IGNITION SYSTEM ON-VEHICLE INSPECTION

Note

In this section, the terms "cold" and "hot" refer to the temperature of the coils. "Cold" means approximately -10 to 50°C (14 to 122°F). "Hot" means approximately 50 to 100°C (122 to 212°F).


  1. PERFORM SPARK TEST


    1. Check for DTCs.

      Note

      If a DTC is present, perform troubleshooting procedures for that DTC.

    2. Check if sparks occur.


      1. Remove the ignition coil.

      2. Remove the spark plug.

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

      4. Disconnect the 4 injector connectors.

      5. Ground the spark plug.

      6. Visually check that sparks occur while the engine is being cranked.

        Note


        • Be sure to ground the spark plug when checking.

        • If the ignition coil has been struck or dropped, replace it.

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

    3. Spark test flow chart.


      1. Check that the wire harness side connector of the ignition coil with igniter is securely connected.

        Result
        Result Proceed to
        NG Connect securely
        OK Go to next step

      2. Perform spark test on each ignition coil with igniter.


        • 1. Replace ignition coil with igniter with a normal one.

        • 2. Perform spark test again.

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

      3. Check power supply to ignition coil with igniter.


        • 1. Turn the ignition switch ON.

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

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

      4. Check resistance of camshaft position sensor.

        Standard resistance
        Temperature Specified Condition
        Cold 835 to 1,400 Ω
        Hot 1,060 to 1,645 Ω
        Result
        Result Proceed to
        NG Replace camshaft position sensor
        OK Go to next step

      5. Check resistance of crankshaft position sensor.

        Standard resistance
        Temperature Specified Condition
        Cold 1,630 to 2,740Ω
        Hot 2,065 to 3,225Ω
        Result
        Result Proceed to
        NG Replace crankshaft position sensor.
        OK Go to next step

      6. Check IGT signal from ECM.

        Result
        Result Proceed to
        NG Check ECM
        OK Repair wiring between ignition coil and ECM

    4. Using a 16 mm plug wrench, install the spark plug.

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

    5. Install the ignition coil.

      Torque:
      9.0 N*m  { 92 kgf*cm, 80 in.*lbf }

  2. CHECK SPARK PLUG


    1. A01J5NHE10

      Check the electrode.


      1. Using a megohmmeter, measure the insulation resistance.

        Standard insulation resistance
        10 MΩ or more

        Tech Tips

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

    2. A01J63UE01

      Alternative inspection method:


      1. Quickly accelerate the engine to 4,000 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 on its thread and insulator.

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

      Recommended spark plug
      Manufacturer Product
      DENSO K20HR-U11
    4. A01J4YBE03

      Check the spark plug electrode gap.

      Maximum electrode gap for used spark plug
      1.3 mm (0.051 in.)

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

      Electrode gap for new spark plug
      1.0 to 1.1 mm (0.039 to 0.043 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. A01J2YJE01

      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.