LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2017 >> ES 300h >> Repair and Diagnosis >> Engine Performance >> Ignition System (Inspection) >> Ignition System >> On-Vehicle Inspection [07/2015 - ] >> Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

On-Vehicle Inspection [07/2015 - ]: Procedure

  1. PERFORM SPARK TEST 
    1. Check for DTCs. Refer to DTC CHECK / CLEAR [07/2015 - ]
      NOTE:

      If any DTC is output, perform troubleshooting procedure for that DTC.

    2. Remove the 4 ignition coil assemblies and 4 spark plugs. Refer to REMOVAL [07/2015 - ]
    3. Disconnect the 4 fuel injector connectors.
      GTY316087Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Install the spark plug into the ignition coil assembly, and then connect the ignition coil assembly connector.
    5. Ground the spark plug.
      GTY322170Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. 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.
      • Do not crank the engine for more than 2 seconds.

        Cranking will stop if the power switch is pushed again for models with cranking holding function.

      • If a spark plug has been struck or dropped, replace it.
      • If an ignition coil assembly has been struck or dropped, replace it.

      HINT: 

      If spark does not occur, perform the following procedure.

    7. Connect the 4 fuel injector connectors.
      GTY316087Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Install the 4 spark plugs and 4 ignition coil assemblies. Refer to INSTALLATION [07/2015 - ]
    9. Check for DTCs. Refer to DTC CHECK / CLEAR [07/2015 - ]
    10. Clear the DTCs. Refer to DTC CHECK / CLEAR [07/2015 - ]
  2. INSPECT IGNITION COIL AND SPARK TEST 

    HINT: 

    Perform "Inspection After Repair" after replacing a spark plug or ignition coil assembly. Refer to INITIALIZATION [07/2015 - ]

    1. Check that the wire harness side connector of the ignition coil assembly is securely connected.
      RESULT

      Result Proceed to
      NG Connect securely
      OK Proceed to next step
    2. Perform a spark test on each ignition coil assembly.
      1. Replace the ignition coil assembly with a known good one.
      2. Perform the spark test again.
        RESULT

        Result Proceed to
        NG Proceed to next step
        OK Replace ignition coil assembly
    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 Proceed to
        NG Inspect the ignition system. Refer to DTC P0351: Ignition Coil "A" Primary / Secondary Circuit; DTC P0352: Ignition Coil "B" Primary / Secondary Circuit; DTC P0353: Ignition Coil "C" Primary / Secondary Circuit; DTC P0354: Ignition Coil "D" Primary / Secondary Circuit [07/2015 - ]
        OK Replace spark plug
  3. CHECK SPARK PLUG 
    NOTE:
    • Do not use a wire brush for cleaning.
    • Do not adjust the electrode gap of a used spark plug.

    HINT: 

    Perform "Inspection After Repair" after replacing a spark plug. Refer to INITIALIZATION [07/2015 - ]

    1. Check the electrode using a megohmmeter:
      GTY526266Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Ground
      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

        HINT: 

        • If the result is not as specified, clean the spark plug with a spark plug cleaner and measure the resistance again.
        • If a megohmmeter is not available, perform the following alternative inspection instead.
    2. Alternative inspection method:
      GTY146371Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Quickly accelerate the engine to 4000 rpm 5 times.
      2. Remove the spark plug. Refer to REMOVAL [07/2015 - ]
      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 Product
      DENSO FK16HR-A8
    4. Reference:
      1. Check the spark plug electrode gap.
        GTY315757Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Maximum electrode gap for a used spark plug

        1.1 mm (0.0433 in.)

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

        NOTE:

        Never attempt to adjust the gap of a used plug.

        Electrode gap for a new spark plug

        0.7 to 0.8 mm (0.0276 to 0.0315 in.)

        TEXT IN ILLUSTRATION

        *a Spark plug electrode gap
    5. Clean the spark plugs.
      GTY533557Courtesy 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 a 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.

    6. Install the spark plug. Refer to INSTALLATION [07/2015 - ]
scientia non olet · About LEMON Manuals