 

OK: Go to next step 

1. Disconnect the injector connectors, in order to prevent the engine from starting.
2. Install the spark plug to the ignition coil.
3. Attach the spark plug assembly to the cylinder head cover.
4. Crank the engine for less than 2 seconds and check the spark.

   OK

   Sparks jump across the electrode gap.

5. Reconnect the injector connectors.

NG → See step   11 

OK: Go to next step 

1. Measure the cylinder compression pressure of the misfiring cylinder. Refer to ON-VEHICLE INSPECTION - Step 6 .

OK → See step   37 

NG → CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION 

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 injector connector.
   3. Ground the spark plug.
   4. Check if sparks occur while the engine is being cranked.

      OK

      Sparks jump across the electrode gap.

NG → See step   30 

OK → See step   29 

1. Check the air induction system for vacuum leakage.

   OK

   No leakage from air induction system.

NG → REPAIR OR REPLACE AIR INDUCTION SYSTEM 

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 / 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   32 

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 / Primary / Engine Speed, Coolant Temp, MAF #1 and MAF #2.
5. Allow the engine to idle until the ECT reaches 75°C (167°F) or higher.
6. Read MAF #1 and MAF #2 with the engine speed at 2000 rpm.

   Standard

   Between 2.4 to 12.8 g/s (shift lever is in N position and A/C is OFF)

NG → See step   22 

OK: Go to next step 

NG → See step   31 

OK → See step   37 

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

OK → See step   40 

NG: Go to next step 

1. Check the fuel pump operation. Refer to INSPECTION .

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

NG → See step   35 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Clear DTCs.
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 / Misfire / 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 gear selector lever to the D position.
   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   19 

C → See step   21 

A → See step   39 

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 / All Data / 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 transmission gear selector lever should be in the N or P position, and the engine should be fully warmed up.

NG → See step   42 

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 transmission gear selector lever should be in the N or P position, and the engine should be fully warmed up.

4. Read the value: Data List / A/F Control System / 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   34 

C → See step   37 

D → See step   41 

A → See step   36 

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 / All Data / 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	Either	B
   3 cylinders or more have misfire counts	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   12 

D → See step   41 

E → See step   19 

A → See step   33 

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
    
    

    Display (DTC Output)	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 

Fig 1: Checking Harness And Connector (Mass Air Flow Meter - ECM)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the E13 or E22 MAF meter connector.
2. Disconnect the E1 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for open)

   Tester Connection	Condition	Specified Condition
   E13-1 (VG) - E1-25 (VG)	Always	Below 1 Ω
   E13-2 (E2G) - E1-24 (E2G)	Always	Below 1 Ω
   E22-1 (VGR) - E1-23 (VG2)	Always	Below 1 Ω
   E22-2 (EVGR) - E1-32 (E2G2)	Always	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Condition	Specified Condition
   E13-1 (VG) or E1-25 (VG) - Body ground	Always	10 kΩ or higher
   E22-1 (VGR) or E1-23 (VG2) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

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

   HINT: 

   If the results of the inspections performed in steps 14 indicated no problem, proceed to the next step without replacing the mass air flow meter.

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
    
    

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

B → See step   37 

A → END