IGNITION SYSTEM ON-VEHICLE INSPECTION

PROCEDURE


  1. PERFORM SPARK TEST

    Tech Tips

    Perform "Inspection After Repair" after replacing a spark plug or ignition coil assembly.

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    1. Check for DTCs.

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      Note

      If any DTCs are present, perform troubleshooting in accordance with the procedure for each DTC.

    2. Remove the 4 ignition coil assemblies and 4 spark plugs.

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      Note

      If the ignition coil assembly or spark plug has been struck or dropped, replace it.

      Tech Tips

      Arrange the removed parts in the correct order.

    3. B0047IM

      Disconnect the 4 fuel injector connectors.

      Note

      Perform this step in order to stop fuel injection to prevent damage to the catalyst due to unburned fuel.

    4. B00457F

      Install the spark plug into the ignition coil assembly, and then connect the ignition coil assembly connector.

    5. Ground the spark plug.

    6. Check that spark occurs at each spark plug while the engine is being cranked.

      Note


      • When performing the inspection, be sure to ground the hexagonal portion or the threaded portion of the spark plug.

      • Do not crank the engine for more than 2 seconds.


        • For vehicles with a cranking hold function, turn the engine switch off during cranking to stop cranking.

      • If an ignition coil assembly has been struck or dropped, replace it.

      • If a spark plug has been struck or dropped, replace it.

    7. If spark does not occur, perform the following procedure.

  2. INSPECT IGNITION COIL ASSEMBLY

    Tech Tips

    Perform "Inspection After Repair" after replacing a spark plug or ignition coil assembly.

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    1. Perform the spark test in accordance with the following procedure.


      1. Check that the ignition coil assembly connector is securely connected.

        Result
        Result Action
        NG Connect securely
        OK Go to next step

      2. Perform a spark test on each ignition coil assembly.


        1. If there is a cylinder where sparks do not occur, replace its ignition coil assembly with the ignition coil assembly of a cylinder where sparks occur normally.

        2. Crank the engine and visually check that sparks occur at the cylinder with the normally operating ignition coil assembly.

          Result
          Result Action
          NG Go to next step
          OK

          Replace ignition coil assembly

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        Note

        If the ignition coil assembly or spark plug has been struck or dropped, replace it.

      3. Perform a spark test on each spark plug.


        1. If there is a cylinder where sparks do not occur, replace its spark plug with the spark plug of a cylinder where sparks occur normally.

        2. Crank the engine and visually check that sparks occur at the cylinder with the normally operating spark plug.

          Result
          Result Action
          NG

          Inspect ignition system

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          OK

          Replace spark plug

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        Note

        If the ignition coil assembly or spark plug has been struck or dropped, replace it.

    2. Connect the 4 fuel injector connectors.

    3. Install the 4 spark plugs and 4 ignition coil assemblies.

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      Note

      If the ignition coil assembly or spark plug has been struck or dropped, replace it.

      Tech Tips

      Install the same parts to their original positions.

    4. Check for DTCs.

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      Tech Tips

      Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

    5. Clear the DTCs.

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  3. INSPECT SPARK PLUG

    Note


    • Be careful not to damage the iridium tip or platinum tip of the spark plug.

    • Check the iridium tip visually as it is easily damaged.

    • Never attempt to adjust the electrode gap of a used spark plug.

    • If the spark plug is extremely dirty with oil, etc., replace it.

    • Replace a spark plug if it is damaged at all.

    • When installing a new spark plug, do not remove the protective cap from the spark plug tip until just before installing the spark plug to the engine.

    • If the spark plug has been struck or dropped, replace it.

    • Do not use a wire brush for cleaning.

    Tech Tips

    Perform "Inspection After Repair" after replacing a spark plug.

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    1. B0046C6C06
      *a Ground

      Check the electrode using a megohmmeter:


      1. Using a megohmmeter, measure the insulation resistance.

        Standard Insulation Resistance
        Tester Connection Condition Specified Condition
        Spark plug (terminal part) - Ground Always 10 MΩ or higher

        Tech Tips

        If a megohmmeter is not available, perform the following simple inspection instead.

    2. B0045UX

      Alternative inspection method:


      1. Start the engine.

        Note

        Do not perform this step when any of the following DTCs are output: P0300, P0301, P0302, P0303, P0304 (Cylinder Misfire Detected).

      2. Quickly accelerate the engine to 4000 rpm 5 times.

        Note

        Do not perform this step when any of the following DTCs are output: P0300, P0301, P0302, P0303, P0304 (Cylinder Misfire Detected).

      3. Remove the spark plug.

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      4. Visually check the spark plug.

        Tech Tips

        If the electrode is dry, the spark plug is functioning properly. If the electrode is damp, proceed to the next step.

    3. Check the spark plug for any damage to its threads and insulator.

      If there is any damage, replace the spark plug.

      Recommended Spark Plug
      Manufacturer Spark Plug Type
      NGK ILKAR7G9
    4. B0046H8C06
      *a Electrode Gap

      Reference:


      1. Check the spark plug electrode gap.

        Maximum Electrode Gap for a Used Spark Plug
        1.3 mm (0.0512 in.)

        Note

        Never attempt to adjust the electrode gap of a used plug.

        If the electrode gap is more than the maximum, replace the spark plug.

        Electrode Gap for a New Spark Plug
        0.8 to 0.9 mm (0.0315 to 0.0354 in.)

    5. Install the spark plug.

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  4. PERFORM INITIALIZATION


    1. Perform "Inspection After Repair" after replacing a spark plug or ignition coil assembly.

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