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
Fuel Injector Circuits (Quest)
- Start engine. If engine does not start, go to next step. If engine starts, listen to each injector. If every injector clicks, system is okay. If any injector does not click, go to next step.
- Turn ignition off. Disconnect inoperative injector harness connector. Turn ignition on. Measure voltage between ground and appropriate injector harness connector Yellow wire. If battery voltage exists, go to next step. If battery voltage does not exist, repair open or short circuit. See appropriate wiring diagram in WIRING DIAGRAMS article.
- Turn ignition off. Disconnect PCM harness connector. Check continuity of specified wire between PCM harness connector and appropriate injector harness connector. See FUEL INJECTOR CIRCUIT IDENTIFICATION (QUEST) table. See Figure. If continuity exists, go to next step. If continuity does not exist, repair open in appropriate wire.
- Check fuel injector. See FUEL INJECTOR . Replace, if necessary. If injector is okay, no problem is indicated at this time. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
FUEL INJECTOR CIRCUIT IDENTIFICATION (QUEST)
| Injector No. | PCM Terminal No. (1) | Wire Color | ||
|---|---|---|---|---|
| 1 | 102 | Green/Orange | ||
| 2 | 109 | Green | ||
| 3 | 104 | Green/Red | ||
| 4 | 111 | Yellow/Purple | ||
| 5 | 106 | Yellow/Green | ||
| 6 | 113 | Gray/Blue | ||
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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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