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.

2002 Jeep Wrangler SE, AutomaticFACTORY OEM SERVICE PROCEDURE

Ignition Coil

IGNITION COIL RESISTANCE - Ohms @ 70-80°F (21-27°C)

Application

Primary

Secondary

2.4L

.51-.61

11,500-13,500

2.5L

Diamond Coil

.97-1.18

11,300-15,300

Toyodenso Coil

.95-1.20

11,300-13,300

3.7L

.6-.9

6000-9000

4.0L

.71-.88

⁽¹⁾

4.7L

.6-.9

6000-9000

⁽¹⁾	Secondary resistance cannot be checked using an ohmmeter.

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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