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On-Vehicle Inspection

  1. CHECK IGNITION COIL ASSEMBLY AND PERFORM SPARK TEST 
    1. Check for DTCs (See DTC CHECK / CLEAR ).
      NOTE: If any DTC is present, perform troubleshooting in accordance with the procedure for that DTC.
    2. Check that spark occurs.
      1. Remove the ignition coils and spark plugs (See REMOVAL  ).
      2. Disconnect the 6 fuel injector connectors.
        Fig 1: Locating Fuel Injector Connectors
        G05999135Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Install the spark plug into the ignition coil, and then connect the ignition coil connector.
      4. Ground the spark plug.
      5. Check that spark occurs at each spark plug while the engine is being cranked.
        NOTE:
        • Be sure to ground the spark plugs when checking them.
        • If an ignition coil has been struck or dropped, replace it.
        • Do not crank the engine for more than 2 seconds.

        If spark does not occur, perform the following procedure.

        Fig 2: Grounding Spark Plug
        G05184017Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      6. Connect the 6 fuel injector connectors.
      7. Install the spark plugs and ignition coils (See INSTALLATION  ).
      8. Clear the DTCs (See DTC CHECK / CLEAR ).
    3. Perform the following spark test procedure.
      1. Check that the wire harness side connector of the ignition coil with igniter is securely connected.

        Result 

        RESULT REFERENCE

        Result Action
        NG Connect securely
        OK Go to next step
        Fig 3: Locating Fuel Injector Connectors
        G05999135Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Perform a spark test on each ignition coil.
        1. Replace the ignition coil with a known good one.
        2. Perform the spark test again.

          Result 

          RESULT REFERENCE

          Result Action
          NG Go to next step
          OK Replace Ignition coil
      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 REFERENCE

          Result Proceed to
          NG Go to next step
          OK Replace spark plug
      4. Check that power is supplied to the ignition coil.

        Text in Illustration 

        ILLUSTRATION LEGEND

        *1 Front view of wire harness connector (to Ignition Coil)
        1. Disconnect the ignition coil connector.
        2. Turn the ignition switch to ON.
        3. Measure the voltage according to the value(s) in the table below.

          Standard Voltage 

          TESTER CONNECTION SPECIFIED CONDITIONS CHART

          Tester Connection Specified Condition
          1 (+B) - 4 (GND) 11 to 14 V

          Result 

          RESULT REFERENCE

          Result Action
          NG Check wiring between Ignition switch and Ignition coil and check ground circuit
          OK Replace the ECM
          Fig 4: Measuring Voltage Between Fuel Injector Terminals
          G06023960Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK SPARK PLUG 
    1. Check the electrode using a megohmmeter.

      Text in Illustration 

      ILLUSTRATION LEGEND

      *1 Ground
      1. Using a megohmmeter, measure the insulation resistance.

        Standard Insulation 

        Resistance: 10 MΩ or more 

        If the result is below 10 MΩ, clean the plug and measure the resistance again.

        Fig 5: Checking Spark Plug Electrode Using Megohmmeter
        G06023394Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the electrode without using a megohmmeter.
      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 threads and insulator.

      If there is any damage, replace the spark plug.

      Recommended Spark Plug 

      SPARK PLUG SPECIFICATION

      Manufacturer Spark Plug Type
      DENSO FK20HR11
    4. Check the spark plug electrode gap.

      Maximum Electrode Gap for Used Spark Plug: 

      1.4 mm (0.0551 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 (0.0394 to 0.0433 in.) 

      Fig 6: Checking Spark Plug Electrode Gap
      G06023962Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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/cm 2  , 85 psi) 

      Standard Duration: 

      20 seconds or less 

      HINT:

      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.

      Fig 7: Cleaning Electrode With Spark Plug Cleaner
      G04943796Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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