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.
1991 Jeep Cherokee LimitedFACTORY OEM SERVICE PROCEDURE
Ignition Coil Resistance Test
- Remove primary and secondary leads from ignition coil. Using ohmmeter, check primary resistance between positive and negative terminals of coil. See IGNITION COIL RESISTANCE SPECIFICATIONS table.
- Check secondary resistance between center tower and negative terminal of coil. See IGNITION COIL RESISTANCE SPECIFICATIONS table. Replace coil if readings are not within specification.
IGNITION COIL RESISTANCE SPECIFICATIONS
| Application | Ohms | ||
|---|---|---|---|
| 2.5L & 4.0L | |||
| Primary Resistance: 75°F (24°C) | .95-1.20 | ||
| Secondary Resistance: 75°F (24°C) | |||
| Diamond | 11,300-15,300 | ||
| Toyodenso | 11,300-13,300 | ||
| 5.9L | |||
| Primary Resistance | |||
| 75°F (24°C) | 1.13-1.23 | ||
| 200°F (93°C) | 1.5 | ||
| Secondary Resistance | |||
| 75°F (24°C) | 7700-9300 | ||
| 200°F (93°C) | 12,000 | ||
Factory Service Tools
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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.
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