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GS300 & SC300

  1. Remove ignition coil. See IGNITION SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article.
  2. Using ohmmeter, check ignition coil primary resistance between positive (+) and negative (-) electrical terminals on ignition coil. See Fig 1. Replace ignition coil if ignition coil primary resistance is not within specification. See IGNITION COIL RESISTANCE (OHMS)  table.
  3. Using ohmmeter, check ignition coil secondary resistance between electrical terminal and spark plug terminal on ignition coil. See Fig 2. Replace ignition coil if ignition coil secondary resistance is not within specification. See IGNITION COIL RESISTANCE (OHMS)  table. Reinstall ignition coil.
    IGNITION COIL RESISTANCE (OHMS)

    Application Primary Secondary
    GS300 & SC300
    Cold (1) .33-.52 8500-14,700
    Hot (2) .42-.61 10,800-17,200
    (1) Cold is with temperature of 14-122°F (-10-50°C).
    (2) Hot is with temperature of 122-212°F (51-100°C).
    Fig 1: Checking Ignition Coil Primary Resistance (GS300 & SC300)
    G98C11231Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 2: Checking Ignition Coil Secondary Resistance (GS300 & SC300)
    G98D11232Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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