Ignition Coil Resistance

1995 Toyota T100 DX, RWD, StandardSECTION Ignition Coil Resistance
  1. Remove necessary components and disconnect spark plug wire and electrical connector from ignition coil. Remove bolt and ignition coil from cylinder head. Mark ignition coil location for reassembly reference.
  2. Using ohmmeter, measure ignition coil primary resistance. See Fig 1. Replace ignition coil if primary resistance is not .67-1.0 5 ohms at 14-122°F (-10-50°C) and .85-1.23 ohms at 122-212°F (50-100°C).
  3. Using ohmmeter, measure ignition coil secondary resistance. See Fig 2. Replace ignition coil if secondary resistance is not 9300-16,000 ohms at 14-122°F (-10-50°C) and 11,700-18,800 ohms at 122-212°F (50-100°C). Reinstall ignition coil.
Fig 1: Measuring Ignition Coil Primary Resistance
G95C31361Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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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.
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