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.
1993 Nissan-Datsun Maxima SE, Standard, RS5F50VFACTORY OEM SERVICE PROCEDURE
Air Regulator System Test (NX & SENTRA)
- Start engine and bring to operating temperature. Disconnect Auxiliary Air Control (AAC) valve harness connector. Pinch air regulator hose closed. Engine RPM should not drop. If RPM drops, go to next step. If RPM does not drop, system is functioning properly.
- Turn ignition off. Disconnect air regulator harness connector. Measure voltage between ground and air regulator harness connector Black/Red wire. Turn ignition on. Battery voltage should be present for 5 seconds after ignition is turned on. If voltage is as specified, go to next step. If voltage is not as specified, check continuity of Black/Red wire between air regulator harness connector and fuel pump relay. Repair or replace harness or connectors as necessary. If continuity is okay, check fuel pump relay. See RELAYS under RELAYS & SOLENOIDS.
- Turn ignition off. Check continuity between ground and air regulator harness connector Black wire. Continuity should exist. If continuity exists, check air regulator. See AIR REGULATOR TEST (EXCEPT ALTIMA & MAXIMA). If continuity does not exist, repair open in Black wire.
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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