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On-Vehicle Inspection

  1. CHECK IGNITION COIL ASSEMBLY AND PERFORM SPARK TEST 
    1. Check for DTCs. Refer to 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. Refer to REMOVAL .
      2. Disconnect the 4 fuel injector connectors.
        Fig 1: Identifying Fuel Injector Connectors
        GTY230663Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Set the vehicle to the inspection mode. Refer to INSPECTION MODE PROCEDURE .
      4. Install the spark plug into the ignition coil, and then connect the ignition coil connector.
        Fig 2: IdentifyingIgnition Coil Connector
        GTY236661Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Ground the spark plug.
      6. Check that spark occurs while the engine is being cranked.

        HINT: 

        Repeat steps  4 to  6 for each spark plug and ignition coil.

        NOTE:
        • Ground the spark plugs when checking them.
        • Replace any ignition coils that have been subjected to a physical impact.
        • Do not crank the engine for more than 2 seconds.

        If spark does not occur, perform the following procedure for the malfunctioning cylinder.

    3. Perform the following spark test procedure.
      1. Check that the ignition coil connector is securely connected.

        Result

        Result Action
        NG Connect securely
        OK Go to next step
      2. Perform a spark test.
        1. Replace the ignition coil with a known good one.
        2. Set the vehicle to the inspection mode. Refer to INSPECTION MODE PROCEDURE .
        3. Perform the spark test again.

        Result

        Result Action
        NG Go to next step
        OK Replace ignition coil
      3. Perform a spark test.
        1. Replace the spark plug with a known good one.
        2. Set the vehicle to the inspection mode. Refer to INSPECTION MODE PROCEDURE .
        3. Perform the spark test again.

        Result

        Result Action
        NG Go to next step
        OK Replace the spark plug
      4. Check the power supply.
        Fig 3: Identifying Wire Harness Connector Terminals
        GTY213872Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        TEXT IN ILLUSTRATION

        *1 Front view of wire harness connector
        (to Ignition Coil)
        1. Turn the power switch on (IG).
        2. Measure the voltage according to the value(s) in the table below.

          Standard Voltage

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

          Result

          Result Action
          NG Check wiring between battery and ignition coil and check ground circuit
          OK Replace the ECM. Refer to COMPONENTS
      5. Connect the 4 fuel injector connectors.
        Fig 4: Identifying Fuel Injector Connectors
        GTY230663Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      6. Install the ignition coils and spark plugs. Refer to INSTALLATION .
  2. INSPECT SPARK PLUG 
    1. Check the electrode.
      Fig 5: Inspecting Spark Plug
      GTY214536Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

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

        Standard Resistance

        10 MΩ or more

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

        HINT: 

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

    2. Alternative inspection method:
      Fig 6: Identifying Spark Plug Condition
      GTY146371Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Quickly accelerate the engine to 4000 rpm 5 times.
      2. Remove each 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

      Manufacturer Spark Plug Type
      DENSO SC20HR11
    4. Check the spark plug electrode gap.
      Fig 7: Checking Spark Plug Electrode Gap
      GTY212235Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Spark Plug Electrode Gap

      Maximum Electrode Gap for Used Spark Plug

      Electrode Gap
      1.3 mm (0.0512 in.)

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

      Electrode Gap for New Spark Plug

      Electrode Gap
      1.0 to 1.1 mm (0.0394 to 0.0433 in.)
    5. Clean the spark plugs.
      Fig 8: Cleaning Electrode With Spark Plug Cleaner
      GTY122118Courtesy 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/cm2 , 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.

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