IGNITION SYSTEM ON-VEHICLE INSPECTION

PROCEDURE

1. PERFORM IGNITION COIL AND SPARK TEST

   1. Check for DTCs (Click here).

      Note:

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

   2. Check whether sparks occur.

      1. Remove the 4 ignition coils and 4 spark plugs (Click here).

      2. 

         Disconnect the 4 injector connectors.

      3. 

         Install the spark plug onto each ignition coil and connect the ignition coil connectors.

      4. Ground the spark plug.

      5. Check that sparks occur while the engine is being cranked.

         Note:

         • Ground the spark plug when checking it.

         • Replace any ignition coils that have been subjected to any physical impact.

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

         If sparks do not occur, perform the following procedure.

   3. Perform the spark test in accordance with the following procedure.

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

         Table 1. Result

         Result	Proceed to
         NG	Connect securely
         OK	Go to next step

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

         1. Replace the ignition coil with igniter with a functioning one.

         2. Perform the spark test again.

         Table 2. Result

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

      3. Check the spark plug.

         Table 3. Result

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

      4. Check that power is supplied to the ignition coil with igniter.

         1. Turn the ignition switch to ON.

         2. Check that battery voltage is applied to the positive (+) terminal of the ignition coil.

         Table 4. Result

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

      5. Check the camshaft position sensor (Click here).

      6. Check the crankshaft position sensor (Click here).

      7. Check the IGT signal circuit (Click here).

   4. 

      Connect the 4 injector connectors.

   5. Install the 4 ignition coils and 4 spark plugs (Click here).

2. INSPECT SPARK PLUG

   Note:

   • Do not use a wire brush for cleaning.

   • Do not attempt to adjust the electrode gap of a used spark plug.

   1. 

      Check the electrode.

      1. Using a megohmmeter, measure the insulation resistance.

         Standard resistance

         10 MΩ or higher

         Table 5. Text in Illustration

         *1

         Ground

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

         Tip:

         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.

      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 thread and insulator.

      If there is any damage, replace the spark plug.

      Recommended Spark Plug

      Manufacturer	Product
      DENSO	SC16HR11

   4. Reference:

      1. 

         Check the spark plug electrode gap.

         Maximum electrode gap for used spark plug

         1.3 mm (0.0512 in.)

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

         Electrode gap for new spark plug

         1.0 to 1.1 mm (0.0394 to 0.0433 in.)

   5. Clean the spark plug.

      If the electrode has traces of wet carbon, clean the electrode with a spark plug cleaner, and then dry it.

      Air pressure

      588 kPa (6 kgf/cm², 85 psi)

      Duration

      20 seconds or less

      Tip:

      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.