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.
1997 Infiniti QX4FACTORY OEM SERVICE PROCEDURE
Fuel Injector Test
NOTE:
A fault in fuel injector circuit should set DTC P0170, DTC P0171, DTC P0172, DTC P0173, DTC P0174 or DTC P0175. To test system, see diagnostic procedures in appropriate TESTS W/CODES
article.
- Turn ignition off. Disconnect injector harness connectors. Turn ignition on. Measure voltage between ground and each injector harness connector White/Red wire. If battery voltage is not present, check Brown fusible link connected to positive battery post. If fusible link is okay, repair or replace harness or connectors.
- If battery voltage is present, check fuel injector. See FUEL INJECTOR. If injector is okay, check ECM terminals, harness, and connector terminals for damage or corrosion. Repair or replace as necessary.
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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