IGNITION SYSTEM ON-VEHICLE INSPECTION


  1. PERFORM SPARK TEST


    1. Check for DTCs Click here.

      Note

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

    2. Check if sparks occur.


      1. Remove the ignition coils and spark plugs Click here.

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

      3. Disconnect the 8 injector connectors.

      4. A01EPJA

        Ground the spark plug.

      5. Visually check that sparks occur while the engine is being cranked.

        Note


        • Be sure to ground the spark plug when checking.

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

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

    3. 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
    4. 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
    5. Check spark plug.

      Result
      Result Proceed to
      NG Replace spark plug
      OK Go to next step
    6. 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
    7. Check the VVT sensor for intake side Click here.

    8. Check the VVT sensor for exhaust side Click here.

    9. Check the camshaft position sensor Click here.

    10. Check the crankshaft position sensor Click here.

    11. Check the IGT signal circuit Click here.

    12. Connect the 8 injector connectors.

    13. Install the ignition coils and spark plugs Click here.

  2. 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. Check the electrode.


      1. A01EQLIE07

        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

        If the insulation resistance is below the specified range, replace the spark plug.

        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. A01ES9W

        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. A01EQTCE01

      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 Type
      DENSO made SK20HR11

      Tech Tips

      A01EPD3E02

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

      If the gap is more 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 it with a spark plug cleaner.

      Standard air pressure
      588 kPa (6.0 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.