Ignition Coil Resistance

Disconnect 3-wire connector from ignition coil assembly. Using an ohmmeter, check primary resistance between terminals No. 1 and 2 for one coil. See Fig 1.
Check primary resistance between terminals No. 2 and 3 for remaining coil. Resistance should be as specified. See IGNITION COIL RESISTANCE table. If resistance is not as specified for each coil, replace ignition coil assembly.
To test secondary resistance, connect ohmmeter between ignition coil secondary terminals No. 1 and 2, and terminals No. 3 and 4.
Repeat test for other coils. If resistance of each coil is not as specified, replace ignition coil assembly.

Fig 1: Identifying Ignition Coil Connector Terminals

Courtesy of SUBARU OF AMERICA, INC.

IGNITION COIL RESISTANCE - OHMS @ 68°F (20°C)

Application

⁽¹⁾ Primary

⁽²⁾ Secondary

Forester & Impreza

.62-.76

17,850-24,150

Legacy

2.2L

.66-.80

10,880-14,720

2.5L

.40-1.00

18,000-24,000

⁽¹⁾	Checked between ignition coil primary terminals No. 1 and No. 2, and terminals No. 2 and No. 3. See Fig 1.

⁽²⁾	Check between ignition coil secondary terminals No. 1 and No. 2, and terminals No. 3 and No. 4. See Fig 1.