IGNITION SYSTEM ON-VEHICLE INSPECTION

PROCEDURE

  1. PERFORM SPARK TEST

    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 No. 1 engine cover.

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    3. Remove the 4 No. 1 ignition coils and 4 spark plugs.

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    4. A200174

      Disconnect the 4 injector connectors.

    5. A200175

      Install a spark plug to each No. 1 ignition coil and connect the No. 1 ignition coil connector.

    6. Ground the spark plug.

    7. Check that spark occurs 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 a No. 1 ignition coil is struck or dropped, replace it with a new one.

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

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

  2. INSPECT IGNITION COIL AND SPARK TEST

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

      1. Check that the wire harness side connector of the No. 1 ignition coil is securely connected.

        Result

        Result

        Proceed to

        NG

        Connect securely

        OK

        Go to next step

      2. Perform a spark test on each No. 1 ignition coil.

        1. If there is a cylinder where sparks do not occur, replace its No. 1 ignition coil with the No. 1 ignition coil of a cylinder where sparks occur normally.

        2. Crank the engine and visually check that sparks occur at the cylinder with the normally operating No. 1 ignition coil.

          Result

          Result

          Proceed to

          OK

          Replace No. 1 ignition coil

          NG

          Go to next step

      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 a known good one.

          Result

          Result

          Proceed to

          OK

          Replace spark plug

          NG

          Inspect ignition system

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    2. Connect the 4 injector connectors.

    3. Install the No. 1 ignition coil and spark plug.

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    4. Install the No. 1 engine cover.

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    5. Clear the DTCs.

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    6. Check for DTCs.

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      Tip:

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

  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. I039522C06

      *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
        Tip:

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

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

    2. A126881

      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.

      4. 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 threads and insulator.

      If there is any damage, replace the spark plug.

      Recommended Spark Plug

      Manufacturer

      Spark Plug Type

      DENSO

      SC20HR11

      SC16HR11
    4. A126880C06

      *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.)

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

        Electrode Gap for a New Spark Plug

        1.0 to 1.1 mm (0.0394 to 0.0433 in.)

        Note:

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

    5. A296690

      Clean the spark plugs.

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

      Standard Air Pressure

      588 kPa (6 kgf/cm2, 85 psi)

      Standard Duration

      20 seconds or less

      Tip:

      Only use a 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.