2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. CHECK CRANKSHAFT POSITION SENSOR (POS) 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    1. OK: GO TO 2.
    2. NG: Replace crankshaft position sensor (POS).
  2. CHECK CAMSHAFT POSITION SENSOR (PHASE) 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Replace camshaft position sensor (PHASE).
  3. CHECK CAMSHAFT (INTAKE) 

    Check the following.

    • Accumulation of debris to the signal plate of camshaft rear end
    • Chipping signal plate of camshaft rear end

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Remove debris and clean the signal plate of camshaft rear end or replace camshaft.
      Fig 1: Checking Camshaft (Intake)
      G00776892Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    For wiring diagram refer to "WIRING DIAGRAM " for CKP sensor (POS) and "WIRING DIAGRAM " for CMP sensor (PHASE).

    1. INSPECTION END 
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.