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.
2000 Infiniti QX4FACTORY OEM SERVICE PROCEDURE
Ignition Coil Power Source
- Disconnect ignition coil 2-pin harness connector. Turn ignition on. Measure voltage at appropriate wire at ignition coil harness connector. See IGNITION COIL POWER SOURCE TERMINAL IDENTIFICATION table.
- If battery voltage exists, check ignition coil resistance. See IGNITION COIL RESISTANCE . If battery voltage does not exist, check continuity of entire circuit between battery and ignition coil, including fusible link and ignition switch. See appropriate wiring diagram in WIRING DIAGRAMS article.
IGNITION COIL POWER SOURCE TERMINAL IDENTIFICATION
| Application | Wire Color |
|---|---|
| Altima | Black/Red |
| Frontier, Pathfinder & Xterra | Black/White |
| Maxima | Red |
| Quest | Brown |
| Sentra | Green/White |
Factory Service Tools
Use the Manual With the Right Hardware
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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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