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Home › Nissan-Datsun › 1995 › Altima GLE, RE4F04A › Repair and Diagnosis › Engine Performance › System › Engine Controls - System/Component Tests 2.4L › Miscellaneous Controls › Radiator (Cooling) Fan Control Test

Radiator (Cooling) Fan Control Test

WARNING: Be careful not to overheat engine during radiator fan control test.
  1. 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.
  2. Start engine and warm to operating temperature. Set temperature lever to full cold position. Turn A/C switch on. Turn blower fan on. Run engine at idle with A/C on for several minutes. Ensure radiator fan operates at low speed.
  3. Turn ignition (engine) 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 operates at high speed.
  4. If radiator fan operates as specified, cooling fan is functioning properly. If radiator fan does not operate as specified, see RADIATOR FAN MOTOR TEST or go to DTC 28 (P1900) diagnostic procedures in the TESTS W/CODES article.
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