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 Nissan-Datsun Sentra BaseFACTORY 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.
- 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, turn ignition off.
- Disconnect injector harness connector(s). Turn ignition on. Measure voltage between ground and injector harness connector Black/Red wires (White wire on 2.0L engine). Battery voltage should be present.
- If battery voltage is not present, check 30-amp fusible link and ignition switch. If fusible link and ignition switch are okay, repair or replace harness or connectors. If battery voltage is present, check fuel injector. See FUEL INJECTOR. If fuel injector is okay, check ECM terminals, harness and connector terminals for damage or corrosion. Repair or replace as necessary.
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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