Inspection Procedure

HINT.

• If any DTCs other than misfire DTCs are output, troubleshoot those DTCs first.
• When viewed from the rear of the engine assembly, Bank 1 is on the left side and Bank 2 is on the right side.
• Read freeze frame data using the intelligent tester or 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 (CYL #1, #2, #3, #4, #5, #6, #7 and #8)*1, (Cylinder #1 Misfire Count to Cylinder #8 Misfire Count)*2.
• 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. Turn the power switch ON (READY).
  3. Conduct the confirmation driving pattern.
  4. Read the misfiring rates of each cylinder or DTC(s) using the tester
  5. Repair the cylinder(s) that has a high misfiring rate or is indicated by the DTC.
  6. 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*1 (Short FT #1)*2, LONG FT #1*1 (Long FT #1)*2, SHORT FT #2 (Short FT #2)*2 or LONG FT #2 (Long FT #2)*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*1 (Coolant Temp)*2 in the freeze frame data is less than 75°C (167°F), the misfires have occurred only while warming up the engine.
• *1 Intelligent tester
• *2: Techstream

1. CHECK ANY OTHER DTC OUTPUT (IN ADDITION TO MISFIRE DTCS) 
   1. Connect the intelligent tester or Techstream to the DLC3.
   2. Turn the power switch ON (IG).
   3. Turn the tester ON.
   4. Enter the following menus:
      1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
      2. Techstream - Select. Powertrain / Engine and ECT / Trouble Codes
   5. Read DTCs.

      Result 

      RESULT REFERENCE
      
      

      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 USING INTELLIGENT TESTER OR TECHSTREAM (MISFIRE RPM AND MISFIRE LOAD) 
   1. Connect the intelligent tester or Techstream to the DLC3.
   2. Put the engine in inspection mode (see INSPECTION MODE PROCEDURE ).
   3. Turn the tester ON
   4. Enter the following menus:
      1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / DATA LIST / MISFIRE / MISFIRE RPM and MISFIRE LOAD.
      2. Techstream r Select: Powertrain / Engine and ECT / Data List / Misfire / Misfire RPM and Misfire Load.
   5. Read and note the MISFIRE RPM (Misfire RPM) and MISFIRE LOAD (Misfire Load) values.

      HINT:

      The MISFIRE RPM (Misfire RPM) and MISFIRE LOAD (Misfire Load) values indicate the vehicle conditions under which the misfire occurred

3. CHECK MISFIRE COUNT OF PORT INJECTION 
   1. Connect the intelligent tester or Techstream to the DLC3
   2. Put the engine in inspection mode (see INSPECTION MODE PROCEDURE )
   3. Turn the tester ON
   4. Clear DTCs (see DTC CHECK/CLEAR ).
   5. Enter the following menus.
      1. Intelligent tester - Select. DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / D-4S TEST / D-4S INJ SWITCH / PORT. (Procedure "A")
      2. Techstream - Select. Powertrain / Engine and ECT / Active Test / Control the Injection Way / Port. (Procedure "A")
   6. Allow the engine to idle.
   7. Monitor all of the misfire rate values that are displayed on the tester:
      1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / DATA LIST / MISFIRE / CYL #1 TO CYL #8.
      2. Techstream - Select: Powertrain / Engine and ECT / 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 shift lever to the D position.
      2. Repeat procedure "A" to "B" above.
      3. Monitor all of the misfire rate values that are displayed on the tester.

         Result 

         RESULT REFERENCE
         
         

         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 

4. CHECK MISFIRE COUNT OF DIRECT INJECTION 
   1. Connect the intelligent tester or Techstream to the DLC3.
   2. Put the engine in inspection mode (see INSPECTION MODE PROCEDURE ).
   3. Turn the tester ON.
   4. Clear DTCs (see DTC CHECK/CLEAR ).
   5. Enter the following menus
      1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / D-4S TEST / D-4S INJ SWITCH / DIRECT. (Procedure "A")
      2. Techstream - Select: Powertrain / Engine and ECT / Active Test / Control the Injection Way / Direct (Procedure "A")
   6. Allow the engine to idle.
   7. Monitor all of the misfire rate values that are displayed on the tester
      1. Intelligent tester - Select DIAGNOSIS / ENHANCED OBD II / DATA LIST / MISFIRE / CYL #1 TO CYL #8
      2. Techstream - Select. Powertrain / Engine and ECT / 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 shift lever to the D position.
      2. Repeat procedure "A" to "B" above.
      3. Monitor all of the misfire rate values that are displayed on the tester

         Result 

         RESULT REFERENCE
         
         

         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  9

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

   D:  Go to step  14

   A: Go to next step 

5. CHECK SPARK PLUG 
   1. Check the spark plug (see ON-VEHICLE INSPECTION )

   NG: REPLACE SPARK PLUG  (See REMOVAL )

   OK: Go to next step 

6. CHECK FOR SPARK AND IGNITION 
   1. Perform a spark test (see ON-VEHICLE INSPECTION )
      CAUTION: Always disconnect each injector connector.
      NOTE: Do not crank the engine for more than 2 seconds.

      OK: Sparks jump across the electrode gap. 

   NG:  Go to step  8

   OK: Go to next step 

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

   NG: CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION 

   OK: REPLACE ECM  (See REMOVAL )

8. 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 (see ON-VEHICLE INSPECTION ).
      CAUTION: Always disconnect each injector connector.
      NOTE: Do not crank the engine for more than 2 seconds.

      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 )

9. CHECK PCV HOSE (HOSE CONNECTIONS) 

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

   NG: REPAIR OR REPLACE PCV HOSE  (See REMOVAL )

   OK: Go to next step 

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  (See REMOVAL )

    OK: Go to next step 

11. READ VALUE USING INTELLIGENT TESTER OR TECHSTREAM (COOLANT TEMP) 
    1. Connect the intelligent tester or Techstream to the DLC3
    2. Put the engine in inspection mode (see INSPECTION MODE PROCEDURE ).
    3. Turn the tester ON.
    4. Enter the following menus:
       1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / COOLANT TEMP.
       2. Techstream - Select: Powertrain / Engine and ECT / 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 (for 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 REASSEMBLY )

    OK: REPLACE ECM  (See REMOVAL )

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

    NG: Go to step 15 

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

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

    NG: REPLACE FUEL PUMP  (See REMOVAL )

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

16. CHECK MISFIRE COUNT OF DIRECT INJECTION 
    1. Connect the intelligent tester or Techstream to the DLC3.
    2. Put the engine in inspection mode (see INSPECTION MODE PROCEDURE )
    3. Turn the tester ON.
    4. Clear DTCs (see DTC CHECK/CLEAR ).
    5. Enter the following menus'
       1. Intelligent tester - Select- DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / D-4S TEST / D-4S INJ SWITCH / DIRECT. (Procedure "A")
       2. Techstream - Select. Powertrain / Engine and ECT / Active Test / Control the Injection Way / Direct. (Procedure "A")
    6. Allow the engine to idle.
    7. Monitor all of the misfire rate values that are displayed on the tester.
       1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / DATA LIST / MISFIRE / CYL #1 to CYL #8.
       2. Techstream - Select: Powertrain / Engine and ECT / 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 shift lever to the D position.
       2. Repeat procedure "A" to "B" above.
       3. Monitor all of the misfire rate values that are displayed on the tester

          Result 

          RESULT REFERENCE
          
          

          Misfire Count		Proceed to
          Port	Direct
          There are no misfire counts	There are misfire counts	A
          There are no misfire counts	There are no misfire counts	B

    B: Go to step 17 

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

17. CHECK MISFIRE COUNT 
    1. Connect the intelligent tester or Techstream to the DLC3.
    2. Turn the power switch ON (READY).
    3. Turn the tester ON.
    4. Clear DTCs (see DTC CHECK/CLEAR ).
    5. Enter the following menus.
       1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / DATA LIST / USER DATA / MISFIRE RPM, MISFIRE LOAD CYL #1 to #8 and INJ WAY
       2. Techstream - Select: Powertrain / Engine and ECT / 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 (Misfire RPM) and MISFIRE LOAD (Misfire Load).
    7. Monitor all of the misfire rate values or DTCs and INJ WAY or Injection Way displayed on the tester.

       Result 

       RESULT REFERENCE
       
       

       Misfire count	INJ WAY (Injection Way)	Proceed to
       There are no misfire counts	-	A
       1 or 2 cylinders have misfire counts	EITHER (Either)	B
       3 cylinders or more have misfire counts	EITHER (Either)	C
       There are misfire counts	DIRECT (Direct)	D

    B:  Go to step  5

    C:  Go to step  9

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

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