2011 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Diagnosis Procedure

  1. INSPECTION START

    Turn ignition switch to START.

    Is any cylinder ignited? 

    Yes or No 

    Yes: GO TO 2.

    No: GO TO  2.

  2. CHECK OVERALL FUNCTION

    With CONSULT-III 

    1. Start engine.
    2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-III.
    3. Check that each circuit produces a momentary engine speed drop.

    Without CONSULT-III 

    1. Start engine.
    2. Listen to each fuel injector operating sound.

      Clicking noise should be heard  .

      Fig 1: Checking Fuel Injector Operating Sound
      G07144479Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK: INSPECTION END 

      NG: GO TO 3.

  3. CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect fuel injector harness connector (1).
      • : Vehicle front
      Fig 2: Location Of Fuel Injector Harness Connector
      G07144480Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Turn ignition switch ON.
    4. Check voltage between fuel injector terminal 1 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

      Fig 3: Checking Voltage Between Fuel Injector Terminal 1 And Ground
      G07144481Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK: GO TO  5.

      NG: GO TO 4.

  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E3, F2
    • 10 A fuse
    • Harness for open or short between fuel injector and fuse

    Repair open circuit or short to ground or short to power in harness or connectors.

  5. CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between fuel injector terminal 2 and ECM terminals 29, 30, 31, 32.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

    4. Also check harness for short to ground and short to power.

      OK or NG 

      OK: GO TO 6.

      NG: Repair open circuit or short to ground or short to power in harness or connectors.

  6. CHECK FUEL INJECTOR

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 7.

    NG: Replace malfunctioning fuel injector. Refer to "REMOVAL AND INSTALLATION ".

  7. CHECK INTERMITTENT INCIDENT

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    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.

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