IGNITION SYSTEM ON-VEHICLE INSPECTION

PROCEDURE


  1. PERFORM SPARK TEST


    1. Check for DTCs.

      Note

      If any DTC is present, perform troubleshooting procedures for that DTC.

    2. Check if sparks occur.


      1. Remove the ignition coils Click here.

      2. Using a 16 mm plug wrench, remove the spark plugs.

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

      4. A001BBY

        Disconnect the 2 connectors.

      5. A001AHV

        Ground the spark plug.

      6. 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 engine 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 PLUG


    1. Spark test flowchart.


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

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

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


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

        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 engine switch on (IG).

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

        Result
        Result Proceed to
        NG Check wiring between engine switch and ignition coil with igniter
        OK Go to next step

      4. Inspect the spark plug.

        Result
        Result Proceed to
        NG Replace spark plug
        OK

        Inspect the ignition system Click here

        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.

    2. Using a 16 mm (0.63 in.) plug wrench, install the spark plug.

      Torque:
      21 N*m  { 214 kgf*cm, 15 ft.*lbf }
    3. A001BBY

      Connect the 2 connectors.

    4. Install the ignition coils Click here.

  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. A001FVLE86
      *1 Megohmmeter
      *2 Ground

      Check the electrode.


      1. Using a megohmmeter, measure the insulation resistance.

        Standard insulation resistance
        10 MΩ or more

        Tech Tips

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

    2. A001C5U

      Alternative inspection method:


      1. Start the engine.*

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

        Note

        *: Do not perform this step if P0300 (misfire detection) or a related DTC is stored.

      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 Product
      DENSO made SK20HR11
    4. A001COQE01
      *1 1.0 to 1.1 mm
      A001FGT

      Check the spark plug electrode gap.

      Maximum electrode gap for a used spark plug
      1.3 mm (0.051 in.)

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

      Electrode gap for a new spark plug
      1.0 to 1.1 mm (0.039 to 0.043 in.)

      Note

      If 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.

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

      Standard air pressure
      588 kPa (6 kgf/cm2, 85 psi)
      Standard 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.