IGNITION SYSTEM ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

Tech Tips

Perform "Inspection After Repair" after replacing an ignition coil assembly or spark plug Click here.

PROCEDURE


  1. PERFORM SPARK TEST


    1. Check for DTCs Click here.

      Note

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

    2. Remove the 4 ignition coil assemblies and 4 spark plugs Click here.

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

    4. Disconnect the 4 fuel injector connectors.

    5. 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.

      • Be sure to ground the spark plug when checking.

      • 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.

    7. If sparks do not occur normally in 1 or more cylinders, perform the "Ignition Coil and Spark Test" below.

  2. INSPECT IGNITION COIL AND SPARK TEST

    Tech Tips

    Perform "Inspection After Repair" after replacing an ignition coil assembly or spark plug Click here.


    1. Spark test flowchart.


      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 spark test on each ignition coil assembly.


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

        2. Perform 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 Click here

      4. Check the camshaft position sensor Click here.

      5. Check the crankshaft position sensor Click here.

    2. Connect the 4 fuel injector connectors.

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

    4. Clear DTCs 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.

    Tech Tips

    Perform "Inspection After Repair" after replacing an ignition coil assembly or spark plug Click here.


    1. Check the electrode.


      1. B001G2UE06
        Text in Illustration
        *a Ground

        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.

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

      Recommended Spark Plug
      Manufacturer Spark Plug Type
      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. B001GYI

      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 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.