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Ignition Coil Resistance

  1. Disconnect 3-wire connector from ignition coil assembly. Using an ohmmeter, check primary resistance between terminals No. 1 and 2 for one coil.
  2. Check primary resistance between terminals No. 2 and 3 for remaining coil. Resistance should be as specified. Refer to the IGNITION COIL RESISTANCE  table. If resistance is not as specified for each coil, replace ignition coil assembly.
  3. To test secondary resistance, connect one ohmmeter lead to tower at one end of coil. Connect remaining ohmmeter lead to tower at opposite end of same coil.
  4. Repeat test for other coils. If resistance of each coil is not as specified, replace ignition coil assembly.
IGNITION COIL RESISTANCE - OHMS @ 68°F (20°C)

Application Primary Secondary
Impreza (1) 0.40-1.00 (2) 18-24
(1) Checked between ignition coil primary terminals No. 1 and 2, and terminals No. 2 and 3.
(2) Checked between ignition coil secondary terminals No. 1 and 2, and terminals No. 3 and 4.
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