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.
Ignition Coil With Power Transistor DISTRIBUTORLESS Ignition System
Turn ignition off. Disconnect suspect ignition coil 3-pin harness connector. Measure resistance between specified terminals. See CHECKING IGNITION COIL RESISTANCE (ALTIMA & SENTRA 2.5L) table, CHECKING IGNITION COIL RESISTANCE (MAXIMA, PATHFINDER) table or CHECKING IGNITION COIL RESISTANCE (SENTRA 1.8L) table. See Figure.
| Measure Between Terminals No. | Specification @ 77°F (25°C) |
|---|---|
| 1 & 2 | Except Zero Or Infinity |
| 1 & 3 | Except Zero |
| 2 & 3 | Except Zero |
| Measure Between Terminals No. | Specification @ 77°F (25°C) | Result |
|---|---|---|
| 2 & 3 | Zero | No Good |
| 2 & 3 | Not Zero | Good |
| Measure Between Terminals No. | Specification @ 77°F (25°C) |
|---|---|
| 1 & 3 | Except Zero Or Infinity |
| 1 & 2 | Except Zero |
| 2 & 3 | Except Zero |
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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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