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Home >> Nissan-Datsun >> 2006 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing (Qr25DE) >> Fuel Injector >> Diagnostic Procedure
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Diagnostic Procedure

  1. INSPECTION START 

    Turn ignition switch to START.

    Is any cylinder ignited? 

    Yes or No 

    Yes: GO TO  2.

    No: GO TO  3.

  2. CHECK OVERALL FUNCTION 

    With CONSULT-II 

    1. Start engine.
    2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-II.
    3. Make sure that each circuit produces a momentary engine speed drop.
    Fig 1: Consult-II ACTIVE TEST Display Screen
    G04080452Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

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

      Clicking noise should be heard. 

    Fig 2: Checking Fuel Injector For Audible Clicking
    G04132840Courtesy 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.
    3. Turn ignition switch ON.
      Fig 3: Disconnecting Fuel Injector Harness Connector
      G04192260Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between fuel injector terminal 1 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

      5. Fig 4: Checking Voltage Between Fuel Injector Terminal 1 And Ground
      G04192261Courtesy 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 M19, E108
    • Harness connectors E10, F48
    • Harness connectors F12, F101
    • Fuse block (J/B) connector M1
    • 10A 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 22, 23, 41, 42. 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  7.

    NG: GO TO  6.

  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F12, F101
    • Harness for open or short between fuel injector and ECM

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

  7. CHECK FUEL INJECTOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO  8.

    NG: Replace fuel injector.

  8. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    : INSPECTION END 

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