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
Fuel Injector Test: Maxima
- With engine running, listen for clicking sound at each injector. If clicking sound is present at each injector, system is functioning properly. If clicking sound is not present, go to next step.
- Turn ignition off. To test left bank injectors, disconnect injector harness connector(s). To test right bank injectors, disconnect injector sub-harness connector. See Fig 1. Turn ignition on. On left bank injectors, measure voltage between ground and injector harness connector Red wire(s). On right bank injectors, measure voltage between injector sub-harness connector terminal No. 5. See Fig 2. Battery voltage should be present. If battery voltage is present, go to next step. If battery voltage is not present, check fusible link, ignition switch, and open or short in Red wire between ignition switch and injector(s) harness connector or sub-harness connector. Repair or replace as necessary. See WIRING DIAGRAMS article.
- Turn ignition off. Disconnect PCM harness connector. Check continuity between specified PCM harness connector terminal and appropriate injector harness or sub-harness connector terminal. See INJECTOR CIRCUIT IDENTIFICATION (MAXIMA) table. If continuity exists in each circuit, go to next step. If continuity does not exist in any circuit, repair open or short in appropriate wire between PCM and injector harness or sub-harness connectors.
- Remove intake manifold collector from intake manifold. On right bank injectors, check continuity between injector sub-harness connector terminal No. 5 and each injector harness connector terminal No. 2 (Red wire). Also check continuity between injector harness connector terminal No. 1 and appropriate injector sub-harness connector terminal. See INJECTOR CIRCUIT IDENTIFICATION (MAXIMA) table. If continuity exists on each circuit, go to next step. If continuity does not exist on any circuit, repair open or short in appropriate wire.
- Check fuel injector(s). See FUEL INJECTOR . If fuel injectors are okay, check PCM harness connector terminals for damage or corrosion. Repair or replace as necessary.
INJECTOR CIRCUIT IDENTIFICATION (MAXIMA)
| Application | PCM Terminal No. (1) | Wire Color | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Injector No. 1 (2) | 102 | Red/Black | ||||||||
| Injector No. 2 | 107 | Red/Green | ||||||||
| Injector No. 3 (3) | 104 | Red/Yellow | ||||||||
| Injector No. 4 | 109 | Black/Orange | ||||||||
| Injector No. 5 (4) | 111 | Blue/White | ||||||||
| Injector No. 6 | 114 | Purple/Red | ||||||||
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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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