IGNITION COIL AND SPARK PLUG ON-VEHICLE INSPECTION


  1. INSPECT IGNITION COIL ASSEMBLY


    1. Check for DTCs Click here.

      Note

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

    2. Check that spark occurs.


      1. Remove the 6 ignition coils and 6 spark plugs Click here.

      2. A017CER

        Disconnect the 6 fuel injector connectors.

      3. Install the spark plug into the ignition coil, and then connect the ignition coil connectors (step 3).

      4. A017CXB

        Ground the spark plug (step 4).

      5. Check that spark occurs while the engine is being cranked (step 5).

        Note


        • Be sure to ground the spark plugs when checking.

        • Replace the ignition coil if it receives an impact.

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

        Tech Tips


        • Repeat steps 3 - 5 for each spark plug and ignition coil.

        • If spark does not occur, perform the following procedure for the malfunctioning cylinder.

    3. Perform the following spark test procedure.


      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.


        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 the ignition coil

      3. Perform a spark test.


        1. Replace the spark plug with a known good one.

        2. Perform the spark test again.

          Result
          Result Action
          NG Go to next step
          OK Replace the spark plug
      4. A017BLME21
        Text in Illustration
        *1

        Front view of wire harness connector

        (to Ignition coil assembly)

        Check the power supply.


        1. Turn the ignition switch to ON.

        2. Measure the voltage according to the value(s) in the table below.

          Standard Voltage
          Tester Connection Condition Standard Voltage
          1 (+B) - 4 (GND) Ignition switch ON 11 to 14 V
          Result
          Result Action
          NG Check wiring between battery and ignition coil and check ground circuit
          OK

          Replace the ECM Click here

    4. Connect the 6 fuel injector connectors.

    5. Install the 6 ignition coils and 6 spark plugs Click here.

    6. Clear the DTCs 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 Click here.

      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 (0.0394 to 0.0433 in.)
      Maximum electrode gap for a used spark plug
      1.4 mm (0.0551 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.