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Ignition Coil Resistance

  1. Remove primary and secondary leads from ignition coil. Using ohmmeter, check primary resistance between positive and negative terminals of coil. See Fig 1 . Resistance should be as specified in the IGNITION COIL RESISTANCE  table. If resistance is not as specified, replace ignition coil.
  2. Check for proper secondary resistance between the coil towers of each ignition coil. See Fig 2 . Refer to specifications in the IGNITION COIL RESISTANCE  table. If resistance is not within specification, replace coil.
  3. Check insulation resistance of case. Using a 500-volt megger, measure insulation resistance between positive terminal and coil case. If resistance is not more than 10 megohms, replace ignition coil.
Fig 1: Checking Primary Coil Winding Resistance
G95D33459Courtesy of MAZDA MOTOR CORP.
Fig 2: Checking Secondary Coil Winding Resistance
G95C33466Courtesy of MAZDA MOTOR CORP.
IGNITION COIL RESISTANCE

Application Primary Secondary
MPV .72-.88 10,000-30,000
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