Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU1991LOYALE 4D SEDAN, 1.8 5, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGIGNITION CHECKSIGNITION COIL RESISTANCE CHECKLEGACY
1991 Subaru Loyale 4D Sedan, 1.8 5, Standard
Ignition Coil Resistance Check: Legacy
1991 Subaru Loyale 4D Sedan, 1.8 5, StandardSECTION Legacy
- Disconnect 3-wire connector from ignition coil assembly. Using an ohmmeter, check resistance between terminals No. 1 and 2. See Fig 1 . This tests primary resistance of one coil.
- Check resistance between terminals No. 2 and 3. This tests primary resistance of other coil. If resistance is not approximately 0.7 ohm for each coil, replace ignition coil assembly.
- To test secondary resistance, connect one ohmmeter lead to secondary tower at one end of coil. Connect remaining ohmmeter lead to secondary tower at opposite end of same coil. Repeat test for other coil.
- If resistance of each coil is not approximately 13,800 ohms (Hitachi brand coil) or 21,000 ohms (Diamond brand coil), replace ignition coil assembly.
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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.
- • You are not confident in the next step or safety outcome.