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Ignition Coil Resistance

  1. Disconnect wiring from ignition coil so ignition coil is isolated from system. Using ohmmeter, check primary resistance between ignition coil positive (+) and negative (-) terminals. See Fig 1.
  2. Check secondary resistance between ignition coil positive (+) terminal and high tension wire terminal (coil wire tower). See Fig 2. Replace ignition coil if resistance is not within specification. See IGNITION COIL RESISTANCE  table.
IGNITION COIL RESISTANCE (V6) - Ohms @ 68°F (20°C)

Application Primary Secondary
T100 .36-.55 9000-15,400
Fig 1: Checking Ignition Coil Primary Resistance
G93A78907Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Checking Ignition Coil Secondary Resistance
G93D78918Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002