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 Sentra SE-R, AutomaticFACTORY OEM SERVICE PROCEDURE
Condenser (Cooling) Fan Control Test
- Start engine and warm to operating temperature. Set temperature lever to full cold. Turn A/C switch on. Turn fan switch on. Run engine at idle with A/C on for several minutes. Ensure condenser fan operates. If fan does not operate, go to next step. If fan operates, system is functioning properly.
- Turn A/C and fan switches off. Turn ignition off. Disconnect condenser fan relay. See Figure and Figure . Turn ignition on. Measure voltage between ground and condenser fan relay harness connector terminals No. 2 (Blue/Orange wire) and No. 3 (Black/White wire). Battery voltage should be present. If battery voltage is present, go to step 4). If battery voltage is not present, go to next step.
- Check Gray and Green fusible links located in fuse and relay box next to battery. Replace fusible links as necessary. Check 10-amp fuse located in fuse box under left side of instrument panel. Replace fuse as necessary. If fusible links and 10-amp fuse are okay, repair open in harness or connectors.
- Turn ignition off. Disconnect condenser fan motor harness connector. Check continuity between condenser fan motor harness connector terminal "a" (Brown/White wire) and condenser fan relay harness connector terminal No. 5 (Brown/White wire). See Figure and Figure . Continuity should exist. If continuity exists, go to next step. If continuity does not exist, repair open in Brown/White wire.
- Check continuity between ground and condenser fan motor harness connector terminal "b" (Black wire). See Figure and Figure . Continuity should exist. If continuity exists, go to next step. If continuity does not exist, repair open in Black wire.
- Disconnect ECM harness connector. ECM is located behind passenger side kick panel. Check continuity between ECM harness connector terminal No. 9 (Orange/Blue wire) and condenser fan relay harness connector terminal No. 1 (Orange/Blue wire). See Figure and Figure . Continuity should exist. If continuity exists, go to next step. If continuity does not exist, repair open in Orange/Blue wire.
- Check condenser fan relay. See RELAYS under RELAYS & SOLENOIDS. Replace relay as necessary. If relay is okay, check condenser fan motor. See CONDENSER FAN MOTOR TEST. Replace fan motor as necessary. If fan motor is okay, inspect ECM and ECM harness connector terminals for damage, corrosion and improper connection. Repair 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.