2003 Nissan-Datsun Sentra SE-R, AutomaticFACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check Ground Connections 
    1. Turn ignition switch OFF.
    2. Loosen and retighten two ground screws. Refer to GROUND INSPECTION .
    1. OK or NG 
    2. OK: GO TO 2.
    3. NG: Repair or replace ground connections.
  2. Check Engine Coolant Temperature Sensor 

    Refer to COMPONENT INSPECTION .

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Replace engine coolant temperature sensor.
  3. Check Thermostat Operation 

    When the engine is under cold [lower than 70°C (158°F)] condition, grasp lower radiator hose and confirm the engine coolant does not flow.

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Repair or replace thermostat. Refer to THERMOSTAT AND WATER CONTROL VALVE .
  4. Check Intermittent Incident 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    1. : INSPECTION END 
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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.