IGNITION SYSTEM ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

CAUTION:

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

B003PKE

PROCEDURE


  1. PERFORM SPARK TEST

    CAUTION:

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


    1. Check for DTCs.

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      Note

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

    2. Check if sparks occur.


      1. Remove the 6 ignition coil assemblies and 6 spark plugs.

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

      3. Disconnect the fuel pump relay.

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      4. Ground the spark plug.

      5. 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.

        • 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.

  2. INSPECT IGNITION COIL AND SPARK TEST


    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 a spark test on each ignition coil assembly.


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

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

    3. 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

    4. Check the power supply to the ignition coil assembly.


      1. Turn the ignition switch to ON.

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

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

    5. Check the VVT sensor.

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    6. Check the crankshaft position sensor.

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    7. Check the IGT signal circuit.

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

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    9. Connect the fuel pump relay.

    10. Clear the DTCs.

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  3. CHECK SPARK PLUG

    Tech Tips

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

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    1. B003R37C35
      *a Body Ground

      Check the electrode.


      1. 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 a megohmmeter is not available, perform the following simple inspection.

    2. Alternative inspection method:


      1. Start the engine.*

      2. Increase the engine speed to 4000 rpm and then let the engine speed decrease. Perform this operation 5 times.*

        Note

        *: Do not perform this step if P0300 (misfire detection) or a related DTC is stored.

      3. Remove the spark plug.

      4. 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 on its threads and insulator.

      If there is damage, replace the spark plug.

    4. B003NAM

      Clean the spark plugs.

    5. Check and adjust the electrode gap.

      Recommended Spark Plug and Electrode Gap
      Manufacturer Product Electrode gap for new spark plug Maximum electrode gap for used spark plug
      DENSO made K20HR-U11 1.0 to 1.1 mm (0.0394 to 0.0433 in.) 1.3 mm (0.0512 in.)
      NGK made LFR6C-11

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