2006 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

Ignition System: 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. 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 an mega Ω meter, measure the insulation resistance.

        Insulation resistance: 10 MΩ or higher 

        If the resistance is less than the specified value, proceed to step ( d).

        HINT:

        If an ohmmeter is not available, perform the following simple inspection instead.

        Fig 1: Checking Electrode
        G02958785Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. 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 steps below.

      Fig 2: Alternative Inspection Method
      G02958786Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check the spark plug for any damage on its thread and insulator.

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

      Recommended spark plug: 

      SPARK PLUG SPECIFICATION

      DENSO made SK20R11
      NGK made IFR6A11
    4. 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: If 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.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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