2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan Quest. 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 three ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 1: Loosening & Retightening Ground Screws
      G02474149Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 2.
    • NG: Repair or replace ground connections.
  2. CHECK CONNECTOR 
    1. Disconnect EVAP control system pressure sensor harness connector.
      Fig 2: Disconnecting EVAP Control System Pressure Sensor Harness Connector
      G02474150Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Check sensor harness connector for water.
      • Water should not exist. 

    OK or NG

    • OK: GO TO 3.
    • NG: Repair or replace harness connector.
  3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch ON.
    2. Check voltage between EVAP control system pressure sensor terminal 3 and ground with CONSULT-II or tester.
      Fig 3: Checking Voltage Between EVAP Control System Pressure Sensor Terminal 3 & Ground
      G02474151Courtesy of NISSAN MOTOR CO., U.S.A.
      • Voltage: Approximately 5V 

    OK or NG

    • OK: GO TO  5.
    • NG: GO TO 4.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E19, F33
    • Harness connectors B106, E138
    • Harness for open or short between EVAP control system pressure sensor and ECM
    • : Repair open circuit or short to ground or short to power in harness or connectors.
  5. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Disconnect TCM harness connector.
    4. Check harness continuity between EVAP control system pressure sensor terminal 1 and ECM terminal 67, TCM terminal 42.

      Refer to WIRING DIAGRAM .

      • Continuity should exist. 
    5. Also check harness for short to ground and short to power.

    OK or NG

    • OK: GO TO  7.
    • NG: GO TO 6.
  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E19, F33
    • Harness connectors B106, E138
    • Harness for open or short between EVAP control system pressure sensor and ECM
    • Harness for open or short between EVAP control system pressure sensor and TCM
    • : Repair open circuit or short to ground or short to power in harness or connectors.
  7. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check harness continuity between ECM terminal 32 and EVAP control system pressure sensor terminal 2.

      Refer to WIRING DIAGRAM .

      • Continuity should exist. 
    2. Also check harness for short to ground and short to power.

    OK or NG

    • OK: GO TO  9.
    • NG: GO TO 8.
  8. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E19, F33
    • Harness connectors B106, E138
    • Harness for open or short between EVAP control system pressure sensor and ECM
    • : Repair open circuit or short to ground or short to power in harness or connectors.
  9. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG

    • OK: GO TO 10.
    • NG: Replace EVAP control system pressure sensor.
  10. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    • : 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.