IGNITION SYSTEM ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

CAUTION:

To prevent injury due to contact with an operating fan and generator V-belt or cooling fan, keep your hands and clothing away from the fan and generator V-belt and cooling fans when working in the engine compartment with the engine running.

B00697X

PROCEDURE


  1. PERFORM SPARK TEST

    CAUTION:

    To prevent injury due to contact with an operating fan and generator V-belt or cooling fan, keep your hands and clothing away from the fan and generator V-belt and cooling fans when working in the engine compartment with the engine running.


    1. Check for DTCs.

      Click here

      Note

      If a DTC is output, perform troubleshooting procedures for that DTC.

    2. Check if sparks occur.


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

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      2. Disconnect the 4 injector connectors.

      3. Install the spark plug to the ignition coil assembly and connect the ignition coil connector.

      4. Ground the spark plug.

      5. Visually check that sparks occur 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.

        • If an ignition coil assembly is struck or dropped, replace it with a new one.

        • If a spark plug is struck or dropped, replace it with a new one.

  2. PERFORM IGNITION COIL AND SPARK TEST

    Tech Tips

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

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    1. Spark test procedure.


      1. Check that the wire harness side connector of the ignition coil assembly is securely connected.

        Result
        Result Proceed to
        NG Connect securely
        OK Go to next step

      2. Perform a spark test on the malfunctioning ignition coil assembly.


        1. Replace the ignition coil assembly with a normal one.

        2. Perform the spark test again.

        Result
        Result Proceed to
        OK Replace ignition coil assembly
        NG Go to next step

      3. Inspect the spark plug.


        1. If there is a cylinder in which ignition does not occur, interchange the spark plug of that cylinder and the spark plug of a cylinder in which ignition properly occurs.

        2. Check that sparks occur in the cylinder in which the properly functioning spark plug was installed.

        Result
        Result Proceed to
        OK Replace spark plug
        NG

        Inspect ignition system

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        Note


        • If an ignition coil assembly is struck or dropped, replace it with a new one.

        • If a spark plug is struck or dropped, replace it with a new one.

      4. Check the camshaft position sensor.

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      5. Check the crankshaft position sensor.

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    2. Connect the 4 injector connectors.

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

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    4. Clear DTCs.

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  3. INSPECT SPARK PLUG

    Note


    • Do not use a wire brush for cleaning.

    • Do not attempt to adjust the electrode gap of a used spark plug.

    Tech Tips

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

    Click here


    1. A01LEFOC03
      *a Body Ground

      Check the electrode.


      1. Using a megohmmeter, measure the insulation resistance.

        Standard Insulation Resistance
        Tester Connection Condition Specified Condition
        Spark plug (Terminal part) - Body ground Always 10 MΩ or higher

        Tech Tips

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

    2. Alternative inspection method:


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

      2. Remove the spark plug.

      3. Visually check the spark plug.

        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 on its threads and insulator.

      If there is damage, replace the spark plug. If not, reinstall the spark plug.

      Recommended Spark Plug
      Manufacturer Product
      DENSO FK20HR-A8

    4. Check the spark plug electrode gap.

      Maximum electrode gap for used spark plug
      1.1 mm (0.0433 in.)

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

      Electrode gap for new spark plug
      0.7 to 0.8 mm (0.0276 to 0.0315 in.)

      Note

      When adjusting the gap of a new spark plug, bend only the base of the ground electrode. Do not touch the tip. Never attempt to adjust the gap of a used plug.

    5. A01LCTX

      Clean the spark plugs.

      If the electrode has traces of wet carbon, clean the electrode with a spark plug cleaner and then dry it.

      Air pressure
      588 kPa (6.0 kgf/cm2, 85 psi)
      Duration
      20 seconds or less

      Tech Tips

      Only use the spark plug cleaner when the electrode is free of oil. If the electrode has traces of oil, use gasoline to clean off the oil before using the spark plug cleaner.