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.
1995 Nissan-Datsun Sentra BaseFACTORY OEM SERVICE PROCEDURE
Radiator (Cooling) Fan Control Test
WARNING:
Be careful not to overheat engine during radiator fan control test.
- A fault in radiator fan control circuit may set DTC 28 (P1900). To test system, see DTC 28 (P1900) diagnostic procedures in the TESTS W/CODES article. To test radiator fan, go to next step.
- Start engine and warm to operating temperature. Turn A/C switch on. Turn blower fan switch on. Ensure radiator fan comes on. Turn ignition (engine) off. Turn A/C switch and fan switch off. Disconnect engine coolant temperature sensor harness connector.
- Connect a 150-ohm resistor to engine coolant temperature sensor harness connector. Start engine and ensure radiator fan comes on. If radiator fan operates as specified, cooling fan is functioning properly. If radiator fan does not operate as specified, go to RADIATOR FAN MOTOR TEST and DTC 28 (P1900) diagnostic procedures in the TESTS W/CODES article.
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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