IGNITION SYSTEM ON-VEHICLE INSPECTION

PROCEDURE

  1. PERFORM SPARK TEST

    1. Check for DTCs.

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      Note:

      If any DTC is present, perform troubleshooting in accordance with the procedure for that DTC.

    2. Check whether sparks occur.

      1. Remove the 4 ignition coils and 4 spark plugs.

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      2. A205071

        Disconnect the 4 injector connectors.

      3. Install the spark plug onto each ignition coil and connect the ignition coil connectors.

      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.

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

        • 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. INSPECT IGNITION COIL AND SPARK TEST

    1. Spark test flowchart.

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

        Table 1. Result

        Result

        Proceed to

        NG

        Connect securely

        OK

        Go to next step

      2. Perform a spark test on a malfunctioning ignition coil with igniter.

        1. Replace the ignition coil with a normal one.

        2. Perform the spark test again.

        Table 2. Result

        Result

        Proceed to

        OK

        Replace ignition coil with igniter

        NG

        Go to next step

      3. Check the power supply to the ignition coil with igniter.

        1. Turn the ignition switch to ON.

        2. Check that there is battery voltage at the ignition coil positive (+) terminal.

        Table 3. Result

        Result

        Proceed to

        NG

        Check wiring between ignition switch and ignition coil with igniter

        OK

        Go to next step

      4. Inspect the spark plugs.

        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 the spark plug

          NG

          Inspect the 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.

      5. Connect the 4 injector connectors.

      6. Install the 4 ignition coils and 4 spark plugs.

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    2. 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.

    1. I039522C07

      *1

      Ground

      Check the electrode.

      1. Using a megohmmeter, measure the insulation resistance.

        Standard resistance

        10 MΩ or higher

        If the result is not as specified, clean the spark plug with a spark plug cleaner and measure the resistance again.

        Tip:

        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 to its thread and insulator.

      If there is any damage, replace the spark plug.

      Recommended Spark Plug

      Manufacturer

      Product

      DENSO

      SC20HR11

    4. Reference:

      1. Check the spark plug electrode gap.

        Maximum electrode gap for used spark plug

        1.3 mm (0.0512 in.)

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

        Electrode gap for new spark plug

        1.0 to 1.1 mm (0.0394 to 0.0433 in.)

    5. Clean the spark plug.

      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 kgf/cm2, 85 psi)

      Duration

      20 seconds or less

      Tip:

      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.