IGNITION COIL AND SPARK PLUG ON-VEHICLE INSPECTION


  1. INSPECT IGNITION COIL ASSEMBLY


    1. Check for DTCs.

      Note

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

    2. Remove the ignition coil assembly and spark plug Click here.

    3. Check that sparks occur.


      1. A017CER

        Disconnect the 6 fuel injector connectors.

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

      3. A017CXB

        Ground the spark plugs.

      4. Check if spark occurs at each spark plug while the engine is being cranked.

        Note


        • Be sure to ground the spark plugs during the inspection.

        • Replace the ignition coil if it receives an impact.

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

    4. Perform the spark test according to the flowchart below:


      1. Check that the ignition coil connector is securely connected.

        Result
        Result Action
        NG Connect securely
        OK Go to next step

      2. Perform a spark test on each ignition coil.


        1. Replace the ignition coil with a known good one.

        2. Perform the spark test again.

          Result
          Result Action
          NG Go to next step
          OK Replace ignition coil

      3. Check the spark plug (to INSPECT SPARK PLUG).

        Result
        Result Action
        NG Replace spark plug
        OK Go to next step

      4. Check the power supply to the ignition coil.


        1. Turn the ignition switch on (IG).

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

          Result
          Result Action
          NG Check wiring between ignition switch and ignition coil
          OK Go to next step

      5. Measure the resistance of the crankshaft position sensor Click here.

        Result
        Result Action
        NG Replace crankshaft position sensor
        OK Go to next step

      6. Check the IGT signal from the ECM Click here

        Result
        Result Action
        NG Check ECM
        OK Repair wiring between ignition coil and ECM

    5. Using a 16 mm plug wrench, install the spark plugs.

      Torque:
      18 N*m  { 183 kgf*cm, 13 ft.*lbf }

    6. Connect the 6 fuel injector connectors.

    7. Install the ignition coil assembly Click here.

  2. INSPECT SPARK PLUG

    Note


    • Never use a wire brush for cleaning.

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


    1. A017BLGE10

      Check the electrode.


      1. Using a megohmmeter, measure the insulation resistance.

        Standard insulation resistance
        10 MΩ or higher

        Tech Tips


        • If the result is below 10 MΩ, clean the plug and measure the resistance again.

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

    2. Alternative inspection method:


      1. Quickly accelerate the engine to 4000 rpm 5 times.

      2. Remove the spark plugs.

      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 threads and insulator. If there is damage, replace the spark plug.

      Recommended spark plug
      Manufacturer Spark Plug Type
      DENSO FK20HR11

      Note

      Use only the listed spark plug or equivalent to ensure engine performance and smooth driveability.

    4. A017CEDE01

      Check the spark plug electrode gap.

      Electrode gap for a new spark plug (for reference)
      1.0 to 1.1 mm (0.039 to 0.043 in.)
      Maximum electrode gap for a used spark plug
      1.4 mm (0.055 in.)

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

    5. A017FW9

      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

      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.

    6. Install the ignition coil assembly and spark plug. Click here.