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.
1998 Infiniti QX4FACTORY OEM SERVICE PROCEDURE
Ignition Coil Power Source
- Disconnect ignition coil 2-pin harness connector. Turn ignition on. Check for voltage at appropriate wire at ignition coil harness connector. See IGNITION COIL POWER SOURCE TERMINAL IDENTIFICATION table.
- If voltage is present, check ignition coil resistance. See appropriate IGNITION COIL RESISTANCE table. If voltage is not present, check continuity of entire circuit between battery and ignition coil, including fusible link and ignition switch. See POWER DISTRIBUTION section in SYSTEM WIRING DIAGRAMS article.
IGNITION COIL POWER SOURCE TERMINAL IDENTIFICATION
| Application | Wire Color | |
|---|---|---|
| Altima | Black/Red | |
| Frontier, Pathfinder & QX4 | Black/White | |
| Maxima | Red | |
| Quest | Brown | |
| Sentra & 200SX | ||
| 1.6L | Black/White | |
| 2.0L | Black/Red | |
| 240SX | Black/Red | |
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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