Inspection Procedure

HINT:

• If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
• Read freeze frame data using the Techstream. 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.
• 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:
  1. There was insufficient fuel in the tank.
  2. Improper fuel is used.
  3. The spark plugs have been contaminated.
  4. The problem requires further diagnosis.
• After finishing repairs, check the misfire counts of the cylinders (Cylinder #1 Misfire Count to Cylinder #8 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 RPM. If misfires occur only in high engine RPM areas, only DTC P0300 is set.

  In the event of DTC P0300 being present, perform the following operations:

  1. Clear the DTC (see DTC CHECK / CLEAR ).
  2. Start the engine and conduct the confirmation driving pattern.
  3. Read the misfiring rates of each cylinder or DTC(s) using the Techstream.
  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.
• 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 misfire have occurred only while warming up the engine.

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

      RESULT CHART
      
      

      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: GO TO DTC CHART  (See DIAGNOSTIC TROUBLE CODE CHART )

   A: Go to Next Step 

2. READ VALUE OF TECHSTREAM (MISFIRE RPM AND MISFIRE LOAD) 
   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.

3. CHECK VENTILATION HOSE (HOSE CONNECTIONS) 

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

   NG: REPAIR OR REPLACE VENTILATION HOSE  (See ON-VEHICLE INSPECTION )

   OK: Go to Next Step 

4. CHECK MISFIRE COUNT OF PORT INJECTION 
   1. Connect the Techstream to the DLC3.
   2. Turn the engine switch on (IG).
   3. Turn the Techstream ON.
   4. Clear DTCs (see 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 

         RESULT CHART
         
         

         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: Go to step  16

   A: Go to Next Step 

5. CHECK MISFIRE COUNT OF DIRECT INJECTION 
   1. Connect the Techstream to the DLC3.
   2. Turn the engine switch on (IG).
   3. Turn the Techstream ON.
   4. Clear DTCs (see 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 

         RESULT CHART
         
         

         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: Go to step  10

   C: REPLACE FUEL INJECTOR FOR PORT INJECTION (MISFIRING CYLINDER)  (See REMOVAL )

   D: Go to step  14

   A: Go to Next Step 

6. CHECK SPARK PLUG 
   1. Remove the ignition coil and the spark plug of the misfiring cylinder.
   2. Measure the spark plug electrode gap.

      Standard gap: 1.0 to 1.1 mm (0.039 to 0.043 in.) 

   3. Check the electrode for carbon deposits.

      Recommended spark plug: 

      SPARK PLUG SPECIFICATION
      
      

      Manufacturer	Product
      DENSO	FK20HBR11

      Fig 1: Measuring Spark Plug Electrode Gap

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: If the electrode gap is larger than standard, replace the spark plug. Do not adjust the electrode gap.

   NG: REPLACE SPARK PLUG  (See REMOVAL )

   OK: Go to Next Step 

7. CHECK FOR SPARK AND IGNITION 
   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: Go to step  9

   OK: Go to Next Step 

8. CHECK CYLINDER COMPRESSION PRESSURE (MALFUNCTIONING CYLINDER) 
   1. Measure the cylinder compression pressure of the misfiring cylinder (see ON-VEHICLE INSPECTION ).

   OK: REPLACE ECM  (See REMOVAL )

   NG: CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION 

9. CHANGE TO NORMAL SPARK PLUG AND CHECK SPARK OF MISFIRING CYLINDER 
   1. Change the installed spark plug to a spark plug that functions normally.
   2. Perform a spark test.
      CAUTION: 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: REPLACE IGNITION COIL ASSEMBLY THEN CONFIRM THAT THERE IS NO MISFIRE  (See REMOVAL )

   OK: REPLACE SPARK PLUG  (See REMOVAL )

10. 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: Go to Next Step 

11. READ VALUE OF TECHSTREAM (COOLANT TEMP) 
    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: REPLACE ENGINE COOLANT TEMPERATURE SENSOR  (See REMOVAL )

    OK: Go to Next Step 

12. INSPECT MASS AIR FLOW METER (BANK 1 AND BANK 2) 
    1. Inspect the mass air flow meter (see REMOVAL ).

    NG: REPLACE MASS AIR FLOW METER  (See REMOVAL )

    OK: Go to Next Step 

13. CHECK VALVE TIMING  (See INSPECTION PROCEDURE )

    NG: ADJUST VALVE TIMING  (See INSTALLATION )

    OK: REPLACE ECM  (See REMOVAL )

14. CHECK FUEL PRESSURE (LOW PRESSURE SIDE) 
    1. Check the fuel pressure (low pressure side) (see ON-VEHICLE INSPECTION ).

    OK: REPLACE FUEL INJECTOR FOR PORT INJECTION  (See REMOVAL )

    NG: Go to Next Step 

15. CHECK FUEL PUMP OPERATION 
    1. Check the fuel pump operation (see INSPECTION ).

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

    NG: REPLACE FUEL PUMP  (See REMOVAL )

16. CHECK MISFIRE COUNT OF DIRECT INJECTION 
    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 

          RESULT CHART
          
          

          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: Go to step 17 

    C: Go to step  19

    A: REPLACE FUEL INJECTOR FOR DIRECT INJECTION (MISFIRING CYLINDER)  (See REMOVAL )

17. CHECK FUEL PRESSURE SENSOR 
    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: 3 to 5 MPa 

       2500 RPM (No load): 6 to 10 MPa 

       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: REPAIR OR REPLACE FUEL SYSTEM FOR HIGH PRESSURE (Refer to table below DTC P0087 OR P0088)  (See DTC P0087 FUEL RAIL / SYSTEM PRESSURE - TOO LOW )

    OK: Go to Next Step 

18. READ VALUE OF TECHSTREAM 
    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 

       RESULT CHART
       
       

       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: REPLACE FUEL PRESSURE SENSOR  (See REMOVAL )

    C: REPLACE ECM  (See REMOVAL )

    D: REPLACE FUEL INJECTOR FOR DIRECT INJECTION (MALFUNCTIONING CYLINDER INJECTOR)  (See REMOVAL )

    A: REPLACE FUEL PRESSURE SENSOR  (See REMOVAL )

19. CHECK MISFIRE COUNT 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream ON.
    4. Clear DTCs (see 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 

       RESULT CHART
       
       

       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: Go to step  6

    C: Go to step  10

    D: REPLACE FUEL INJECTOR FOR DIRECT INJECTION (MALFUNCTIONING CYLINDER INJECTOR)  (See REMOVAL )

    E: Go to step  17

    A: CHECK FOR INTERMITTENT PROBLEMS  (See CHECK FOR INTERMITTENT PROBLEMS )