IGNITION SYSTEM ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

Tech Tips

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

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PROCEDURE


  1. PERFORM SPARK TEST

    CAUTION:

    To prevent injury due to contact with an operating V-ribbed belt or cooling fan, keep your hands and clothing away from the V-ribbed belt and cooling fans when working in the engine compartment with the engine running or the engine switch on (IG).

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    Tech Tips

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

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    1. Check for DTCs.

      Note

      If any DTCs are output, perform troubleshooting in accordance with the procedure for each DTC.

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    2. Check if sparks occur.


      1. Remove the 6 spark plugs.

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

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        Disconnect the 4 connectors.

      4. 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.

        • Replace the ignition coil assembly if it receives an impact.

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

    3. Check that the wire harness side connector of the ignition coil assembly 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 assembly with igniter.


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

        Result
        Result Proceed to
        OK Replace ignition coil assembly with igniter
        NG Go to next step

    5. Inspect the spark plug.


      1. Replace the spark plug with a normal one.

      2. Perform spark test again.

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

    6. Check power supply to the ignition coil assembly 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 assembly with igniter
        OK Go to next step

  2. INSPECT IGNITION COIL ASSEMBLY AND SPARK TEST

    Tech Tips

    Perform "Inspection After Repair" after replacing a spark plug or ignition coil assembly.

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

      Result
      Result Action
      NG Connect securely
      OK Go to next step

    2. Perform a spark test on each ignition coil assembly.


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

      2. Perform the spark test again.

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

    3. Perform a spark test on each spark plug.


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

      2. Perform the spark test again.

        Result
        Result Action
        NG

        Inspect the ignition system

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        OK Replace spark plug

        Note

        If an ignition coil assembly or spark plug has been struck or dropped, replace it.

    4. Connect the 4 connectors.

    5. Install the 6 spark plugs and 6 ignition coil assemblies.

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    6. Check for DTCs.

    7. Clear the DTCs.

  3. INSPECT SPARK PLUG

    Tech Tips

    Perform "Inspection After Repair" after replacing a spark plug.

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    1. Check the electrode using a megohmmeter:


      1. B006GBJC41
        *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 the result is not as specified, clean the spark plug with a spark plug cleaner and measure the resistance again.

        • 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.

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      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 any damage, replace the spark plug.

      Recommended Spark Plug
      Manufacturer Spark Plug Type
      DENSO FK20HBR8

    4. Check the spark plug electrode gap.

      Maximum Electrode Gap for Used Spark Plug
      1.1 mm (0.0433 in.)

      Note

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

      If the electrode gap is more than the maximum, replace the spark plug.

      Standard Electrode Gap for New Spark Plug
      0.7 to 0.8 mm (0.0276 to 0.0315 in.)

    5. 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 (6.0 kgf/cm2, 85 psi)
      Standard 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.

    6. Install the spark plug.

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